Red Eye in Cats

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Red Eye in Cats

By: Dr. Rhea Morgan

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Section: Veterinary Care In-depth

Diagnosis In-depth

Veterinary care includes diagnostic tests to determine the underlying cause of the red eye and guide subsequent treatment. Your veterinarian will do a complete medical history and physical examination to determine if the problem involves only the eye(s) or whether other changes are present in the animal.

A complete ophthalmic examination is required to determine the source of the redness and whether it involves inflammation of the external structures of the eye or the internal structures. Your veterinarian may refer your cat to a veterinary ophthalmologist for further evaluation using specialized instrumentation. The following tests may be performed during the eye examination:

Schirmer tear test to measure tear production

Fluorescein staining of the cornea to check for ulcers

Tonometry to measure the pressure within the eye

Examination of the interior of the eye under magnification

Taking scrapings of inflamed tissues (such as conjunctiva and cornea) for cytologic studies to determine the type of inflammation present

Examination of scrapings of the eyelids to look for parasites

Submission of samples for culturing bacteria and other agents

Biopsy of masses around the eye

If uveitis is the suspected diagnosis or if your pet appears unwell, then further tests are indicated to identify diseases that are systemic (involve other systems). Common tests include a complete blood count, biochemistry profile, serum tests for tick borne diseases, systemic fungal infections, and toxoplasmosis, and possibly X-rays of the chest and abdomen.

Treatment In-depth

Exact treatment requires establishment of a diagnosis.

An Elizabethan collar may be applied to protect the eye. Ocular inflammation may be irritating and your pet can cause more serious injuries to their eye if they scratch it with their paws, or rub it against carpet or furniture.

Infectious agents can be the cause of conjunctivitis, especially in cats, and can worsen ocular inflammation in all animals. Therefore, your veterinarian may prescribe a topical antibiotic or antiviral medication to treat or prevent infection.

Lubricant eye drops or ointments may be prescribed to reduce the dry feeling associated with some surface eye inflammation or to treat any deficiency in the watery tears (dry eye).

Numerous topical anti-inflammatory preparations can be used to diminish inflammation (redness) in the eye. It is important to reiterate that although they may make the eye appear better, these treatments are non-specific and do not replace treatment of the inciting cause. They can also exacerbate a pre-existing condition or lead to other complications. They should be instituted only upon direction of your veterinarian.

Topical corticosteroids are the most commonly used class of anti-inflammatory agents for non-infectious forms of conjunctivitis, keratitis and anterior uveitis.

Nonsteroidal anti-inflammatory drugs (NSAIDs) are a second class of anti-inflammatory drugs, and may be used sometimes in the presence of certain infections.

Topical antihistamines may be tried to control inflammation associated with allergies, but they frequently contain other products (vessel constricting agents) that can be irritating to animals.

Occasionally systemic anti-inflammatory medications are used in conjunction with topical medications. These include antihistamines for the treatment of allergic conditions, oral NSAIDs to alleviate pain and inflammation inside the eye, and oral corticosteroids. The use of these products depends on the underlying cause of the red eye. It is important to note that systemic corticosteroids should not be used if infectious diseases such as feline herpesvirus or fungal infections are the source of the redness.

Swollen tissues may respond to warm, wet compresses.

Other treatments may be administered, depending upon the underlying cause.

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1 Ocular (Eye) Pain and Squinting in Cats
Eye pain can be difficult to detect. Sometimes, cats will squint. Other, more subtle signs of eye pain, include sleeping more, hiding, decreased appetite, reduced playfulness and aggression.
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1Corneal Ulceration in Cats
Corneal epithelium is constantly being lost and replaced, and its health and thickness depend on a delicate balance between cell loss and regeneration. Corneal ulcers represent either excessive loss or...
Read More
2Epiphora (Excessive Tearing) in Cats
Epiphora is an abnormal overflow of tears down the face that results from either obstruction of tear drainage through the tear duct system or overproduction of tears that overwhelms the normal drainage...
Read More
3Glaucoma in Cats
Inside the normal eye there is constant production and drainage of a watery fluid. When a problem with the drainage of the fluid occurs, the pressure inside of the eye can increase. High pressure causes...
Read More
4Ocular (Eye) Discharge in Cats
Eye discharge is a principal sign of eye disease. Abnormal discharges may develop suddenly or gradually. In general, the greater amount of discharge, the more serious the eye disease.
Read More
5Ocular (Eye) Pain and Squinting in Cats
Eye pain can be difficult to detect. Sometimes, cats will squint. Other, more subtle signs of eye pain, include sleeping more, hiding, decreased appetite, reduced playfulness and aggression.
Read More
6Conjunctivitis in Cats
Conjunctivitis is an inflammation of the conjunctiva, which is the inner lining of the eyelids and extends from the tear duct to the outer edge of the eye. It is a common eye problem in cats and usually...
Read More

Red Eye in Cats

Red Eye in Cats

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