Differences Between Single and Double Eyelid Anatomy in Asians Using Ultrasound Biomicroscopy

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Abstract

Purpose

The aim of this study was to clarify the differences between single and double eyelid structures quantitatively using an ultrasound biomicroscopy.

Methods

Upper eyelids of Asian volunteers were evaluated with a 50-MHz ultrasound biomicroscopy. The skin–orbicularis oculi complex (SOOC), levator aponeurosis, Mueller muscle–conjunctival complex, and tarsus were imaged at the eyelid crease level in double eyelid group and at 7 mm above the eyelid margin in single eyelid group. The SOOC was also measured at 2 mm above the eyelid margin and 5 mm above the eyelid crease.

Results

Forty-two upper eyelids of 42 subjects were studied. The mean SOOC thickness at the eyelid crease was 0.62 ± 0.12 mm in single eyelid and 0.57 ± 0.08 mm in double eyelid (P = 0.03). The mean SOOC thickness at 2 mm above the eyelid margin and 5 mm above the eyelid crease was not significantly different between single eyelid and double eyelid (P = 0.004 and P = 0.62, respectively). The levator aponeurosis, Mueller muscle–conjunctival complex, and tarsus were measured 0.38 ± 0.12 mm, 0.86 ± 0.28 mm, and 10.84 ± 1.10 mm in single eyelid and 0.39 ± 0.14 mm, 0.88 ± 0.34 mm, and 10.61 ± 1.36 mm in double eyelid (P = 0.75, P = 0.81, and P = 0.54, respectively).

Conclusions

Single eyelid shows slightly thicker SOOC both in pre-tarsal area and at the eyelid crease but not at 5 mm above the eyelid crease level. The levator aponeurosis, Mueller muscle–conjunctival complex, and tarsus were found no different in thickness.

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