1
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Rajabi MT, Sadeghi R, Abdol Homayuni MR, Pezeshgi S, Hosseini SS, Rajabi MB, Poshtdar S. Optical coherence tomography angiography in thyroid associated ophthalmopathy: a systematic review. BMC Ophthalmol 2024; 24:304. [PMID: 39039451 PMCID: PMC11265183 DOI: 10.1186/s12886-024-03569-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Accepted: 07/10/2024] [Indexed: 07/24/2024] Open
Abstract
PURPOSE To evaluate the evidence for alterations of blood flow, vascular and perfusion densities in the choroid, macula, peripapillary region, and the area surrounding the optic nerve head (ONH) in patients with thyroid-associated ophthalmopathy (TAO) based on changes of OCTA parameters. METHODS A systematic review of Pubmed, Google Scholar, Scopus, WOS, Cochrane, and Embase databases, including quality assessment of published studies, investigating the alterations of OCTA parameters in TAO patients was conducted. The outcomes of interest comprised changes of perfusion and vascular densities in radial peripapillary capillary (RPC), ONH, superficial and deep retinal layers (SRL and DRL), choriocapillaris (CC) flow, and the extent of the foveal avascular zone (FAZ). RESULTS From the total of 1253 articles obtained from the databases, the pool of papers was narrowed down to studies published until March 20th, 2024. Lastly, 42 studies were taken into consideration which contained the data regarding the alterations of OCTA parameters including choriocapillary vascular flow, vascular and perfusion densities of retinal microvasculature, SRL, and DRL, changes in macular all grid sessions, changes of foveal, perifoveal and parafoveal densities, macular whole image vessel density (m-wiVD) and FAZ, in addition to alterations of ONH and RPC whole image vessel densities (onh-wiVD and rpc-wiVD) among TAO patients. The correlation of these parameters with visual field-associated parameters, such as Best-corrected visual acuity (BCVA), Visual field mean defect (VF-MD), axial length (AL), P100 amplitude, and latency, was also evaluated among TAO patients. CONCLUSION The application of OCTA has proven helpful in distinguishing active and inactive TAO patients, as well as differentiation of patients with or without DON, indicating the potential promising role of some OCTA measures for early detection of TAO with high sensitivity and specificity in addition to preventing the irreversible outcomes of TAO. OCTA assessments have also been applied to evaluate the effectiveness of TAO treatment approaches, including systemic corticosteroid therapy and surgical decompression.
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Affiliation(s)
- Mohammad Taher Rajabi
- Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Zip Code: 1336616351, Tehran, Iran
| | - Reza Sadeghi
- Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Zip Code: 1336616351, Tehran, Iran
- School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Reza Abdol Homayuni
- Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Zip Code: 1336616351, Tehran, Iran
- School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Saharnaz Pezeshgi
- Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Zip Code: 1336616351, Tehran, Iran
- School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Seyedeh Simindokht Hosseini
- Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Zip Code: 1336616351, Tehran, Iran
| | - Mohammad Bagher Rajabi
- Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Zip Code: 1336616351, Tehran, Iran
| | - Sepideh Poshtdar
- Eye Research Center, Farabi Eye Hospital, Tehran University of Medical Sciences, Zip Code: 1336616351, Tehran, Iran.
- Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran.
