When to see a vet urgently
Contact a vet immediately if your cat has any of the following:
- An eye that remains closed, squints or waters continuously after injury.
- A visible wound, an embedded object or changed eye shape.
- Rapidly increasing cloudiness, marked redness or obvious pain.
- Sudden collisions or other deterioration in vision.
- Breathing difficulty or collapse alongside eye signs after an accident.
You can find a vet near you.
Overview
The cornea is the outer transparent layer with protective and optical functions. It is very sensitive and vulnerable. Injury breaks its surface, allowing infection to enter and ulcers to develop. In cats, injuries follow contact with other animals, plant thorns, foreign bodies or scratches.
An injury may be a superficial abrasion, deep ulcer or wound through the whole cornea. Beneath the surface epithelium lies the supporting layer, the stroma. The more stroma is lost, the weaker the eye's surface may become. Depth therefore matters more than how small a scratch appears to you.
A claw puncture may reach internal eye structures. Even without a visible object remaining, the wound may penetrate the cornea. A small external mark therefore does not guarantee a surface scratch alone. Examination also checks the lens when needed.
Causes
- Bites and scratches during fights.
- Blows and mechanical injury from objects.
- Foreign bodies, including sand, dust and plant awns.
- Road traffic accidents and falls.
- Complications of viral infections, such as FHV-1.
A herpesvirus corneal ulcer does not necessarily begin with mechanical injury. The virus can remain latent and reactivate later. Traumatic wounds and infectious ulcers may look similar, so observing a scratch, or not seeing one, does not establish the diagnosis alone.
Hairs rubbing the eye or an abnormal eyelid position may also sustain damage. If the irritant remains, treating the surface alone may not allow healing. The vet therefore examines the eyelids and surrounding area as well as the cornea.
Risk factors
- Outdoor access and free roaming.
- Kittenhood and young age, with play and fighting.
- Breeds with prominent eyes, including Persians and Exotic Shorthairs.
- Chronic conjunctivitis or viral infection.
Prominent eyes may have inadequate surface protection, and the eyelids do not always close completely. Short-muzzled animals may also have reduced corneal sensation, so even severe changes may cause less squinting than expected. Feline evidence about the magnitude of risk across every listed age and lifestyle group is incomplete. Indoor cats can sustain eye injuries too.
Typical symptoms
- Watering.
- Light sensitivity, with squinting and avoidance of bright light.
- Eyelid spasm (blepharospasm), keeping the eye closed.
- Corneal cloudiness or a patch.
- Conjunctival redness.
- Clear or purulent discharge.
- Loss of vision with severe injury.
Your cat may rub the eye with a paw or against carpet. Touching the area may be uncomfortable. Rubbing can worsen damage and is prevented in the way recommended by the vet.
A surface scratch may not be visible to the naked eye. Conversely, a cloudy patch alone cannot distinguish swelling, inflammation and an old scar. Do not try to judge depth or healing at home by forcing a painful eye open.
Complications and consequences
- Infection and inflammation of the damaged cornea.
- Ulcer formation.
- Corneal perforation.
- Scarring and loss of transparency.
- Partial or complete blindness.
Infection can rapidly break down the corneal supporting tissue, a process called corneal melting. A deepening ulcer may eventually perforate, allowing fluid from within the eye to leak out. A deep ulcer therefore needs different treatment from a surface abrasion.
A penetrating injury may involve internal inflammation or lens damage, increasing complication risks. A persistent feline ulcer may also develop a sequestrum, a brown or black area containing dead corneal tissue. This needs its own treatment assessment and must not be pulled away.
Diagnosis at the vet
- Eye examination.
- Fluorescein staining to identify erosions and ulcers.
- Slit-lamp examination.
- Assessment to exclude viral and bacterial eye infections.
Report when the accident occurred, the possible cause and anything already applied to the eye. Previous eye disease and current medicines also affect assessment. After a fall or road traffic accident, the whole cat is examined because other urgent injuries may accompany visible eye damage.
Fluorescein is a dye revealing disrupted corneal surface. Magnification and focused light help the vet assess extent and depth. The centre of a very deep lesion may stain differently from its edges. Leakage of fluid from the eye is checked when necessary.
Culture and cytology are useful for a suspected infected or rapidly deepening ulcer and guide medication selection. Herpesvirus PCR is interpreted alongside symptoms and examination: a positive sample may reflect low-level shedding rather than prove it caused this particular injury. Not every scratch therefore needs the same laboratory panel.
