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Eye problems in cats can look similar even when their causes are very different, so a red, runny, squinting, cloudy, swollen, or injured eye should be assessed by a veterinarian. If you’re asking, “What’s wrong with my cat’s eye?”, the safest answer is that appearance alone cannot identify the cause—and some conditions can permanently damage vision.
Sudden vision loss is urgent. Other persistent or painful changes also warrant prompt veterinary attention, rather than home diagnosis or treatment. The sections below explain common feline eye problems, what a veterinarian may check, and what details to report.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsWhen should I call a vet about my cat’s eye?
Contact a veterinarian promptly if your cat’s eye is painful, persistently squinting, cloudy, swollen, enlarged, producing discharge, or visibly injured. Treat sudden vision changes as urgent: call a veterinary clinic or emergency service right away for advice on where to go. Cornell lists conditions including corneal or eyelid lacerations, ulcers, glaucoma, uveitis, other trauma, and a ruptured eye among ophthalmology emergencies.
Do not wait for a particular combination of signs to appear. A cat may have a serious problem even if the eye is not dramatically red, and the same visible sign can arise from different diseases. Cornell ophthalmologist Thomas Kern advises, “If you spot anything unusual, get it checked out promptly by your veterinarian,” in Cornell’s guide to feline vision problems.
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While arranging care, note when you first noticed the change and whether it is getting worse. Tell the clinic about discharge, rubbing, light sensitivity, a recent injury or possible chemical exposure, changes in navigation, and any difference between the eyes. These observations help the veterinarian; they do not establish a diagnosis. Avoid putting unprescribed drops or other products in a painful or injured eye.
What signs of feline eye problems should I watch for?
Changes in appearance, comfort, or vision can all signal an eye problem. Watch for:
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- Redness or swelling around the eye, or visible swelling of the eye itself
- Frequent blinking, squinting, keeping the eye closed, or avoiding bright light
- Watery, thick, or otherwise unusual discharge
- Cloudiness or a change in the eye’s color or appearance
- Rubbing the face or eye, or signs of visible injury
- Pupils that look unequal, or a pupil that appears unusually dilated
- The third eyelid becoming more visible or protruding
- Bumping into furniture, hesitating in unfamiliar surroundings, or navigating differently
One or more of these signs can occur with conditions affecting different parts of the eye. Cloudiness, for example, may involve the cornea or the lens, while pressure inside the eye can also change its appearance. A cat’s behavior can suggest a vision change, but it cannot tell an owner which disease is responsible. Report what you see rather than trying to match it to a diagnosis.
What are the common eye problems in cats?
Several conditions can cause discomfort, discharge, cloudiness, or changes in vision. The affected structure and veterinary examination help distinguish them; symptoms by themselves are not a reliable home decision tree.
| Condition | Part affected | Possible signs | Why assessment matters |
|---|---|---|---|
| Conjunctivitis | Conjunctiva—the membrane lining the eyelids and covering the outer eyeball | Red or swollen tissue, squinting, frequent blinking, watery or thick discharge | Infection or irritants may be involved, and an exam helps rule out more serious disease. |
| Corneal ulcer | Cornea—the clear outer surface of the eye | Squinting, rubbing, light sensitivity, discharge, cloudiness, or inflammation around the cornea | The damaged surface can be painful; an exam and fluorescein dye can help confirm an ulcer. |
| Cataract | Lens, which becomes cloudy | Cloudiness and possible difficulty navigating | The cause and severity guide management; related disease may need attention. |
| Glaucoma | Fluid drainage and pressure inside the eye, with risk to the optic nerve | Progressive cloudiness, enlargement, squinting, or a dilated pupil that does not respond to light | It can irreversibly damage vision; diagnosis includes measuring eye pressure. |
| Uveitis or retinal detachment | Internal eye structures, including the uvea or retina | Vision change may be sudden or progressive | These conditions can threaten sight, and retinal detachment may be linked with systemic illness. |
Conjunctivitis
Conjunctivitis is inflammation of the membrane lining the eyelids and covering the outer eyeball. It is a common feline eye disorder. Possible causes include feline herpesvirus, calicivirus, certain bacteria, dust, airborne chemicals, and plants. It is more common in young cats and in multi-cat environments.
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Squinting, frequent blinking, redness or swelling of the conjunctival tissue, and watery or thick discharge can occur. Those signs do not prove conjunctivitis: other eye problems can also cause discomfort and discharge. Cornell recommends veterinary care when discomfort and discharge are present, in part to rule out more serious disease. Treatment depends on the cause, so do not select drops or medication based on redness alone. See Cornell’s overview of conjunctivitis.
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Corneal ulcers
A corneal ulcer is a loss of cells in the cornea’s outer layer. It may follow a scratch, an ingrown eyelash, debris trapped under an eyelid, exposure to caustic chemicals, or infection. Cornell identifies recurrent feline herpesvirus as a frequent cause. Signs can include squinting, rubbing, light sensitivity, discharge, cloudiness, or inflammation around the cornea.
A veterinarian may use fluorescein dye to reveal damaged corneal tissue and help confirm an ulcer. The right care depends on its severity and cause; veterinary treatment may address pain and inflammation and help prevent secondary infection. A veterinarian may also recommend an Elizabethan collar to stop rubbing or other self-trauma while the ulcer heals. Use one for this purpose when directed by the veterinarian, not as a substitute for an examination. More detail is available in Cornell’s corneal-ulcer guide.