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2
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Xu S, Lin Z, Guo Y, Huang P, Huang S, Zhong Y. Diagnostic ability of the combination of retinal microvasculature evaluation and static automated perimetry for early primary open-angle glaucoma. Lasers Med Sci 2024; 39:154. [PMID: 38862806 DOI: 10.1007/s10103-024-04108-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 06/01/2024] [Indexed: 06/13/2024]
Abstract
PURPOSE To investigate the diagnostic ability of retinal superficial vasculature evaluation by optic coherence tomography angiography (OCTA) combined with visual field (VF) testing for early primary open-angle glaucoma (POAG). PATIENTS AND METHODS In this cross-sectional study, 84 participants were included, including 11 in the ocular hypertension (OHT) group, 11 in the preperimetric POAG (pre-POAG) group, 29 in the early POAG group and 33 in the control group. All participants underwent 6 × 6 mm2 scans of macula and optic nerved head by optic coherence tomography (OCT) and OCTA, along with white-on-white and blue-on-yellow VF testing by static automated perimetry. The ability of diagnosing early glaucoma by either various examinations separately or combination of examinations in both terms of function and structure was studied using the receiver operating characteristic (ROC) curve and the area under the curve (AUC). RESULTS The superficial retinal vessel densities (VD) in peri-nasal, para-temporal, peri-temporal and peri-inferior regions around the macula, as well as vessel area densities (VAD) in all peripapillary regions, were significantly different among the four groups, with lower VD or VAD in the early POAG patients compared to the normal individuals. The diagnostic ability of peripapillary superficial retinal VAD alone or VF testing alone was limited for early POAG only. However, the combination of these two was more effective in distinguishing normal individuals from OHT subjects or pre-POAG patients without VF defects, with better performance than the combination of peripapillary retinal nerve fiber layer (RNFL) thickness and VF indicators. CONCLUSIONS Peripapillary retinal vessel densities were generally lower in early POAG patients compared to normal individuals. The combination of peripapillary superficial retinal VAD by OCTA with white-on-white VF testing improved the ability to distinguish POAG patients at early stage without function impairment, which may help in providing reference and guidance for the following-up and treatment of suspected POAG patients.
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Affiliation(s)
- Shushu Xu
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, 197 Ruijin Er Road, Shanghai, 200025, China
| | - Zhongjing Lin
- Department of Ophthalmology, Renji Hospital Affiliated Medical School, Shanghai Jiaotong University, 160 Pujian Road, Shanghai, 200127, China
| | - Yanzhi Guo
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, 197 Ruijin Er Road, Shanghai, 200025, China
| | - Ping Huang
- Shanghai Key Laboratory for Bone and Joint Diseases, Ruijin Hospital Affiliated Medical School, Shanghai Institute of Traumatology and Orthopaedics, Shanghai Jiaotong University, 197 Ruijin Er Road, Shanghai, 200025, China
| | - Shouyue Huang
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, 197 Ruijin Er Road, Shanghai, 200025, China.
| | - Yisheng Zhong
- Department of Ophthalmology, Ruijin Hospital Affiliated Medical School, Shanghai Jiaotong University, 197 Ruijin Er Road, Shanghai, 200025, China.
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Shokoohi-Rad S, Shoeibi N, Ghasemi Nour M, Bakhtiari E. Evaluation of the Effect of Religious Fasting on Retinal Vessel Density and Retinal Thickness Using Optical Coherence Tomography Angiography. Neuroophthalmology 2021; 46:147-153. [DOI: 10.1080/01658107.2021.1995442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Saeed Shokoohi-Rad
- Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Nasser Shoeibi
- Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Ghasemi Nour
- Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Student Research Committee, Faculty of Medicine, Mashhad University of Medical Science, Mashhad, Iran
| | - Elham Bakhtiari
- Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
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4
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Dastiridou A, Kassos I, Katsanos A, Diafas A, Androudi S, Chopra V, Francis BA, Ziakas N. Does the ISNT rule apply to the radial peripapillary capillary vessel density in OCT angiography? Graefes Arch Clin Exp Ophthalmol 2021; 260:265-270. [PMID: 34379186 DOI: 10.1007/s00417-021-05367-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/29/2021] [Accepted: 08/03/2021] [Indexed: 11/29/2022] Open
Abstract
PURPOSE To investigate the applicability of ISNT (inferior ≥ superior ≥ nasal ≥ temporal), IST (inferior ≥ superior ≥ temporal), and T min (temporal quadrant with the minimum value) rules to the peripapillary nerve fiber layer (NFL) thickness and radial peripapillary capillary (RPC) vessel density (VD) using Optical Coherence Tomography (OCT) and OCT angiography (OCT-A). MATERIALS AND METHODS This cross-sectional study included 134 eyes of 74 healthy individuals. NFL thickness and RPC VD were measured in all four quadrants using OCT and OCT-A in order to determine the number of eyes that obey the ISNT, IST, and T min rules. RESULTS Mean age was 48.8 ± 15.5 (range 25-82) years. The ISNT rule was valid in 52 eyes (38.81%) on OCT and only 12 eyes (8.95%) on OCT-A scans. The IST rule was followed by 83 (61.94%) and 37 (27.61%) eyes on OCT and OCT-A scans respectively. The T min rule was valid in 86 eyes (64.18%) in OCT scans and in 26 eyes (19.4%) in OCT-A scans. CONCLUSION The topography of the RPC network does not obey the ISNT rule in healthy eyes. The ISNT rule and its variants were found to be more relevant in OCT NFL thickness measurements compared to OCT-A RPC VD measurements.
