Retinal detachment itself is not painful for cats. The retina has no pain receptors, so the physical separation of this tissue from the back of the eye doesn’t cause discomfort. Most cats with a detached retina can live comfortably, and many owners only notice something is wrong when their cat starts showing signs of vision loss. The real concern, both for pain and for your cat’s overall health, comes from the conditions that cause the detachment and the complications that can follow it.
Why It Doesn’t Hurt (and What Can)
The retina is a thin layer of light-sensitive tissue lining the back of the eye. When it separates from its underlying support layer, it disrupts vision but doesn’t trigger pain signals. Your cat won’t squint, paw at its face, or cry out because of the detachment alone.
However, the underlying cause of the detachment can produce discomfort. Inflammation inside the eye (uveitis), which sometimes accompanies or triggers detachment, can make the eye sore. The more significant pain risk comes later: months or even years after a retinal detachment, pressure inside the eye can rise, a condition called secondary glaucoma. Glaucoma is genuinely painful for cats, and when it develops, removal of the affected eye is often recommended. Because of this risk, veterinary ophthalmologists advise checking eye pressure every four to six months in any cat with a known retinal detachment.
Signs You Might Notice at Home
Since there’s no pain response to alert you, the most obvious sign of retinal detachment is sudden blindness. Your cat may start bumping into furniture, hesitate before jumping, or move around the house less confidently than usual. These behavioral changes can be surprisingly subtle, especially if only one eye is affected. Cats are remarkably good at compensating with their remaining senses.
The most visible physical clue is abnormally large (dilated) pupils that don’t shrink in bright light. If one eye is detached and the other isn’t, you may notice the pupils are different sizes. Some cats also show a change in the way light reflects from the eye, giving it a slightly different appearance than normal.
If secondary glaucoma develops later on, the signs to watch for include squinting, a cloudy or bluish appearance to the eye, and withdrawal from normal activities. Even these signs can be subtle in cats, so regular veterinary checkups matter more than relying on behavioral cues alone.
What Causes Retinal Detachment in Cats
The most common cause by far is high blood pressure. In a study of 69 cats with hypertension-related eye damage published in JAVMA, 54 had abnormal kidney function. Chronic kidney disease is the primary driver of high blood pressure in cats, and that sustained pressure damages the tiny blood vessels in the retina, leading to swelling, bleeding, and eventually detachment.
Hyperthyroidism is the second most common contributor. An overactive thyroid increases heart rate and changes how the cardiovascular system regulates pressure, which can push blood pressure high enough to damage the eyes. Less frequently, diabetes and a rare adrenal gland condition called hyperaldosteronism have also been linked to feline hypertension and retinal problems.
Because of these connections, a cat diagnosed with retinal detachment will typically need blood pressure measurement, blood work, and a urine test. The detachment is often the first visible sign of a systemic disease that’s been developing quietly. Treating the underlying condition, particularly getting blood pressure under control, is essential both for protecting the other eye and for your cat’s overall health.
How Vets Diagnose It
A veterinary ophthalmologist can usually see a detached retina by looking into the eye with a specialized scope. The detached tissue appears as a thin, grayish veil with blood vessels visible on its surface. If the view into the eye is blocked by cloudiness, inflammation, or cataracts, an ultrasound of the eye can reveal the detachment as a thin, bright line floating in the gel-filled chamber behind the lens.
Can Vision Be Restored?
It depends on how quickly treatment begins and how severe the detachment is. When high blood pressure is the cause, bringing blood pressure down with medication can sometimes allow a partially detached retina to reattach on its own, particularly if treatment starts soon after vision loss occurs.
In more severe cases where the retina has completely separated, surgical reattachment may be an option. This specialized procedure has the best chance of restoring vision when performed within roughly four weeks of the detachment. Beyond that window, the retinal tissue deteriorates and the likelihood of recovering useful vision drops significantly.
Even if vision can’t be saved, most cats adapt well to partial or complete blindness in a stable home environment. They rely heavily on whiskers, hearing, and spatial memory, and many blind cats continue to navigate familiar spaces with surprising confidence. The priority shifts to managing the underlying disease and monitoring for painful complications like glaucoma that would affect your cat’s quality of life.