Not only must we as clinicians be able to characterize each cataract in order to manage it properly, but also we must be able to differentiate cataracts from their imposter, lenticular or "nuclear" sclerosis, a common and normal age-related change that can mimic cataracts in appearance but likely doesn't disrupt vision.

Nuclear sclerosis becomes apparent in dogs and cats around the age of 7. Breed and gender are not thought to play a role in the development of nuclear sclerosis, but sun exposure can accelerate sclerotic changes in the lens.

Cataracts have many causes, from genetic to metabolic, nutritional to toxic, traumatic to inflammatory.
"Nuclear Sclerosis Hazy/cloudy eyes" "a blue or grey tint in one or both eyes"

The haze is often more apparent when viewed from the side, rather than directly.

Nuclear Sclerosis (aka: lenticular Sclerosis) does not typically cause significant changes in vision, so it’s not considered a serious canine health concern.

Lab Rat Studies:

Lesions of the cornea

Because of its anatomical position the cornea is the most susceptible to external injuries, and it may also
be the site of infectious diseases. Dystrophies and opacities increased with age. The opacities were
observed chiefly after 110 weeks of age: the cornea looked like an orange-peel (Fig. 1). It has been
suggested that dust from the powdered diet could be a causative factor of the lesion. The incidence was
higher in males.

Acute reversible lens opacities

These are associated with the anterior lens capsule and 3 patterns are seen. First superficial sub-capsular opacities, which begin at the anterior suture lines and then spread peripherally to the equator of the lens. Secondly cases where the opacities appear as cloudy crescents in the lower half of the lens and then extend around the periphery and inwards until the whole of the lens appears opaque. Thirdly the opacities appear as discreet plaque or granular deposits on the anterior surface of the lens. These types of opacities can be produced by the acute administration of drugs, and with continuation of treatment they do not progress to permanent cataracts.