Squinting (Blepharospasm) in Cats

Blepharospasm is a broad symptom that is seen as a feature of different underlying diseases in cats, including injury, infection, inflammation, and developmental abnormalities
Cats with blepharospasm present with significant, recurrent closure of one or both eyes
While all cats blink or squint occasionally, particularly in bright light, true blepharospasm is an obvious, persistent abnormality
In many cases cats keep the eyelids of the affected eye completely shut
Investigation involves physical and ophthalmic examination
Treatment depends on the underlying disease process but often includes topical eye drops or medications such as anti inflammatories, pain relief, steroids, antibiotics, and eye lubricants
Prognosis varies; most cases resolve with treatment, but some underlying conditions result in severe disease and loss of the eye

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A closer look: Squinting (Blepharospasm) in Cats

Blepharospasm is a common presentation in cats that normally indicates pain in or around the eye. Severe blepharospasm makes examination of the eye difficult and sometimes conceals severe underlying injury.

Triggers of blepharospasm are rarely life-threatening but are usually painful and require prompt veterinary attention to avoid further damage to the eye and potential blindness.

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Possible causes

Blepharospasm is associated with a number of different conditions.

Examples include

Bacterial conjunctivitis

Chlamydia infection

Calicivirus infection

Uveitis in Cats Allergies in Cats

Insect bite hypersensitivity

Injuries

Eyelash and Eyelid Disorders in Cats Coloboma in Cats Cherry Eye (Prolapsed Third Eyelid Gland) in Cats

Risk factors

The severity of blepharospasm varies significantly depending on the severity of the underlying trigger.

Mild disease such as allergic conjunctivitis results in mild symptoms, and sometimes resolves without intervention. Injuries, such as a penetrating foreign body to the eye, results in severe pain and persistent blepharospasm.

Blepharospasm may affect one or both eyes. Injuries normally affect one eye, whereas blepharospasm of both eyes often indicates infections such as calicivirus.

Testing and diagnosis

Investigation of blepharospasm involves:

Physical examination
Ophthalmic examination, often under sedation for a full examination, and includes fluorescein staining, measurement of intraocular pressure, and measurement of tear production
Bloodwork
Testing for specific bacteria or viruses

Treatment options vary depending on the underlying disease. Medications may be topical or systemic. Common options include: