TL;DR: A bluish haze in an older cat's eyes is usually lenticular sclerosis, a normal age-related change that does not cause pain or blindness. However, consult a vet if you notice redness, squinting, or a solid white appearance, which could indicate cataracts.
What causes a cloudy or bluish haze in my older cat's eyes?
A cloudy, bluish-grey haze in an older cat's pupils is most commonly a condition called lenticular sclerosis, also known as nuclear sclerosis. This is a normal part of the aging process where the lens fibers become denser and more compressed over time. While it changes the appearance of the eye, it is generally transparent and allows light to pass through to the retina.
Is a bluish haze in my cat's eyes a medical emergency?
- The urgency level for lenticular sclerosis is low, as it is not painful and does not cause sudden blindness.
- It is important to distinguish this from cataracts, which are opaque and can lead to inflammation or vision loss.
- Schedule a veterinary visit promptly if your cat's eye appears suddenly white, or if you notice redness, squinting, or rubbing at the eye.
How can a photo help my veterinarian triage my cat's eye condition?
- Capturing a clear, well-lit photo of your cat's eyes can significantly assist a veterinary professional in a remote assessment.
- A photo helps the vet see the depth and texture of the cloudiness to distinguish between normal aging and a solid, milky cataract.
- This visual data helps determine how quickly your cat needs to be seen in person.
Clinical Context (Merck Veterinary Manual)
Diseases of the lens involve changes in its transparency; the sole function of the lens is to allow unaltered passage of light and images to the retina. Cataracts are an opacity of the lens or its capsule and should be differentiated from the normal increase in nuclear density (nuclear sclerosis) that occurs in older animals. Most cataracts can be detected by dilating the pupil and examining the pupillary region against the retroillumination of the tapetal fundus; slit-lamp biomicroscopy permits optimal direct examination of the lens. While cataracts are often inherited in dogs, in cats and horses, most cataracts are secondary to anterior uveal inflammation and are typically reported in young animals. Cataracts are classified by their age of onset (congenital, juvenile, senile), anatomic location, cause, degree of opacification (incipient, immature, mature, hypermature), and shape.
Chapter: Ophthalmology
Source: The Merck Veterinary Manual, 11th Edition (Page 499)