[Stages of primary pupil-block chronic angle-closure glaucoma]

In China, primary pupil-block chronic angle-closure glaucoma is a blinding eye disease of high incidence in primary glaucoma, with different clinical course and features from acute angle-closure glaucoma. Based on the conditions of the anterior chamber angle, the level of IOP, the defects in optic disc and visual field, and the mechanism of IOP elevation, this morbid entity was classified into 5 stages, i.e., the preclinical, the early, the progressive, the advanced and the absolute stages, and the clinical manifestations of each stage were described. This classification may be of referential use to ophthalmologists in clinical and research work.