Aniridia is a rare congenital condition characterized by the incomplete or lack of formation of the eye’s iris. The word Aniridia means “without iris.” The condition usually occurs in both eyes, and can occur in varying degrees. Aniridia is also often associated with poor development of the retina at the back of the eye, preventing vision from developing normally.  Aniridia does not always cause lack of vision, but usually leads to a number of complications with the eye, including early cataracts, corneal disease and glaucoma.