Association of blepharoptosis with refractive error in the Korean general population

Background/Objectives We investigated the effect of blepharoptosis on refractive errors across different age groups in Korean population. Subjects/Methods This cross-sectional study was performed with data obtained in the Korea National Health and Nutrition Examination Survey (KNHANES) from 2008 to 2012. A total of 33,103 participants were enroled in our study. Blepharoptosis was defined as a marginal reflex distance 1 (MRD1) less than 2 mm, and was diagnosed in 3,305 (9.98%) participants. Ophthalmic examinations were performed, including measurements of MRD1, spherical equivalent, and degree of astigmatism. The age range was divided into three groups: less than 20 years old; more than 20 years and less than 60 years old; and more than 60 years old. Results The mean spherical equivalent were −0.28 ± 2.23 D in the ptotic eyelids and −1.13 ± 2.30 D in the non-ptotic eyelids ( p