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Detection of ectasia susceptible corneas using high order aberrations

Poster Details

First Author: D.Gatinel FRANCE

Co Author(s):    A. Saad              

Abstract Details


To investigate the application of anterior corneal and ocular aberrations in detecting mildly ectatic corneas.


Rothschild Foundation, CEROC


We retrospectively reviewed the data of 220 eyes separated into 3 groups by the Nidek Corneal Navigator System automated corneal classification software: normal (N) (n=123), Forme Fruste Keratoconus (N Topography with contralateral KC) (FFKC) (n=34) and KC (n=63). Eyes in the Normal group had documented 5 years history of non complicated LASIK surgery (preoperative wavefront data was used). Anterior corneal and ocular aberrations were obtained with the topograph- aberrometer OPD Scan II and compared using a Kruskall-Wallis test. Evaluation of these data to discriminate between the three groups was assessed using a Receiver-Operating Characteristic (ROC) curve analysis.


Corneal and Ocular tilt, vertical coma and trefoil were significantly different in the FFKC as compared to the N group. The discriminant functions between the FFKC and the N group and between the KC and the N group reached an Area under the ROC curve of 0.98 and 0.96 respectively.


Indices generated from corneal and ocular wavefront aberration terms can identify very mild forms of ectasia that may be undetected by a Placido-based neural network programs. FINANCIAL DISCLOSURE?: ... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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