Strenn K, Menapace R, Vass C
University Eye Hospital, Vienna, Austria.
J Cataract Refract Surg. 1997 Dec;23(10):1543-7. doi: 10.1016/s0886-3350(97)80027-2.
To quantify the dynamics of capsular bag shrinkage after cataract surgery.
University Eye Hospital, Vienna, Austria.
Nineteen eyes in 13 patients had clear corneal cataract surgery with implantation of a foldable, open-loop, silicone posterior chamber intraocular lens (IOL) (AMO SI-30). At the same time, an open, poly(methyl methacrylate) capsule tension ring (Morcher type 14 or 14A) was inserted to allow measurement of capsular bag circumference and diameter. After surgery, capsular bag shrinkage was quantified by measuring anterior chamber depth (ACD), iris-lens distance (ILD), and distance between the eyelets of the capsule tension ring using optical methods. Capsular bag circumference (CBC) was deduced from these measurements, which were taken 1 day (baseline), 1 week, and 1 and 3 months postoperatively.
Between 1 day and 3 months, all three parameters decreased significantly. During the first postoperative week, ACD and ILD did not change, while both parameters decreased between 1 week and 1 month. After 1 month, ACD did not decrease further; ILD continued to decrease. The CBC decreased during the entire postoperative period.
Besides ACD and ILD, CBC significantly decreased during the first 3 months after cataract surgery with in-the-bag posterior chamber IOL implantation. The CBC can be calculated from the distance between the ends of the capsule tension ring, which can be measured gonioscopically. From this, the diameter of the capsular bag can be calculated in the living eye. The influence of the capsule tension ring itself on capsular bag shrinkage remains to be established.
量化白内障手术后囊袋收缩的动态变化。
奥地利维也纳大学眼科医院。
13例患者的19只眼接受了透明角膜白内障手术，植入了可折叠、开环式硅胶后房型人工晶状体（IOL）（AMO SI - 30）。同时，插入一个开放式聚甲基丙烯酸甲酯囊袋张力环（Morcher 14型或14A型），以测量囊袋周长和直径。术后，通过光学方法测量前房深度（ACD）、虹膜 - 晶状体距离（ILD）和囊袋张力环小孔之间的距离，对囊袋收缩进行量化。根据术后1天（基线）、1周、1个月和3个月时的这些测量结果推算囊袋周长（CBC）。
在1天至3个月期间，所有三个参数均显著下降。术后第一周，ACD和ILD未发生变化，而这两个参数在1周和1个月之间下降。1个月后，ACD未进一步下降；ILD继续下降。CBC在整个术后期间均下降。
除了ACD和ILD外，在植入后房型IOL的白内障手术后的前3个月内，CBC也显著下降。CBC可根据囊袋张力环两端之间的距离计算得出，该距离可通过前房角镜测量。由此，可以计算出活体眼中囊袋的直径。囊袋张力环本身对囊袋收缩的影响仍有待确定。
