Abstract
Eyelashes can greatly influence the overall impression of facial features. However few detailed examinations of eyelashes in Japanese individuals have been published. The aim of the present study is clarify the characteristic of eyelashes of Japanese individuals mainly in their 20s. Data were collected from 50 healthy volunteers with no eyelash abnormalities. The length, density, form, and angle of the eyelashes were examined. Mean eyelash lengths in males and females were 7.33 ± 0.83 mm and 7.47 ± 0.68 mm, respectively, for the upper eyelids, and 4.98 ± 0.75 mm and 5.56 ± 0.60 mm, respectively, for the lower eyelids. Eyelash density showed a mean of 12.12 ± 2.04 and 15.24 ± 4.18 for the upper eyelids, and 5.80 ± 1.76 and 6.24 ± 1.16 for the lower eyelids. With regard to the form of the eyelashes on the upper eyelids, 10 (40%) were curly and 15 (60%) were straight in males, whereas 19 (76%) were curly and 6 (24%) were straight in females. All lower eyelid eyelashes were curly. Mean angles of the eyelashes in males and females were 61.4° ± 13.7° and 71.8° ± 13.5° for the upper eyelids, and 90.0° ± 10.1° and 99.8° ± 10.8° for the lower eyelids. Mean values obtained from the this study could be used as baseline values for eyelash reconstruction or treatment for eyelash hypotrichosis, and pertaining to eyelash morphology represent one of a few assessments of eyelash characteristics in Japanese adults of both sexes.
Highlights
Eyelashes can greatly affect the overall impression of facial features, and especially for women, represent something that can be enhanced by makeup to alter one’s features a fair bit
No significant difference was found in the length of eyelashes on the upper eyelids by sex, but females had significantly longer eyelashes on the lower eyelids, and their upper eyelashes were significantly longer than their lower eyelashes (Table 1, Figure 3)
No significant difference by short moderate long sex was found in the length of eyelashes on the upper eyelids, females had significantly longer eyelashes on the lower eyelids
Summary
Eyelashes can greatly affect the overall impression of facial features, and especially for women, represent something that can be enhanced by makeup to alter one’s features a fair bit. Eyelashes are found on both upper and lower eyelids, but the length and density of these vary widely by ethnicity. Ethnic and individual variation in the density and length of eyelashes can greatly influence one’s appearance [1,2]. East Asian (including Japanese) individuals tend to have shorter eyelashes of a lower density relative to those in Caucasian or West Asian individuals, but few detailed examinations of eyelashes in Asian individuals have been published. The present study targeted Japanese individuals primarily in their 20s, and measured the form, length, and angle of normal eyelashes. We used a questionnaire to survey how these individuals perceive their own eyelashes
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