Gonioscopic differences between primary open-angle glaucoma and normal subjects over 40 years of age.

Gonioscopy was performed on 110 patients with primary open-angle glaucoma over 40 years of age and an equal number of normal sugjects, matched by race and age. The frequency distribution of various angle features differed in the two groups: in the glaucoma group, there were more iris processes at all levels of insertion, a higher insertion of the iris root and more trabecular pigmentation. A congenital angle anomaly is one important factor in the pathogenesis of the elevated pressure.