The normal distribution of corneal eccentricity and its determinants in two rural areas of north and south of Iran

Heydarian, S. and Hashemi, H. and Shokrollahzadeh, F. and Yekta, A. A. and Ostadimoghaddam, H. and Derakhshan, A. and Khabazkhoob, M. (2018) The normal distribution of corneal eccentricity and its determinants in two rural areas of north and south of Iran. Journal of Current Ophthalmology, 30 (2). pp. 147-151.

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Abstract

Purpose: The aim of this study was to determine the distribution of corneal eccentricity (E-value) in a normal population and to examine related factors. Methods: In this cross-sectional study, two villages were selected in Iran using multistage cluster sampling. Selected persons were invited to have a comprehensive eye examination. Examinations in each village were performed at a specific location under standard conditions. After testing for vision and refraction and conducting the slit-lamp exam, E-value was measured with Pentacam. Results: Of the 3851 selected individuals, 3314 participated in the study. After applying the exclusion criteria, data from 2610 subjects was used in the analysis for this report. Mean E-value was 0.53 95% confidence interval (CI): 0.52 to 0.54. E-value was not significantly different between males and females. Mean E-value reduced with age from 0.60 in subjects aged 6–20 years to 0.47 in subjects older than 70 years. The hyperopic group of participants had significantly lower E-value than myopic and emmetropic ones (P < 0.001). The relationship of E-value with age, gender, and other anterior segment variables and spherical equivalent was examined in a multiple linear regression model. In multiple linear regression model, age (coef = −0.003), spherical equivalent refraction (coef = −0.005), pupil diameter (coef = 0.018), anterior chamber volume (coef = −0.001), and anterior chamber angle (coef = 0.003) significantly correlated with E-value. Conclusions: The results of this study showed that the cornea in normal populations is prolate, and the degree of prolateness varies by age, such that older age is associated with a less prolate cornea. This study showed that factors such as age and refractive errors and anterior chamber indices influence the E-value. © 2017 Iranian Society of Ophthalmology

Item Type: Article
Additional Information: Cited By :1 Export Date: 16 February 2020 Correspondence Address: Yekta, A.A.; Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical SciencesIran; email: yektaa@mums.ac.ir
Uncontrolled Keywords: Corneal eccentricity Cross sectional study Determinants Distribution adolescent adult age aged anterior eye chamber Article child correlational study cross-sectional study eye refraction female gender human Iran major clinical study male myopia normal distribution pupil refraction error rural area vision visual system parameters
Subjects: WW Ophthalmology
Divisions: Mashhad University of Medical Sciences
Depositing User: lib2 lib2 lib2
Date Deposited: 18 May 2020 07:40
Last Modified: 18 May 2020 07:40
URI: http://eprints.mums.ac.ir/id/eprint/17324

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