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Diagnostic characteristics of post-LASIK keratectasia: a proposed scoring system

Poster Details

First Author: P.Padmanabhan INDIA

Co Author(s):    S. Rachapalle Reddi                    

Abstract Details


To report the refractive, topographic, tomographic and aberrometric characteristics of Post-Lasik Ectasia (PLE), to compare these characteristics with normal post-LASIK controls and to propose a comprehensive system to grade the severity of PLE.


Department of Cornea and Refractive Surgery Clinic, Medical Research Foundation, Chennai, India.


The refraction, corrected distance visual acuity (CDVA), magnitude and location of the steepest and thinnest point on the cornea, the highest anterior and posterior surface elevation, the radius of best fit sphere, corneal asphericity and corneal aberrations were measured in cases with PLE. These were compared with corresponding parameters in a group of post LASIK eyes that did not develop ectasia. Logistic regression analysis was used to create a scoring system to grade the severity of PLE.


55 eyes of 32 patients with PLE formed the study group. 50 eyes of 50 post-LASIKpatients without PLE formed the control group. There were significant refractive, visual, topographic, tomographic and aberrometric differences between eyes with and without PLE. Of these, 5 parameters, namely, CDVA, spherical equivalent, highest posterior corneal elevation, spherical aberration and corneal asphericity were identified as significant predictors of PLE and used to create a scoring system.


PLE is characterized by significant changes in refraction, topography, tomography and aberrometry. The proposed scoring system may be useful in diagnosing, grading and monitoring PLE.

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