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Niederleithner M, de Sisternes L, Stino H, Sedova A, Schlegl T, Bagherinia H, Britten A, Matten P, Schmidt-Erfurth U, Pollreisz A, Drexler W, Leitgeb RA, Schmoll T. Ultra-Widefield OCT Angiography. IEEE Trans Med Imaging 2023; 42:1009-1020. [PMID: 36383595 DOI: 10.1109/tmi.2022.3222638] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Optical Coherence Tomography Angiography (OCTA), a functional extension of OCT, has the potential to replace most invasive fluorescein angiography (FA) exams in ophthalmology. So far, OCTA's field of view is however still lacking behind fluorescence fundus photography techniques. This is problematic, because many retinal diseases manifest at an early stage by changes of the peripheral retinal capillary network. It is therefore desirable to expand OCTA's field of view to match that of ultra-widefield fundus cameras. We present a custom developed clinical high-speed swept-source OCT (SS-OCT) system operating at an acquisition rate 8-16 times faster than today's state-of-the-art commercially available OCTA devices. Its speed allows us to capture ultra-wide fields of view of up to 90 degrees with an unprecedented sampling density and hence extraordinary resolution by merging two single shot scans with 60 degrees in diameter. To further enhance the visual appearance of the angiograms, we developed for the first time a three-dimensional deep learning based algorithm for denoising volumetric OCTA data sets. We showcase its imaging performance and clinical usability by presenting images of patients suffering from diabetic retinopathy.
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Théra JP, Tiama JM, Konipo A, Napo A, Bamani S. [Treatment of congenital ptosis in a low-income country: polypropylene frontalis sling at the African Institute of Tropical Ophthalmology]. J Fr Ophtalmol 2019; 43:123-127. [PMID: 31858999 DOI: 10.1016/j.jfo.2019.07.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 04/29/2019] [Accepted: 07/11/2019] [Indexed: 11/17/2022]
Abstract
INTRODUCTION Treatment of congenital ptosis is exclusively surgical; the frontalis sling method is most appropriate when the ptosis is severe, with no upper eyelid levator function. This surgery typically utilizes various materials (autologous fascia lata, silicone, nylon, or polypropylene bands, etc.). MATERIALS AND METHODS This was a retrospective descriptive study of 22 children under 16 years of age, treated for congenital ptosis by frontalis suspension of the levator muscle of the upper eyelid using the polypropylene technique, between January 1, 2014 and June 30, 2017 at the African Institute of Tropical Ophthalmology teaching hospital. RESULTS In our study, the surgical result (prior to correction of recurrences) was satisfactory in 81.82 % of cases, with a recurrence rate of 13.64 %. The mean follow-up was 14 months, ranging from 4 to 25 months. DISCUSSION The use of polypropylene provides encouraging results in ptosis surgery, while also offering the advantage of being low cost and more available. Its use in developing countries deserves special attention.
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Affiliation(s)
- J P Théra
- Ophtalmo-pédiatre, à l'institut d'ophtalmologie tropicale de l'Afrique IOTA, 248, Bamako, Mali.
| | - J M Tiama
- DES d'ophtalmologie à l'institut d'ophtalmologie tropicale de l'Afrique IOTA, 248, Bamako, Mali
| | - A Konipo
- Ophtalmologiste au CSREF de Koulikoro, Mali
| | - A Napo
- Ophtalmologiste à l'institut d'ophtalmologie tropicale de l'Afrique IOTA, 248, Bamako, Mali
| | - S Bamani
- Ophtalmologiste à l'institut d'ophtalmologie tropicale de l'Afrique IOTA, 248, Bamako, Mali
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Abstract
Current soft surface electrodes have attracted more and more attentions owing to their potential applications in biological signal monitoring, human-machine interaction (HMI) and Internet of Things (IoT). The paper presents that soft dry electrode based on polydimethylsiloxane-carbon black (PDMS-CB) conductive polymer is designed and fabricated to continuous, long-term, stable electroophthalmogram (EOG) signal recordings for HMI applications. The features corresponding to the different eye motions are extracted from the EOG data via the soft dry electrodes. Linear discriminant analysis (LDA) recognition algorithms are proposed to recognize eye motion behaviors for controlling the motion of the mobile robots. Experiment results have been demonstrated that LDA recognition algorithm achieves a relatively high recognition accuracy of 90.63% for recognizing four eye movements ('Up', 'Down', 'Right', and 'Left'). The control commands are generated with different eye motions and transmitted to the mobile robot through WiFi communication unit, which the mobile robot is successfully controlled. The soft dry electrodes have the potential in a comfortable, simple, wearable and wireless control of rehabilitation devices.
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Affiliation(s)
- Xiao Cheng
- Rail Transportation Technology Innovation Center, East China Jiaotong University, Nanchang, 330013, China
| | - Chongzhi Bao
- School of Computer Science and Information Security, Guilin University of Electronic Technology, Guilin, 541004, China
| | - Wentao Dong
- Rail Transportation Technology Innovation Center, East China Jiaotong University, Nanchang, 330013, China.
- School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang, 330013, China.
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Chiou PY, Chien CY, Lai YH, Chun CF. The effect evaluation of advanced penlight. PLoS One 2018; 13:e0205978. [PMID: 30403695 PMCID: PMC6221280 DOI: 10.1371/journal.pone.0205978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Accepted: 10/04/2018] [Indexed: 12/02/2022] Open
Abstract
Pupil diameter measurement is crucial for physical assessment and disease monitoring in a health and nursing care situation. A general penlights (GPLs) is frequently used and allow for an approximate and indirect measurement of the pupil diameter. Health caregivers or nurses generally have less confidence in the value of the pupil diameter measured using the GPL. The Advanced Penlight (APL) is a new device designed for accurate measurement of the pupil diameter. The purpose of the presented research was to compare the accuracies and operational times of the pupil diameter measurements by means of the GPL and APL. One-group post-test and single-blind study designed was used in this study. The innovation of the APL is the addition of a perspective measurement ruler (PMR) attached to one side of the penlight that allows precise measurement of the pupil diameter before and after pupillary contraction. The PMR can be rotated by any angle for adaptation to the measurement conditions. After standard pupil diameter measurements by a refractometer (RM) were performed on a subjects, ninety study participants measured the pupil diameters of the same subject separately by the GPL and APL. A self-administered questionnaire was used to assess the opinions of the participants after using the GPL compare to the APL. The mean age of the participants was 20.01 (SD = 0.47) years and 83% of them were female senior nursing students. There were no statistically significant differences between the average values of pupil diameters measured by the APL and the RM. Compared to the GPL, the pupil diameter measured by APL was much similar to the RM measurement. The average operational time was 8.72 seconds shorter (t = -3.81, p = 0.001) for the APL measurement compared to the GPL measurement. The average scores of convenience and confidence on pupil diameter measurements of questionnaire were higher for the APL compared to the GPL. The APL can increase the accuracy and save operating time of pupil diameter measurement and thereby promote the quality of health assessment and nursing care practice.
