Progressive retinal atrophy (PRA) in cats: symptoms, genetics and living with blindness

Cats are quiet about almost everything, and they are quietest of all about their eyes. A dog losing its sight will stumble, hesitate at the stairs, and broadcast its trouble in ways that are hard to miss. A cat does something different: it simply stops doing the things that now feel risky. The leap to the top of the bookshelf disappears. The midnight patrol of the house slows down. The cat who used to thread silently between table legs in a dark room starts moving more cautiously, or stops moving at night at all. By the time most owners realize something is wrong with their cat's vision, the cat has often been compensating quietly for weeks or months — and somewhere in a late-night search for answers, a phrase surfaces that sounds frightening: progressive retinal atrophy.

If your veterinarian has raised PRA, or you have begun to suspect your cat is going blind, the most useful thing to know up front is this: in cats, the words "the retina is degenerating" open onto a much wider set of possibilities than they do in dogs, and several of those possibilities are far more hopeful. True inherited PRA — the genetic, untreatable kind — is real but uncommon, concentrated in a few breeds. Much more often, a cat's retina is failing for a reason that is acquired rather than inherited, and a couple of those reasons can be slowed or even reversed if they are caught in time. That is why a cat with fading vision deserves a proper eye exam rather than resignation. This guide explains what PRA actually is in cats, the inherited forms and the breeds that carry them, the cat-specific causes that masquerade as PRA, how it is diagnosed, what can and cannot be treated, and how to help a low-vision or blind cat live a full and contented life.

What progressive retinal atrophy actually is

To make sense of PRA, picture the back of the eye. Lining the inner rear wall of the eyeball is a thin, delicate sheet of tissue called the retina — the place where seeing actually happens. Light enters through the pupil, the lens focuses it, and it lands on the retina, where millions of specialized cells called photoreceptors capture it and convert it into electrical signals that travel up the optic nerve to the brain. If the retina fails, the rest of the eye can be flawless and the cat will still be blind, because there is nothing left to turn light into vision.

Photoreceptors come in two kinds, and the difference shapes the whole story. Rods handle dim-light vision; they are extraordinarily sensitive but see only in shades of gray. Cones manage bright light, color, and fine daytime detail. In progressive retinal atrophy, these photoreceptors degenerate and die. "Progressive" means it worsens over time; "atrophy" means the tissue wastes away. Because the rods usually fail first, night blindness and trouble in dim light are typically the opening signs, with daytime vision lost later. This matters especially for cats, who are built for low-light hunting and rely heavily on those rod cells — losing them robs a cat of one of its signature abilities.

Crucially, PRA is a degeneration, not an inflammation, an injury, or a pressure problem. The cells are not under attack from infection, the eye is not being damaged by high pressure as in glaucoma, and nothing is clouding the path of light as in cataracts. The retina is simply, quietly programmed to fail. That is why inherited PRA does not hurt — there are no pain fibers being triggered — and why the eye often looks completely normal to the naked eye even as the cat goes blind.

The inherited forms of PRA in cats

Inherited PRA in cats is much less common than in dogs, but it is well documented, and like the canine disease it comes in two broad timing patterns.

Early-onset PRA (retinal dysplasia)

In the early-onset forms, the photoreceptors never develop normally. Affected kittens are born with abnormal retinal cells and begin losing vision very young — sometimes within the first weeks or months of life, with blindness following in the first year or two. Because this is a problem of development rather than aging, it is not usually what an owner of a senior cat is dealing with, but it is part of the same disease family and is the reason responsible breeders DNA-test their breeding stock.

Late-onset PRA (photoreceptor degeneration)

More relevant to an aging cat is the late-onset form, in which the retina forms and functions normally in kittenhood and then begins to degenerate later in life. Vision typically starts to fade somewhere in the early-to-middle adult years, with the decline progressing gradually toward blindness over a year or more. Because it begins in adulthood and moves slowly, owners frequently mistake the earliest changes for clumsiness, aging, or behavioral quirks. This slow, late pattern is the classic story of a once-surefooted cat who gradually becomes hesitant in the dark.

