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Diurnal Variation of Corneal Hysteresis in Patients With Untreated Primary Open Angle Glaucoma and Normal Individuals. J Glaucoma 2022; 31:891-897. [PMID: 35980846 DOI: 10.1097/ijg.0000000000002112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 07/19/2022] [Indexed: 02/04/2023]
Abstract
PRCIS Corneal hysteresis in both patients with untreated open angle glaucoma and normal individuals demonstrated significant diurnal variation independent of confounding factors and was higher in the nighttime than in the daytime. PURPOSE To investigate diurnal variations in corneal hysteresis (CH) in patients with untreated primary open angle glaucoma (POAG) and normal individuals by using an ocular response analyzer. MATERIALS AND METHODS This prospective study included 72 eyes of 53 patients with untreated POAG and 53 eyes of 47 normal individuals. Intraocular pressure (IOP) and CH were measured using Goldmann applanation tonometry (GAT) and ocular response analyzer, respectively, every 3 hours from 9:00 to 24:00. Mixed-effects models were used to determine factors associated with CH values and CH amplitude (maximum values minus minimum values) and to examine the diurnal variations in GAT IOP and CH in each group. Significant differences between time points were defined as significant variations. RESULTS The diurnal average GAT IOP and CH in patients with POAG were significantly higher and lower than those in normal individuals ( P =0.001, 0.002). In the multivariate analysis, the larger central corneal thickness was associated with larger CH values in POAG and normal eyes (both P <0.001). A larger amplitude of GAT IOP was significantly associated with a larger CH amplitude in POAG and normal eyes ( P =0.010, 0.013). CH, in both groups, showed similar significant diurnal variation and was higher in the nighttime than in the daytime, even after adjusting for confounding factors, while IOP showed an antiphase pattern. CONCLUSION CH in both untreated POAG patients and normal participants demonstrated similar diurnal variations, that is, higher at night, independent of confounding factors. These findings suggest that viscoelastic properties of the cornea may fluctuate diurnally independent of IOP.
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Fan S, Gulati V, Neely DG, Andersen A, Toris CB. Changes in Ocular Biometric Parameters Over a 24-Hour Period in Ocular Hypertensive Patients. J Ocul Pharmacol Ther 2022; 38:489-495. [PMID: 35856838 PMCID: PMC9508877 DOI: 10.1089/jop.2021.0132] [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: 01/04/2022] [Accepted: 06/05/2022] [Indexed: 11/12/2022] Open
Abstract
Purpose: To identify 24-h changes in ocular biometric parameters in subjects with ocular hypertension (OHT), and to determine if an intraocular pressure (IOP)-lowering drug alters these parameters. Methods: Thirty volunteers with OHT (58.6 ± 9.2 years of age) were enrolled in this randomized, double-masked, placebo-controlled, crossover study. Participants self-administered 0.2% brimonidine or placebo 3 times daily for 6 weeks. Measurements of seated and supine IOP, central cornea thickness (CCT), anterior chamber depth (ACD), axial length (AXL), and lens thickness were made at 8 am, 3 pm, 8 pm, and 3 am. Statistical tests were Student's 2-tailed paired t-tests or 2-way analysis of variance (ANOVA) followed by one-way ANOVA and post hoc testing. Results: Time of day had a significant effect on IOP, CCT, ACD, and AXL. In placebo-treated eyes, CCT was greater at 3 am than at any other time (P < 0.01), ACD and AXL were greater at 3 am and 8 pm than at 3 pm (P < 0.01). Daytime IOPs were higher than nighttime (seated, P = 0.007; supine, P = 0.018), and supine IOP at night was higher than seated IOP during the day (P < 0.001). Brimonidine did not lower IOP at night nor did it alter the 24-h patterns of CCT, ACD, and AXL. Conclusions: Ocular biometric parameters exhibit characteristic 24-h fluctuations in patients with OHT. At night compared with day, the supine IOP increases, the cornea thickens, the anterior chamber deepens, and the AXL increases. Brimonidine does not alter these parameters at times when it lowers IOP (day) nor when it does not (night). Clinical Trial Registration number: NCT0132419.
