放射状角膜切开术后残余近视眼的准分子激光角膜切削术

Excimer laser photorefractive keratectomy to correct residual myopia after radial keratotomy

目的探讨准分子激光角膜切削术（ＰＲＫ）矫治放射状角膜切开术（ＲＫ）后残余近视眼的安全性与有效性。方法应用ＣＨＩＲＯＮ公司ＴｅｃｈｏｌａｓＫｅｒａｃｏｒｌ１６型准分子激光机对１６例（２１只眼）ＲＫ后残余近视眼施ＰＲＫ，应用计算机辅助的角膜地形图对手术的有效性与安全性作客观评估。结果１６例（２１只眼）经ＰＲＫ后，裸眼视力提高４～１０行（平均７．５行）；等效球镜的屈光度下降２．５０～６．００Ｄ（平均４．７５Ｄ）；所有术眼的角膜地形图提示角膜中央呈规则圆形变扁区，角膜中央３ｍｍ直径的屈光力平均下降４．２５Ｄ。随访期内（１ａ）所有术眼无明显并发症。

ObjectiveTo explore the effectiveness and safety of excimer laser photorefractive keratectomy(PRK) for correction of residual myopia after radial keratotomy(RK).MethodsPRK using the CHIRON/Techolas Keracor 116 Type excimer laser was performed on 21 eyes of 16 patients who had undergone RK previously and had residual myopia.The effectiveness and the safety of PRK were evaluated objectively by computer assisted photokeratopography before and after PRK.Results9 mon following PRK,the uncorrected visual acuity increased from 4 lines to 10 lines(mean 7.5 lines).The spherical equivalent refraction was reduced from 2.50 D～6.00 D(mean 4.75 D).In the corneal topography,the central regions were flattened regularly and round or approximately round in shape;the mean refraction at central 3 mm region was reduced in an average of 4.25 D.No significant complications occurred during follow up 1 a.ConclusionPRK appears to be a good method to correct residual myopia after RK.