Cat Eye Infections: Causes, Symptoms, Treatment and When It’s an Emergency

Your cat’s eyes are one of its most striking features, and one of the first places health problems show. A little discharge may be just dust, or the first sign of a viral infection or a corneal ulcer that needs prompt treatment. This guide explains the causes of cat eye infections, how to tell a minor problem from an emergency, and what you should never do at home.

What a Healthy Cat Eye Looks Like

Fully open and bright, with no excessive blinking.
Clean whites without obvious redness.
A clear cornea (the transparent front layer) with no cloudiness.
Only a little dry brown discharge in the corner at times, which is normal.
The third eyelid (the white membrane in the inner corner) usually not visible.

Signs of Eye Problems in Cats

Heavy watery, yellow or green discharge.
Redness of the eye or swollen eyelids.
Squinting or constant blinking, a sign of pain.
Pawing at the eye or rubbing it on furniture.
Cloudiness or a blue or white film on the eye.
The third eyelid covering part of the eye.
Pupils of different sizes.
Sensitivity to light and hiding in dark places.

Common Causes of Cat Eye Infections

1. Conjunctivitis

Inflammation of the pink membrane lining the eyelids is the most common eye problem in cats, causing redness, swelling and discharge. It is usually caused by viral or bacterial infection, and sometimes by allergies, dust or irritants.

2. Feline Herpesvirus (Cat Flu)

The leading cause of recurring eye infections in cats, often with sneezing and a runny nose. After the first infection the virus stays dormant and can flare up again with stress or illness. It can also cause corneal ulcers.

3. Chlamydia and Mycoplasma

Bacteria that cause conjunctivitis, often starting in one eye before spreading to the other, and passing easily between cats in crowded homes. They need the right antibiotic chosen by your vet.

4. Corneal Ulcers

A scratch or wound on the eye’s surface from another cat’s claw, a foreign body or herpesvirus. Ulcers are very painful, causing squinting and tearing. Deep ulcers can perforate and threaten the eye, so they are an emergency.

5. Tear Staining in Flat-Faced Cats

Persians, Himalayans and Exotics often have overflowing tears and stained fur under the eyes because of their flat faces and narrow tear ducts, sometimes combined with inward-rolling eyelids or hair touching the eye.

6. Entropion

When the eyelid rolls inward, lashes and hair rub constantly on the cornea, causing chronic irritation and sometimes ulcers. Treatment is usually surgical.

7. Uveitis

Inflammation inside the eye, often linked to whole-body diseases such as viral infections. Signs include redness, a color change, a small pupil and pain. Testing is needed to find the underlying cause.

8. Glaucoma

Less common in cats than in dogs, but serious and can cause blindness. Signs include an enlarged eye, a cloudy cornea and a dilated pupil.

9. Foreign Bodies and Injuries

Plant seeds, sand or injuries from play and fights can cause sudden pain in one eye.

When Is It an Emergency?

See a vet the same day if you notice:

The eye held completely shut or obvious pain.
A cloudy, white or blue surface.
A bulging, enlarged or sunken eye.
A visible injury or scratch.
Bleeding inside the eye or a sudden color change.
Signs of vision loss, such as bumping into things.
Yellow or green discharge with lethargy and poor appetite, especially in kittens.

How Vets Diagnose Eye Problems

Examination with light and magnification of the lids, cornea and inner eye.
Fluorescein stain: a green dye that reveals ulcers and scratches.
Tear test: measures tear production.
Eye pressure measurement: to rule out glaucoma.
Swabs and PCR: to identify herpesvirus or Chlamydia in recurring cases.
Blood tests: when the eye may reflect a body-wide disease.

Treatment

Treatment depends entirely on the cause; there is no single drop for every case. It may include:

Antibiotic drops or ointments for bacterial infections.
Antiviral medication for severe or recurring herpes.
Pain and anti-inflammatory treatment as appropriate.
Specific ulcer treatment with follow-up until healed, often with a cone to prevent rubbing.
Surgery for entropion or deep ulcers.
Treating the underlying disease when the eye is affected by a systemic illness.

Common Mistakes to Avoid at Home

Don’t use human eye drops. Some contain ingredients that harm cats’ eyes or delay ulcer healing.
Never use steroid drops without an exam. If an ulcer is present, steroids can deepen it quickly and endanger the eye.
Don’t put chamomile, tea or home remedies in the eye.
Don’t reuse leftover drops from a previous treatment.
Don’t wait more than a day or two if the eye isn’t improving, or at all if there is pain.

How to Clean Your Cat’s Eyes Safely

Wash your hands well.
Moisten a clean cotton pad with sterile saline or cooled boiled water.
Wipe gently from the inner corner outward.
Use a fresh pad for each eye to avoid spreading infection.
Pat dry gently and reward your cat.

Cleaning removes discharge and makes your cat comfortable, but it doesn’t treat the cause. If discharge returns or the eye is red, book a check-up.

Protecting Your Cat’s Eyes

Keep core vaccines up to date (they cover herpesvirus and calicivirus).
Have any new cat checked before introducing it.
Reduce stress at home, as stress reactivates herpesvirus.
Clean flat-faced cats’ eyes daily.
Keep chemicals and sprays away from your cat’s face.
Book regular check-ups, especially for senior cats.

Cat Eye Care at Top Vet Clinic, Riyadh

At Top Vet Clinic in Al Rabwa, Makkah Road, we examine your cat’s eyes carefully, use fluorescein stain to detect ulcers, run the necessary tests in our in-house lab to find the cause, and build a safe treatment plan. Open Saturday to Thursday 9 AM to 12 midnight, Friday 4 PM to 12 midnight.

Frequently Asked Questions

Is brown discharge in the corner of my cat’s eye normal?
A small amount of dry brown discharge is usually normal. Heavy, yellow or green discharge, or discharge with redness or squinting, needs a check-up.

Are cat eye infections contagious to other cats?
Many are caused by viruses or bacteria that spread between cats, so isolate the affected cat and wash your hands until your vet identifies the cause.

Can I catch my cat’s eye infection?
Most causes are specific to cats, but good hygiene and handwashing always matter, especially for children and people with weak immunity.

Can I use human eye drops on my cat?
No. Some human drops are harmful to cats, and steroid drops can deepen a corneal ulcer. Use only what your vet prescribes after an exam.

Why does my Persian cat’s eye water all the time?
Usually because of the flat face and narrow tear ducts. Daily cleaning helps, but have it checked to rule out entropion or infection.

How long does treatment take?
Simple conjunctivitis often improves within days of the right treatment; ulcers and recurring cases need longer follow-up.

Book Now

Noticed redness, discharge or squinting in your cat’s eye? Book on WhatsApp, call 011 445 4433, or book your appointment here.