Treatment
Superficial damage can often be managed with medication and monitoring once the cause is removed. Treatment prevents or addresses bacterial infection and relieves pain. If herpesvirus is likely, an antiviral may be included. The vet selects products according to the findings.
A deep or melting ulcer may need treatment limiting corneal breakdown and very close monitoring. If the surface lacks support, surgery or a tissue graft may be needed to preserve structure. A penetrating wound may require surgical closure. Removal of an embedded foreign body is planned to minimise damage to internal structures.
Do not start leftover eye drops yourself. Corticosteroid drops may impair healing of an open ulcer. Topical anaesthetics used during examination are also unsuitable for repeated self-directed use because they can damage the cornea. Appropriate pain relief is chosen separately for the cat.
Home care and monitoring recovery
Keep your cat in a quiet, safe environment and prevent rubbing. Use the prescribed collar as directed. Do not try to remove an embedded object with tweezers or wipe the corneal surface. Contact the practice while arranging transport for instructions suited to the injury.
Ask for a practical demonstration of medication. Wash hands before and after giving it and do not touch the eye, eyelids or fur with the bottle tip. Report if your cat resists so strongly that medicine does not enter the eye. A safe solution can then be found when the agreed treatment cannot be delivered.
Record increasing squinting, redness, discharge or cloudiness. Persistent medicine-related irritation or worsening symptoms warrants advice before the next planned visit. New visual impairment or changed eye shape needs urgent assessment. Reduced watering alone does not prove wound closure.
Healing is confirmed at a check-up, often with repeat staining. Do not stop prescribed medication yourself even when the eye opens normally. A graft or sutures and internal inflammation may also need monitoring.
Prognosis
Superficial, uncomplicated injuries may heal well. Deep infection, an extensive scar or internal damage worsens the outlook. Scar location affects vision: central corneal cloudiness may interfere more than a small peripheral change. Urgent examination improves the chance of choosing appropriate treatment before damage worsens.
Prevention
- Prevent fighting and restrict free roaming.
- Protect your cat's eyes during plant trimming or cleaning.
- Arrange regular eye checks.
- Treat conjunctivitis and viral infections promptly.
A secure enclosure or supervised outdoor access reduces contact with other animals or sharp objects. Move your cat away during plant trimming and dusty work. Correcting a structural eyelid problem may prevent repeated rubbing, but regular checks cannot prevent every sudden accident.
Important for cat owners
Corneal injury must not be ignored. Even a small scratch can cause ulceration and vision loss. Remember that squinting, watering or keeping an eye closed requires an immediate veterinary visit, preferably to a vet experienced in eye disease.
This article provides general information and does not replace veterinary care. Contact a vet if you notice signs of illness in your cat.
Frequently asked questions
Can a small scratch puncture a cat's eye?
Yes. A sharp claw can penetrate the cornea. The external mark's size does not establish depth. A painful or squinting eye after injury needs urgent examination.
Does every corneal injury need surgery?
No. Superficial damage is often managed with medication and monitoring. Deep, melting or penetrating damage may need surgical support. Findings about depth and complications determine treatment.
Can I stop eye medicine once the eye looks well?
Do not stop prescribed treatment without veterinary instructions. Opening the eye and reduced pain do not establish surface closure alone. Follow-up helps confirm healing.
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
- Corneal Lacerations in Small Animals, Merck Veterinary Manual, accessed 2026-11-05.
- Corneal Ulcers in Cats, VCA Animal Hospitals, accessed 2026-11-05.
- Feline Corneal Ulcers: Diagnosis and Management, Today’s Veterinary Practice, accessed 2026-11-05.
- Deep Stromal Corneal Ulcers, Descemetocele, and Iris Prolapse in Small Animals, Merck Veterinary Manual, accessed 2026-11-05.
- Understanding Brachycephalic Ocular Syndrome (BOS), American College of Veterinary Ophthalmologists, accessed 2026-11-05.
- Applying Eye Drops to Cats, VCA Animal Hospitals, accessed 2026-11-05.
- GUIDELINE for Feline Herpesvirus infection, European Advisory Board on Cat Diseases, accessed 2026-11-05.
- Emergencies in Cats, VCA Animal Hospitals, accessed 2026-11-05.
- Corneal Ulcers, University of Missouri, accessed 2026-11-05.
- Penetrating Intraocular Injuries in Small Animals, Merck Veterinary Manual, accessed 2026-11-05.