“…Involutional entropion mainly occurs in lower eyelids, and its causative factors 1 include vertical eyelid laxity with attenuation or disinsertion of the lower eyelid retractor, [2][3][4][5] horizontal eyelid laxity, including the lower tarsus, and medial and lateral canthal tendons, 3 and overriding of the preseptal orbicularis oculi muscle. 6 Jones et al 4 suggested that the origin of involutional entropion was laxity in the lower eyelid retractor, and reported a surgical method focusing on the lower eyelid retractor (the Jones procedure).…”