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Affiliation(s)
- Piao-Yi Chiou
- Department of Nursing, National Taipei University of Nursing and Health Sciences, Taipei City, Taiwan
| | - Chih-Yin Chien
- Department of Nursing, Mackay Medicine, Nursing and Management College, Taipei City, Taiwan
| | - Yi-Horng Lai
- Department of Health Care Administration, Oriental Institute of Technology, New Taipei City, Taiwan
- * E-mail:
| | - Chang Feng Chun
- Department of Optometry, Mackay Medicine, Nursing and Management College, Taipei City, Taiwan
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5
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Food and Drug Administration, HHS. Medical Devices; Ophthalmic Devices; Classification of the Intranasal Electrostimulation Device for Dry Eye Symptoms. Final order. Fed Regist 2018; 83:52973-5. [PMID: 30358957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The Food and Drug Administration (FDA or we) is classifying the intranasal electrostimulation device for dry eye symptoms into class II (special controls). The special controls that apply to the device type are identified in this order and will be part of the codified language for the intranasal electrostimulation device for dry eye symptoms' classification. We are taking this action because we have determined that classifying the device into class II (special controls) will provide a reasonable assurance of safety and effectiveness of the device. We believe this action will also enhance patients' access to beneficial innovative devices, in part by reducing regulatory burdens.
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Elloumi Y, Akil M, Kehtarnavaz N. A mobile computer aided system for optic nerve head detection. Comput Methods Programs Biomed 2018; 162:139-148. [PMID: 29903480 DOI: 10.1016/j.cmpb.2018.05.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 04/17/2018] [Accepted: 05/03/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND AND OBJECTIVE The detection of optic nerve head (ONH) in retinal fundus images plays a key role in identifying Diabetic Retinopathy (DR) as well as other abnormal conditions in eye examinations. This paper presents a method and its associated software towards the development of an Android smartphone app based on a previously developed ONH detection algorithm. The development of this app and the use of the d-Eye lens which can be snapped onto a smartphone provide a mobile and cost-effective computer-aided diagnosis (CAD) system in ophthalmology. In particular, this CAD system would allow eye examination to be conducted in remote locations with limited access to clinical facilities. METHODS A pre-processing step is first carried out to enable the ONH detection on the smartphone platform. Then, the optimization steps taken to run the algorithm in a computationally and memory efficient manner on the smartphone platform is discussed. RESULTS The smartphone code of the ONH detection algorithm was applied to the STARE and DRIVE databases resulting in about 96% and 100% detection rates, respectively, with an average execution time of about 2 s and 1.3 s. In addition, two other databases captured by the d-Eye and iExaminer snap-on lenses for smartphones were considered resulting in about 93% and 91% detection rates, respectively, with an average execution time of about 2.7 s and 2.2 s, respectively.
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Affiliation(s)
- Yaroub Elloumi
- Gaspard Monge Computer Science Laboratory, ESIEE-Paris, University Paris-Est Marne-la-Vallée, France; Medical Technology and Image Processing Laboratory, Faculty of medicine, University of Monastir, Tunisia.
| | - Mohamed Akil
- Gaspard Monge Computer Science Laboratory, ESIEE-Paris, University Paris-Est Marne-la-Vallée, France
| | - Nasser Kehtarnavaz
- Department of Electrical and Computer Engineering, University of Texas at Dallas, Richardson, TX 75080, USA
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Jiménez Benito J. A meditation on technique. Arch Soc Esp Oftalmol (Engl Ed) 2018; 93:313-314. [PMID: 29398238 DOI: 10.1016/j.oftal.2017.11.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 11/28/2017] [Indexed: 06/07/2023]
Affiliation(s)
- J Jiménez Benito
- Servicio de Oftalmología, Hospital Universitario de Burgos, Burgos, España.
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Abstract
A new surgical approach to the management of exudative maculopathies has been developed including the transvitreal route. As a result of surgery the subretinal spaces are drained and their viscous content removed. A special tool was designed for this operation. The method has been clinically tested on 32 patients (32 eyes) with different forms of age-related macular degeneration in the phase of complicated pigment epithelium detachment and on six patients (six eyes) with myopic exudative maculopathy. The follow-up ranged from 6 to 32 months. No fluid reappeared in the macular zone in patients with age-related macular degeneration, except one; visual function improved in 26 out of 32 cases (81.3%). Similar results were obtained in all six patients with myopic exudative maculopathy.
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Affiliation(s)
- M M Krasnov
- State Institute for Eye Diseases, Moscow, Russia
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Food and Drug Administration, HHS. Medical Devices; Ophthalmic Devices; Classification of the Tear Electrostimulation Device. Final order. Fed Regist 2017; 82:60114-6. [PMID: 29256575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The Food and Drug Administration (FDA or we) is classifying the tear electrostimulation device into class II (special controls). The special controls that apply to the device type are identified in this order and will be part of the codified language for the tear electrostimulation device's classification. We are taking this action because we have determined that classifying the device into class II (special controls) will provide a reasonable assurance of safety and effectiveness of the device. We believe this action will also enhance patients' access to beneficial innovative devices, in part by reducing regulatory burdens.
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Abstract
We present an opto-mechanical artificial eye that can be used for examining multi-wavelength ophthalmic instruments. Standard off-the-shelf lenses and a refractive-index-matching fluid were used in the creation of the artificial eye. In addition to dispersive properties, the artificial eye can be used to simulate refractive error. To analyze the artificial eye, a multi-wavelength Hartmann-Shack aberrometer was used to measure the longitudinal chromatic aberration and the possibility of inducing refractive error. Off-axis chromatic aberrations were also analyzed by imaging through the artificial eye at two discrete wavelengths. Possible extensions to the dispersive artificial eye are also discussed.
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Zhang W, Nicholas P, Schuman SG, Allingham MJ, Faridi A, Suthar T, Cousins SW, Prakalapakorn SG. Screening for Diabetic Retinopathy Using a Portable, Noncontact, Nonmydriatic Handheld Retinal Camera. J Diabetes Sci Technol 2017; 11:128-134. [PMID: 27402242 PMCID: PMC5375071 DOI: 10.1177/1932296816658902] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Diabetic retinopathy (DR) is a leading cause of low vision and blindness. We evaluated the feasibility of using a handheld, noncontact digital retinal camera, Pictor, to obtain retinal images in dilated and undilated eyes for DR screening. We also evaluated the accuracy of ophthalmologists with different levels of training/experience in grading these images to identify eyes with vision-threatening DR. METHODS A prospective study of diabetic adults scheduled to have dilated eye exams at Duke Eye Center from January to May 2014 was conducted. An imager acquired retinal images pre- and postdilation with Pictor and selected 1 pre- and 1 postdilation image per eye. Five masked ophthalmologists graded images for gradability (based on image focus and centration) and the presence of no, mild, moderate, or severe nonproliferative DR (NPDR) or proliferative DR (PDR). Referable disease was defined as moderate or severe NPDR or PDR on image grading. We evaluated feasibility based on the graders' evaluation of image gradability. We evaluated accuracy of identifying vision-threatening disease (severe NPDR or PDR documented on dilated clinical examination) based on the graders' sensitivity and specificity of grading referable disease. RESULTS Images were gradable in 86-94% of predilation and 94-97% of postdilation photos. Compared to the dilated clinical exam, overall sensitivity for identifying vision-threatening DR was 64-88% and specificity was 71-90%. CONCLUSIONS Pictor can capture retinal images of sufficient quality to screen for DR with and without dilation. Single retinal images obtained using Pictor can identify eyes with vision-threatening DR with high sensitivity and acceptable specificity compared to clinical exam.
