Optic disk size in open-angle glaucoma: The Blue Mountains Eye Study

PURPOSE: To compare optic disk size in eyes of subjects classified as norma l with the eyes of subjects with open angle glaucoma, ocular hypertension, or pseudoexfoliation syndrome in an older population-based sample. METHODS: The Blue Mountains Eye Study examined 3,654 subjects. Vertical dis k diameter was measured from stereoscopic disk photographs, and we used sph erical equivalent refraction to correct for magnification. Analyses used al l eyes in a general estimating equation model. RESULTS: Mean disk diameter was 1.556 mm in glaucomatous eyes, significantl y different (P <.05) than normal eyes (1.506 mm) and eyes with ocular hyper tension (1,494 mm) or pseudoexfoliation (1.501 mm). CONCLUSIONS: Patients with glaucoma have slightly larger optic disks than n onglaucomatous subjects. (Am J Ophthalmol 1999;128:515-517. (C) 1999 by Els evier Science Inc. All rights reserved.).