익상편 절제술 후 익상편의 크기 지표에 따른 평균 각막 굴절력 변화량 예측

초록

Purpose: To assess the changes in mean corneal refractive power (ΔK) following pterygium surgery and to predict ΔK in casesof combined cataract and pterygium surgery. Methods: Thirty-seven eyes of unilateral pterygium patients who underwent pterygium surgery were analyzed retrospectivelywith at least more than 1 month of follow-up. Preoperative and postoperative 1 month corneal refractive power was measuredusing auto-keratometer (RK-F1, Canon, Tokyo, Japan). Pterygium horizontal extension, width, and area were measured andcorrelation with ΔK before and after surgery analyzed. We also compared ΔK of the contralateral normal eye. Results: The mean corneal refractive (Km) power measured before and 1 month after surgery was 43.30 ± 1.66 D and 44.07 ±1.42 D, respectively. The Km significantly increased at 4 weeks after surgery (p < 0.001). However, postoperative Km was notsignificantly different when compared with the contralateral normal eye (43.86 ± 1.34 D; p = 0.59). All parameters of pterygiumsize including horizontal extension, width, and area were positively correlated with the mean ΔK. Among parameters, horizontalextension was best correlated with mean ΔK (p < 0.001). The mean ΔK with horizontal extension was predicted using linear regression(2.5 mm to 1 D, 4.0 mm to 1.8 D). Conclusions: We recommend contralateral corneal refractive power or prediction of corneal refractive power using linear regressionwith pterygium horizontal extension for determining intraocular lens power in cases of combined cataract and pterygiumsurgery.

키워드