Cataracts
A cataract is clouding of the lens, and it can affect one or both eyes. Possible causes include aging, metabolic factors, and trauma; diabetes or hypertension are less common causes, and sometimes the cause is unknown. A cat with impaired vision may bump into furniture or become cautious in unfamiliar places.
Cloudiness does not automatically mean a cataract: the cornea and other eye structures can also be involved. A veterinary examination is needed to identify the affected structure and assess whether vision is affected. Management depends on the cause and severity. Cornell describes addressing related disease and surgery for selected cases; this is not a decision to make from the appearance of the eye alone. Read Cornell’s information on feline cataracts.
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Glaucoma
Glaucoma develops when abnormal fluid drainage raises pressure inside the eye, potentially damaging the optic nerve. Possible signs include progressive cloudiness, an enlarged eye, squinting, or a dilated pupil that does not respond to light. A veterinarian diagnoses it through a thorough eye examination that can include tonometry, a measurement of eye pressure.
Glaucoma is not reversible. Treatment may reduce pain and slow progression, and a specialist referral may be advised. Cornell ophthalmologist Thomas Kern warns that by the time clinical signs are noticed, substantial vision loss may already have occurred. That is why a cloudy or enlarging eye should not be watched at home in the hope that it will resolve. See Cornell’s guide to feline glaucoma.
Uveitis, retinal detachment, and sudden vision loss
Uveitis is an important cause of blindness in cats. Retinal detachment can be associated with hypertension, hyperthyroidism, or kidney disease. A sudden or progressive change in vision needs prompt veterinary assessment because an eye problem may be connected to a broader illness, and the timing of care may affect whether vision can be saved.
Hypertension can affect the eyes, so a veterinarian may consider systemic health as part of the investigation. Do not assume that a vision change is simply an effect of aging or a problem confined to the visible surface of the eye. Cornell discusses these possible causes in its feline vision overview and hypertension guide.
How does a veterinarian find the cause?
The veterinarian combines the cat’s history with an eye examination and, when appropriate, targeted tests. The approach depends on what the examination reveals; no single visible sign or test is a complete diagnosis.
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- Describe the change. Share when it started, whether it is worsening, and whether one or both eyes are affected. Mention discharge, squinting, rubbing, light sensitivity, possible trauma or chemical exposure, and any difficulty moving around.
- Expect an eye examination. The veterinarian will assess the eye and surrounding tissues and consider the cat’s medical history. If a systemic condition could be involved, that possibility may shape what happens next.
- Use condition-specific tests when needed. Fluorescein dye can reveal corneal damage and help confirm an ulcer. Tonometry measures pressure inside the eye and is part of glaucoma diagnosis.
- Follow the diagnosis-specific plan. Treatment choices depend on the disease, its cause, and its severity. Ask the veterinarian what changes should trigger a return visit and how to support the cat without interfering with treatment.
This process matters because conjunctivitis, an ulcer, cataracts, glaucoma, and internal eye disease do not have interchangeable treatments. A product that might be appropriate for one diagnosis may not address another. An eye examination is the way to move from an uncertain sign to a condition-specific plan.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should I do at home while arranging veterinary care?
Keep the next steps simple: contact a veterinarian, observe without probing the eye, and avoid unprescribed treatment. Do not use human eye medicine or choose veterinary drops, antibiotics, antivirals, supplements, or home remedies based on appearance. The sources describe care as dependent on diagnosis and severity, and a painful or injured eye needs veterinary direction.
If you suspect injury or chemical exposure, tell the clinic when you call and follow its advice. Do not delay urgent care to try a home remedy. If a veterinarian has diagnosed a corneal ulcer and recommends an Elizabethan collar, use it as directed to help prevent rubbing during healing. It does not replace follow-up or the prescribed treatment plan.
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Can you tell what is wrong from the appearance of the eye?
No. Redness and discharge can occur with conjunctivitis but can also accompany other problems; cloudiness can involve the cornea, lens, or pressure-related disease. A visible sign is useful information for a veterinarian, not a reliable diagnosis or basis for choosing medication.
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The most useful owner response is to note what changed, when it began, and whether the cat seems uncomfortable or has trouble seeing, then seek veterinary guidance. Sudden vision loss, visible injury, or a painful, swollen, or cloudy eye deserves particular urgency.
Frequently Asked Questions
Can high blood pressure cause eye problems in cats?
Yes. Feline hypertension can be associated with retinal detachment and sudden vision loss. Cornell reports that at least 60% of cats diagnosed with hypertension also have signs of chronic kidney disease, and about 20% of cats diagnosed with hyperthyroidism are diagnosed with hypertension; those figures describe related conditions, not the prevalence of eye disease.
Can a corneal ulcer come back in a cat?
It can be associated with recurrent feline herpesvirus, which Cornell identifies as a frequent cause of corneal ulcers. A veterinarian can assess a recurring problem and determine whether the current signs reflect an ulcer or another condition.
Are eye problems more common in kittens or cats living with other cats?
Conjunctivitis is more common in young cats and in multi-cat environments, according to Cornell. That does not mean every young cat or cat in a multi-cat home will develop it, or that discharge should be assumed to be conjunctivitis.
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