Uveitis in cats: causes, symptoms, treatment and home care

Caring for a cat means providing it with everything it needs to live as long and healthy a life as possible. But unfortunately, simply offering a good home, quality food, and plenty of love isn't enough to completely protect it from illnesses and accidents.

Microorganisms and other harmful agents are always lurking, waiting for the opportunity to enter the body of our beloved feline friend. While some are more harmless than others, uveitis in cats is one of the most common and serious eye diseases, and it's important to understand it thoroughly so you know what steps to take to help your cat from the very beginning.

What is uveitis in cats?

Uveitis is an inflammatory eye disease that affects the uveal tract , also called the uvea. The uvea is the middle vascular layer of the eye and is made up of three main structures:

• Iris: the colored part of the eye, which regulates the amount of light that enters by contracting or dilating.
• Ciliary body: structure located behind the iris that produces the aqueous humor (the internal fluid of the eye), contributes to the focusing of the lens and helps to lubrication and nutrition of the aforementioned structures.
• Choroid: a layer very rich in blood vessels, located between the sclera (the white part) and the retina, which nourishes the internal structures of the eyeincluding the retina.

When one or more of these structures become inflamed, it's called uveitis. Due to its highly vascularized structure, the uvea is very vulnerable to infections, trauma, and immune-mediated processes . In severe cases, or if left untreated, the cat could become partially or totally blind . That's why it's so important to take your cat to the vet as soon as you notice the symptoms mentioned below.

Furthermore, feline uveitis is not just an eye problem: it is frequently a manifestation of an underlying systemic disease (viral, parasitic, tumorous, or immune-mediated). Therefore, it should always be considered a warning sign that requires a thorough examination of the animal.

What types of feline uveitis are there?

There are three main types of uveitis, depending on the affected area of ​​the eye. Understanding this classification helps explain why the veterinarian focuses on certain structures when examining a cat's eyes.

• Anterior uveitisIt primarily affects the iris and ciliary bodies. It is the most frequent and easiest to recognize form in the clinic, because the changes are observed in the front of the eye (red eye, very constricted pupil, pain).
• Intermediate uveitisIt affects the posterior portion of the ciliary bodies and often goes unnoticed, as the external signs may be less noticeable. It usually requires more specific explorations, such as ultrasound or specialized imaging techniques.
• Posterior uveitisIt primarily affects the choroid and may be accompanied by retinal abnormalities (edema, hemorrhages, detachment). It is sometimes included within the term chorioretinitisIt can be present even when the visible part of the eye appears almost normal.

When the entire uvea becomes inflamed, it is called panuveitis , a more extensive and serious form in which all three areas (iris, ciliary body, and choroid) are affected. In any of its forms, the goal of treatment will always be to reduce inflammation and pain , and to prevent complications such as glaucoma, cataracts, or retinal detachment.

What are the causes of uveitis in cats?

Uveitis in cats can be caused by endogenous or exogenous factors . Endogenous factors result from a weakened immune system or internal illnesses within the animal; exogenous factors are related to trauma, injuries, or eye surgery . In a significant percentage of cases, despite all tests, the cause may remain idiopathic (unknown), but it is still essential to treat the inflammation.

Endogenous (internal or systemic) causes

It is estimated that approximately 70% of feline uveitis cases are related to systemic infectious, immune-mediated, or neoplastic diseases. Among the most important are:

• Feline Infectious Peritonitis Virus (FIP)Feline coronavirus infection, caused by a mutated feline coronavirus, can produce uveitis, especially in its non-effusive form. It is often accompanied by other signs such as persistent fever, weight loss, or neurological abnormalities.
• Feline Leukemia Virus (FeLV): a virus that affects the immune system and bone marrow. It can predispose to ocular lymphomas and cause uveitis due to tumor infiltration or immune alterations.
• Feline Immunodeficiency Virus or Feline AIDS (FIV): weakens the immune system and predisposes to secondary infections and chronic inflammatory processes that can manifest in the eyes.
• Systemic toxoplasmosis: caused by the parasite Toxoplasma gondii. It can produce uveitis, chorioretinitis and other eye injuries, in addition to neurological, respiratory or muscular signs.
• Systemic mycosesFungal infections that, in some geographical areas, can cause uveitis and other eye injuries, although in certain countries their frequency is low.
• Other infectious or parasitic causes: such as certain bacteria or nematodes, which, although less frequent, can also trigger inflammation of the uvea.
• Immune-mediated or autoimmune processesThe cat's own immune system attacks structures of the eye without a clear infectious cause, resulting in uveitis that can be chronic and recurrent.
• Neoplasms (tumors)especially the ocular lymphoma, whether primary to the eye or metastatic from other locations in the body.

