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Objectives To report the distribution of intraocular pressure (IOP) by age and sex and the prevalence of glaucoma.

Design Community based cross sectional observational study.

Setting EPIC-Norfolk cohort in Norwich and the surrounding rural and urban areas.

Participants 8623 participants aged 48-92 recruited from the community who underwent ocular examination to identify glaucoma.

Main outcome measures Prevalence and characteristics of glaucoma, distribution of IOP, and the sensitivity and specificity of IOP for case finding for glaucoma.

Results The mean IOP in 8401 participants was 16.3 mm Hg (95% confidence interval 16.2 mm Hg to 16.3 mm Hg; SD 3.6 mm Hg). In 363 participants (4%), glaucoma was present in either eye; 314 (87%) had primary open angle glaucoma. In the remaining participants, glaucoma was suspected in 607 (7%), and 863 (10.0%) had ocular hypertension. Two thirds (242) of …