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Affiliation(s)
- Anna Dastiridou
- 2Nd Ophthalmology Department, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece. .,Ophthalmology Department, University of Thessalia, Larissa, Greece.
| | - Ioannis Kassos
- 2Nd Ophthalmology Department, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Andreas Katsanos
- Ophthalmology Department, University of Ioannina, Ioannina, Greece
| | - Asterios Diafas
- 2Nd Ophthalmology Department, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Sofia Androudi
- Ophthalmology Department, University of Thessalia, Larissa, Greece
| | - Vikas Chopra
- Doheny Eye Institute, Department of Ophthalmology, University of California Los Angeles, Los Angeles, CA, USA
| | - Brian A Francis
- Doheny Eye Institute, Department of Ophthalmology, University of California Los Angeles, Los Angeles, CA, USA
| | - Nikolaos Ziakas
- 2Nd Ophthalmology Department, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
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Effect of trabeculectomy on optic nerve head and macular vessel density: an optical coherence tomography angiography study. Int Ophthalmol 2021; 41:2677-2688. [PMID: 33782847 DOI: 10.1007/s10792-021-01823-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Accepted: 03/17/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE To investigate the effect of trabeculectomy on peripapillary and macular vessel density (VD) using optical coherence tomography angiography (OCT-A) in patients with primary open-angle glaucoma. METHODS This is a prospective, interventional study on 32 glaucoma eyes (21 patients) who underwent trabeculectomy. Optic nerve head (ONH) and macular structural and OCT-A scans were performed before surgery and at one and six months postoperatively with the Avanti device (AngioVue System, Optovue Inc., Fremont, CA). The primary outcomes of interest were changes in global and regional peripapillary and macular VD. RESULTS The average (standard deviation) age and visual field mean deviation of the sample were 58.9(9.9) years and -14.5(9.0) dB, respectively. The average (standard deviation) baseline intraocular pressure significantly decreased from 24.5(10.4) mmHg to 9.6(2.1) mmHg, 6 months after the surgery (P< 0.001). The mean (standard deviation) whole image VD of ONH had increased from 37.6(8.3)% to 40.5(9.1)% at 6 months after the surgery (P = 0.01) while its changes were not significant at month 1 (38.1(9.5)%, P = 0.64). The average of radial peripapillary circle (RPC) VD increased from 36.5(10.3)% to 39.3(10.8)% at 6 months (P = 0.04) compared to 1-month post-trabeculectomy (37.0(11.4)%, P = 0.71). Similar patterns at postoperative months 1 and 6 were also observed in RPC VD at superior and inferior hemifields as well as nasal and temporal quadrants. The observed changes in VD of macular, foveal, peri-, and parafoveal were not significant at superficial or deep slabs at 1 and 6 months after trabeculectomy (all P values > 0.05). CONCLUSION Our study demonstrated significant improvements in peripapillary vessel density at 6-month following trabeculectomy.
