normal eyelid crease landmarks in an iranian population

purpose: to measure the upper eyelid crease landmarks in an iranian population sample. methods: we studied 208 iranian subjects aged 30 to 50 years. upper eyelid crease height was measured in lateral, medial and central positions using calipers. levator function (lf) was also evaluated after exclusion of frontalis muscle function. results: mean age was 39.1±5.9 years and female to male ratio was 2.25. overall mean lf was 15.70±1.77 mm (15.56±1.69 mm in female and 16.02±1.88 mm in male subjects). overall mean lid margin medial crease distance (lmmc) was 3.84±1 mm (3.71±0.94 mm in female and 4.15±1.06 mm in male subjects); mean lid margin central crease distance (lmcc) was 7.57±1.54 mm (7.47±1.49 mm in female and 7.80±1.63 mm in male subjects) and mean lid margin lateral crease distance (lmlc) was 3.89±1.02 mm (3.82±1.03 mm in female and 4.04±1.01 mm in male subjects). there was no significant difference between men and women regarding lf, lmcc, lmlc and double crease however, lmmc was significantly greater in male subjects. conclusion: defining a normal range for upper eye lid crease dimensions in various races and different genders is helpful for cosmetic eyelid surgery.