Posters

Correlation between corneal topographic indices and high degree aberrations in keratoconus

Poster Details

First Author: A.Bennis MOROCCO

Co Author(s):    K. Chaymae   M. Meriem   B. Chahrazad   C. Fouad   A. Meriem   B. Idriss     

Abstract Details

Purpose:

To Study high degree optical aberrations in cases of keratoconus and their correlation with corneal topographic indices (maximum keratometry, minimum pacchymetry, and posterior elevation)

Setting:

This study is made in Ophtalmology department at HASSAN II university hospital, Fez. Morocco, SIDI MOHAMED BEN ABDELLAH university Fez Morocco

Methods:

A retrospective study of patients with keratoconus, divided into 4 groups according to the topographic classification of keratoconus. A statistical analysis to assess the correlation between the RMS coefficient values for each type of high degree optical aberration of the anterior surface of the cornea measured by Pentacam and the corneal topographic indices (maximum keratometry, minimum pacchymetry and posterior elevation)

Results:

229 patients are followed, with 61 cases of keratoconus stage 1, 78 stage 2, 57 stage 3, and 30 stage 4, According to the statistical analyzes, we note the absence of correlation between the maximum keratometry and the RMS values of high degree aberrations (HOAs), coma like and spherical aberrations in case of keratoconus stage 1, stage 2 and stage 3 (R <0.5). For stage 4 the correlation is positive in the case of spherical aberrations (R = 0.6) and no correlation in the case of coma like aberrations and HOAs aberrations. For the posterior elevation, we note the absence of correlation with all the RMS values for all stages of keratoconus (R <0.4). Same observation for the correlation between the RMS values of the aberrations studied and the minimum pacchymetry (R <0.35).

Conclusions:

In our study, the high degree aberrations of the anterior surface of the cornea measured by the scheimpflug topography and the corneal topographic indices are not correlated, which shows that the measurement of the high degree aberrations does not make it possible to assess the stage of keratoconus.

Financial Disclosure:

None