A cloudy haze over your pet's eyes can be alarming to notice, but it doesn't always mean something serious. Here's how to tell the difference between normal aging and something that needs treatment.
Nuclear sclerosis: the common, harmless one
Most senior dogs and cats develop a bluish-gray haze in the center of their eyes, called nuclear sclerosis. It's caused by the lens naturally hardening with age, doesn't significantly affect vision, and doesn't need treatment.
Cataracts: what actually looks different
Cataracts appear more solidly white or opaque, rather than a soft blue-gray haze, and they can affect vision more noticeably, especially in dim light. Cataracts can develop from aging, diabetes, or genetics, and in advanced cases can lead to blindness.
A simple way to tell them apart at home
Nuclear sclerosis tends to look like a light haze you can still somewhat see through, while cataracts often look like a denser white or pearly patch. When in doubt, a vet can tell the difference in a quick exam — it's not something you need to diagnose yourself.
Signs your pet's vision may be affected
Bumping into furniture, hesitating on stairs, being more easily startled, or reluctance to go outside at night can all suggest vision changes, regardless of the cause.
What to do about cataracts
Mild cataracts are often just monitored. If they progress and start affecting quality of life, surgical removal is available and has a high success rate in both dogs and cats, though it's a decision to make with a vet or veterinary ophthalmologist.
When to get it checked
Any sudden cloudiness, redness, squinting, or apparent vision loss should be seen promptly, since some causes, like glaucoma, need urgent treatment. Gradual, mild haziness in an older pet is usually fine to bring up at a regular checkup.