All scleral changes are significant, and usually are indicative of a vision-threatening disease. Problems of the nictitans are rarely associated with loss of the eye or loss of vision. They are, however, a common source of complaint from owners. Position abnormalities are commonly an indication of other diseases. The vast majority of corneal disease manifest clinically by a change in color or transparency.
Corneal changes are also often indicative of intraocular disease.
Uveal diseases, particularly uveitis and neoplasia, are very important causes of blindness in animals. The uveal tract is also affected secondary to corneal and scleral diseases. 17-20, retina and optic nerve pp. 63-65, label and understand diagram on pp. Pupillary light reflex deficits or anisocoria are extremely common but most often times due to mechanical lesions or variations or the iris, not CNS disorders.