Treatment of corneal astigmatism by limbal relaxing incisions during phacoemulsification surgery

M. Naguib, Hussam-Eldin O Elrashidy, G. Samir
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Abstract

Background and aim The aim was to assess the effectiveness of limbal relaxing incisions (LRIs) in treatment of astigmatism in patients undergoing phacoemulsification surgeries. Patients and methods Forty-eight eyes of 48 patients suffering from senile cataracts of mean age 64.7±7.9 (range: 50–77) years, and mean corneal astigmatism 1.8±0.73 diopters (D) (range: 1.5–3.5 D) were included in this study. All LRIs were performed at the end of phacoemulsification. Corneal topography results were compared before surgeries and 2 and 6 months after surgeries. Results A statistically significant reduction in the mean corneal astigmatism was seen from 1.8±0.73 D (range: 1.50–3.50) preoperatively to 1.1±0.24 D (range: 0.5–1.7) and 1.4±0.52 D (range: 0.60–1.9) in the second and sixth postoperative months, respectively (P<0.001). Surgical-induced astigmatism (the amount and axis of astigmatism change induced by surgery) was 0.90±0.48 at 2 months and 0.96±0.59 at 6 months. Correction index (calculated by determining the ratio of surgical-induced astigmatism/target-induced astigmatism) was 0.56±0.42 and 0.57±0.33 at 2 and 6 months, respectively. Index of success (ratio of topographic residual astigmatism and target-induced astigmatism) was measured to be 0.45±0.42 and 0.48±0.33 at months 2 and 6 correspondingly. Conclusion Combined LRI and phacoemulsification appears to be safe and fairly effective to correct mild-to-moderate corneal astigmatism. However, undercorrection is a common limitation that may be further managed by modified nomograms in future studies.
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超声乳化术中角膜缘松弛切口治疗角膜散光
背景与目的评价角膜缘松弛切口(LRIs)治疗超声乳化术患者散光的效果。患者与方法48例老年性白内障患者48只眼,平均年龄64.7±7.9岁(范围:50 ~ 77岁),平均角膜散光1.8±0.73屈光度(D)(范围:1.5 ~ 3.5 D)。所有LRIs均在超声乳化术结束时进行。比较术前与术后2、6个月角膜地形图结果。结果术后2、6个月平均角膜散光由术前的1.8±0.73 D(范围:1.50 ~ 3.50)降至1.1±0.24 D(范围:0.5 ~ 1.7)、1.4±0.52 D(范围:0.60 ~ 1.9),差异有统计学意义(P<0.001)。手术引起的散光(手术引起的散光量和散光轴变化)2个月时为0.90±0.48,6个月时为0.96±0.59。2个月和6个月校正指数(通过测定手术性散光/靶性散光的比值计算)分别为0.56±0.42和0.57±0.33。第2个月和第6个月的成功指数(地形残余散光与靶致散光的比值)分别为0.45±0.42和0.48±0.33。结论LRI联合超声乳化术治疗轻、中度角膜散光安全有效。然而,校正不足是一个常见的限制,在未来的研究中可以通过修改的图来进一步管理。
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审稿时长
34 weeks
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