Cat uveitis is inflammation inside the eye that looks like a red, hazy, painful eye with a small or oddly shaped pupil — and in cats it is the leading sign of underlying infectious or immune-mediated disease. Roughly half of cats with anterior uveitis have a systemic cause such as feline infectious peritonitis, toxoplasmosis, FeLV, FIV, or lymphoma rather than a simple eye problem (Powell & Lappin, 2001, Vet Ophthalmology). A workup that stops at the eye misses the underlying disease — every cat with uveitis needs systemic testing, not just eye drops.
Last reviewed: June 2026
What Uveitis Actually Is
Uveitis is inflammation of the uveal tract — the iris, ciliary body, and choroid — which together hold the eye's blood supply and pigment. Anterior uveitis affects the front of the eye and is the form owners usually notice. Cats with uveitis develop a red, dull, or hazy eye, often with a small (miotic) pupil, an iris that looks darker or muddier than usual, and visible cloudiness in the front chamber from inflammatory cells and protein (aqueous flare). The eye is painful, so the cat may squint, tear, hide, or stop eating.
Why Uveitis in Cats Is Different from Dogs
In dogs, uveitis is most commonly secondary to lens-induced inflammation, trauma, or breed-specific disease. In cats, the picture is flipped: infectious and neoplastic systemic disease drives the majority of cases. A landmark 2001 series of 134 cats with idiopathic-appearing uveitis found a specific systemic cause in roughly 50 percent when systematically tested, including FIP, toxoplasmosis, FeLV, FIV, bartonella, and lymphoma (Powell & Lappin, 2001, Vet Ophthalmology). The implication: treating only the eye misses the underlying disease, which is often what ultimately threatens the cat's life.
The Top Causes Worth Knowing
Toxoplasmosis is a parasite that infects cats and can cross from the gut to the eye and brain. Eye signs include uveitis, chorioretinitis, and sometimes retinal detachment. Diagnosis is by paired IgM/IgG titers and aqueous humor sampling in selected cases. Feline infectious peritonitis (FIP) is a coronavirus mutation that triggers immune-mediated inflammation; ocular FIP is one of the few forms that can present primarily as eye disease. FeLV and FIV both produce uveitis through immunosuppression and direct viral effects. Bartonella henselae has been documented as a cause of feline uveitis, though its role is debated. Lymphoma of the iris is the most common ocular neoplasm in cats and can look identical to inflammatory uveitis at first glance. Trauma and cataract-related lens-induced uveitis make up most of the remaining cases. The 2020 AAFP Feline Retrovirus Guidelines recommend FeLV/FIV testing in any cat with uveitis (AAFP Feline Retrovirus Management Guidelines, 2020).
What the Workup Looks Like
A complete blood count, chemistry, urinalysis, FeLV/FIV testing, toxoplasma IgM/IgG, and frequently bartonella serology make up the systemic infectious panel. Blood pressure should be measured because hypertension can cause retinal hemorrhage and look similar. Chest and abdominal imaging are added when lymphoma or FIP are suspected. The eye exam by a general practitioner or veterinary ophthalmologist documents IOP (low in active uveitis, high if secondary glaucoma has developed), aqueous flare, keratic precipitates (clumps of inflammatory cells on the inner cornea), and retinal involvement. As described in Nelson and Couto's Small Animal Internal Medicine, treating only the eye while ignoring a positive toxoplasma titer or new FeLV status sets the cat up for relapse and progression of the underlying disease.
Treatment Overview
Treatment has two halves. Local eye treatment includes topical anti-inflammatory drops (prednisolone acetate or diclofenac), and atropine to dilate the pupil and reduce iris-to-lens scarring. Pain control is critical. Systemic treatment depends on the underlying cause: clindamycin for toxoplasmosis, GS-441524 or remdesivir for FIP under specialist guidance, supportive care for retrovirus-associated uveitis, and chemotherapy or referral for ocular lymphoma. Untreated, anterior uveitis frequently leads to secondary glaucoma, cataract, retinal detachment, and blindness. Even with aggressive treatment, a chronically inflamed eye can lose vision.
When to See a Vet
Call your vet today if:
- One or both eyes look red, dull, or cloudy
- The pupil of one eye is small, irregular, or stuck in one position
- The iris looks darker, muddier, or differently colored than usual
- Your cat is squinting, tearing, or shy of bright light
- A cat with known FeLV, FIV, or FIP develops any new eye change
Go to the ER immediately if:
- The eye is bulging, very painful, and the cornea looks blue or cloudy (possible secondary glaucoma)
- Sudden vision loss in one or both eyes (bumping into things)
- Active bleeding inside the eye (hyphema — front chamber looks red)
- Profound lethargy, fever, or refusal to eat alongside eye changes (possible FIP or systemic infection)
- Head trauma followed by a painful, red eye
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Frequently Asked Questions
What is the most common cause of uveitis in cats?
Across published case series, idiopathic uveitis is the largest single category, but when cats are systematically tested for infectious disease, roughly half turn out to have a specific cause — most often toxoplasmosis, FIP, FeLV, FIV, bartonella, or ocular lymphoma. Trauma and lens-induced uveitis make up the rest. Every cat with uveitis should be tested rather than labeled idiopathic by default.
How much does cat uveitis workup and treatment cost?
Initial vet exam with tonometry and basic eye workup runs $80 to $250. A full infectious-disease panel (CBC, chemistry, FeLV/FIV, toxoplasma, bartonella) is typically $250 to $500. Veterinary ophthalmologist consultation adds $200 to $400. Topical eye medications run $30 to $80 per month. Targeted treatment for FIP, lymphoma, or toxoplasmosis ranges from a few hundred dollars per month to several thousand for advanced FIP protocols. Early diagnosis reduces the chance of permanent vision loss.
Is uveitis the same as conjunctivitis in cats?
No. Conjunctivitis is inflammation of the pink tissue around the eye and is usually superficial — most often herpesvirus or chlamydia. Uveitis is inflammation inside the eye, with the iris and front chamber involved, and a fundamentally different (and more serious) workup. The cornea typically looks clear with conjunctivitis but hazy with uveitis.
Can uveitis cause blindness in cats?
Yes. Chronic or severe uveitis can lead to secondary glaucoma, cataract, retinal detachment, and optic nerve damage. Outcome depends heavily on the underlying cause and how quickly anti-inflammatory and disease-specific treatment is started.
Do feline uveitis cats need an ophthalmologist?
Often, yes — especially for any cat that has a poor response to first-line topical anti-inflammatories within 7 to 14 days, has bilateral involvement, has signs of retinal disease, or has any suspicion of intraocular lymphoma. Ophthalmologists have access to aqueous tap, advanced retinal imaging, and definitive diagnostics that general practitioners typically do not.
Still Not Sure if Your Cat Needs a Vet?
When you're not sure if this is wait-and-see or call-tonight, Voyage AI Vet triages in under 2 minutes. Describe what you're seeing in chat, share photos of the eye in good light (close-up of the iris and pupil compared to the other eye), or hop on a live video call if you want a second pair of eyes. Every answer comes with citations to the actual veterinary literature it's pulling from — so you see exactly where the guidance comes from, not just a chatbot's word.