Corneal burns in cats – symptoms, causes and emergency treatment

When to see a vet urgently

A chemical splash requires immediate flushing and contact with a vet. Also seek urgent care if:

Your cat keeps an eye closed, squints markedly or constantly rubs it.
The cornea becomes cloudy or a depression appears on its surface.
Vision suddenly worsens or eye shape changes.
A cat exposed to fire has breathing difficulty, severe weakness or altered consciousness.

Overview

The cornea is the transparent structure that refracts light. Damage is extremely dangerous because each lesion impairs transparency and therefore vision. Burns damage deeper structures as well as the surface layer, making them particularly serious.

However, injury depth varies. A mild injury may affect only surface cells, whereas a deep ulcer reaches the supporting corneal layer. Not every burn therefore damages internal eye structures or leaves permanent visual impairment. Prompt examination distinguishes superficial injury from deep, eye-threatening damage.

An intact surface protects underlying tissues. Once this barrier breaks, bacteria can enter the cornea and worsen the original injury. Cloudiness may reflect swelling or inflammation; it cannot measure ulcer depth at home.

Causes

Chemical burns:

Household chemicals, including detergents, acids and alkalis.
Aerosols and sprays.
Disinfectant solutions.

Thermal burns:

Fire, smoke and steam.
Hot liquids, including tea, soup and oil.
Sparks and welding.
Photochemical injury, less commonly, from prolonged exposure to ultraviolet or bright light.

Chemical injury severity depends on the substance and how long it remains on tissue. An alkaline substance can penetrate deeply, and the full injury may not be visible immediately. A product category alone does not establish how dangerous an individual splash is. Do not wait to identify the composition before starting flushing.

Risk factors

Accessible household chemicals.
Accidental hot liquid spills.
Open flames or heat sources, including fireplaces, candles, gas hobs and sauna stoves.
Inadequate supervision at home.
Strong disinfectants used without precautions.

An accident may also occur during cleaning or bathing when an irritant splashes into the eye. Evidence about burn frequency and the importance of every exposure situation in cats is limited; actual eye contact determines risk assessment.

Typical symptoms

Sudden profuse watering.
Squinting and light sensitivity.
Conjunctival redness and swelling.
A cloudy or pale patch on the cornea.
Eyelid spasm, with the cat resisting eye opening.
Clear discharge, or pus with secondary infection.
Reduced or lost vision with severe damage.

Your cat may rub the eye with a paw or press its face into carpet to relieve pain. This can add mechanical damage. Pus need not be visible, and you must not wait for it before seeking care. Improvement after flushing does not exclude corneal injury.

After a fire, eye symptoms may be only part of the problem. Facial burns, coughing, breathing difficulty or unusual weakness also require respiratory and general assessment. A smoke-exposed cat may deteriorate later, so flushing the eye alone is insufficient care for the whole accident.

Complications and consequences

Corneal ulceration.
Corneal perforation.
Chronic corneal inflammation.
A corneal scar, appearing as white cloudiness.
Blindness.

Infection in damaged cornea may activate tissue-destroying enzymes. This is called corneal melting: tissue softens and the ulcer can deepen rapidly. It differs from surface redness alone and may need very intensive treatment.

A scar's effect on vision depends on location and extent, among other factors. A large scar on the central visual axis impairs sight more than a small peripheral change. Not every cloudy area is a final scar because acute swelling also clouds the cornea.

Diagnosis at the vet

Slit-lamp eye examination.
Fluorescein staining to identify corneal damage.
Assessment of injury depth.
Exclusion of other injuries, including eyelid or conjunctival damage.

Report what happened, when exposure began and what has already been used to flush the eye. A product name, packaging information or label photograph helps assess chemicals. Gathering this must not delay first aid.

Fluorescein is a dye revealing corneal surface damage. Examination also assesses eyelids, conjunctiva and internal structures as the injury permits. If infection is suspected, cytology and bacterial culture may help select appropriate antimicrobials.

Staining is interpreted alongside corneal structure. The centre of a very deep ulcer may not take up dye like its edges. You therefore cannot judge safety from the amount of colour alone.

Squinting and watering do not prove a burn. A foreign body, eyelid rubbing or herpesvirus, for example, can cause a similar ulcer. Exposure history and examination of the whole eye help distinguish them.