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Affiliation(s)
- Shan Fan
- Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Vikas Gulati
- Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Donna G. Neely
- Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Austin Andersen
- Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA
| | - Carol B. Toris
- Truhlsen Eye Institute, University of Nebraska Medical Center, Omaha, Nebraska, USA
- Department of Ophthalmology and Visual Science, The Ohio State University, Omaha, Nebraska, USA
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Gene-Morales J, Gené-Sampedro A, Martín-Portugués A, Bueno-Gimeno I. Do Age and Sex Play a Role in the Intraocular Pressure Changes after Acrobatic Gymnastics? J Clin Med 2021; 10:4700. [PMID: 34682821 PMCID: PMC8541003 DOI: 10.3390/jcm10204700] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 10/10/2021] [Accepted: 10/11/2021] [Indexed: 12/15/2022] Open
Abstract
To evaluate the effects of an acrobatic gymnastics (AG) training session on intraocular pressure (IOP), a familiarization session was employed to confirm the participant's suitability for the study. Forty-nine gymnasts (63.27% females, 18-40 years old) voluntarily agreed to participate. As age, sex, baseline IOP, and central corneal thickness (CCT) were considered as potential predictors of the IOP variations, in the second session measurements of the above parameters were taken before and after 90 min of AG. A mixed-factorial analysis of variance evaluated differences. Linear regression was conducted to potentially predict the IOP variation with the exercise. After the scheduled exercise, highly significant (p < 0.001, effect size: 0.73) reductions in IOP, but no significant changes in CCT (p = 0.229), were observed. IOP was significantly modified in males, older than 25 years, and subjects with baseline IOP > 14 mmHg (p ≤ 0.001, effect sizes: 0.57-1.02). In contrast, the IOP of females, younger participants, and subjects with baseline IOP ≤ 14 mmHg was not significantly modified (p = 0.114). With the regression analyses, we concluded that both sex and baseline IOP levels were significant predictors of the IOP fluctuation with AG. These findings could be of interest for gymnasts, coaches, ophthalmologists, and/or optometrists in the prevention and control of risk factors associated with glaucoma.
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Affiliation(s)
- Javier Gene-Morales
- Research Group Prevention and Health in Exercise and Sport (PHES), University of Valencia, St. Gascó Oliag 3, 46010 Valencia, Spain;
- Research Institute on Traffic and Road Safety (INTRAS), University of Valencia, St. Serpis 29, 46022 Valencia, Spain
| | - Andrés Gené-Sampedro
- Research Institute on Traffic and Road Safety (INTRAS), University of Valencia, St. Serpis 29, 46022 Valencia, Spain
- Department of Optics, Optometry & Vision Science, University of Valencia, St. Dr Moliner 50, 46100 Burjassot, Spain;
| | - Alba Martín-Portugués
- Department of Optics, Optometry & Vision Science, University of Valencia, St. Dr Moliner 50, 46100 Burjassot, Spain;
| | - Inmaculada Bueno-Gimeno
- Department of Optics, Optometry & Vision Science, University of Valencia, St. Dr Moliner 50, 46100 Burjassot, Spain;
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Chen S, Jin Z, Zheng G, Ye S, Wang Y, Wang W, Wang Y, Zhu D, Shen M, Lu F. Diurnal variation of corneal elasticity in healthy young human using air-puff optical coherence elastography. JOURNAL OF BIOPHOTONICS 2021; 14:e202000440. [PMID: 33389817 DOI: 10.1002/jbio.202000440] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/15/2020] [Accepted: 12/30/2020] [Indexed: 06/12/2023]
Abstract
Due to the disruption of intraocular pressure (IOP) and central corneal thickness (CCT), diurnal variation in normal young human corneal elasticity is not clear. Using the custom-built air-puff optical coherence elastography, one eye of 21 normal subjects is enrolled randomly to measure the central corneal elasticity, IOP, and CCT in different time points within a day. Based on the multi-level model, the corneal elastic modulus is found to have a linear positive relation with IOP (P < .01) but not CCT (P = .175) and time point (P = .174-.686). A new indicator, corneal elasticity change rate, is proposed to present the magnitude of corneal elasticity change caused by 1 mmHg IOP, which can correct the interference effect of IOP. The results show that the corneal elasticity in the normal young human does not have the characteristics of diurnal variation under IOP control. Furthermore, IOP plays an important role in the corneal elasticity, and corneal elasticity change rate can increase the comparability of results between individuals.
