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Prediction of corneal power change after pterygium excision

Poster Details

First Author: S.Kim SOUTH KOREA

Co Author(s):    Y. Byun   C. Im   K. Seo        

Abstract Details


To analyze and predict the mean keratometric change following pterygium excision


Prospective, observational study


This study was performed in two stages. First, 66 eyes undergoing pterygium excision were recruited, and subjects were divided into two groups based on a pterygium invasion length of 2.0 mm. Keratometric values (K) were measured before, 1 month after, and 3 months after surgery. Multiple regression analyses were used to predict the postoperative mean K using preoperative K and morphological factors. Second, the regression equation was validated in 20 eyes with pterygium ?2.0 mm in several clinics. Predictive accuracy was evaluated by comparing the calculated mean K with mean Ks of the affected or fellow eye.


Horizontal, vertical and mean Ks did not change significantly after surgery in subjects with length <2.0 mm (group 1), whereas horizontal and mean Ks changed significantly in subjects with length ?2.0 mm (group 2). In group 1, the calculated mean K was similar to the preoperative mean K of the affected or fellow eye. In group 2, the calculated mean K showed a difference of < 0.5 D in 22 of 31 eyes, and the predictive accuracy was superior to those of the affected or fellow eye ( P < .001, P= .021, respectively). This predictive accuracy was similar (75% within 0.5D) in 20 combined cataract and pterygium surgical patients in several clinics.


Pterygium exceeding 2.0 mm induced significant corneal power change after surgery. Mean K predicted from the regression analysis may be useful in simultaneous pterygium and cataract surgery. FINANCIAL DISCLOSURE?: No

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