Entropian is the turning inward of the lid. Involutional entropian is most common and occurs as a result of ageing. It always affects the lower lid. Surgery to evert the lid is effective for all types of entropian.

Ectropian is the eversion of the lower lid associated with sagging. It is usually bilateral and is frequently found in older persons. Ectropian may be caused by relaxation of the orbicularis oculi muscle, either as a part of ageing or associated with a seventh nerve palsy. The symptoms are tearing and irritation. Surgical treatment is required to correct the lids.