三种巩膜隧道外切口超声乳化白内障吸除术后手术源性散光的动态研究

目的 比较３种不同长度巩膜隧道外切口超声乳化白内障吸除术后产生手术源性散光（ｓｕｒｇｉｃａｌｌｙ ｉｎｄｕｃｅｄ ａｓｔｉｇｍａｔｉｓｍ,ＳＩＡ）度数及方向的变化规律,并评价手术效果。方法 将１０４例（１０４只眼）白内障患者分为Ａ、Ｂ、Ｃ３组,分别以３．２、５．５及７．０ｍｍ巩膜隧道外切口施地超声乳化白内障吸除术,测定术前、术后１周、１、３和６个月的角膜曲率,运用Ｃｒａｖｙ向量分析法计算ＳＩＡ度数

A dynamic study on the surgically induced astigmatism after phacoemulsification through three different-sized scleral tunnel incisions

OBJECTIVE: To compare the changes in the values and directions of surgically induced astigmatism (SIA) after phacoemulsification with three different-sized scleral tunnel incisions and to evaluate their clinical results. METHODS: The patients were divided into three groups; the length of the scleral tunnel incision was 3.2, 5.5 and 7.0 mm respectively in A, B and C groups. Keratometry measurements were obtained preoperatively, at postoperative 1 week, 1 month and 6 months respectively. SIAs were analyzed by "Cravy vector method". The mean SIA and uncorrected visual acuity were compared among the groups up to 6 months postoperatively. RESULTS: Eyes in A group displayed significantly less mean SIA and better uncorrected visual acuity than B and C groups at 1 week postoperatively (P < 0.05), but there were no significant differences between any groups at 1 month, 3 months and 6 months postoperatively (P > 0.05). There were no significant differences in the mean SIA and uncorrected visual acuity between B and C groups throughout the whole study period (P > 0.05). CONCLUSIONS: SIAs in eyes of 3.2 mm incision group of phacoemulsification are less and more stable; a better and quicker rehabilitation of uncorrected visual acuity can be obtained in the early postoperative period.