Inside the eye sits a clear structure called the lens. Its job is to focus incoming light onto the retina at the back of the eye.
A cataract develops when the normally transparent lens becomes opaque or cloudy.
As the cataract grows vision becomes increasingly blurred as light struggles to reach the retina. This can cause partial or complete blindness.
Cataracts can affect one eye or both.
Several factors can lead to cataract formation:
As dogs grow older, the proteins within the lens can change, leading to gradual clouding. These typically progress slowly, giving dogs time to adapt.
Dogs with diabetes frequently develop cataracts. High blood sugar causes changes within the lens that can lead to rapid clouding and sudden vision loss.
Traum, even mild injury, can trigger inflammation inside the eye, which may result in cataract formation.
Cataracts may occur alongside diseases such as:
Some breeds are genetically predisposed, including golden and Labrador retrievers and miniature schnauzers. Cataracts may be present at birth (congenital) or develop later in life.
Not all cloudy eyes are cataracts.
A common age-related change where the lens develops a bluish-grey haze. Unlike cataracts, nuclear sclerosis usually does not significantly affect vision.
However, a veterinary examination is needed to tell the difference.
A vet will examine the eyes using an ophthalmoscope to look at the lens and retina. Eye pressure may be measured to rule out glaucoma.
If an underlying condition such as diabetes is suspected, blood and urine tests may also be recommended.
The only way to remove a cataract is through surgery. The most common procedure is called Phacoemulsification.
During this procedure:
This surgery is performed by a veterinary ophthalmologist and is not suitable for every dog. Ideal candidates are otherwise healthy and free from serious additional eye disease.
After surgery, dogs require regular eye drops, careful monitoring and follow-up examinations.
As with any operation, complications are possible and should be discussed with your vet beforehand.
Many dogs live comfortably with cataracts, particularly when vision loss is gradual.
If surgery isn’t appropriate, management may include:
Dogs generally adjust well when their surroundings remain predictable.
While not all cataracts are preventable, you can reduce risk by:
Regular veterinary check-ups can help detect early changes.
Arrange a veterinary appointment if you notice:
Eye problems can worsen quickly, so early assessment is always advisable.
Cataract surgery and long-term eye care can be expensive.
If you’re able to, consider pet insurance while your dog is young and healthy to help with unexpected illness or injury. If your dog becomes unwell, talk openly with your vet about the options, the likely costs, and what feels manageable for you. Together, you can tailor a plan that’s right for your dog and your situation.
