It is generally accepted that Korean eye looks smaller than Western eye and double-folded eye looks bigger than single-folded eye. The upper eyelid covers 1 to 2 mm of the cornea in Caucasians, but fewstudy of the criteria of Koreans has been
described.
Therefore, so far, the criteria of Caucasian eyelid has been used for the treatment of blepharoptosis. And, there has been no literature about the reason why double-folded eye looks bigger than single eye.
The purpose of this study is to determine the normal upper eyelid covering-level of limbus of cornea, the width and height of palpabral fissure, diameter of the cornea and MRDI(Margin Reflex Distance 1), measured from 202 korean adults in their
twenties.
@ES The results are as follows:
@EN 1) The width of palpabral fissure is 29.1±1.1mm and the height is 7.8±1.2mm.
2) The horizontal diameter of cornea is 11.9±0.4mm and the vertical is 11.2±0.4mm.
3) The corneal coverage of upper cyelid is 3.1±0.9mm and that of lower lid is 0.3±0.5mm.
In group with double fold, upper eyelids cover 2.7±0.9mm of the cornea. In group that has single eyelid, those cover 4.0±0.9mm
4) . The MRDI is 2.4±1.0mm.
In conclusion, the value of corneal coverage by upper eyelid among Koreans is 3.1mm, which is significantly different from 1 to 2mm of Caucasians. So, we must correct the criteria of diagnosis and operation on blepharoptosis among Koreans. The
upper lid
covers the cornea in single eyelid more than double eyelid and the double fold operation may increase actual palpabral fissure height.
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