瞳孔膜，被列入血管系统发育异常之范围中，临床极为多见。瞳孔残残膜本身无色素，其色素乃生后继发的。
目的探讨先天性较大范围永存瞳孔膜的手术治疗。
Objective To study surgical treatment of large-scale congenital persistent pupillary membrane.
聚光镜装配有瞳孔膜，那是一个有贡杆控制的快门，用来调节进入镜头系统的光量。
The condenser is equipped with an iris diaphragm, a shutter controlled by a lever which is used to regulate the amount of light entering the lens system.
人工晶状体直接取出或玻璃体切割术取出，联合前段玻璃切割、瞳孔膜或后发性白内障切除。
Other combined procedures included 3 port-vitrectomy, vitreoretinal surgery, anterior vitrectomy and extraction of pupillary membrane or after cataract by excision.
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