Squinting (Blepharospasm) in Cats — Symptom Decision Guide

Quick, practical guide to what feline squinting (blepharospasm) can mean, likely causes, home checks, decision tree and when to seek urgent vet care.

Quick Assessment

Is this an emergency?

- Yes: if your cat has sudden severe eye pain (constant squinting with pawing at the eye), cloudy or blue cornea, sudden vision loss, blood in the eye, a very dilated or nonresponsive pupil, or systemic signs (high fever, severe lethargy). Seek emergency veterinary care now.

- No (but urgent): if squinting is new or persistent more than 24 hours, shows colored discharge, or is accompanied by swelling and reduced appetite — schedule same-day or next-day vet review.

Most common cause: corneal irritation/ulcer or conjunctivitis (including feline herpesvirus flare) — both commonly cause a cat to squint.

When to see a vet: any new, persistent, or worsening squinting — especially unilateral, painful-looking, or with other eye signs (discharge, cloudy cornea, pupil changes).

What "squinting" looks like

Squinting in cats (blepharospasm) is a partial or complete closure of the eyelids. Owners may notice:

• Narrowed eyes or holding one eye closed much of the time
• Rapid blinking or keeping the eyelids tight
• Pawing at or rubbing the eye
• Increased tear production (watering) or thick/yellow discharge
• Avoidance of light or increased hiding

Possible causes (ranked common → rare)

Why squinting always warrants examination

• The eye can deteriorate quickly: corneal ulcers can progress to deep infections that threaten vision within 24–72 hours.
• Some treatments (e.g., topical corticosteroids) can make certain conditions (herpesvirus ulcers, corneal ulcers) much worse — a vet must inspect before starting therapy.
• Cats hide pain. Persistent squinting often indicates moderate to severe discomfort needing professional management.

Decision tree — common presentations and actions

If you see any of these combinations, use the likely cause and action as a guide. These are not diagnoses — they help prioritize veterinary attention.

• If squinting + sudden onset after outdoor activity + one eye only + pawing at the eye → likely foreign body (or corneal scratch) → action: do not poke; gently flush with saline if you are trained, otherwise keep the cat calm and see a vet same day.

• If squinting + clear watery tearing + occasional sneezing or upper respiratory signs + recurrent episodes → likely herpesvirus conjunctivitis or chronic conjunctivitis → action: schedule a vet visit within 24–48 hours; avoid topical corticosteroids unless cleared by vet.

• If squinting + thick yellow/green discharge + swollen eyelids → likely bacterial conjunctivitis or secondary infection → action: see vet within 24 hours for exam and appropriate topical/systemic therapy.

• If squinting + visible corneal defect, cloudiness, or blue/white cornea + extreme pain/pawing → likely corneal ulcer or deep corneal injury → action: emergency vet within 24 hours (often same-day).

• If squinting + small (constricted) or irregular pupil + eye appears inflamed deep in the eye + sensitivity to light → likely uveitis → action: urgent vet evaluation (same-day to 24 hours) to diagnose and start anti-inflammatory therapy and pain control.

• If squinting + cloudy/bluish cornea + sudden decreased vision or enlarged globe + nonreactive or mid-dilated pupil → likely acute glaucoma → action: emergency veterinary care now (risk of permanent vision loss).

Home assessment steps (what to check, what to measure)

Do these calmly and briefly — do not force the cat. If your cat resists strongly, stop and seek veterinary care.

Keep a short video or photos — these can help your veterinarian assess progression.

When It's an Emergency — red flags

Seek emergency veterinary care immediately if your cat has any of the following:

• Intense, persistent squinting with continuous pawing at the eye
• Sudden loss of vision (bumping into objects, disorientation)
• Cornea that looks cloudy, blue or gray, or a visible white spot
• A very dilated or fixed (nonreactive) pupil or an unusually small (pinpoint) pupil
• Blood inside the eye (red/brown color) or large amounts of blood around the eye
• Eye protrusion or the eye looks swollen and bulging
• Fever above 104°F (40°C), severe lethargy, or obvious systemic illness

When to Schedule a Vet Visit (non-urgent but needed)

Make an appointment within 24–48 hours if you see:

• New but mild squinting with watery discharge and no other severe signs
• Recurrent mild squinting (previous history of herpesvirus or chronic conjunctivitis)
• Thick discharge but the cat is eating and active
• Any squinting that has lasted more than 24 hours

Home care (safe, temporary measures)

Do only the following until a veterinarian examines the eye:

• Keep the cat calm and confined to a dim, quiet room to reduce light sensitivity and injury.
• Gently wipe away loose discharge with a clean, damp (sterile) gauze or cloth — always from the corner near the nose outward; use a separate piece for each wipe.
• Artificial tears (preservative-free) can be applied every 4–6 hours to keep the surface lubricated if you have them and your vet agrees.
• Prevent rubbing: use a soft recovery collar if the cat will tolerate it, but do not force a collar if it causes panic.
• Never apply human eye drops or ointments (especially steroid-containing products) unless specifically instructed by a veterinarian — they can worsen ulcers or infections.
• Do not try to remove an embedded foreign body. If a visible object is easily and gently removable without touching the surface of the eye, you may attempt saline flushing; otherwise seek professional help.

What to tell your vet (helpful information to prepare)

Bring or be ready to share these details — they speed diagnosis:

• Onset: when did you first notice squinting? Has it been continuous or intermittent?
• Which eye: left, right, or both?
• Discharge type: clear/watery, mucous/stringy, or thick/yellow-green?
• Behavior changes: appetite, activity, hiding, vocalizing, or pawing?
• Recent events: trauma, outdoor access, fights, foreign body exposure (gardening, grass awns), or chemical exposure?
• Medical history: prior eye disease (corneal ulcers, glaucoma, uveitis), FHV (feline herpesvirus) history, prior eye surgeries, and current medications (especially topical steroids or immunosuppressants).
• Vaccination status: particularly for herpesvirus/respiratory pathogens.
• Any home treatments already tried: saline flush, drops, ointments (names & timing).
• Photos/videos: a short video of the eye at rest and while blinking can be extremely helpful.

How vets will evaluate (briefly)

Expect an ophthalmic exam that may include fluorescein staining (to detect corneal ulcers), measurement of intraocular pressure (tonometry), slit-lamp or magnified exam of the cornea and anterior chamber, and possibly tests for infectious causes (PCR or culture) or bloodwork if systemic disease is suspected. Treatments vary widely depending on the cause — from topical lubrication and antivirals or antibiotics to systemic anti-inflammatories, pain control, or urgent surgery.

Bottom line

Squinting is a sign of ocular discomfort and should not be ignored. Quick triage at home (observe discharge, pupil size, corneal appearance, behavior, and temperature) will help you decide whether immediate emergency care is needed. Because many eye conditions can progress rapidly and some treatments can be harmful when misapplied, a veterinary examination is the safest next step.

Sources and further reading

• Merck Veterinary Manual — Ocular and periocular diseases; corneal ulceration and uveitis (Merck Vet Manual is a trusted clinical reference for veterinary ophthalmology).
• Cornell University College of Veterinary Medicine — Feline Health information (clinician-reviewed pet owner resources).

Frequently Asked Questions