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Affiliation(s)
- Sisi Chen
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Zi Jin
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
- Department of Biomedical Engineering, College of Engineering, Peking University, Wenzhou, Beijing, China
| | - Gu Zheng
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Shuling Ye
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Yiyi Wang
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Weicheng Wang
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Yuanyuan Wang
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Dexi Zhu
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Meixiao Shen
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Fan Lu
- School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, Zhejiang, China
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Corneal Biomechanical Changes Caused by Acute Elevation of IOP in Eyes with and without Glaucoma. Optom Vis Sci 2021; 98:367-373. [PMID: 33828042 DOI: 10.1097/opx.0000000000001668] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
SIGNIFICANCE Although corneal biomechanical parameters are well linked with glaucoma, their clinical utility has not yet been fully elucidated. This study was designed to provide unique evidence about the dynamic nature of corneal biomechanical parameters and their potential prognostic ability for glaucoma. PURPOSE This study aimed to evaluate the effect of acute intraocular pressure (IOP) elevation on corneal hysteresis (CH) and corneal resistance factor (CRF) and the associations of these biomechanical parameters with glaucomatous disease. METHODS Subjects participating in a prospective, longitudinal glaucoma research study had CH and CRF measured before and during ophthalmodynamometry during visits in the years 2011 to 2012. All participants were diagnosed with primary open-angle glaucoma, ocular hypertension, glaucoma suspect, or normal eyes and had a minimum of 3 years of study participation with at least five reliable visual field (VF) tests. Changes in CH, CRF, and IOP induced by ophthalmodynamometry were compared between diagnostic groups and evaluated for relationships with existing and future glaucomatous VF loss. RESULTS In 248 eyes of 248 subjects followed up for 7.7 ± 2.3 years, ophthalmodynamometry induced a mean IOP increase from 15.1 to 29.9 mmHg, causing a mean 34 ± 28% increase in CRF and 21 ± 25% decrease in CH. Magnitude of CH change did not differ between diagnostic groups or between eyes that did (n = 20) and did not (n = 95) develop new VF loss during the study period, nor was it related to rate of future VF progression. CONCLUSIONS Ophthalmodynamometry-induced IOP elevation resulted in significant acute changes in CH and CRF in this study; this suggests accounting for IOP may be important in clinical interpretation of these parameters. However, because the degree of CH change was not related to glaucoma or its progression, acute changes in CH and CRF do not seem to have a prognostic value for glaucoma.
