The Korea National Health and Nutrition Examination Survey (KNHANES) is a national program designed to assessthe health and nutritional status of the noninstitutionalized population of South Korea. The KNHANES wasinitiated in 1998 and has been conducted annually since 2007. Starting in the latter half of 2008, ophthalmologicexaminations were included in the survey in order to investigate the prevalence and risk factors of common eyediseases such as visual impairment, refractive errors, strabismus, blepharoptosis, cataract, pterygium, diabeticretinopathy, age-related macular degeneration, glaucoma, dry eye disease, and color vision deficiency. Themeasurements included in the ophthalmic questionnaire and examination methods were modified in the KNHANESIV, V, and VI. In this article, we provide detailed information about the methodology of the ophthalmicexaminations in KNHANES in order to aid in further investigations related to major eye diseases in South Korea.