Aim: Prevalence and risk factors associated with primary open angle glaucoma in diabetic patients in a tertiary care centre. Methods: This Cross sectional study was done in the Department of Ophthalmology, Narayan Medical College & Hospital, Sasaram, Bihar, India. All documented diabetic cases attending Department of Ophthalmology giving consent for work up for the study, IOP > 21 mmHg (by Schiotz tonometry) with visual field defects, IOP > 21 mmHg (by Schiotz tonometry) with optic nerve head changes,Optic nerve head changes with visual field defects and Normal IOP with no visual field defects or optic nerve head changes, with asymmetry of IOP in both eyes of > 5 mmHg were included in this study.