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

Purpose:

To analyze and predict the mean keratometric change following pterygium excision

Setting:

Prospective, observational study

Methods:

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.

Results:

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.

Conclusions:

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