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Influence of refractive errors on corneal viscoelasticity

Poster Details

First Author: A.Kilavuzoglu TURKEY

Co Author(s):    A. Celebi   U. Altiparmak   C. Cosar              

Abstract Details

Purpose:

To determine the possible effects of refraction on corneal viscoelasticity.

Setting:

Cornea and refractive surgery subspecialty practice

Methods:

The spherical equivalent (SE) refractive errors of the patients who admitted for routine eye examinations were recorded.SE less than -0,50 D defined myopic group and SE more than +0.50 D defined hyperopic group.Myopic group consisted of 200 eyes of 119 patients. Hyperopic group consisted of 200 eyes of 124 patients. The corneal biomechanical properties of the patients were evaluated with Ocular Response Analyser (Reichert Ophthalmic Instruments, USA). Corneal hysteresis (CH) and corneal resistance factor (CRF) were compared between two groups. Nonpaired t tests were performed to compare the data in 2 groups. The correlations were evaluated using Pearson correlation coefficient.

Results:

Mean age, corneal compensated intraocular pressure (IOPcc) and Goldmann-correlated intraocular pressure (IOPg) of the two groups weren’t statistically different (p=0.927; p=0.064; p=0.933). Mean CH was 10.89±1.70 (6.30–15) mmHg in myopic group and 11.49±1.81 (7.20–16.80) mmHg in hyperopic group (p=0.001). Mean CRF was 10.57±1.89 (6.10–15.80) mmHg in myopic group and 11.09±1.90 (6–17.10) mmHg in hyperopic group (p=0.007). There was a significant negative correlation between CH and age; CH and IOPcc in both groups (p=0.000). There was a positive correlation between CH and mean keratometry in myopic group (p=0.000) but no correlation was found in hyperopic group (p=0.561).

Conclusions:

Corneal viscoelastic behaviour is affected by the refractive status of the eye. When compared with the myopes, hyperopes tend to exhibit increased corneal viscous damping properties.

Financial Disclosure:

NONE

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