Pham D T, Volkmer C, Leder K, Wollensak J
Augenklinik, Charité.
Ophthalmologe. 1998 Sep;95(9):635-8. doi: 10.1007/s003470050327.
We perform partial sphincterectomy during cataract surgery in cases with very small pupil (< 3 mm). We assume that the small pupil is mainly due to a fibrosis ring of the sphincter muscle.
In 35 patients we performed the complete ophthalmological routine checkup. The pupil diameter was analysed by perimeter: a base value, with light, and in pharmaceutical mydriasis. Moreover 15 preparations were analysed histologically.
Average pupil diameter was: base value 3.76 mm, with light 3.24 mm, in pharmaceutical mydriasis 4.84 mm. The showed pathohistological examination that in all excisions a part of the sphincter muscle was verifiable. We found fibrosis of different grades in various locations.
In most cases functional pupil movement can be verified after operation. In an intended partial sphincterectomy part of the sphincter muscle can be excised. The different pupil diameter is due to the different degree of fibrosis of the sphincter muscle.
对于瞳孔非常小（<3毫米）的病例，我们在白内障手术期间进行部分括约肌切除术。我们认为小瞳孔主要是由于括约肌的纤维化环所致。
我们对35例患者进行了完整的眼科常规检查。通过视野计分析瞳孔直径：基础值、光照下以及药物散瞳后的数值。此外，对15份标本进行了组织学分析。
平均瞳孔直径为：基础值3.76毫米，光照下3.24毫米，药物散瞳后4.84毫米。病理组织学检查显示，在所有切除标本中均可证实有部分括约肌。我们在不同位置发现了不同程度的纤维化。
在大多数情况下，术后可证实瞳孔有功能性活动。在预期的部分括约肌切除术中，可以切除部分括约肌。不同的瞳孔直径是由于括约肌纤维化程度不同所致。
