Eyelid malformation in four cockatiels.
Four unrelated cockatiels had various degrees of maldevelopment of the eyelids. Only 1 eye of the 8 was normal. The condition had features compatible with ankyloblepharon or cryptophthalmos. Attempts were made to surgically establish an artificial palpebral fissure. Despite extensive surgical intervention and postoperative topical administration of corticosteroids, the skin over the orbit reverted to the preoperative state in all birds. Anecdotal information along with our findings suggest that this condition, although uncommon, is widespread in the cockatiel population in the United States.