Cat Retinal Degeneration: Signs, Causes & Care

Retinal degeneration in cats — including progressive retinal atrophy (PRA) and acquired feline retinal degeneration (most commonly caused by taurine deficiency or hypertension) — causes progressive vision loss that owners often miss until the cat is functionally blind. Early recognition and treatment of underlying causes can slow or prevent further vision loss.

Last reviewed: June 2026

What Is Retinal Degeneration in Cats?

The retina is the thin layer of photoreceptor cells lining the back of the eye. Degeneration of the retina destroys the rods (low-light/peripheral vision) and cones (color and detail vision), leading to irreversible vision loss. In cats, retinal degeneration occurs in two main forms:

Inherited (primary) retinal degeneration:

• Progressive retinal atrophy (PRA) — rod-cone dysplasia or degeneration; present in Abyssinians, Persians, Bengals, and Domestic Shorthairs. Rods degenerate first (causing night blindness), followed by cones (causing day blindness)

Acquired (secondary) retinal degeneration:

• Taurine-deficiency retinopathy — once the most common cause of feline retinal degeneration, now largely prevented by taurine supplementation in commercial cat food following a 1987 outbreak traced to low-taurine diets. Still seen in cats fed homemade unsupplemented diets, dog food, or some unregulated raw diets. As described in Nelson & Couto's Small Animal Internal Medicine, taurine deficiency causes distinctive bilateral "bull's-eye" lesions visible on fundoscopic examination
• Hypertensive retinopathy — high blood pressure (systolic BP >160 mmHg) causes retinal vessel damage, hemorrhage, and detachment; frequently seen in cats with hyperthyroidism or chronic kidney disease. Hypertensive retinopathy can cause sudden complete blindness and is a treatable emergency if caught quickly
• Inflammatory retinitis — secondary to systemic infections including FIV, FeLV, feline infectious peritonitis (FIP), and toxoplasmosis

Approximately 80% of cats with chronic kidney disease develop some degree of systemic hypertension that can threaten the retina, according to the IRIS CKD Staging Guidelines, 2023.

Signs of Vision Loss From Retinal Degeneration

Cats adapt to gradual vision loss remarkably well in familiar environments, which is why owners often notice nothing until the cat encounters an unfamiliar space or until blindness becomes complete:

Early and subtle signs:

• Hesitation before jumping onto familiar furniture (misjudging distances)
• Reluctance to navigate in dim lighting — bumping into objects at night while moving confidently in daylight (rods lost first in PRA)
• Pupils that appear dilated (widely open) in normal room lighting
• Mild disorientation in new environments

Later and more obvious signs:

• Walking slowly with a wide-legged, cautious gait — sometimes with the head slightly lowered
• Startling when touched unexpectedly (hearing and touch compensate for lost vision)
• Bumping into furniture or walls, especially after moving to a new room or rearranging furniture
• Eyes appearing glassy or the tapetum (reflective layer) abnormally bright when a flashlight is shone at the eyes

Hypertensive retinal detachment (emergency):

• Sudden complete blindness, often within hours
• Fixed, maximally dilated pupils that do not constrict in bright light
• Often accompanied by other hypertension signs: sudden vocalization, apparent confusion, circling, or seizure-like activity

Diagnosis and Treatment

Your vet will perform a full ophthalmic examination including direct and indirect ophthalmoscopy to view the retina, tonometry to rule out glaucoma, and blood pressure measurement. Referral to a veterinary ophthalmologist provides the most detailed retinal assessment.

Treatable causes:

• Hypertension — antihypertensive therapy (amlodipine is the drug of choice in cats) can halt further retinal damage and, in some acutely detached cases, allow partial vision recovery if treated within 24–48 hours. The IRIS CKD Staging Guidelines, 2023 recommend blood pressure monitoring in all cats with CKD to detect hypertension before retinal damage occurs
• Taurine deficiency — supplementation with taurine (250 mg twice daily) can stabilize or partially reverse early lesions; switch to a complete and balanced commercial diet. Full reversal is uncommon once lesions are extensive

Untreatable causes:

• Inherited PRA currently has no effective treatment; management focuses on environmental adaptation

Home Adaptations for a Blind or Visually Impaired Cat

Cats adapt to blindness better than most species, particularly when vision is lost gradually. Key adaptations:

• Never rearrange furniture; keep food, water, and litter box in predictable locations
• Use sound and scent cues — a radio or clock near the cat's sleeping area, scented markers at room thresholds
• Prevent access to stairs without barriers during the adjustment period
• Add tactile markers (a textured mat) near the litter box entry
• Keep the blind cat indoors; outdoor environments are dangerous without reliable vision

When to See a Vet

Call your vet today if:

• Your cat hesitates before jumping, bumps into things, or appears unsure in familiar spaces
• Your cat's pupils appear unusually large in normal lighting
• Your cat has a diagnosis of CKD, hyperthyroidism, or FIV/FeLV and has not had blood pressure checked recently

Go to the ER immediately if:

• Your cat suddenly appears blind — pupils are maximally dilated and not responding to light
• Your cat is circling, vocalizing in apparent distress, or appears severely disoriented
• You notice visible blood inside the eye or a detached, rippling appearance to the back of the eye when light is shone in

Frequently Asked Questions

Can cat retinal degeneration be reversed? Some acquired causes — particularly hypertensive retinopathy caught within 24–48 hours of retinal detachment, and taurine deficiency treated early — can stabilize or partially reverse with appropriate treatment. Inherited PRA and long-standing acquired degeneration with extensive photoreceptor loss cannot be reversed. The goal in those cases is to halt progression (where possible) and adapt the environment for a quality life without full vision.

How common is retinal degeneration in cats with kidney disease? Systemic hypertension is present in an estimated 20–65% of cats with chronic kidney disease across IRIS stages, and hypertensive retinopathy — including retinal hemorrhage and detachment — is one of the most common consequences. The IRIS CKD Staging Guidelines, 2023 recommend blood pressure monitoring at every CKD recheck visit (every 3–6 months). Early antihypertensive treatment prevents retinal damage.

What does a blind cat's eye look like? A blind cat's pupils are often maximally dilated even in bright light — the pupillary light reflex is reduced or absent. The eyes may appear glassy or slightly enlarged (if secondary glaucoma develops). On fundoscopic examination, retinal vessels appear attenuated (thin), the optic disc may appear pale, and in hypertensive cases, hemorrhages and detachment are visible. Owners sometimes notice the eyes appear to "glow" more brightly when a camera flash hits them — caused by increased exposure of the tapetum when pupils cannot constrict.

My cat's diet is home-prepared — should I worry about taurine deficiency? Yes — taurine deficiency is a real risk in cats fed home-prepared diets that have not been formulated and supplemented by a board-certified veterinary nutritionist. Cats are obligate carnivores who cannot synthesize sufficient taurine; commercial cat food is legally required to meet minimum taurine requirements, but home-prepared diets vary widely. The WSAVA Global Nutrition Guidelines, 2011 recommend that any home-prepared diet for cats be formulated by a board-certified nutritionist and include validated taurine supplementation.

How much does diagnosing cat vision loss cost? Initial veterinary ophthalmic examination: $100–200. Referral to a veterinary ophthalmologist: $200–500 for complete fundoscopic evaluation. Blood pressure measurement is inexpensive ($30–60) and should be standard in any cat over age 7 or with CKD or hyperthyroidism. Amlodipine (antihypertensive) costs $15–50/month. Taurine supplements are $10–25. Managing retinal detachment from hypertension through antihypertensives is far less expensive than the cost of caring for a blind cat long-term.

Still Not Sure if Your Cat Needs a Vet?

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