a vertical fold of skin over the nasal canthus; normal for Mongolian peoples; sometimes occurs in Down's syndrome

Greek epi = upon, and kanthos = corner, hence, the fold of skin over the inner angle of the upper eyelid, a normal characteristic in certain races, and a congenital anomaly in others.

A fold of skin that comes in across the inner angle of the eye, common in children with birth defects such as Down syndrome.

see Pseudo-squint.