Why it happens: the genetics of feline PRA

Inherited PRA is written into a cat's DNA at conception. It is not caused by anything you fed your cat, any injury, or anything you could have done differently. Most of the recognized feline PRA forms are inherited in an autosomal recessive pattern, meaning a cat must inherit two copies of the faulty gene — one from each parent — to develop the disease. A cat with a single copy is a "carrier": it has normal vision and will never go blind from PRA itself, but it can pass the gene to its kittens. When two carriers are bred, each kitten has roughly a one-in-four chance of being affected, a one-in-two chance of being a carrier, and a one-in-four chance of being clear — which is why PRA can seem to appear from nowhere in a litter from two apparently healthy parents who were both silent carriers.

Not every form follows this pattern. In the Abyssinian, for example, both a dominant early-onset form and a recessive late-onset form have been described, which is part of why genetic testing in cats is often breed-specific. The practical upshot is the same as in dogs: for the breeds with a known mutation, a simple DNA test can identify carriers and affected cats long before any symptom appears.

Which cats are most at risk

Because inherited PRA is genetic, it clusters in particular breeds and lines. The breeds most often associated with hereditary PRA include the Abyssinian and its longhaired cousin the Somali, the Persian (and related breeds built from Persian lines), and the Bengal. Because so many modern breeds share ancestry with these cats — Ocicats and other Abyssinian-derived breeds, for instance — the relevant genes can appear beyond the founding breed.

It is worth saying plainly that the great majority of cats are not from these high-risk breeds, and even within them, most individual cats never develop PRA — especially where breeders DNA-test and avoid pairing two carriers. If you own a cat from an at-risk breed, this is useful to know not as a reason to worry but as a reason to ask your breeder whether the parents were tested and to stay alert to the early signs as your cat ages.

The presence of PRA in a breed does not mean any individual cat will develop it. Responsible breeders who DNA-test their breeding cats can avoid producing affected kittens, and the prevalence of inherited PRA falls as testing becomes routine.

The cat-specific twist: when retinal degeneration is acquired

Here is where feline PRA diverges most sharply from the canine version, and where the news is often better. In cats, a degenerating retina is frequently not inherited at all. Several acquired conditions damage the retina in ways that can look very much like PRA on an exam — and unlike true genetic PRA, some of them are preventable, and a few are partly reversible if caught early. This is the single most important reason a cat with fading vision needs a real diagnostic workup rather than a presumed diagnosis.

Taurine deficiency

Cats are obligate carnivores with an unusual nutritional quirk: they cannot make enough of an amino acid called taurine on their own and must get it from their diet. A taurine-deficient diet causes a specific retinal degeneration (historically called feline central retinal degeneration) that can progress to blindness — and it also damages the heart. This is why commercial cat foods are supplemented with taurine, and why feeding a cat a dog food, an unbalanced homemade diet, or a poorly formulated vegetarian diet is genuinely dangerous. The encouraging part is that if a taurine deficiency is caught before the retinal damage is complete, correcting the diet can halt further loss — making this one of the few causes of feline retinal degeneration that is partly preventable and treatable. For more on getting senior nutrition right, see our Senior Pet Nutrition Guide.

Medication toxicity

Certain drugs are toxic to the feline retina. The best-known example is the fluoroquinolone antibiotic enrofloxacin (and related drugs), which at higher doses can cause acute retinal degeneration and sudden blindness in cats — sometimes after just a short course. This is why veterinarians are careful with dosing in cats, and why you should never give a cat a medication, especially one prescribed for a dog or a person, without veterinary guidance. Medication-related retinal damage is a powerful argument for always running new medications past your vet.

High blood pressure (hypertensive retinopathy)

This may be the most important acquired cause of all in senior cats. Older cats commonly develop high blood pressure, very often as a complication of chronic kidney disease or hyperthyroidism. Dangerously high pressure can cause the retina to bleed or detach, producing sudden blindness — an owner may wake up to a cat with widely dilated pupils who is bumping into walls overnight. This is not PRA, and the distinction is life-changing: hypertensive retinal detachment is a medical emergency, but if blood pressure is brought under control quickly enough, the retina can sometimes reattach and vision can partially or fully return. A senior cat with sudden vision loss and big, fixed pupils should be seen the same day, with blood pressure checked.

