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Corneal biomechanical properties in refractive surgery candidates

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Session Details

Session Title: Corneal Biomechanics

Session Date/Time: Monday 15/09/2014 | 17:00-18:30

Paper Time: 17:36

Venue: Capital Hall A

First Author: : R.Salouti IRAN

Co Author(s): :    M. Nowroozzadeh   M. Bagheri   A. Shamsi-Gooshki   M. Zamani   M. Ghoreyshi   A. Hafrkonandeh-Fard

Abstract Details


To evaluate corneal biomechanical properties in healthy refractive surgery candidates in south Iran.


Salouti private Eye Clinic, Shiraz, Iran.


In this prospective case series, intraocular pressure, central corneal thickness, and biomechanical properties of 418 refractive surgery candidates were evaluated using the non-contact tonometer Corvis Scheimpflug Technology (Corvis ST, OCULUS, Wetzlar, Germany). Keratometry readings and manifest refraction were also recorded for each patient. Only right eyes were included in the analysis.


The mean (±SD) age of participants was 27±5 years and 29.9% were male. The mean spherical equivalent refraction was -3.6±1.6 D, the mean average keratometry was 43.7±1.3 D, and the mean keratometric astigmatism was 1.2±0.8 D. The mean intraocular pressure was 16.7±2.8 mmHg. The means (95% range) of corneal biomechanical factors were as follows: T1: 7.34 (6.58 to 8.09) ms, L1: 1.82 (1.39 to 2.25) mm, V1: 0.115 (0.045 to 0.140) m/s, T2: 20.1 (19.2 to 21.1) ms, L2: 1.33 (0.270 to 2.399) mm, V2: -0.671 (-0.970 to -0.372) m/s, T: 16.8 (15.6 to 18.1) ms, DA: 1.051 (0.856 to 1.246) mm, PD: 4.53 (2.48 to 6.59) mm, R: 7.24 (5.07 to 9.42) mm.


Reporting the normal range of corneal biomechanical factors in refractive surgery candidates of selected ethnic groups helps in determining abnormal cases, which may be more prone to unexpected surgical outcomes.

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