Treatment

Treatment depends on burn severity:

Immediate, copious flushing with sterile saline.
Topical antibiotic drops or ointments to prevent infection.
Products supporting corneal healing.
Pain relief and anti-inflammatory medicines.
Surgery for deep damage, using corneal or conjunctival grafts.

Start copious flushing immediately after a chemical splash. If sterile saline is not readily available, use clean, lukewarm water instead of searching for it. Contact the practice at the same time and follow further instructions for the substance and your cat's condition. Flushing removes and dilutes the chemical but does not replace examination.

Do not try to neutralise alkali with acid or acid with alkali. The reaction may generate heat and worsen tissue damage. Do not put oil, skin cream or other household substances in the eye either. If a chemical has entered the mouth, do not induce vomiting because a corrosive substance damages tissue again on its way back.

Antibiotics prevent or treat bacterial infection of the damaged surface; they do not remove chemicals. A deep or melting ulcer may need other corneal-protective medication, hospital monitoring or surgery. A graft can support weakened cornea and help preserve the eye's structure.

Pain relief is selected for the cat. Corticosteroid eye medicines are not used on an open corneal ulcer, and repeated topical anaesthetic use may impair healing. Do not continue drops prescribed for an earlier eye disease at home without new instructions.

Treating the eye yourself with oils or home remedies can worsen damage.

Home care and check-ups

Prevent rubbing using protection recommended by the vet. A suitable collar may be needed. If your cat can still touch the eye or protection prevents eating, ask the practice for fitting advice.

Wash hands before and after giving eye medicine. Do not let the bottle tip touch the eye, eyelids or coat. Ask for a practical demonstration. Report unsuccessful administration so the method can be changed safely.

Record changes in squinting, discharge and cloudiness, and whether prescribed care succeeds. Increasing pain, redness or new visual impairment warrants contact before the scheduled review. Persistent marked irritation after medication also warrants advice.

Follow-up staining can check whether the surface has closed. Do not stop medication simply because the eye opens better. Superficial damage may heal well, but deep, infected or extensive injury needs longer care and may leave a scar. Follow-up intervals depend on progression.

Prevention

Keep household chemicals and detergents out of reach.
Do not leave hot liquids or open flames unattended.
Avoid strong aerosols near your cat.
Check the eyes after injuries or suspicious symptoms.

Move your cat away during cleaning and follow product instructions. Allow treated objects to dry and rinse as directed before the cat returns. Keep substances closed and do not mix cleaning chemicals. Prevent splashes and residues when cleaning the animal's own equipment too.

Important for cat owners

A corneal burn is a dangerous eye injury requiring urgent help. Remember that even suspected burns warrant immediate flushing with saline or clean, lukewarm water and veterinary care as soon as possible. Earlier treatment improves the likelihood of preserving vision.

This article provides general information and does not replace veterinary care. If you suspect an eye injury, contact a vet immediately.

Frequently asked questions

Can I flush my cat's eye with tap water?

After a chemical splash, clean, lukewarm water is suitable immediate first aid if saline is unavailable. Do not delay flushing to obtain supplies. Veterinary assessment is still needed afterwards.

Can a corneal ulcer be seen with the naked eye?

Not always. A small surface lesion may appear only with fluorescein staining. A squinting or painful eye needs examination even when it looks clear to you.

Does every burn need surgery?

No. Superficial damage can often be managed with medication and monitoring. A deep ulcer or risk of perforation may require surgery. Findings, infection and healing progress guide the decision.

This article is for general information only and is not a guide to treatment. If you notice the first signs of illness, contact your vet.

Paw4care editorial team

Sources

Toxicoses From Corrosive Agents in Animals, Merck Veterinary Manual, accessed 2026-11-05.
Corneal Ulcers in Cats, VCA Animal Hospitals, accessed 2026-11-05.
Disorders of the Cornea in Cats, Merck Veterinary Manual, accessed 2026-11-05.
Corneal Ulcers, University of Missouri, accessed 2026-11-05.
Feline Corneal Ulcers: Diagnosis and Management, Today’s Veterinary Practice, accessed 2026-11-05.
Applying Eye Drops to Cats, VCA Animal Hospitals, accessed 2026-11-05.
Smoke Inhalation in Cats, VCA Animal Hospitals, accessed 2026-11-05.
About Cleaning and Disinfecting Pet Supplies, CDC, accessed 2026-11-05.

Corneal burns in cats: symptoms, causes and emergency treatment