If your senior cat loses vision suddenly, has newly dilated pupils, or is bumping into things overnight, treat it as urgent and contact your veterinarian right away. Sudden blindness from high blood pressure can sometimes be reversed if treated quickly — but the window is narrow.

Symptoms: how to recognize PRA in cats

Cats are masters at concealing disability, which is exactly why vision loss so often goes unnoticed until it is advanced. A cat with shrinking eyesight does not complain; it adapts, narrowing its world to the paths it can still navigate confidently. Knowing the signs helps you catch trouble earlier.

Night-time hesitation and reduced activity in the dark

Because the rods that govern dim-light vision fail first, the earliest sign is often a cat who becomes oddly cautious or inactive at night. A cat who once roamed the house in the dark may settle in one spot after the lights go out, seem disoriented in dim rooms, or want to stay close to you in the evening while behaving normally in daylight.

Stopping jumps and climbs

A cat losing depth perception and clarity will quietly abandon the leaps it can no longer judge. The cat who always claimed the top of the refrigerator, the windowsill, or the back of the sofa starts using lower routes or stops jumping altogether. Owners often read this as arthritis or aging — and it may be — but it can equally be vision loss.

Bumping into things, especially when things move

As vision fades further, a cat misjudges furniture, doorways, and steps — particularly in unfamiliar places or after the furniture has been rearranged. A revealing clue is a cat who navigates its own home reasonably well (from memory) but becomes clumsy at a new layout, in a boarding facility, or after you move a chair.

Widely dilated pupils and extra eye shine

As the retina thins and the cat tries to gather every scrap of light, the pupils often stay larger than normal even in bright conditions, and may respond sluggishly to light. Owners frequently notice the eyes seem to glow or reflect light more strongly than they used to — a brighter greenish or yellowish shine in photos or in headlights — because the degenerating retina reflects more light back out.

Cautious movement and a "searching" quality

A cat losing daytime vision may move with a low, careful, deliberate gait, feel for edges with its whiskers and paws, fail to track a thrown toy, or not greet you until it hears or smells you. Some cats become more vocal or clingy, anxious about being in unfamiliar space, or startle when touched without warning.

If you notice your cat hesitating in dim light, stopping jumps, bumping into objects, or showing unusually dilated or reflective eyes, schedule a veterinary eye examination. The signs of PRA overlap with several other conditions — some of them urgent and some of them treatable — and only an exam can sort out the cause.

PRA versus the conditions it is confused with

"My cat is going blind" can stem from several very different problems, and telling them apart changes everything about urgency and treatment.

PRA versus nuclear sclerosis

Many owners panic at a hazy, bluish-gray look to an older cat's pupils, but this is usually nuclear sclerosis — a normal, harmless hardening of the lens with age that mildly affects fine focus and does not cause blindness. It is not PRA and needs no treatment. A vet can distinguish it easily, which is one more reason a cloudy-eyed senior cat deserves an exam rather than alarm. Our guide to why an old cat's eyes turn cloudy walks through the possibilities.

PRA versus cataracts

A cataract is a clouding of the lens that physically blocks light from reaching the retina; the retina behind it may be perfectly healthy, and cataracts can sometimes be surgically removed to restore vision. PRA destroys the retina, so the path for light may be clear but there is nothing left to receive it. Critically, removing a cataract will not restore sight in a cat whose blindness is actually due to PRA — which is exactly why ophthalmologists test retinal function before recommending cataract surgery. In cats, cataracts are far less common than in dogs and usually point to inflammation inside the eye, so a cloudy feline lens is itself worth investigating. See Cataracts in Senior Cats.

PRA versus hypertensive retinal detachment

This is the most important distinction in senior cats. PRA is slow, painless, and begins with night blindness. Retinal detachment from high blood pressure is sudden — vision can vanish overnight — and it is an emergency in which fast treatment can sometimes reverse the blindness. Any senior cat with abrupt vision loss and big, dilated pupils should be checked the same day, with blood pressure measured.

PRA versus glaucoma

Glaucoma is a painful condition of dangerously high pressure inside the eye and a genuine emergency. It tends to cause a red, cloudy, enlarged, or visibly uncomfortable eye. PRA causes none of this — it is painless and the eye looks structurally normal. A red, painful, or bulging eye points away from PRA and needs prompt care. See Glaucoma in Senior Cats.