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Affiliation(s)
- Wenlan Zhang
- Duke University, Department of Ophthalmology, Durham, NC, USA
| | - Peter Nicholas
- Duke University, Department of Ophthalmology, Durham, NC, USA
| | | | | | - Ambar Faridi
- Duke University, Department of Ophthalmology, Durham, NC, USA
| | - Tushar Suthar
- Duke University, Department of Ophthalmology, Durham, NC, USA
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Abstract
In the years since its introduction, retinal imaging has transformed our capability to visualize the posterior pole of the eye. Increasing practical advances in mobile technology, regular monitoring, and population screening for diabetic retinopathy management offer the opportunity for further development of cost-effective applications through remote assessment of the diabetic eye using portable retinal cameras, smart-phone-based devices and telemedicine networks. Numerous retinal imaging methods and mobile technologies in tele-ophthalmology applications have been reported for diabetic retinopathy screening and management. They provide several advantages of automation, sensitivity, specificity, portability, and miniaturization for the development of point-of-care diagnostics for eye complications in diabetes. The aim of this paper is to review the role of retinal imaging and mobile technologies in tele-ophthalmology applications for diabetic retinopathy screening and management. At large, although improvements in current technology and telemedicine services are still needed, telemedicine has demonstrated to be a worthy tool to support health caregivers in the effective management and prevention of diabetes and its complications.
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Affiliation(s)
- Delia Cabrera DeBuc
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 900 NW 17th Street, Miami, FL, 33136, USA.
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Wang J, Ma X, Wu Y, Liao M, Liu L. The effectiveness of disc synoptoscope on patients with abnormal binocular vision: a prospective cohort study. Int Ophthalmol 2016; 37:1139-1146. [PMID: 27770391 DOI: 10.1007/s10792-016-0378-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 10/12/2016] [Indexed: 02/05/2023]
Abstract
PURPOSE We performed a prospective cohort study to evaluate the effectiveness of disc synoptoscope on binocularity in patients with abnormal binocular vision. METHODS 39 eligible subjects were recruited for visual therapy with disc synoptoscope in treatment group and 38 were just observed as control. RESULTS Simultaneous perception in treatment group was better than controls at 6-month visit (p < 0.05). Fusional amplitude improved in treatment group but decreased in control group at 3- and 6-months visits (p < 0.001). Near and distance stereopsis in treatment group were better than controls at 3- and 6-months (p < 0.05). The improvements of monocular and binocular acuity in treatment group were better than controls at 3- and 6-months (p < 0.05). Postoperative recurrence rate in treatment group was lower than controls (p < 0.05). CONCLUSION Visual therapy with disc synoptoscope is effective in improving short-term binocular vision for the patients with abnormal binocular vision; disc synoptoscope could serve as an effective home-based visual therapy instrument.
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Affiliation(s)
- Jianglan Wang
- Department of Optometry and Visual Science, West China Hospital, Sichuan University, No.17, Block 3, South People Road, Chengdu, 610041, Sichuan Province, China
| | - Xin Ma
- Department of Optometry and Visual Science, West China Hospital, Sichuan University, No.17, Block 3, South People Road, Chengdu, 610041, Sichuan Province, China
| | - Ye Wu
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Meng Liao
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China
| | - Longqian Liu
- Department of Ophthalmology, West China Hospital, Sichuan University, Chengdu, Sichuan Province, China.
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Food and Drug Administration, HHS. Medical Devices; Ophthalmic Devices; Classification of Strabismus Detection Device. Final order. Fed Regist 2016; 81:65279-81. [PMID: 27658316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The Food and Drug Administration (FDA) is classifying the strabismus detection device into class II (special controls). The special controls that will apply to the device are identified in this order and will be part of the codified language for the strabismus detection device's classification. The Agency is classifying the device into class II (special controls) in order to provide a reasonable assurance of safety and effectiveness of the device.
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Food and Drug Administration, HHS. Medical Devices; Ophthalmic Devices; Classification of Nasolacrimal Compression Device. Final order. Fed Regist 2016; 81:37499-500. [PMID: 27295735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The Food and Drug Administration (FDA) is classifying the nasolacrimal compression device into class I (general controls). The Agency is classifying the device into class I (general controls) in order to provide a reasonable assurance of safety and effectiveness of the device.
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Food and Drug Administration, HHS. Medical Devices; Ophthalmic Devices; Classification of the Diurnal Pattern Recorder System. Final order. Fed Regist 2016; 81:34269-71. [PMID: 27236873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The Food and Drug Administration (FDA) is classifying the diurnal pattern recorder system into class II (special controls). The special controls that will apply to the device are identified in this order and will be part of the codified language for the diurnal pattern recorder system's classification. The Agency is classifying the device into class II (special controls) in order to provide a reasonable assurance of safety and effectiveness of the device.
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Affiliation(s)
- Isabelle Clavagnier
- Lycée des métiers de la santé et du social François Rabelais, Ifsi, 9, rue Francis-de-Croisset, 75018 Paris, France.
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Loewen RT, Brown EN, Roy P, Schuman JS, Sigal IA, Loewen NA. Regionally Discrete Aqueous Humor Outflow Quantification Using Fluorescein Canalograms. PLoS One 2016; 11:e0151754. [PMID: 26998833 PMCID: PMC4801333 DOI: 10.1371/journal.pone.0151754] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 03/03/2016] [Indexed: 01/15/2023] Open
Abstract
PURPOSE To visualize and quantify conventional outflow directly in its anatomic location. METHODS We obtained fluorescein canalograms in six porcine whole eyes and six porcine anterior segment cultures. Eyes were perfused with a constant pressure of 15 mmHg using media containing 0.017 mg/ml fluorescein. Flow patterns were visualized using a stereo dissecting microscope equipped for fluorescent imaging. Images were captured every 30 seconds for 20 minutes for time lapse analysis. Anterior chamber cultures were imaged again on day three of culture. Canalograms were first analyzed for filling time per quadrant. We then wrote a program to automatically compute focal flow fits for each macropixel and to detect convergent perilimbal flow patterns with macropixels grouped into 3 equal-radial width rings around the cornea. A generalized additive model was used to determine fluorescence changes of individual macropixels. RESULTS The resulting imaging algorithm deployed 1024 macropixels that were fit to determine maximum intensity and time to fill. These individual fits highlighted the focal flow function. In whole eyes, significantly faster flow was seen in the inferonasal (IN) and superonasal (SN) quadrants compared to the superotemporal (ST) and inferotemporal (IT) ones (p<0.05). In anterior chamber cultures, reduced flow on day 1 increased in all quadrants on day 3 except in IT (p<0.05). Perilimbal ring analysis uncovered convergent perilimbal flow. CONCLUSIONS An algorithm was developed that analyzes regional and circumferential outflow patterns. This algorithm found flow patterns that changed over time and differ in whole eyes and anterior segment cultures.
