Methodology and Rationale for Ophthalmic Examinations in the Seventh and Eighth Korea National Health and Nutrition Examination Surveys (2017–2021)

Abstract

This report provides a detailed description of the methodology for ophthalmic examinations according to the Korea NationalHealth and Nutrition Examination Survey (KNHANES) VII and VIII (from 2017 to 2021). The KNHANES is a nationwide surveywhich has been performed since 1998 in representatives of whole Korean population. During the KNHANES VII and VIII, in additionto the ophthalmic questionnaire, intraocular pressure measurement, visual field test, auto refractometry, axial length and optical coherence tomography measurements were included. This new survey will provide not only provide normativeand pathologic ophthalmic data including intraocular pressure, refractive error, axial length, visual field and precise measurementof anterior segment, macula and optic nerve with optical coherence tomography, but also a more accurate diagnosisfor major adult blindness diseases, including age-related macular degeneration, diabetic retinopathy, glaucoma, and otherocular diseases, for the national Korean population.