How PRA is diagnosed

Because PRA looks deceptively normal on the surface — and because so many cat-specific look-alikes need to be ruled out — confident diagnosis usually takes more than a quick glance with a penlight. Your general veterinarian may suspect it from the history and a basic exam, but a full evaluation often involves additional testing and sometimes referral to a veterinary ophthalmologist.

Ophthalmic examination

After dilating the pupils, the veterinarian examines the back of the eye with specialized lenses. In PRA, characteristic changes appear: the retinal blood vessels thin and shrink (they have less tissue to supply), the reflective layer behind the retina becomes abnormally bright, and the optic disc may pale over time. A trained examiner can often see these changes, and the same exam can spot a detached retina, bleeding, or inflammation that would point to a very different, sometimes treatable, cause.

Blood pressure measurement and bloodwork

In a senior cat, checking blood pressure is essential, because hypertension is a common and treatable cause of retinal damage and sudden blindness. Bloodwork to evaluate kidney function and thyroid levels often accompanies it, since kidney disease and hyperthyroidism are the usual drivers of feline high blood pressure. This step is what separates an emergency you can act on from an inherited disease you cannot.

Electroretinography (ERG)

An ERG is the gold-standard functional test. It measures the electrical response of the retina to flashes of light, directly assessing whether the photoreceptors are working; in PRA, the responses are diminished or flat. It is especially valuable for confirming PRA before obvious structural changes appear and for checking retinal function before considering cataract surgery.

Genetic (DNA) testing

For the breeds with a known PRA mutation — such as the Abyssinian, Somali, Persian, and Bengal — a simple DNA test on a cheek swab or blood sample can identify whether a cat is clear, a carrier, or genetically affected, often years before any symptom appears. This is the backbone of responsible breeding and can give owners of at-risk breeds advance warning. A clear result on one breed-specific test does not rule out every possible mutation, so genetic testing complements rather than replaces a clinical eye exam.

Is there a treatment or cure?

For true inherited PRA, honesty matters: at present there is no proven treatment that stops, reverses, or cures the disease, and no surgery restores lost photoreceptors. Once retinal cells die, they do not regenerate, and a cat with genuine genetic PRA will, in most cases, eventually go blind. Any product promising to reverse PRA deserves deep skepticism.

But — and this is the heart of why the feline version is different — the first job is always to make sure you are actually dealing with inherited PRA and not one of the acquired causes that can be addressed. A taurine deficiency caught before the damage is complete can be corrected by fixing the diet, halting further loss. A medication toxicity is managed by stopping the offending drug. And hypertensive retinal detachment, treated quickly with blood-pressure medication, can sometimes allow the retina to reattach and vision to return in part or in full. These are not theoretical; they are routine wins in feline practice, and they are precisely what a proper workup is designed to catch. Even when the diagnosis is genuine genetic PRA with no cure, treating any painful secondary complication keeps the eye comfortable, and gene therapy for inherited retinal disease is a genuinely promising area of research — not yet a widely available treatment, but a reason for hope on the horizon.

The most constructive way to hold all of this is to shift the goal. Once treatable causes are ruled out and a cat is going irreversibly blind, the aim is no longer to save the vision but to support the cat — to keep it comfortable, confident, and thriving through and beyond the transition. On that front there is a great deal you can do.

Helping a cat live well with vision loss

Here is the truth that surprises almost every owner: blind cats do remarkably well. Cats navigate their world through an extraordinary blend of smell, hearing, and the exquisitely sensitive whiskers and paw pads that map the space immediately around them. Because PRA takes vision slowly, most cats adapt gradually, building a detailed mental map of home long before their sight is gone. With a few thoughtful adjustments, a low-vision or blind cat can keep doing nearly everything it loves.

Keep the environment consistent

A blind cat navigates by memory, so the single most helpful thing you can do is avoid rearranging furniture. Keep litter boxes, food and water bowls, beds, and scratching posts in fixed locations. If you must change something, reintroduce your cat to the new arrangement gently and keep floors clear of clutter and trip hazards.