Exogenous causes (traumatic and others)

Exogenous causes are associated with accidents, fights, or trauma suffered by the cat. Any significant wound can cause uveitis by damaging ocular structures or allowing microorganisms to enter.

• Direct eye trauma: blows, falls or strong pinches to the head or eye area.
• Wounds from bites or scratches in fights with other cats or other animals, especially in cats that go outdoors.
• Intraocular foreign bodies: ears of corn, plant fragments, pieces of metal or any object that penetrates the eye.
• Post-surgical reactionsInflammation following certain eye surgeries (e.g., cataract surgery), which in some cases can develop into uveitis if not properly controlled.

In many cats, despite testing, a clear cause cannot be identified . In these cases, uveitis is considered idiopathic, but anti-inflammatory and analgesic treatment remains essential to preserve the animal's vision and comfort.

What are the symptoms of uveitis in cats?

The symptoms of uveitis in cats can vary depending on the part of the eye affected and the severity of the inflammation. Some signs are very obvious to the caregiver, while others are only detected through a thorough eye examination.

The most common symptoms you may observe at home are the following:

• PhotophobiaThe cat moves away from light, seeks dark places, or closes its eyes to avoid it. Any change in its relationship with light should raise suspicion of an eye problem.
• Excessive tearingIt produces a lot of tears to try to keep the eye dry and relieve discomfort. It may resemble conjunctivitis, but the cause is internal (inflammation of the uvea).
• Pain and hypersensitivity in the eye areaWhen you pet him in that area, he may whine, quickly pull away, or become irritable. Sometimes all you notice is that keeps the eye half-closed or blinks frequently (blepharospasm).
• MyosisThis is an abnormal constriction of the pupil. You will see that the affected eye has a smaller pupil and the eyelid is somewhat more closed than the healthy side.
• Retraction of the eyeball: the eye may be "sunken" into the orbit, a typical sign of intense pain.
• Changes in the color or appearance of the eye: eye that is redder, cloudy in appearance, with spots or deposits on the cornea or changes that resemble cataracts.
• Appearance of associated eye diseasesCataracts, glaucoma, or retinal detachment are the most common complications when uveitis is not well controlled.

In posterior uveitis, the veterinarian may also observe retinal edema, hemorrhages, or even retinal detachment , which can lead to sudden blindness. Sometimes, uveitis is very mild or localized in inconspicuous areas and is only detected during routine checkups ; this is why regular checkups are so important, especially for older cats or those with chronic illnesses.

Veterinary diagnosis of feline uveitis

If you notice any of the symptoms we've mentioned, you should take your cat to the vet as soon as possible. Uveitis is an ophthalmological emergency because every day that passes without treatment increases the risk of irreversible vision damage.

At the clinic, the veterinarian will ask you a series of questions to determine how long your cat has been like this, whether it has had an accident or fight, whether it goes outside, and if you have noticed any changes in its routine or behavior. Then, they will meticulously examine its eyes and assess the animal's overall health.

To arrive at a reliable diagnosis, the veterinarian may use various tools and tests:

• Slit lampIt allows for detailed observation of the iris, cornea, anterior chamber, and lens, detecting inflammatory deposits, opacities, or synechiae.
• Tonometer: measures the Intraocular pressureIn uveitis it is usually decreased (ocular hypotension), unlike in glaucoma, where it is elevated.
• Direct or indirect ophthalmoscopyThis test is used to examine the fundus of the eye, the retina, and the optic nerve. It is essential for assessing whether uveitis is posterior or if there are complications such as retinal detachment.
• Ocular ultrasound or advanced imaging techniques: very useful when there are opacities (cataracts, bleeding) that prevent a good view of the inside of the eye.
• Blood tests and serology: to investigate diseases such as FeLV, FIV, toxoplasmosis, FIP or other systemic processes that may be the cause of uveitis.
• Other specific analysesDepending on the case, these may include aqueous humor analysis, body imaging tests, or biopsies if a tumor is suspected.

