PARTIAL SPHINCTERECTOMY IN CATARACT-SURGERY - CLINICAL AND PATHOHISTOLOGICAL RESULTS

Background: We perform partial sphincterectomy during cataract surgery in cases with very small pupil (< 3 mm). We assume that the small pup il is mainly due to a fibrosis ring of the sphincter muscle. Patients: In 35 patients we performed the complete ophthalmological routine che ckup. The pupil diameter was analysed by perimeter: a base value, with light, and in pharmaceutical mydriasis. Moreover 15 preparations were analysed histologically. Results: Average pupil diameter was: base va lue 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. Conclusion: In most cases functional pup il movement can be verified after operation. In an intended partial sp hincterectomy part of the sphincter muscle can be excised. The differe nt pupil diameter is due to the different degree of fibrosis of the sp hincter muscle.