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Affiliation(s)
- Ralitsa T. Loewen
- Department of Ophthalmology, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
- The Louis J. Fox Center for Vision Restoration, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
| | - Eric N. Brown
- Department of Ophthalmology, School of Medicine, Vanderbilt University, Nashville, United States of America
| | - Pritha Roy
- Department of Ophthalmology, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
- The Louis J. Fox Center for Vision Restoration, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
| | - Joel S. Schuman
- Department of Ophthalmology, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
- The Louis J. Fox Center for Vision Restoration, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
| | - Ian A. Sigal
- Department of Ophthalmology, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
- The Louis J. Fox Center for Vision Restoration, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
| | - Nils A. Loewen
- Department of Ophthalmology, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
- The Louis J. Fox Center for Vision Restoration, School of Medicine, University of Pittsburgh, Pittsburgh, United States of America
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Eszes DJ, Szabó DJ, Russell G, Kirby P, Paulik E, Nagymajtényi L, Facskó A, Moe MC, Petrovski BÉ. Diabetic Retinopathy Screening Using Telemedicine Tools: Pilot Study in Hungary. J Diabetes Res 2016; 2016:4529824. [PMID: 28078306 PMCID: PMC5204085 DOI: 10.1155/2016/4529824] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 10/27/2016] [Accepted: 11/03/2016] [Indexed: 11/17/2022] Open
Abstract
Introduction. Diabetic retinopathy (DR) is a sight-threatening complication of diabetes. Telemedicine tools can prevent blindness. We aimed to investigate the patients' satisfaction when using such tools (fundus camera examination) and the effect of demographic and socioeconomic factors on participation in screening. Methods. Pilot study involving fundus camera screening and self-administered questionnaire on participants' experience during fundus examination (comfort, reliability, and future interest in participation), as well as demographic and socioeconomic factors was performed on 89 patients with known diabetes in Csongrád County, a southeastern region of Hungary. Results. Thirty percent of the patients had never participated in any ophthalmological screening, while 25.7% had DR of some grade based upon a standard fundus camera examination and UK-based DR grading protocol (Spectra™ software). Large majority of the patients were satisfied with the screening and found it reliable and acceptable to undertake examination under pupil dilation; 67.3% were willing to undergo nonmydriatic fundus camera examination again. There was a statistically significant relationship between economic activity, education and marital status, and future interest in participation. Discussion. Participants found digital retinal screening to be reliable and satisfactory. Telemedicine can be a strong tool, supporting eye care professionals and allowing for faster and more comfortable DR screening.
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Affiliation(s)
- Dóra J. Eszes
- Department of Public Health, University of Szeged, Szeged, Hungary
| | - Dóra J. Szabó
- Department of Ophthalmology, Albert Szent-Györgyi Clinical Center, University of Szeged, Szeged, Hungary
| | - Greg Russell
- Health Intelligence, Clinical Development, Chesire, UK
| | - Phil Kirby
- Health Intelligence, Clinical Development, Chesire, UK
| | - Edit Paulik
- Department of Public Health, University of Szeged, Szeged, Hungary
| | | | - Andrea Facskó
- Department of Ophthalmology, Albert Szent-Györgyi Clinical Center, University of Szeged, Szeged, Hungary
| | - Morten C. Moe
- Centre of Eye Research, Department of Ophthalmology, Oslo University Hospital, University of Oslo, Oslo, Norway
| | - Beáta É. Petrovski
- Department of Public Health, University of Szeged, Szeged, Hungary
- Health Services Research Centre, Akershus University Hospital, Lørenskog, Norway
- Institute of Clinical Medicine, University of Oslo, Campus Ahus, Oslo, Norway
- *Beáta É. Petrovski:
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Li J, Ma J, Wang N. [Application of retinal oximeter in ophthalmology]. Zhonghua Yan Ke Za Zhi 2015; 51:864-868. [PMID: 26850588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Retinal oximeter is a new machine which has been used in the diagnose, treatment and research of several ophthalmic diseases for recent years. It allows ophthalmologists to gain retinal oxygen saturation directly. Therefore, retinal oximeter might be useful for ophthalmologists to understand ophthalmic diseases more deeper and clarify the impact of ischemia on retinal function. It has been reported in the literatures that retinal oximeter has potentially useful diagnostic and therapeutic indications in various eye diseases such as diabetic retinopathy, central retinal vein and artery occlusion, retinitis pigmentosa, glaucomatous optic neuropathy, et al. In this thesis, the application of retinal oximeter in ophthalmology is reviewed.
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Affiliation(s)
- Jing Li
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Ophthalmology & Vision Science Key Lab., Beijing 100730, China
| | - Jianmin Ma
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Ophthalmology & Vision Science Key Lab., Beijing 100730, China
| | - Ningli Wang
- Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing Institute of Ophthalmology, Beijing Ophthalmology & Vision Science Key Lab., Beijing 100730, China;
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Fang YC, Yen CT, Chu CH. Study of optical design of three-dimensional digital ophthalmoscopes. Appl Opt 2015; 54:E224-E234. [PMID: 26479657 DOI: 10.1364/ao.54.00e224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This study primarily involves using optical zoom structures to design a three-dimensional (3D) human-eye optical sensory system with infrared and visible light. According to experimental data on two-dimensional (2D) and 3D images, human-eye recognition of 3D images is substantially higher (approximately 13.182%) than that of 2D images. Thus, 3D images are more effective than 2D images when they are used at work or in high-recognition devices. In the optical system design, infrared and visible light wavebands were incorporated as light sources to perform simulations. The results can be used to facilitate the design of optical systems suitable for 3D digital ophthalmoscopes.
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Food and Drug Administration, HHS. Medical Devices; Ophthalmic Devices; Classification of the Oral Electronic Vision Aid. Final order. Fed Regist 2015; 80:57090-2. [PMID: 26394454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The Food and Drug Administration (FDA) is classifying the oral electronic vision aid into class II (special controls). The special controls that will apply to the device are identified in this order and will be part of the codified language for the oral electronic vision aid's classification. The Agency is classifying the device into class II (special controls) in order to provide a reasonable assurance of safety and effectiveness of the device.
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Panwar N, Huang P, Lee J, Keane PA, Chuan TS, Richhariya A, Teoh S, Lim TH, Agrawal R. Fundus Photography in the 21st Century--A Review of Recent Technological Advances and Their Implications for Worldwide Healthcare. Telemed J E Health 2015; 22:198-208. [PMID: 26308281 DOI: 10.1089/tmj.2015.0068] [Citation(s) in RCA: 119] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND The introduction of fundus photography has impacted retinal imaging and retinal screening programs significantly. LITERATURE REVIEW Fundus cameras play a vital role in addressing the cause of preventive blindness. More attention is being turned to developing countries, where infrastructure and access to healthcare are limited. One of the major limitations for tele-ophthalmology is restricted access to the office-based fundus camera. RESULTS Recent advances in access to telecommunications coupled with introduction of portable cameras and smartphone-based fundus imaging systems have resulted in an exponential surge in available technologies for portable fundus photography. Retinal cameras in the near future would have to cater to these needs by featuring a low-cost, portable design with automated controls and digitalized images with Web-based transfer. CONCLUSIONS In this review, we aim to highlight the advances of fundus photography for retinal screening as well as discuss the advantages, disadvantages, and implications of the various technologies that are currently available.
