What can cause eosinophilic keratitis?

Eosinophilic keratitis is often associated with immune reactions, allergies, or certain infections. Your vet will recommend cytology and infectious disease testing to identify a possible cause and guide treatment accordingly.

How long does it take to see improvement with treatment?

The time to improvement varies with severity. Some cats show reduced symptoms within a few days, but full control and recovery may take several weeks to months. Follow your vet's recommended check-up schedule.

What home care can help my cat recover?

At home, prevent your cat from rubbing its eye, keep the eye area clean, and administer prescribed drops or medications as directed. If symptoms worsen or do not improve, return to the vet promptly.

How much do the tests and treatment usually cost?

Costs vary by clinic and region — ask your vet for an estimate before proceeding.

Disease Guide

Feline Eosinophilic Keratitis in Cats: Symptoms, Diagnosis & Treatment [2025]

Feline eosinophilic keratitis may be associated with herpesvirus and presents as white corneal plaques and vascular proliferation. Treatment focuses on topical corticosteroids and antiviral medications; most cases can be managed but recurrence is common.

Take 1 minute to check the symptoms first

Last updated: 2025/12/16

Pethealthmap Editorial Team

Sources: ISFM, AAHA, National Taiwan University Veterinary Hospital

When to See a Vet

Seek emergency veterinary care immediately

•Eye remains persistently closed with obvious swelling
•Continuous heavy discharge of bloody or purulent secretions
•Change in eye shape or signs of protrusion

Schedule a clinic visit soon (within 24–72 hours)

•Frequent eye rubbing or persistent blinking lasting more than one day
•Unilateral discharge or noticeable change in discharge color
•Decreased appetite or significantly reduced activity

01What symptoms indicate a problem?

Eosinophilic keratitis commonly causes eye redness, localised swelling, and thick discharge, and may affect vision and behaviour.

White or thick, sticky discharge on the surface of the eye
Visible swelling or raised lesions on the cornea or conjunctiva
Frequent pawing at the eye, persistent blinking, or keeping the eye half-closed
Corneal opacity or noticeable changes in vision, such as bumping into furniture

Seek emergency care immediately if you notice the following symptoms:

⚠️ Unable to open the eye or severe swelling
⚠️ Continuous heavy blood-tinged or purulent discharge
⚠️ Obvious change in eyeball shape or protrusion

02How to assess the situation at home: key observations and when to seek emergency care

Observing and recording details at home helps your vet quickly understand the progression and possible causes.

Note when symptoms first appeared and how they have changed over time
Take close-up photos and short videos of the eye with your phone (front and side views)
Observe the colour and amount of discharge and any differences between the two eyes
Monitor appetite, alertness, and activity levels for any changes
Weigh your cat and track any changes in body weight and daily water intake
List all current medications, eye drops, and supplements your cat is receiving

03How will the vet make a diagnosis? Common examination procedures

A thorough ophthalmic examination will be performed at the clinic, with cytology and infectious disease testing arranged as needed.

Comprehensive ophthalmic examination

including slit-lamp biomicroscopy and fluorescein staining to assess corneal damage

Cytology

discharge or swab samples examined to identify the type of inflammatory cells

PCR or culture testing

to rule out viral or specific pathogen infection

Advanced imaging (e.g. CT scan) if needed to evaluate deeper lesions

Blood and biochemistry panels

to assess overall health and treatment tolerance

04Treatment and care after diagnosis: medications, dietary adjustments, and home care guide

Treatment focuses on controlling inflammation and concurrent infection with medication, with regular follow-up visits to monitor corneal healing and vision.

Topical medications (such as corticosteroids) prescribed following veterinary assessment
Antibiotics or immunomodulatory treatment added as needed
Schedule regular check-ups to monitor corneal healing and any changes in vision
Home care: prevent your cat from rubbing its eye and keep the area around the eye clean
If symptoms do not improve or recur, referral to a veterinary ophthalmologist is recommended

05What to prepare before your vet visit: key information to help the vet identify the cause quickly

Record when symptoms started, how they developed, and any day-to-day changes

Have eye photos or short videos ready on your phone for the vet to review

Write down notes on appetite, urination, defecation, alertness, and activity level

List all current medications, drops, and supplements by name

Bring any previous examination reports or vet instructions if available

Use a secure and comfortable carrier, and book an appointment with your vet or specialist in advance

This content is for reference only and cannot replace a professional veterinary diagnosis. If your pet shows signs of illness, please seek veterinary care promptly.