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Tañá-Rivero P, Aguilar-Córcoles S, Ruiz-Mesa R, Montés-Micó R. Repeatability of whole-cornea measurements using a new swept-source optical coherence tomographer. Eur J Ophthalmol 2020; 31:1709-1719. [PMID: 32686488 DOI: 10.1177/1120672120944022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
PURPOSE The aim of this study was to evaluate the repeatability of several corneal parameters provided by a high-resolution swept-source optical coherence tomographer (SS-OCT). METHODS One eye from each of 74 patients was measured five times consequently using the ANTERION SS-OCT. The following corneal parameters were analyzed: average, steep and flat keratometry (K), astigmatism for anterior, posterior and total at 3-mm, average K and astigmatism at 6-mm, anterior and posterior eccentricity, higher-order aberrations (HOA) and spherical aberration (Z40), and anterior and posterior best-fit sphere at 8-mm. The intrasubject standard deviation (Sw), coefficient of variation (CoV), coefficient of repeatability (CoR) and intraclass correlation coefficient (ICC) were calculated for each parameter to assess the repeatability. RESULTS We have not found statistically significant differences between repeated measurements (p > 0.05). Repeatability was good considering the different metrics used. Sw values were <0.09, varying from 0.035 (posterior average K at 6-mm) to 0.0878 (anterior flat K at 3-mm). CoV values were also low and similar among the different parameters (from 0.08% to 0.21%), except for anterior, posterior and total astigmatism (from 2.25% to 8.46%). Both anterior and posterior eccentricity, and corneal aberrations (HOA and Z40) CoV values were also high. The CoR values were low for all parameters showing those related to the posterior cornea the lowest values (about 0.01). ICC values were >0.98. CONCLUSIONS The ANTERION SS-OCT showed good repeatability when reconstructed different parameters for the whole cornea. This device produces measurements with high repeatability that could be useful for clinical research.
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Affiliation(s)
| | | | | | - Robert Montés-Micó
- Oftalvist Clinic, Alicante, Spain.,Optics and Optometry & Vision Sciences Department, University of Valencia, Valencia, Spain
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Sanchez I, Martin R. Advances in diagnostic applications for monitoring intraocular pressure in Glaucoma: A review. JOURNAL OF OPTOMETRY 2019; 12:211-221. [PMID: 31405810 PMCID: PMC6978552 DOI: 10.1016/j.optom.2018.12.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 11/20/2018] [Accepted: 12/12/2018] [Indexed: 05/24/2023]
Abstract
Continuous intraocular pressure (IOP) monitoring for improving glaucoma diagnosis and treatment has remained a challenge for the past 60 years because glaucoma is the second leading cause of irreversible blindness worldwide. Several devices with different measurement principles and recently developed biosensors with semiconductor materials offer exciting properties. However, none of these devices for continuous IOP monitoring have been fully integrated into clinical practice, primarily due to technical problems. This review summarizes state-of-the-art biosensors developed for IOP monitoring by explaining their basic functions and applications, the main technology (pressure transductors, piezoresistive sensors, capacitive sensors, and resonant sensors), measurement approach (noninvasive, minimally invasive or invasive (surgically implantable)), and telemetry characteristics. To provide updated information for clinicians and researchers, we also describe the advantages and limitations of the application of these new sensors to eye care management. Despite significant improvements in IOP biosensor technology, the accuracy of their measurements must be improved to obtain a clear equivalence with actual IOP (measured in units of mmHg) to facilitate their clinical application. In addition, telemetry systems may be simplified to prevent adverse outcomes for patients and to guarantee the safety of stored data.
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Affiliation(s)
- Irene Sanchez
- Universidad de Valladolid, Departamento de Física Teórica, Atómica y Óptica, Paseo de Belén, 7, Campus Miguel Delibes, Valladolid 47011, Spain; Universidad de Valladolid, Instituto Universitario de Oftalmobiología Aplicada (IOBA), Paseo de Belén, 17, Campus Miguel Delibes, Valladolid 47011, Spain; Optometry Research Group, IOBA Eye Institute, School of Optometry, University of Valladolid, Valladolid 47011, Spain.