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Affiliation(s)
- Nishtha Panwar
- 1 School of Electrical and Electronic Engineering, Nanyang Technological University , Singapore
| | - Philemon Huang
- 2 National Healthcare Group Eye Institute, Tan Tock Seng Hospital , Singapore
| | - Jiaying Lee
- 2 National Healthcare Group Eye Institute, Tan Tock Seng Hospital , Singapore
| | - Pearse A Keane
- 3 NIHR Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust , London, United Kingdom
- 4 Institute of Ophthalmology, University College London , London, United Kingdom
| | - Tjin Swee Chuan
- 1 School of Electrical and Electronic Engineering, Nanyang Technological University , Singapore
| | - Ashutosh Richhariya
- 5 Institute of Translational Research, Engineering, and Advancement of Technology, L.V. Prasad Eye Institute , Hyderabad, India
| | - Stephen Teoh
- 2 National Healthcare Group Eye Institute, Tan Tock Seng Hospital , Singapore
| | - Tock Han Lim
- 2 National Healthcare Group Eye Institute, Tan Tock Seng Hospital , Singapore
| | - Rupesh Agrawal
- 2 National Healthcare Group Eye Institute, Tan Tock Seng Hospital , Singapore
- 3 NIHR Biomedical Research Centre, Moorfields Eye Hospital NHS Foundation Trust , London, United Kingdom
- 4 Institute of Ophthalmology, University College London , London, United Kingdom
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Kang J, Xiao F, Zhao J, Zhao H, Hu Y, Tang G, Dai Y, Zhang Y. Effects of higher-order aberration correction on stereopsis at different viewing durations. J Biomed Opt 2015; 20:75005. [PMID: 26172611 DOI: 10.1117/1.jbo.20.7.075005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 06/15/2015] [Indexed: 05/12/2023]
Abstract
To better understand how the eye's optics affects stereopsis, we measured stereoacuity before and after higher-order aberration (HOA) correction with a binocular adaptive optics visual simulator. The HOAs were corrected either binocularly or monocularly in the better eye (the eye with better contrast sensitivity). A two-line stereo pattern served as the visual stimulus. Stereo thresholds at different viewing durations were obtained with the psychophysical method of constant stimuli. Binocular HOA correction led to significant improvement in stereoacuity. However, better eye HOA correction could bring either a bad degradation or a slight improvement in stereoacuity. As viewing duration increased, the stereo benefit approached the level of 1.0 for both binocular and better eye correction, suggesting that long viewing durations might weaken the effects of the eye's optical quality on stereopsis.
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Affiliation(s)
- Jian Kang
- Chinese Academy of Sciences, Institute of Optics and Electronics, The Laboratory on Adaptive Optics, Chengdu 610209, ChinabChinese Academy of Sciences, The Key Laboratory on Adaptive Optics, Chengdu 610209, ChinacUniversity of Chinese Academy of Sciences
| | - Fei Xiao
- Chinese Academy of Sciences, Institute of Optics and Electronics, The Laboratory on Adaptive Optics, Chengdu 610209, ChinabChinese Academy of Sciences, The Key Laboratory on Adaptive Optics, Chengdu 610209, ChinacUniversity of Chinese Academy of Sciences
| | - Junlei Zhao
- Chinese Academy of Sciences, Institute of Optics and Electronics, The Laboratory on Adaptive Optics, Chengdu 610209, ChinabChinese Academy of Sciences, The Key Laboratory on Adaptive Optics, Chengdu 610209, ChinacUniversity of Chinese Academy of Sciences
| | - Haoxin Zhao
- Chinese Academy of Sciences, Institute of Optics and Electronics, The Laboratory on Adaptive Optics, Chengdu 610209, ChinabChinese Academy of Sciences, The Key Laboratory on Adaptive Optics, Chengdu 610209, China
| | - Yiyun Hu
- Chinese Academy of Sciences, Institute of Optics and Electronics, The Laboratory on Adaptive Optics, Chengdu 610209, ChinabChinese Academy of Sciences, The Key Laboratory on Adaptive Optics, Chengdu 610209, China
| | - Guomao Tang
- Chinese Academy of Sciences, Institute of Optics and Electronics, The Laboratory on Adaptive Optics, Chengdu 610209, ChinabChinese Academy of Sciences, The Key Laboratory on Adaptive Optics, Chengdu 610209, China
| | - Yun Dai
- Chinese Academy of Sciences, Institute of Optics and Electronics, The Laboratory on Adaptive Optics, Chengdu 610209, ChinabChinese Academy of Sciences, The Key Laboratory on Adaptive Optics, Chengdu 610209, China
| | - Yudong Zhang
- Chinese Academy of Sciences, Institute of Optics and Electronics, The Laboratory on Adaptive Optics, Chengdu 610209, ChinabChinese Academy of Sciences, The Key Laboratory on Adaptive Optics, Chengdu 610209, China
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Abstract
Inappropriate parallax setting in stereoscopic content generally causes visual fatigue and visual discomfort. To optimize three dimensional (3D) effects in stereoscopic content by taking into account health issue, understanding how user gazes at 3D direction in virtual space is currently an important research topic. In this paper, we report the study of developing a novel 3D gaze tracking system for Nvidia 3D Vision(®) to be used in desktop stereoscopic display. We suggest an optimized geometric method to accurately measure the position of virtual 3D object. Our experimental result shows that the proposed system achieved better accuracy compared to conventional geometric method by average errors 0.83 cm, 0.87 cm, and 1.06 cm in X, Y, and Z dimensions, respectively.
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26
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Xu Y, Wang C. [Hebei Province Ophthalmologists current situation survey 2013]. Zhonghua Yan Ke Za Zhi 2015; 51:499-504. [PMID: 26310252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
OBJECTIVE This survey is conducted by Hebei Society of Ophthalmology to understand the current situation of the department of ophthalmology in Hebei province, in order to help the Branch to develop an effective, highly-targeted and practical continuing education program. METHODS A questionnaire is used in this survey, which consists of 4 sections and 25 items, covering Basic Information, Hospital and Department, Personal Practice and Open-ended Questions. The questionnaire is distributed and collected by the Society of Ophthalmology of each region in Hebei province to all medical institutions in their area which have the ability to carry out ophthalmic clinical work. After the aggregation of the questionnaire and according to the omission, Hebei Society of Ophthalmology contacts the individuals who missed the survey by direct calls, letter post and email, etc. to finish the survey. RESULTS This survey covers 121 counties and cities (coverage 85.8%), 305 medical institutions and 1 485 ophthalmologists. Results shows that trained ophthalmologists take a high proportion (84.3%) in all hospitals, the percentage of ophthalmologists who are eager to learn and improve is high (94.8%), the percentage of ophthalmologists having a Bachelor degree or above is high (68.9%). However, the percentage of ophthalmologists having a Master or Doctor degree is relatively low (19.6%), the talents who can independently carry out vitrectomy are insufficient (4.1%), the percentage of the medical institutions not having basic ophthalmic equipment is high (37.3%). CONCLUSIONS The reasons restraining the development of Ophthalmology in Hebei province include the lack of professional talents and ophthalmic equipment. The contradiction between the increasing demand of the public for ophthalmological treatment and the limited medical service level we can provide is the primary contradiction in the departments of Ophthalmology in Hebei province. After the survey and according to the results, Hebei Society of Ophthalmology will organize more training to meet the desire and interest of the ophthalmologists in our province, to achieve the ultimately goal of improving the Ophthalmic medical level throughout the province.
