Nuclear sclerosis is an age-related change in the density of the crystalline lens nucleus that occurs in all older animals.
Although nuclear sclerosis may describe a type of early cataract in human medicine,[2] in veterinary medicine the term is also known as lenticular sclerosis and describes a bluish-grey haziness at the nucleus that usually does not affect vision, except for unusually dense cases.
Immature senile cataract has to be differentiated with nuclear sclerosis while making its diagnosis.
[3] In veterinary practice, nuclear sclerosis is a consistent finding in dogs greater than six years old.
The condition is differentiated from other types of cataract by its clinical appearance, by shining a penlight into the eye (retroillumination).