选择性散光轴切口对白内障超声乳化术后角膜散光的影响

目的 探讨根据患者术前角膜散光不同,在不同部位选择性预设散光轴透明角膜切口行白内障超声乳化联合后房型折叠式人工晶状体植入术,对术后患者角膜散光的影响.方法 收集老年性白内障患者102例150只眼,分为选择性散光轴位的透明角膜切口(A组)、颞侧透明角膜切口(B组)和11点方位透明角膜切口(C组)3组,施行超声乳化联合折叠式人工晶状体植入术,比较术后视力及角膜散光的变化情况.结果 术后3月视力≥1.0,A组67%,B组56%,C组50%,差异有统计学意义(P＜0.01);A组术后3个月平均角膜散光低于B、C组(P＜0.05),较术前平均减少了0.32D(P＜0.05);且A组中19例术前角膜散光度≥1.00D的患者,术后3个月角膜散光度减少了0.71D(P＜0.05).术后3个月平均SLA,A组最小(P＜0.05).结论 选择在患者角膜屈光力最大轴向上行个体化的透明角膜切口,能减少患者术后角膜散光,有效控制白内障超声乳化手术源性角膜散光,进一步提高患者术后视力,尤其适用于术前角膜散光在≥1.00D的白内障患者.

Abstract：

Objective To investigate the surgically induced refractive change after phacoemulsification with selective maximum astigmatic axis clear incision. Methods Phacoemulsification was performed on 102 cases of 150 eyes with senile cataract through a clear corneal incision without suture. The changes of corneal astigmatism before and after operation in group A (incision at the maximum astigmatic axis) or B (incision at the temporal) and C (incision at the 11:00) were compared. Results Three months after the opera tion, the Best correction visual acuity more than 1.0, were 67% in group A, 56% in group B and 50% in group C (P ＜0.01). The mean postoperative astigmatism of group A decreased 0.32 D than the preoperative one (P ＜0.05) and was less than the postoperative one of group B or C. Postoperatively, the mean astigmatism of 19 patients who preoperative astigmatism more than 1.00D in group A decreased 0.71 D (P ＜0.05). Among the three groups, the mean postoperative surgically induced astigmatism (SIA) of group A was minimum (P ＜0.05).Conclusions The incision placed on the maximum astigmatic axis in phacoemulsification is worth to be recommended, because of the corneal astigmatism can be significantly reduced postoperatively, the SIA can be controlled effectively and patients can get a better visual acuity, especially to patients preoprative astigmatism more than 1.00D.

Corneal refractive analysis of phacoemulsification through selective maximum astigmatic axis clear incision

Objective To investigate the surgically induced refractive change after phacoemulsification with selective maximum astigmatic axis clear incision. Methods Phacoemulsification was performed on 102 cases of 150 eyes with senile cataract through a clear corneal incision without suture. The changes of corneal astigmatism before and after operation in group A (incision at the maximum astigmatic axis) or B (incision at the temporal) and C (incision at the 11:00) were compared. Results Three months after the opera tion, the Best correction visual acuity more than 1.0, were 67% in group A, 56% in group B and 50% in group C (P ＜0.01). The mean postoperative astigmatism of group A decreased 0.32 D than the preoperative one (P ＜0.05) and was less than the postoperative one of group B or C. Postoperatively, the mean astigmatism of 19 patients who preoperative astigmatism more than 1.00D in group A decreased 0.71 D (P ＜0.05). Among the three groups, the mean postoperative surgically induced astigmatism (SIA) of group A was minimum (P ＜0.05).Conclusions The incision placed on the maximum astigmatic axis in phacoemulsification is worth to be recommended, because of the corneal astigmatism can be significantly reduced postoperatively, the SIA can be controlled effectively and patients can get a better visual acuity, especially to patients preoprative astigmatism more than 1.00D.