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Affiliation(s)
- Yincong Xu
- The Secretary of Hebei Society of Ophthalmology, Shijiazhuang 050000, China
| | - Chaoying Wang
- The Secretary of Hebei Society of Ophthalmology, Shijiazhuang 050000, China;
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27
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Brock H. New accessories for operation microscopes in ophthalmic microsurgery. Dev Ophthalmol 2015; 18:16-23. [PMID: 2673865 DOI: 10.1159/000417083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- H Brock
- Firma Carl Zeiss, Oberkochen, BRD
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28
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Lim AS. Extended use of vitrectomy instruments. Dev Ophthalmol 2015; 5:74-6. [PMID: 7343358 DOI: 10.1159/000400943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Huber C. Three ophthalmological instruments: the rotating contact glass holder, the cutying forceps and the diamond cystotome. Dev Ophthalmol 2015; 18:102-6. [PMID: 2776938 DOI: 10.1159/000417097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Three new ophthalmological instruments are described: a rotating contact glass holder for easier control of the three-mirror Goldmann or other diagnostic contact lens which must be rotated on the eye; a suture-tying forceps combined with a sapphire blade, combining the tying and cutting functions in one instrument and a diamond cystotome for anterior capsulectomy with a cutting edge of unequalled sharpness.
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30
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Affiliation(s)
- O Ferrer
- Horacio Ferrer Institute, Miami, Fla
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31
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Cleasby GW. Vitreous surgery as a supplement to anterior segment surgery. Dev Ophthalmol 2015; 2:146-62. [PMID: 7262395 DOI: 10.1159/000395318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Selected vitreous surgery techniques can provide effective and safe means of supplementing anterior segment surgery for correction or avoidance of many problems. In my experience, the guillotine or piston action vitrectomy instruments are more effective and safer than those which have a rotating or oscillating action. Pars plana vitreous surgery has added a new dimension to anterior segment surgery. There is reason to hope that the future will bring further refinements of instrumentation and surgical technique and more precise knowledge of the indications and limitations of this type of surgery.
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32
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Gibson C, Roche E. A survey of general practitioners' knowledge and perceived confidence with clinical ophthalmology. Ir Med J 2014; 107:173-175. [PMID: 24988833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The quality of general practitioner (GP) ophthalmology referrals to emergency departments has been reported to be sub-optimal. It is possible that a lack of adequate formal training in ophthalmology for GPs contributes to this situation. Data in this study was obtained from a postal survey of GPs to ascertain their knowledge of, and confidence with, clinical ophthalmology skills as well as their training in this speciality. Undergraduate ophthalmology training was rated as inadequate by 35/50 (70%) respondents. 28 (56%) respondents reported to be confident with their clinical ophthalmology skills. 19 (38%) GPs reported to have good knowledge of ophthalmology, and this was strongly associated with a positive appraisal of their undergraduate ophthalmology training (92%, P < 0.01), having experience working in an ophthalmology department (80%, p = 0.14) and having received GP training abroad (52%, p = 0.16). Regarding ophthalmology equipment, 47 (94%) GPs reported to have an ophthalmoscope but only 33 (66%) were confident with its use and just 20 (40%) could confidently distinguish an abnormal optic disc. Lack of knowledge of ophthalmology may have a significant impact on patient care and could be addressed by including clinical skills training in GP specialist training or continuing professional development schemes.
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33
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Pearce EC, Hall JE, Boyd KL, Rousseau B, Ries WR. The ophthalmology microscalpel versus standard scalpels and wound healing in a rat model. Otolaryngol Head Neck Surg 2014; 151:424-30. [PMID: 24866476 DOI: 10.1177/0194599814536699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE We tested the hypothesis that the ophthalmology microscalpel, compared to standard incisional instruments, causes less trauma during incisions resulting in decreased inflammation and greater tensile strength of wounds. STUDY DESIGN Prospective animal study. SETTING Animal laboratory. SUBJECTS AND METHODS Thirty-four Sprague-Dawley rats received dorsum skin incisions with the microscalpel, electrosurgical device, 11 blade scalpel, and 15 blade scalpel. Wounds were harvested at 1 week, 2 weeks, 3 weeks, and 6 weeks, then analyzed histologically in a blinded manner for inflammation markers and tested for tensile strength. RESULTS The microscalpel wounds had significantly higher tensile strength compared to the 15 blade (P = .045) and electrocautery device (P = .000) but equivocal strength to the 11 blade (P = .457). The electrocautery wounds were weaker than all 3 steel blades. No significant difference was found between the microscalpel, 11 blade, and 15 blade incisions for the 5 markers of inflammation. Electrocautery wounds had significantly worse inflammatory scores, specifically, higher angiogenesis and larger wound gap compared to the microscalpel (P = .004, P = .002), 11 blade (P = .007, P = .023), and 15 blade (P = .010, P = .003), respectively. CONCLUSION Microscalpel incisions result in less inflammation and increased tensile strength compared with electrocautery and higher tensile strength compared to the 15 blade in the rat model. Inflammation scores were equivocal between the microscalpel, 11 blade, and 15 blade. Our findings support the use of the microscalpel blade for facial plastic and reconstructive procedures. Prospective, randomized human studies are warranted.
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Affiliation(s)
- Elizabeth C Pearce
- Department of Otolaryngology-Head & Neck Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Joseph E Hall
- Department of Otolaryngology-Head & Neck Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Kelli L Boyd
- Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Bernard Rousseau
- Department of Otolaryngology-Head & Neck Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - W Russell Ries
- Department of Otolaryngology-Head & Neck Surgery, Vanderbilt University Medical Center, Nashville, Tennessee, USA
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Food and Drug Administration, HHS. Medical devices; ophthalmic devices; classification of the eyelid weight. Final rule. Fed Regist 2014; 79:22012-6. [PMID: 24754095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The Food and Drug Administration (FDA or Agency) is classifying the eyelid weight into class II (special controls). The Agency is exempting the external eyelid weight from premarket notification, but continuing to require premarket notification for implantable eyelid weights in order to provide a reasonable assurance of safety and effectiveness of the device. Both external and implantable eyelid weight devices are subject to special controls. The eyelid weight may be adhered to the outer skin of the upper eyelid (external eyelid weight) or implanted into the upper eyelid (implantable eyelid weight), and is intended for the gravity assisted treatment of lagophthalmos (incomplete eyelid closure).
