Ophthalmological surgery may be used to treat coloboma and ptosis of the eye to improve vision and appearance. A common technique to treat coloboma is intraocular lens (IOL) implantation, whereby a lens is surgically inserted and adhered to the iris to improve vision and appearance. In some severe cases, in conjunction with the IOL implantation, an artificial iris may be inserted into the lens capsule to treat this condition.[18] To treat ptosis, upper eyelid blepharoplasty is used for both cosmetic and functional reasons.