<unk>  may not significantly affect vision in the early stages. However, it does require proper evaluation and treatment for restoration of optimal vision.<unk> es usually manifest themselves during the first or second decade but sometimes later. It appears as grayish white lines, circles, or clouding of the cornea.<unk>  can also have a crystalline appearance. There are over 20<unk> es that affect all parts of the cornea. These diseases share many traits: * They are usually inherited. * They affect the right and left eyes equally. * They are not caused by outside factors, such as injury or diet. * Most progress gradually. * Most usually begin in one of the five corneal layers and may later spread to nearby layers. * Most do not affect other parts of the body, nor are they related to diseases affecting other parts of the eye or body. * Most can occur in otherwise totally healthy people, male or female.<unk> es affect vision in widely differing ways. Some cause severe visual impairment, while a few cause no vision problems and are diagnosed during a specialized eye examination by an ophthalmologist. Other<unk> es may cause repeated episodes of pain without leading to permanent loss of vision.
Corneal dystrophy
Macular corneal dystrophy
Congenital cataract
Granular corneal dystrophy
Band keratopathy
Ocular melanosis
Bullous keratopathy
Fundic gland polyposis