Background Eye measurements in Koreans have been studied extensively, but resear chers have reported widely differing values, even for the same parameters. These dis crepancies are likely due to inconsistencies in the proportions of subjects with double eyelids included in their studies. We retrospectively studied eye measurements accord ing to the presence or absence of double eyelids, and compared the results to those of previous studies. Methods We conducted anthropometric measurements of eyes in young (20-29 years) Korean women with no congenital malformation, trauma, or surgery of the eyelids. The participants were dichotomized according to the presence of double eyelids, re sulting in 116 eyes with single eyelids and 124 with double eyelids. We measured the palpebral fissure length (PFL), palpebral fissure height (PFH), margin reflex distance 1 (MRD1), intercanthal distance (ICD), interpupillary distance (IPD), outer canthal dis tance (OCD), and inclination of the palpebral fissure in each eye. Results The mean PFL was 24.1 mm in the singleeyelid group and 25.5 mm in the dou bleeyelid group. The other mean values for the two groups were as follows: PFH, 8.0 mm and 9.9 mm, respectively; MRD1, 2.8 mm and 4.1 mm, respectively; IPD, 61.6 mm and 62.8 mm, respectively; and OCD, 85.3 mm and 87.9 mm, respectively. Conclusions In the doubleeyelid group, the horizontal and vertical length of the eye was greater than in the singleeyelid group, and the mean values of IPD, OCD, PFL, PFH, and MRD1 were statistically significantly higher.