[Classification of eyelid and designs of the double-eyelid operation].

[OBJECTIVE] To discuss the morphological characters of eyelids and the designs of double-eyelid operation on various eyelids.

[METHODS] The classification of eyelids was named according to morphological characters of eyelids from 6847 cases. A survey of 92 cases treated by double-eyelid operation was carried out to compare the external eye morphology of pre-operation with that of post-operation.

[RESULTS] There were several types of eyelids, which were morphologically classified according to eyes' length and height, eyelid skin thickness, eyeball protrusion and eye shape, including eyelids with long and narrow eyes, eyelids with thin and soft skin, eyelids with thick subcutaneous tissue, eyelids with small and round eyes, eyelids with protruding eyeball, and eyelids with triangle eyes. The aesthetic effects of double-eyelid operation on all these types of eyelids were evaluated.

[CONCLUSION] The indication of double-eyelid operation should be considered correctly, and the design should be made according to classification of the morphological characters of eyelids. Double-eyelid operation may be not appropriate for the eyelids with small, round and protruding eyes.