All these tests not only confirm uveitis, but also guide the search for the underlying cause , which is key to establishing a truly effective treatment and preventing relapses.

How is uveitis treated in cats?

Once the veterinarian has confirmed the diagnosis, treatment should always address two fronts: controlling eye inflammation and pain , and treating, as far as possible, the underlying disease causing the uveitis.

After the examination and initial tests, the professional will prescribe the appropriate treatment . This treatment may include:

• Eye drops with anti-inflammatory corticosteroids (provided there is no corneal ulcer) and not corticosteroids, which prevent inflammation from worsening and help preserve the structure of the eye.
• Drops or medication to dilate the pupil (mydriatics), which decrease the pain associated with iris spasm and prevent the formation of synechiae (adhesions between iris and lens).
• Systemic analgesics If the cat is in pain, always seek the animal's maximum comfort and avoid unnecessary suffering.
• Antibiotics, antivirals, antiparasitics or antifungals depending on the specific cause if an infection has been identified.
• Immunomodulators or immunosuppressants in autoimmune processes or chronic inflammations where the immune system is heavily involved.
• Surgical intervention If the cat has suffered any severe trauma and presents perforations in the eye, foreign bodies or sequelae that cannot be solved with medication alone.

It is very important to follow the veterinarian's instructions precisely , respect the schedule for eye drops and oral medications, and attend all follow-up appointments. Treatment typically lasts several weeks , and anti-inflammatory medications are usually withdrawn gradually to prevent relapses.

In some cases, especially when uveitis is associated with serious diseases such as FIP or lymphoma, the prognosis is more guarded, but even so, treatment aimed at controlling inflammation and pain can greatly improve the cat's quality of life.

What care should be given to a cat with uveitis?

Once your veterinarian has diagnosed your cat with uveitis, in addition to administering the prescribed medication, you'll need to do everything possible to ensure your cat can live as normal and comfortable a life as possible . Eye diseases often take a long time to heal, even when detected early, so patience is key , and above all, try to maintain a calm and peaceful home environment.

Some practical recommendations for everyday life are:

• Create a quiet space with soft lighting where the cat can rest without disturbances or surprises.
• Prevent him/her from having access to very bright areas or direct exposure to the sun during the acute phase of the disease, as intense light increases eye pain.
• Keep your feeding routine as stable as possible, offering tasty food and fresh water so that it does not lose weight or become dehydrated.

Therefore, it's a good idea to increase the number of cuddle sessions (provided your furry friend wants it, of course, since you shouldn't overwhelm them), and also the number of days you give them a special treat , like the can of chicken or tuna they love so much. We all know that a sick person who feels comforted and loved recovers much better; the same is true for cats. A cat that has reasons to keep going, like a human family that cares for them, will find the strength to live.

However, certain precautions must be taken:

• Do not pet his face excessively and, above all, Avoid touching the area near your eyesbecause you could hurt him even if you do it with love.
• If your veterinarian has instructed you to do so, place a elizabethan necklace to prevent scratching or rubbing the eyes, which can greatly worsen inflammation or even cause ulcers.
• Respect rest periods and don't force him to play when he doesn't feel like it; adequate rest It is a fundamental part of the recovery.

In addition, you should wash your hands before and after applying the eye drops to avoid potential infections. Place the cat in a stable position, hold it gently but firmly, and apply the drops without letting the tip of the bottle touch the eye or the surrounding fur. This will protect your sick cat's health and reduce the risk of contaminating the medication.

Most cases of uveitis can be controlled or significantly improved provided that the appropriate treatments are started in a timely manner, proper veterinary follow-up is carried out, and a safe, calm, and loving environment is maintained at home for the feline.