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Vertical coma is a significant sign of corneal, lens and IOL pathology

Poster Details

First Author: A.Varavka RUSSIA

Co Author(s):    A. Kachanov   S. Bauer   B. Zimin              

Abstract Details


To estimate and compare corneal, lens and IOL aberrations in eyes with keratoconus, mild cataract, lens subluxation and IOL decentration by using PENTACAM and WASCA abberometry.


Sv. Fyodorov "Eye Microsurgery” clinic, St.-Petersburg Branch, 21 Yaroslav Gashek Str., St.-Petersburg, 192283, Russia.


We studied wavefront aberrations, corneal topography other parameters in eyes with keratoconus, lens subluxation, corneal scars, mild cataract and IOL decentration. All ophthalmic examinations included standard methods and WASCA Hartmann Shack aberrometry (“Carl Zeiss Meditec”) with Scheimpflug camera Pentacam (“OCULUS”) corneal aberrometry.


We revealed vertical coma increasing in eyes with keratoconus (primary and iatrogenic), mild cortical cataract, lens subluxation, corneal scars and IOL decentration. Vertical positive coma is a very important sign of optical decentrations in some parts of eye. Positive vertical coma Z (3,1) (WASCA) and e3 (Pentacam) become more than 0,6 microns in Hartmann-Shack and Pentacam aberrometry in keratoconic eyes and eyes with lens subluxation. Combination and comparison of two methods of corneal aberrometry allow to distinguish corneal and lens distribution of aberrations in human eye.


We have to take into account corneal aberrations and especially vertical positive coma (Zernike polinomia Z (3,1) in Hartmann-Shack aberrometer and e3 in PENTACAM to diagnose keratoconus and lens subluxation accurately.

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