Make vertical space safe — or lower it

Cats love height, but a blind cat can misjudge a jump and fall. Add sturdy steps or ramps to favorite perches so the cat can climb rather than leap, block off dangerous drops and the tops of tall furniture, and place soft landings (a rug or bed) below spots your cat still likes to use. Many cats happily shift their favorite resting places lower once height becomes risky.

Use scent, sound, and texture as signposts

Help your cat map its world with cues other than sight. Texture changes underfoot — a particular mat by the food station, a runner leading to the litter box — give tactile landmarks. Keeping the litter box easy to find and never moving it is especially important, since a blind cat that cannot locate the box may have accidents. Talk to your cat as you move around so it can track where you are, and consider a ticking clock or soft radio as a fixed auditory anchor in a key room.

Announce yourself and approach gently

A blind cat touched without warning can be badly startled and may swat or bite reflexively out of fear. Speak before you reach out, and teach the whole household — especially children — to say the cat's name and let it sniff a hand before petting. A consistent verbal greeting builds trust and prevents frightened reactions.

Keep a blind cat indoors

A cat that cannot see should not roam outdoors unsupervised. It cannot judge traffic, escape predators, or find its way home reliably. Keep a blind cat safely indoors, and if it enjoys fresh air, offer it in a secure enclosed catio or on a harness under close supervision.

Lean into scent-based enrichment

Vision is far from a cat's only source of joy. Food puzzles, treat-scented toys, gentle play with noisy or crinkly toys it can hear, warm sunny resting spots, and plenty of affection all give a blind cat a rich, satisfying life. Many owners are astonished, months after a diagnosis they dreaded, at how normally and contentedly their blind cat moves through the house.

Introduce environmental changes gradually and under conditions where your cat feels safe, and consult your veterinarian if your cat is struggling to adjust, becoming fearful, having litter box accidents, or showing signs of anxiety or aggression.

What to expect: prognosis and the bigger picture

For true inherited PRA, the realistic outlook for vision is eventual blindness — but the outlook for the cat is excellent. Genetic PRA does not cause pain, does not make a cat ill, and has no effect on lifespan. A cat with PRA that is otherwise healthy can expect to live just as long, and just as happily, as any other cat. The disease takes the sight; it does not take the life, the personality, or the capacity for contentment.

The timeline varies by form and breed, but late-onset PRA often unfolds gradually over a year or more, giving both cat and family time to adjust — which is part of why cats cope so well. And because so many feline cases of retinal degeneration turn out to have an acquired, sometimes treatable cause, the most important thing you can do at the first sign of fading vision is not to despair but to investigate. The difference between "there is nothing to be done" and "we caught the high blood pressure in time" can be a single same-day vet visit.

There is also a quiet responsibility that comes with an inherited PRA diagnosis in a breeding cat: affected cats, and ideally known carriers, should not be bred, because doing so risks passing the disease to future generations. DNA testing has made it possible to steadily reduce inherited PRA in at-risk breeds, and every owner and breeder who tests responsibly is part of that progress.

If you are standing at the beginning of this road, frightened by a phrase that sounds like the end of your cat's good life, hold on to this: it usually is not. Whether your cat's vision can be saved or not, a cat that is loved, kept safe, and gently guided does not experience its world as diminished — it experiences it as home, full of familiar scents, trusted voices, the warm patch of afternoon sun, and the steady presence of the person it loves most. With your patience and a few small adjustments, your cat can keep being exactly who it has always been. It will simply find its way to you by your scent and your voice, the way it always really did.

This article provides general educational information about progressive retinal atrophy and other causes of vision loss in cats. It is not a substitute for individualized veterinary care. In cats, a degenerating retina has many possible causes — including inherited PRA, taurine deficiency, medication toxicity, and high blood pressure from kidney disease or hyperthyroidism — and several of these are urgent or treatable, which is why a cat with changing vision should always be examined rather than assumed to have an untreatable condition. Sudden vision loss, newly dilated pupils, or a red, cloudy, or painful eye warrants same-day veterinary attention. A veterinary ophthalmologist is best equipped to confirm PRA through a dilated eye exam, electroretinography, and where appropriate genetic testing, and your veterinarian can check blood pressure and run bloodwork to identify treatable causes. Never give your cat any medication without veterinary guidance, and base any diet changes on a complete, balanced, taurine-adequate feline diet.