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Kasprzak H, Mazur E, Widlicka M. Measurement and analysis of the air pressure curve on the rigid lenses by use of ocular response analyzer. Acta Bioeng Biomech 2014; 16:117-121. [PMID: 25597696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
PURPOSE Pressure curves obtained from Ocular Response Analyzer (ORA) differ for the same patient in form and height. In some cases measurements on the subject show significant differences between recorded pressure curves. The purpose of the paper is to examine if the differences result from the corneal properties or from the device operation. METHODS Examination of air pressure curves was carried out on four plano-convex glass lenses with radii of curvature close to the central corneal radius. Lenses were mounted in front of the air jet of the ORA analyzer. Series of 30 measurements on each lenses were recorded with 20 s and 60 s time interval between measurements. RESULTS were exported to computer and analyzed numerically. RESULTS RESULTS show much higher reproducibility of pressure curves in every series of measurements in comparison to pressure curves recorded on the patients eye. This demonstrates that ORA produces air pulses with high reproducibility. CONCLUSIONS Differences in air pressure pulses for the real eye can indicate the dynamics of ocular properties during measurements. Obtained pressure curves are not symmetrical and not well fitted by Gaussian curve. Type of asymmetry of air pressure curves may be explained by viscoelasticity of air.
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Affiliation(s)
- Henryk Kasprzak
- Institute of Physics, Wrocław University of Technology, Wrocław, Poland
| | - Ewa Mazur
- Institute of Biomedical Engineering and Instrumentation, Wrocław University of Technology, Wrocław, Poland
| | - Magdalena Widlicka
- Faculty of Mechanical Engineering, Wrocław University of Technology, Wrocław, Poland
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Food and Drug Administration, HHS. Medical devices; ophthalmic devices; classification of the scleral plug. Final rule. Fed Regist 2013; 78:68714-5. [PMID: 24236336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The Food and Drug Administration (FDA or Agency) is classifying the scleral plug into class II (special controls), and exempting the scleral plugs composed of surgical grade stainless steel (with or without coating in gold, silver, or titanium) from premarket notification (510(k)) and continuing to require premarket notification (510(k)) for all other scleral plugs in order to provide a reasonable assurance of safety and effectiveness of the device. The scleral plug is a prescription device used to provide temporary closure of a scleral incision during an ophthalmic surgical procedure.
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Qi H. [Development of slit-lamp microscope and its applications in optics]. Zhongguo Yi Liao Qi Xie Za Zhi 2013; 37:437-440. [PMID: 24617216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This paper mainly introduces the origin and development of the slit-lamp microscope, the basic structure, working principle and test methods, focuses on diffuse illumination, direct focal illumination, indirect illumination, retro illumination, zone of specular reflection and slit-lamp filter used in the optical inspection, to provide the reference for clinical general optometry practitioners and using slit-lamp microscope widely and standardized.
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38
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Zutis K, Trucco E, Hubschman JP, Reed D, Shah S, van Hemert J. Towards automatic detection of abnormal retinal capillaries in ultra-widefield-of-view retinal angiographic exams. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2013:7372-5. [PMID: 24111448 DOI: 10.1109/embc.2013.6611261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Retinal capillary abnormalities include small, leaky, severely tortuous blood vessels that are associated with a variety of retinal pathologies. We present a prototype image-processing system for detecting abnormal retinal capillary regions in ultra-widefield-of-view (UWFOV) fluorescein angiography exams of the human retina. The algorithm takes as input an UWFOV FA frame and returns the candidate regions identified. An SVM classifier is trained on regions traced by expert ophthalmologists. Tests with a variety of feature sets indicate that edge features and allied properties differentiate best between normal and abnormal retinal capillary regions. Experiments with an initial set of images from patients showing branch retinal vein occlusion (BRVO) indicate promising area under the ROC curve of 0.950 and a weighted Cohen's Kappa value of 0.822.
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Mukherjee B, George B, Sivaprakasam M. An efficient capacitive sensing scheme for an ophthalmic regional anesthesia training system. Annu Int Conf IEEE Eng Med Biol Soc 2013; 2013:894-7. [PMID: 24109832 DOI: 10.1109/embc.2013.6609645] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Ophthalmic regional blocks are critical preoperative procedures involving the insertion of a syringe needle into the orbital cavity at such a position and angle that akinesia and analgesia is achieved without damage or harm to the eye and its associated musculature. A training system that accurately represents the orbital anatomical features and provides qualitative feedback on the performed anesthetic technique, can be of immense help in reducing risks involved in regional block administration. In this paper, a training system that employs a special but simple capacitive sensing scheme has been developed. A rapid prototyped eye-model has been used to ensure anatomical accuracy. Capacitive transmitter electrodes placed on the orbital wall along the length of the extraocular muscles are excited with a special excitation sequence and the displacement current at the needle of the syringe is measured using simple electronic unit and a Data Acquisition System, enabling the developed Virtual Instrument to detect the depth of penetration and proximity of the syringe needle to the ocular muscles. Additionally, the system detects needle touch of the muscles accurately. The proposed electrode array system and excitation schemes have been validated on a prototype system thus demonstrating its usefulness for practical training purposes.
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40
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Khor WB, Han SB, Mehta JS, Tan DTH. Descemet stripping automated endothelial keratoplasty with a donor insertion device: clinical results and complications in 100 eyes. Am J Ophthalmol 2013; 156:773-9. [PMID: 23831219 DOI: 10.1016/j.ajo.2013.05.012] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 05/10/2013] [Accepted: 05/16/2013] [Indexed: 01/25/2023]
Abstract
PURPOSE To study the clinical outcomes of Descemet stripping automated endothelial keratoplasty (DSAEK) with the EndoGlide donor insertion device. DESIGN Retrospective interventional case series. METHODS We included 100 eyes that underwent DSAEK for Fuchs endothelial dystrophy or pseudophakic bullous keratopathy (PBK) at a single institution. Eyes with anterior segment pathology or previous intraocular surgery (except for uncomplicated cataract surgery) were excluded. Preoperative data included visual acuity and donor endothelial cell density by specular microscopy. The main outcome measures were postoperative best spectacle-corrected visual acuity (BSCVA) and endothelial cell loss at 3, 6, and 12 months. RESULTS There were 59 eyes with Fuchs dystrophy and 41 eyes with PBK. In eyes without vision-limiting pathology, the median postoperative BSCVA was consistently 20/40 (range 20/20-20/400) at 3 months (n = 61 eyes), 6 months (n = 55 eyes), and 12 months (n = 48 eyes). Endothelial cell loss was 13.7% at 3 months (n = 57), 13.5% at 6 months (n = 61), and 14.9% at 12 months (n = 53). Primary graft failure occurred in 1 eye, attributable to incorrect use of the insertion device. Two eyes with complete donor dislocation were rebubbled successfully. The most common complication was glaucoma/ocular hypertension in 29 eyes (34.1%) without prior glaucoma and treatment escalation in 6 eyes (40.0%) with prior glaucoma. Of the 78 eyes with 12 months follow-up, 2 (2.6%) developed endothelial rejection, and 1 (1.3%) subsequently failed. CONCLUSIONS The use of this donor insertion device during DSAEK demonstrates good outcomes and potentially low endothelial cell loss at up to 12 months after surgery.
