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Correlation of anterior and posterior corneal elevation and asphericity with severity of keratoconus

Poster Details

First Author: F.Orucoglu TURKEY

Co Author(s):                  

Abstract Details


To investigate the severity of keratoconus in terms of anterior and posterior corneal elevation and asphericity


Bir Inci Eye Hospital, Istanbul, Turkey


Three-hundred and twenty seven keratoconus eyes with mean age of 31.1 9.7 years were evaluated. Anterior and posterior corneal surface elevations of the thinnest point and anterior-posterior corneal asphericity of 8 mm central cornea were measured using Scheimpflug tomographic analysis. The data correlated with keratoconus severity index (Pentacam®-derived Amsler - Krumeich stages).


Anterior best fit sphere showed significant positive correlations with keratoconus severity whereas, anterior corneal assphericity showed significant negative correlations with keratoconus severity ( Pearson correlation coefficient, r=0.686; P<0.001 and r=-0.596:P<0.001). Posterior best fit sphere showed low correlation with keratoconus severity ( r=0.303; P<0.001). There were no significant correlation between posterior asphericity and keratoconus severity.


Anterior corneal surface height and asphericity had the strongest correlation with topographic keratoconus grading and should be considered an additional factor in keratoconus grading. FINANCIAL INTEREST: NONE

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