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6
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Zakova M, Lestak J, Fus M, Maresova K. Optical coherence tomography angiography and the visual field in hypertensive and normotensive glaucoma. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2020; 165:441-444. [PMID: 33057315 DOI: 10.5507/bp.2020.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 09/23/2020] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Hypertensive glaucoma (HTG) causes damage to the retinal ganglion cells and eventually to the entire visual pathway due to high intraocular pressure (IOP). However, increased IOP will also affect the vessel density (VD) of the posterior pole of the eye and the related retinal ganglion nerve fibres (RNFL). In normotensive glaucoma (NTG), the retinal ganglion cells are relatively intact. The pathology is at the level of ganglion fibres. The unanswered question is what has altered ganglion cell fibres at the level of the retina and optic nerve head in NTG? AIM The aim of this study was to determine whether there is a correlation between the retinal nerve fibre layer (RNFL) and vessel density (VD) at the same altitudinal half of the retina and the sum of sensitivities of the contralateral half of the visual field of the same eye in hypertensive and normotensive glaucoma (NTG). METHODS Our group included 20 patients with HTG and 20 patients with NTG. The Pearson's correlation coefficient r was used for evaluation of the relationship of the peripapillary RNFL and VD, visual field (using the fast threshold glaucoma program) as the sum of sensitivities in apostilbs (asb) to the extent of 0-22 degrees. The results of sensitivity were compared with the RNFL and VD of the contralateral altitudinal half of the retina in the same eye. RESULTS In the HTG group there was a moderate relationship between RNFL and VD (both hemifields), but no relationship between RNFL and VF. VD SH and VF IH showed weak correlation and VD IH and VF SH showed no correlation. In patients with NTG, we found a strong correlation between RNFL and VD (both hemifields), between VD SH and VF IH a moderate correlation, between VD IH and VF SH also a moderate correlation and a weak correlation between RNFL and VF. CONCLUSION By comparing the RNFL and VD at the same altitudinal halves of the retina, we found a moderate correlation in HTG and a strong correlation in NTG. We found no or a weak correlation between VD and VF in HTG. In NTG the relationship between VD and VF showed a strong correlation. These findings reveal the differences in the diagnostic groups.
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Affiliation(s)
- Marketa Zakova
- CTU in Prague, Faculty of Biomedical Engineering, 272 01 Kladno 2, Czech Republic
| | - Jan Lestak
- CTU in Prague, Faculty of Biomedical Engineering, 272 01 Kladno 2, Czech Republic.,Eye clinic JL Faculty of Biomedical Engineering CTU in Prague, 158 00 Prague 5, Czech Republic
| | - Martin Fus
- CTU in Prague, Faculty of Biomedical Engineering, 272 01 Kladno 2, Czech Republic.,Eye clinic JL Faculty of Biomedical Engineering CTU in Prague, 158 00 Prague 5, Czech Republic
| | - Klara Maresova
- Department of Ophthalmology, Faculty of Medicine and Dentistry, Palacky University Olomouc, Czech Republic
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7
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Clinical Utility of Triplicate En Face Image Averaging for Optical Coherence Tomography Angiography in Glaucoma and Glaucoma Suspects. J Glaucoma 2020; 29:823-830. [PMID: 32496464 DOI: 10.1097/ijg.0000000000001570] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PRéCIS:: Averaging triplicate en face angiograms of the radial peripapillary capillary (RPC) plexus with optical coherence tomography angiography (OCTA) improves vessel visualization, reduces vessel density parameters, and increases the diagnostic accuracy for glaucoma of one such parameter. PURPOSE The purpose of this study was to test the hypothesis that triplicate averaging of the RPC layer improves visualization and diagnostic accuracy of OCTA for glaucoma. MATERIALS AND METHODS This is a cross-sectional study involving 63 primary open-angle glaucoma patients and 70 age-matched glaucoma suspects. Triplicate 6×6 mm OCTA scans of the optic nerve head were acquired, and the RPC layer was extracted. RPC en face images were registered and averaged. Parameters of global entropy, global standard deviation, local texture correlation, local homogeneity, signal-to-noise ratio, and intercapillary distance were used to measure the change in visualization with averaging. Vessel area density (VAD), vessel skeleton density (VSD), and flux parameters were calculated in a 2.8 mm annulus excluding the optic disc. The diagnostic accuracy of these parameters for glaucoma was assessed by calculating the area under the receiver operating curve (AUC) values. RESULTS Three-frame averaging resulted in decreased global entropy and global standard deviation (Ps<0.001), and increased local texture correlation, local homogeneity, signal-to-noise ratio, and intercapillary distance (Ps<0.001). Averaged images also had reduced VAD, VSD, and flux (Ps<0.001). AUC was significantly increased for VSD after image averaging (P=0.018), while no significant change in AUC was observed for VAD (P=0.229) or flux (P=0.193). CONCLUSIONS Triplicate averaging improves visualization of the RPC layer and the diagnostic accuracy of VSD for glaucoma. The impact of image averaging on OCTA diagnostic performance and other potential applications warrants further exploration.
