Epidemiology of refractive errors in an adult European population: the Segovia study.

Purpose: To determine the prevalence of refractive errors in Segovia, Spain.

Methods: A cohort of 569 subjects was randomly selected in a stratified manner according to gender and age in a cross-sectional, population-based epidemiologic study, the target population of which was urban residents aged 40 to 79 years. All participants underwent an ophthalmic examination that included measurement of visual acuity (VA) and refraction, tonometry, anterior segment biomicroscopy, funduscopy, optic nerve head photography, and visual field testing.

Prevalence of primary open-angle glaucoma in a Spanish population: the Segovia study.

Purpose: To determine the prevalence of primary open-angle glaucoma (POAG) in Segovia, Spain.

Methods: We conducted a cross-sectional, population-based epidemiologic study, the target population of which was residents of Segovia, Spain, aged 40 to 79 years. A sample of 569 subjects was randomly selected in a stratified manner according to gender and age groups.