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Affiliation(s)
- Wei-Boon Khor
- Singapore National Eye Centre, Singapore; Singapore Eye Research Institute, Singapore
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41
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Erlanger MS, Velez-Montoya R, Mackenzie D, Olson JL. Suction-based grasping tool for removal of regular- and irregular-shaped intraocular foreign bodies. Ophthalmic Surg Lasers Imaging Retina 2013; 44:487-9. [PMID: 24044713 DOI: 10.3928/23258160-20130909-12] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Accepted: 07/24/2013] [Indexed: 11/20/2022]
Abstract
BACKGROUND AND OBJECTIVE To describe a suction-based grasping tool for the surgical removal of irregular-shaped and nonferromagnetic intraocular foreign bodies. MATERIALS AND METHODS A surgical tool with suction capabilities, consisting of a stainless steel shaft with a plastic handle and a customizable and interchangeable suction tip, was designed in order to better engage and manipulate irregular-shaped in-traocular foreign bodies of various sizes and physical properties. The maximal suction force and surgical capabilities were assessed in the laboratory and on a cadaveric eye vitrectomy model. RESULTS The suction force of the water-tight seal between the intraocular foreign body and the suction tip was estimated to be approximately 40 MN. During an open-sky vitrectomy in a porcine model, the device was successful in engaging and firmly securing foreign bodies of different sizes and shapes. CONCLUSION The suction-based grasping tool enables removal of irregular-shaped and nonferromagnetic foreign bodies.
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Beliakin SA, Kriachko NS. [Requirements for information about medical parameters in the field of ophthalmology]. Voen Med Zh 2013; 334:43-44. [PMID: 24000637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The authors came to conclusion that modern concept of medical information systems imply the development of electronic case-record using medical archives, results of laboratory and instrumental researches, based on modern information exchange technologies. The main criterion of realisation of this concept is solving of diagnosis problems. All parameters of diagnosis and treatment can be divided into three groups: measurable, observable and calculable. Measurable parameters -parameters, whose quantitative meanings can be measured with the help of special equipment and procedures of ist application. Observable parameters--parameters that can be observed with the help of biomicroscope, fundus-camera, ophthalmoscope and etc. Specific characteristic of these parametrs is not a qualitative evaluation, but quantative description and high level of subjectivity. The third group--parameters that cannot be measured or observed. These parameters can be received computationally or in the process of simulating. These parameters are result of mechanical and mathematical simulation of physiological and pathologic process of visual organ. The authors suggested requirements for ophthalmological workstation.
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Vesely P, Synek S. Simple binocular vision examination on synoptophore determination of normative database of healthy adult subjects examination of binocular vision on synoptophore. Coll Antropol 2013; 37 Suppl 1:145-151. [PMID: 23837235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The main goal of our study was to determine the database of parameters of simple binocular vision (SBV) in healthy adult population. Next goal was to verify current data of particular parameters of SBV Average subjective deviation for far of all 74 subjects was 2.78 +/- 3.65 cm/m, of women was 2.90 +/- 3.69 cm/m and only for men was 2.00 +/- 3.49 cm/m. According our measurements the positive fusion range of all subjects is 25.10 +/- 12.77 cm/m, negative fusion range -6.45 +/- 4.18 cm/m, accommodation convergence to accommodation ratio (AC/A) is 3.41 +/- 1.47 cm/m and subjective deviation with accommodation on 33 cm (with minus 3 D) is 13.02 +/- 5.23 cm/m. Further we proved statistically significant correlation between these parameters of SBV: Age and AC/A, SU-3 and AC/A, SU0 and SU-3, SU-3 and FS0 and FS-3. Knowledge of basic SBV parameters is important not only for ophthalmologist but also for optometrists.
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Affiliation(s)
- Petr Vesely
- Masaryk University, School of Medicine, Department of Optometry and Orthoptics, Brno, Czech Republic.
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Shirai T, Friberg AT. Resolution improvement in spectral-domain optical coherence tomography based on classical intensity correlations. Opt Lett 2013; 38:115-117. [PMID: 23454933 DOI: 10.1364/ol.38.000115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We describe a resolution-improved spectral-domain (SD) optical coherence tomography (OCT) based on classical intensity correlations as a counterpart of the recently proposed intensity-based time-domain OCT. Similarly to quantum OCT, the setup employs the Hong-Ou-Mandel interferometer at the output of the conventional SD-OCT. It is shown theoretically that a factor-of-√2 improvement in axial resolution is obtained with this arrangement. Some unique and useful features of our proposed system are addressed.
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Affiliation(s)
- Tomohiro Shirai
- Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, Tsukuba, Japan.
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46
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Wilson GA. Intraoperative vitreous loss rate in New Zealand. Clin Exp Ophthalmol 2013; 41:615-6. [PMID: 23279553 DOI: 10.1111/ceo.12056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2012] [Accepted: 12/09/2012] [Indexed: 10/27/2022]
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Abstract
The Swedish ophthalmologist and self-taught mathematician Allvar Gullstrand (1862-1930) invented the slit lamp to illuminate the anterior of the eye. With its rectangular beam of very bright light, he studied the structure of the cornea and the function of the lens. His dioptric investigations showed that, as well as the extracapsular mechanism described by Helmholtz, changes in the substance of the lens, that he termed intracapsular, also contribute to accommodation. However, his invention has been appropriated by clinical ophthalmologists and is now routinely used in examination of the eye.
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Affiliation(s)
- P J Timoney
- Department of Ophthalmology, University of Kentucky, Lexington, USA.
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Roberts CH, Mtuy T, Derrick T, Burton MJ, Holland MJ. Eyescores: an open platform for secure electronic data and photographic evidence collection in ophthalmological field studies. Br J Ophthalmol 2012; 97:671-2. [PMID: 23264546 PMCID: PMC3632971 DOI: 10.1136/bjophthalmol-2012-302653] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Chrissy h Roberts
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, UK
| | - Tara Mtuy
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, UK
- Kilimanjaro Centre for Community Ophthalmology, KCMC Hospital, Moshi, Tanzania
| | - Tamsyn Derrick
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, UK
| | - Matthew J Burton
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, UK
| | - Martin J Holland
- Clinical Research Department, London School of Hygiene and Tropical Medicine, London, UK
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Wang M, Zhang L, Qian M. [Analysis residues of perfluorooctane used in ophthalmic operation]. Zhongguo Yi Liao Qi Xie Za Zhi 2012; 36:373-374. [PMID: 23289346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Analyzed the purity of the Perfluorooctane used for Ophthalmic operation using the FID (Flame Ionization Detector) method after the qualitative analysis of that. Research and discussion of the 1--hydrogen perfluorocarbon octane, which is the typical impurity of Perfluorooctane. The standard recovery of the 1--hydrogen perfluorocarbon octane is 93%-97% within the range of linearity, and the RSD (relative standard deviation) is below 2%. The above test method has the advantages of easy operation, stability and accuracy. So it is a good reference support to bring the specification of quality control of the Perfluorooctane which is used for Ophthalmic operation into YY of medical device.
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Affiliation(s)
- Minzhu Wang
- Medical Device Supervising and Testing Center of Hangzhou, State Food and Drug Administration, Hangzhou 310009.
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50
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Borish IM. A review of events leading to the development of modern optometry in the United States. Hindsight 2012; 43:28-34. [PMID: 23057223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Affiliation(s)
- Irvin M Borish
- Essilor of America, 13555 N. Stemmons Fwy., Dallas, TX 75234-5765, USA.
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