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Yao X, Alam MN, Le D, Toslak D. Quantitative optical coherence tomography angiography: A review. Exp Biol Med (Maywood) 2020; 245:301-312. [PMID: 31958986 PMCID: PMC7370602 DOI: 10.1177/1535370219899893] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
As a new optical coherence tomography (OCT) modality, OCT angiography (OCTA) provides a noninvasive method to detect microvascular distortions correlated with eye conditions. By providing unparalleled capability to differentiate individual plexus layers in the retina, OCTA has demonstrated its excellence in clinical management of diabetic retinopathy, glaucoma, sickle cell retinopathy, diabetic macular edema, and other eye diseases. Quantitative OCTA analysis of retinal and choroidal vasculatures is essential to standardize objective interpretations of clinical outcome. Quantitative features, including blood vessel tortuosity, blood vessel caliber, blood vessel density, vessel perimeter index, fovea avascular zone area, fovea avascular zone contour irregularity, vessel branching coefficient, vessel branching angle, branching width ratio, and choroidal vascular analysis have been established for objective OCTA assessment. Moreover, differential artery–vein analysis has been recently demonstrated to improve OCTA performance for objective detection and classification of eye diseases. In this review, technical rationales and clinical applications of these quantitative OCTA features are summarized, and future prospects for using these quantitative OCTA features for artificial intelligence classification of eye conditions are discussed.
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Affiliation(s)
- Xincheng Yao
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, USA
- Department of Ophthalmology and Visual Sciences, University of Illinois at Chicago, Chicago, IL 60612, USA
| | - Minhaj N Alam
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - David Le
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, USA
| | - Devrim Toslak
- Department of Bioengineering, University of Illinois at Chicago, Chicago, IL 60607, USA
- Department of Ophthalmology, Antalya Training and Research Hospital, Antalya 07030, Turkey
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9
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Abstract
There is growing evidence that vascular dysfunction plays a role in the pathogenesis of glaucoma. The details of this relationship have remained elusive partially due to limitations in our ability to assess blood flow in the optic nerve. Optical coherence tomography angiography (OCTA) has emerged as a promising new technology well positioned to become the first clinically suitable test of optic nerve perfusion. OCTA uses the motion of red blood cells as an intrinsic contrast agent to create reproducible images of microvascular networks rapidly and non-invasively. A significant body of research regarding the use of OCTA in glaucoma has emerged in recent years. This review aims to provide an overview of the basic principles underlying OCTA technology, summarize the current literature regarding the application of OCTA in the management of glaucoma, and address the role of OCTA in explicating the vascular pathogenesis of glaucoma.
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Affiliation(s)
- Astrid C Werner
- a Department of Ophthalmology , Massachusetts Eye and Ear Infirmary , Boston , USA
| | - Lucy Q Shen
- a Department of Ophthalmology , Massachusetts Eye and Ear Infirmary , Boston , USA
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10
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Cao D, Yang D, Yu H, Xie J, Zeng Y, Wang J, Zhang L. Optic nerve head perfusion changes preceding peripapillary retinal nerve fibre layer thinning in preclinical diabetic retinopathy. Clin Exp Ophthalmol 2019; 47:219-225. [PMID: 30203562 DOI: 10.1111/ceo.13390] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2018] [Revised: 09/03/2018] [Accepted: 09/06/2018] [Indexed: 02/05/2023]
Abstract
IMPORTANCE Whether neural or vascular defects occur first in the early onset of diabetic retinopathy (DR) is undetermined. BACKGROUND To investigate microcirculation and microstructure differences of optic nerve head (ONH) between diabetic eyes without clinically evident retinopathy and healthy controls using optical coherence tomography angiography (OCTA). DESIGN Cross-sectional observational study. PARTICIPANTS Sixty eyes of 60 patients with type 2 diabetes and without clinically evident retinopathy and 60 eyes of 60 age-matched healthy controls were included in this study. METHODS All participants underwent 4.5 × 4.5-mm rectangle scans centred on the ONH using OCTA (RTVue-XR Avanti; Optovue, Fremont, CA). MAIN OUTCOME MEASURES Peripapillary retinal nerve fibre layer (RNFL) thickness and capillary perfusion density inside the ONH and in the peripapillary region were compared between the two groups. RESULTS Vessel density values in both peripapillary and inside the disc were significantly lower in diabetic patients without DR compared to normal controls. The reduction of vessel density was prominent in all eight peripapillary sectors in diabetic eyes (all P < 0.05). Thinning of RNFL thickness was significant in the nasal superior (P < 0.001), inferior nasal (P = 0.023) and superior nasal quadrant (P < 0.001) in diabetic eyes in comparison to normal controls. CONCLUSIONS AND RELEVANCE ONH perfusion and peripapillary RNFL thickness were significantly decreased in preclinical DR patients compared to normal controls. Microvascular alterations in ONH may occur earlier than peripapillary RNFL defect in the course of DR.
