Thickness of Korean upper eyelid skin at different levels

This study aims at elucidating the thickness of the Korean upper eyelid at different levels. Left eyelids of 10 (9 males and 1 female) fresh Korean cadavers were dissected. Full thickness upper eyelids were cut and trichrome stained. The thickness was measured under a microscope.The thickness of upper eyelid skin varied at different levels. The thickest part of the upper eyelid is just below the eyebrow (D) (1.127 +/- 238 microm), and the thinnest skin is near the ciliary margin (A) (320 +/- 49 microm). The upper tarsal area (C) and mid tarsal area (B) are 832 +/- 213 and 703 +/- 103 microm, respectively. "A" area was significantly thinner than mid tarsal "B" area (P = 0.000). The skin above the tarsus was thicker than the "B" area, but there was no significant difference (P = 0.081). The skin just below the eyebrow, "D," was thicker than the upper tarsal border, "C" area (P = 0.011). The epidermis accounted for 11.2% of the entire skin near the ciliary margin. However, epidermis presented less (4.2-5.5%) of the whole skin at other levels (P = 0.000). The distance between ciliary margin and the point where the skin turns suddenly thicker was 1.89 +/- 0.23 mm. The size of the tarsal plate was 8.88 +/- 0.81 mm. These data of upper eyelid skin thickness may apply to Asian double fold surgery and also to full thickness skin donation for grafting.