Question: what is the difference between double and single eyelids?
Answer: Single eyelids showed slightly thicker SOOC in the pre-tarsal area and at the eyelid crease but not 5 mm above the eyelid crease. ... Double eyelid can then be subcategorized based on eyelid crease morphology. Eyelid crease formation or the differences between single and double eyelid anatomy remain an unsolved question.