| | - Raul Martin
- Universidad de Valladolid, Departamento de Física Teórica, Atómica y Óptica, Paseo de Belén, 7, Campus Miguel Delibes, Valladolid 47011, Spain; Universidad de Valladolid, Instituto Universitario de Oftalmobiología Aplicada (IOBA), Paseo de Belén, 17, Campus Miguel Delibes, Valladolid 47011, Spain; Optometry Research Group, IOBA Eye Institute, School of Optometry, University of Valladolid, Valladolid 47011, Spain; School of Health Professions, Plymouth University, Plymouth PL68BH, UK
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Bueno-Gimeno I, Martínez-Albert N, Gené-Sampedro A, España-Gregori E. Anterior Segment Biometry and Their Correlation with Corneal Biomechanics in Caucasian Children. Curr Eye Res 2018; 44:118-124. [PMID: 30346843 DOI: 10.1080/02713683.2018.1539181] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
PURPOSE To assess the relationship between the corneal biomechanical parameters and the anterior segment parameters in Caucasian children. METHODS This study included 293 eyes from 293 healthy children aged between 6 and 17 years. Corneal hysteresis (CH) and corneal resistance factor (CRF) were evaluated with the Ocular Response Analyzer, axial length (AL) with IOLMaster and the anterior segment with Pentacam. Anterior segment parameters obtained were the following: central corneal thickness (CCT), corneal volume (CV), anterior chamber depth (ACD), anterior chamber volume (ACV) and mean anterior and posterior keratometry. Two multiple linear regression models were constructed to assess the association between CH and CRF with anterior segment parameters. A value of p < 0.05 was taken as the criterion for statistical significance in all analyses. RESULTS The mean CH and CRF were 12.12 ± 1.71 and 12.30 ± 1.89 mmHg, respectively. Multiple linear regression revealed that CH and CRF were associated negatively with AL in both models, and positively with CCT and CV in the first and second model, respectively. Meanwhile ACD, ACV or mean keratometry did not correlated with CH and CRF. Moreover, when CCT was in the model, it explained more variability for both CH (22.1%) and CRF (30.9%) than when CV was included (16.2% for CH and 16.5% for CRF). CONCLUSIONS CH and CRF were correlated positively with CCT and CV, and negatively with AL in healthy Caucasian children. Moreover, corneal parameters were the most contributory variables to CH and CRF changes.
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Affiliation(s)
| | - Noelia Martínez-Albert
- a Department of Optics and Optometry and Vision Sciences , University of Valencia , Spain
| | - Andrés Gené-Sampedro
- a Department of Optics and Optometry and Vision Sciences , University of Valencia , Spain
| | - Enrique España-Gregori
- b Department of Surgery , University of Valencia , Spain.,c University Hospital La Fe , Spain
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Lanza M, Rinaldi M, Carnevale UAG, di Staso S, Sconocchia MB, Costagliola C. Analysis of differences in intraocular pressure evaluation performed with contact and non-contact devices. BMC Ophthalmol 2018; 18:233. [PMID: 30176825 PMCID: PMC6122572 DOI: 10.1186/s12886-018-0900-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2018] [Accepted: 08/24/2018] [Indexed: 11/10/2022] Open
Abstract
Background To evaluate differences of intraocular pressure (IOP) measurements performed with Goldmann applanation tonometer (GAT), dynamic contour tonometer (DCT), rebound tonometry (RT), Ocular Response Analyzer (ORA) and Corvis ST (CST) in eyes screened for refractive surgery. Methods One eye, only the right one, of 146 patients was included in this study. Each participant was submitted to a corneal analysis with Scheimpflug camera and IOP evaluation with GAT, DCT, RT, ORA and CST. Differences in IOP values obtained thanks to each instruments were compared and then correlations between these discrepancies and morphological features such as mean keratometry (MK) and central corneal thickness (CCT) provided by Pentacam were studied. Software used to run statistical evaluations was SPSS, version 18.0. Results Study participants had a mean age of 33.1 ± 9.2 years old. IOP values observed in this study were 15.97 ± 2.47 mmHg (GAT), 17.55 ± 2.42 mmHg (DCT), 17.49 ± 2.08 mmHg (RT), 18.51 ± 2.59 mmHg (ORA) and 18.33 ± 2.31 mmHg (CST). The mean CCT was 560.23 ± 31.00 μm, and the mean MK was 43.33 ± 1.35 D. GAT provided significant lower values in comparison to all other devices. DCT and RT gave significantly lower intermediate IOP values than those measured with ORA and CST. All the IOP measures and the differences between devices were significantly correlated with CCT. Conclusions According to our data, although our findings should be confirmed in further studies, GAT tonometer cannot be used interchangeably with DCT, RT, ORA and CST.
