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Comparison of biomechanical properties in keratoconus, keratoconus suspect and normal eyes with ocular response analyzer

Session Details

Session Title: Corneal biomechanics

Session Date/Time: Tuesday 08/10/2013 | 08:00-10:30

Paper Time: 10:00

Venue: Elicium 1 (First Floor)

First Author: : M.Mohammadpour IRAN

Co Author(s): :    M. Jabbarvand   I. Etesami   Z. Yavari   F. Abdollahinia      Salgado-Borges

Abstract Details


To compare corneal biomechanical indices and their specificity among keratoconus (KCN), keratoconus suspect (KCS) and normal eyes.


Farabi eye hospital, Tehran University of Medical Sciences


In this prospective cross-sectional study , data of 160 eyes in 3 groups: normal, KCN and KCS based on clinical examinations and topography were reviewed. Corneal Hysteresis (CH) and Corneal Resistance Factor (CRF) were measured by ORA. Data analysis was done by ANOVA test.


The 3 groups consisted of 80 normal, 48 KCN and 32 KCS eyes. The mean CH measured was 7.83 ± 1.26, 10.4 ± 1.24 and 10.17 ± 1.65 mmHg in KCN, normal and KCS, respectively. The mean CRF was 6.5 ± 1.57, 9.98 ± 1.87 and 10.23 ± 1.65 mmHg in KCN, KCS and normal eyes, respectively. Mean CH and CRF were significantly different between the normal and KCN (P<0.05) however, there was no significant difference between normal and KCS.


CH and CRF can be helpful in differentiating KCN from normal eyes; however, they are not valuable for detecting keratoconus suspect which is the main concern for refractive surgery. Future studies focusing on more accurate tests for finding keratoconus suspect are still warranted.

Financial Interest:


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