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Comparison of the effect of eye rubbing in keratoconus and normal eyes using Scheimpflug analysis and ocular response analyzer

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Session Details

Session Title: Presented Poster Session: Cornea: Medical

Venue: Poster Village: Pod 2

First Author: : M.Henriquez PERU

Co Author(s): :    L. Izquierdo Jr   M. Cerrate   M. Hadid   L. Canola-Ramirez   C. Maldonado   J. Chauca        

Abstract Details


To compare the effect of eye rubbing on Scheimpflug imaging parameters and corneal biomechanics on keratoconus and normal eyes.


Instituto de Ojos Oftalmosalud - Research Department


Prospective cohort study including 31 normal eyes and 31 keratoconus eyes that attend to the Institution between January 2017 and November 2017. Patients performed standardized eye rubbing during 2 minutes; pre and immediately after eye rubbing, the tests were taken in minute 1, 7 and 14. More than 25 parameters from the Pentacam HR (Oculus GmBH, Wetzlar, Germany) derivatives of the curvature, elevation and pachymetry maps and 6 parameters from the Ocular Response Analyzer (ORA, Reichert Ophthalmic Instruments, Depew, NY) were measured and compared between normal and keratoconus eyes. Statistical analysis was performed using Stata 13.


In the normal group pre versus 7 minutes post eye rubbing mean change on Maximum keratometry (Kmax), Posterior elevation at the thinnest point (PE), Central Corneal Thickness (CCT), corneal hysteresis (CH), Goldman-correlated intraocular pressure (IOPG), were 0.04 +/-0.36 Diopters (D), -0.20 +/- 2.9 um, 0.10 +/- 9.01 um, -0.22 +/-1.27 seg, -0.83 +/-2.6 mmHg; in the keratoconus group pre versus post 7 minutes after eye rubbing mean change were -0.24 +/- 0.6 D, -2.35 +/- 12.89 um, -3.84 +/-11.26 um, -0.02 +/- 1.01 and -1.33 +/- 1.40 mmHg respectively. There was significant decrease in the pachymetry of keratoconus eyes (p=0.011).


Both normal and keratoconus group had significant changes in the intraocular pressure after eye rubbing. Only keratoconus group had a significant decrease in the pachymetry after eye rubbing and experienced greater variability on the changes in the keratometry and elevation parameters when compared with normal eyes.

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