Symptoms and Causes of Blepharospasm

Chihuahua with eyes closed inf ield of flowers
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Blepharospasm is a condition that causes a rapid blinking of the eye due to involuntary contractions of the orbicularis oculi muscle of the eyelid.1 This is a quick type of spasm which sometimes appears as if the eyelid is closed. The pet's eye may tear and he may be reluctant to look at bright lights in addition to the swift blinking. If you notice blepharospasm in your dog or cat, and is it an emergency or is treatment necessary?

Here's more information on this medical condition.

Is Blepharospasm a Disease?

Blepharospasm is not a disease in and of itself; in most cases, it is a clinical sign that something is wrong with the eye or eyelid. Some cases may involve only the fifth cranial nerve (trigeminal nerve) or neither the eye nor the trigeminal nerve (essential blepharospasm).2

In most cases of blepharospasm seen in dogs and cats, the eye has been injured or infected and most often it is painful.

Symptoms of Blepharospasm

The affected eyelid will usually look red and swollen, and the dog will squint or blink spasmodically. The eye will often be itchy and the dog will scratch or rub at its face or eyelids, which can also damage the surrounding tissues. You may also notice a discharge from the eye that can be clear or contain pus. The skin over the eyelids may be crusty or flaky with small pustules, like pimples on the surface.

Blepharitis can affect one or both eyes.

Causes of Blepharospasm

Any condition that irritates the eyelids can result in blepharitis, including:

  • Congenital abnormalities: Congenital abnormalities can also make a dog prone to blepharitis include entropion, a condition in which the eyelid edges turn inwards, along with abnormalities of the eyelash in which they grow towards the eye instead of out.
  • Allergies: Allergies to insect bites and allergens that are inhaled can also cause blepharitis.
  • Shape of a dog's face and muzzle: Facial folds, long and narrow muzzles, and short flat faces predispose dogs to developing blepharospasm.

  • Infections: Bacterial infections such as staph, abscesses of glands in the eyelids and occasionally, a fungal infection can lead to blepharospasm.
  • Tumors: Tumors that are located in the meibomian glands can be benign adenomas or malignant adenocarcinomas. A mast cell tumor can also cause blepharitis.
  • Inflammatory disorders
  • External trauma to the eyelids
  • Localized mange (caused by mites)
  • Nutritional disorders
  • Endocrine problems including hypothyroidism, Cushing's disease or diabetes
  • Environmental irritants such as tobacco smoke
  • In some cases, no underlying cause can be found and the blepharospasm is deemed idiopathic.

Treatment of Blepharospasm

Treatment to reduce the inflammation involves applying warm compresses several times per day and removing discharges with saline eye drops. Additional specific treatment will depend on the diagnosis of the underlying cause.

NOTE: Diseases of the eye can worsen quickly; it is important to see your veterinarian as soon as possible if you notice your pet squinting, showing tearing or other discharge, or experiencing blepharospasm of the eye(s).

References:
1 blepharospasm. (n.d.). Merriam-Webster's Medical Dictionary. November 10, 2006, from Dictionary.com: http://dictionary.reference.com/browse/blepharospasm

2 Dorland's Illustrated Medical Dictionary, Twenty-sixth Edition.

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