Nuclear sclerosis (also referred to as lenticular sclerosis) is an eye disease in old animals, such as dogs. The density of the crystalline lens nucleus changes as the animal ages. This is a common occurrence in dogs greater than six years old.1 There is an increased refractivity of the central portion of the lens of the eye because of the increased density. This produces a bilateral bluish transparent haze at the center of the lens of a middle-aged or senior animal. Veterinarians suspecting a nuclear sclerosis (and not a cataract condition) shine a penlight into the animal's eye. A reflection from the tapetum indicates nuclear sclerosis.2 Nuclear sclerosis has no known treatment at this time.
1 Sapienza, John S. (2002). "Cataracts". Proceedings of the 27th World Congress of the World Small Animal Veterinary Association.
2 Petersen-Jones, Simon M. (2003). "Conditions of the Lens". Proceedings of the 28th World Congress of the World Small Animal Veterinary Association. Retrieved 2007-03-13.