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Affiliation(s)
- Dan Cao
- Department of Ophthalmology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Dawei Yang
- Department of Ophthalmology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- Shantou University Medical College, Shantou, China
| | - Honghua Yu
- Department of Ophthalmology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Jianteng Xie
- Department of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Yunkao Zeng
- Department of Ophthalmology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
- Shantou University Medical College, Shantou, China
| | - Jun Wang
- Department of Ophthalmology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Liang Zhang
- Department of Ophthalmology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
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11
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Chua J, Tan B, Ang M, Nongpiur ME, Tan AC, Najjar RP, Milea D, Schmetterer L. Future clinical applicability of optical coherence tomography angiography. Clin Exp Optom 2018; 102:260-269. [PMID: 30537233 DOI: 10.1111/cxo.12854] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 09/28/2018] [Accepted: 10/12/2018] [Indexed: 12/28/2022] Open
Abstract
Optical coherence tomography angiography (OCT-A) is an emerging technology that allows for the non-invasive imaging of the ocular microvasculature. Despite the wealth of observations and numerous research studies illustrating the potential clinical uses of OCT-A, this technique is currently rarely used in routine clinical settings. In this review, technical and clinical aspects of OCT-A imaging are discussed, and the future clinical potential of OCT-A is considered. An understanding of the basic principles and limitations of OCT-A technology will better inform clinicians of its future potential in the diagnosis and management of ocular diseases.
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Affiliation(s)
- Jacqueline Chua
- Ocular Imaging Group, Singapore Eye Research Institute, Singapore National Eye Centre, Singapore.,Eye, Academic Clinical Program, Duke-NUS Medical School, Singapore
| | - Bingyao Tan
- Ocular Imaging Group, Singapore Eye Research Institute, Singapore National Eye Centre, Singapore
| | - Marcus Ang
- Ocular Imaging Group, Singapore Eye Research Institute, Singapore National Eye Centre, Singapore.,Eye, Academic Clinical Program, Duke-NUS Medical School, Singapore.,External Disease and Cornea Service, Moorfields Eye Hospital, London, UK
| | - Monisha E Nongpiur
- Ocular Imaging Group, Singapore Eye Research Institute, Singapore National Eye Centre, Singapore.,Eye, Academic Clinical Program, Duke-NUS Medical School, Singapore
| | - Anna Cs Tan
- Ocular Imaging Group, Singapore Eye Research Institute, Singapore National Eye Centre, Singapore.,Eye, Academic Clinical Program, Duke-NUS Medical School, Singapore
| | - Raymond P Najjar
- Ocular Imaging Group, Singapore Eye Research Institute, Singapore National Eye Centre, Singapore.,Eye, Academic Clinical Program, Duke-NUS Medical School, Singapore
| | - Dan Milea
- Ocular Imaging Group, Singapore Eye Research Institute, Singapore National Eye Centre, Singapore.,Eye, Academic Clinical Program, Duke-NUS Medical School, Singapore
| | - Leopold Schmetterer
- Ocular Imaging Group, Singapore Eye Research Institute, Singapore National Eye Centre, Singapore.,Eye, Academic Clinical Program, Duke-NUS Medical School, Singapore.,Department of Ophthalmology, Yong Loo Lin School of Medicine, National University of Singapore and National University Health System, Singapore
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