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Affiliation(s)
- Michele Lanza
- Multidisciplinary Department of Medical, Surgical and Dental Sciences, Università della Campania, Luigi Vanvitelli, Via de Crecchio 16, 80100, Naples, Italy.
| | - Michele Rinaldi
- Multidisciplinary Department of Medical, Surgical and Dental Sciences, Università della Campania, Luigi Vanvitelli, Via de Crecchio 16, 80100, Naples, Italy
| | - Ugo Antonello Gironi Carnevale
- Multidisciplinary Department of Medical, Surgical and Dental Sciences, Università della Campania, Luigi Vanvitelli, Via de Crecchio 16, 80100, Naples, Italy
| | - Silvio di Staso
- Ophthalmology Unit, Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy
| | - Mario Bifani Sconocchia
- Multidisciplinary Department of Medical, Surgical and Dental Sciences, Università della Campania, Luigi Vanvitelli, Via de Crecchio 16, 80100, Naples, Italy
| | - Ciro Costagliola
- Department of Medicine and Healthy Sciences, Università del Molise, Campobasso, Italy
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Martínez-Albert N, Esteve-Taboada JJ, Montés-Micó R. Repeatability of whole-cornea measurements using an anterior segment imaging device based on OCT and Placido-disk. Expert Rev Med Devices 2017; 14:169-175. [DOI: 10.1080/17434440.2017.1281739] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Noelia Martínez-Albert
- Optometry Research Group (GIO), Department of Optics and Optometry and Vision Sciences, University of Valencia, Burjassot, Spain
| | - José J. Esteve-Taboada
- Optometry Research Group (GIO), Department of Optics and Optometry and Vision Sciences, University of Valencia, Burjassot, Spain
| | - Robert Montés-Micó
- Optometry Research Group (GIO), Department of Optics and Optometry and Vision Sciences, University of Valencia, Burjassot, Spain
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Abstract
PURPOSE To evaluate the effect of ocular biometrics on intraocular pressure (IOP) and diurnal IOP fluctuation in nonglaucomatous subjects. METHODS We examined 115 subjects from May to December 2007 in Kangbuk Samsung Hospital, Seoul, Korea. Intraocular pressure was measured with a Goldmann applanation tonometer in habitual positions every 2 hours from 9 am to 11 pm. Ocular biometric values including central corneal thickness, central corneal power, axial length, anterior chamber depth, and lens thickness were measured using an ultrasound biometer and keratometer and the refractive state was determined. RESULTS Two hundred fourteen eyes of 115 patients were included in this study; the mean (±SD) IOP of all eyes was 12.33 (±2.55) mmHg. The mean (±SD) diurnal IOP fluctuation was 2.72 (±1.43) mmHg. Central corneal thickness was positively correlated with the mean IOP (Pearson correlation, r = 0.217, p = 0.002); however, there was no relationship between central corneal thickness and the diurnal IOP fluctuation. Axial length was not related to the mean IOP (Pearson correlation, r = 0.049, p = 0.476) and the diurnal IOP fluctuation (Pearson correlation, r = 0.058, p = 0.395). The mean IOP or diurnal IOP fluctuation was not related to any of the following values: central corneal power, anterior chamber depth, refractive error, lens thickness, or vitreous chamber depth. CONCLUSIONS Central corneal thickness is significantly related to the IOP but may not affect diurnal IOP fluctuation. The axial length was not associated with IOP profiles in this study. Our results can contribute to a broader understanding of the effects of ocular biomechanical properties on the IOP profile.
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