Uveitis is inflammation of the uvea, the middle layer of the eye that holds much of its blood supply. It happens when the immune system fights an infection or, more often in chronic cases, mistakenly attacks healthy eye tissue. It can hit one eye or both, and it can come on fast. Left untreated, the inflammation scars the eye and steals sight. Uveitis accounts for 10 to 15 percent of all blindness in developed countries, which puts it among the leading causes of vision loss in people of working age.
What uveitis does to the eye
The uvea sits between the white of the eye and the retina. Inflame it and the eye reacts: pain, light sensitivity, redness, and blurred or hazy vision. According to the National Eye Institute, symptoms usually start suddenly and include blurry vision, floaters, eye pain, red eyes, and sensitivity to light. Uveitis is grouped by where the inflammation sits: anterior (front of the eye), intermediate, posterior (back, near the retina), or panuveitis (throughout). The back-of-the-eye forms are the most threatening to sight because they reach the retina and the macula.
Vision is rarely lost in a single event. It is lost through cumulative damage from inflammation that recurs or never fully clears. The three complications that take sight are cystoid macular edema (fluid swelling the central retina), cataract, and glaucoma from raised eye pressure. More than a third of people with uveitis end up with some visual impairment. That is why the goal is not to calm one flare but to control the inflammation for good.
The sarcoidosis link is the Black-patient story
Sarcoidosis is an inflammatory disease that forms tiny clumps of immune cells, called granulomas, in organs throughout the body. It carries a notably high burden in Black Americans, with an incidence reaching about 17.8 per 100,000 per year, and the eye is one of its favorite targets. Ocular involvement shows up in roughly 10 to 50 percent of people with sarcoidosis, and uveitis is the most common form that involvement takes. When sarcoidosis reaches the eye, it can be the first sign anyone notices: uveitis is the presenting feature of sarcoidosis in 60 to 80 percent of cases where the eye is involved.
The pattern in Black patients is distinct and documented. In a study of biopsy-proven sarcoidosis, Black patients were younger when they first reached an ophthalmologist (mean age 44 versus 52), and a high proportion of Black men presented with uveitis. In a South Florida cohort, half of the sarcoidosis patients with eye involvement were Black, and uveitis made up the large majority of that ocular disease. The takeaway is concrete: for a Black adult, a new uveitis diagnosis is a reason to look for sarcoidosis, and a sarcoidosis diagnosis is a reason to get the eyes checked.
Sarcoidosis is not the only autoimmune driver. Uveitis travels with ankylosing spondylitis, inflammatory bowel disease (Crohn's and ulcerative colitis), psoriatic and reactive arthritis, lupus, multiple sclerosis, Behcet disease, and Vogt-Koyanagi-Harada disease. Infections cause it too, including syphilis, shingles, tuberculosis, and toxoplasmosis. That long list is the reason a uveitis diagnosis is never just an eye problem. If you carry one of these conditions, read our explainer on sarcoidosis in Black adults and tell your eye doctor about it.
Why delay costs sight
Uveitis damage is cumulative, so time matters. Every week of uncontrolled inflammation adds scar tissue, fluid, and pressure. Access gaps make that worse. A 2025 analysis of patients with non-infectious uveitis in the All of Us Research Program found that Black participants reported being treated with less courtesy in the health system at more than twice the rate of white participants. Cost and distance to a specialist push care later for many patients. Uveitis is also a subspecialty problem: getting to an ophthalmologist who manages it, and getting the systemic workup done, takes more steps than a routine vision check. Each delay is a chance for the eye to lose ground it does not get back.
This is not a reason to panic. It is a reason to treat eye symptoms as urgent and to be specific with the clinician you see. Say the words: eye pain, light sensitivity, floaters, redness. Ask directly whether you are being checked for uveitis and whether you need a referral to an ophthalmologist who handles eye inflammation.
How uveitis is diagnosed and treated
Diagnosis starts with a slit-lamp exam, where the doctor shines a focused light into the eye to see inflammatory cells floating in the fluid. A dilated exam checks the retina and optic nerve. Because uveitis so often signals a body-wide condition, the workup usually does not stop at the eye. Expect blood tests, a chest X-ray or CT to look for sarcoidosis, and screening for infections like syphilis and tuberculosis. Finding the cause changes the treatment, so the systemic workup is part of good care, not an extra.
Treatment aims to shut the inflammation down fast and keep it down. Anterior uveitis often responds to steroid eye drops plus a drop that dilates the pupil to ease pain and prevent the iris from sticking. Deeper or stubborn disease needs steroids by mouth, by injection around or into the eye, or steroid-sparing drugs (immunomodulators and biologics) when inflammation keeps returning. The point of the stronger drugs is to protect long-term vision while limiting the harms of long-term steroids. Uveitis tied to sarcoidosis or another autoimmune disease is managed alongside that condition, so your eye doctor and the rest of your care team work the same problem.
How to get care
If you have eye symptoms today, that is an urgent visit, not a wait-and-see. For ongoing care, you want an ophthalmologist, and for recurrent or back-of-the-eye disease, ideally one with a uveitis focus. If you have sarcoidosis, lupus, ankylosing spondylitis, or inflammatory bowel disease, ask for a baseline eye exam even when your eyes feel fine, because sarcoidosis can reach the eye quietly. You can find a Black ophthalmologist or eye specialist in our directory to start. Bring your full medical history to the first visit; the diagnosis often turns on what else is going on in your body.
Frequently asked questions
Is uveitis an emergency? ▼
Treat it like one. Eye pain, redness, light sensitivity, new floaters, or sudden blurred vision call for same-day eye care. Uveitis can cause permanent vision loss if it is not treated, and the damage builds the longer inflammation goes unchecked. Same-day care, not a wait, is the right move.
Can uveitis be a sign of sarcoidosis? ▼
Yes, and often the first sign. The eye is one of the most common places sarcoidosis shows up, and in cases with eye involvement, uveitis is the presenting feature 60 to 80 percent of the time. Because sarcoidosis carries a heavy burden in Black communities, a new uveitis diagnosis in a Black adult is a strong reason to be screened for it, usually with blood tests and a chest X-ray or CT.
Does uveitis cause blindness? ▼
It can, and it is one of the leading causes of preventable vision loss, responsible for 10 to 15 percent of blindness in developed countries. Sight is usually lost through cumulative damage: swelling of the central retina (macular edema), cataract, and glaucoma from raised eye pressure. Catching and controlling the inflammation early is what protects vision.
What is the treatment for uveitis? ▼
It depends on where and how severe the inflammation is. Front-of-the-eye uveitis often responds to steroid eye drops and a pupil-dilating drop. Deeper or recurrent disease may need oral or injected steroids, or steroid-sparing drugs such as immunomodulators and biologics. When uveitis is driven by sarcoidosis or another autoimmune disease, treating that underlying condition is part of the plan.
Should I see an eye doctor if I have sarcoidosis but my eyes feel fine? ▼
Yes. Sarcoidosis can affect the eye without obvious early symptoms, so a baseline eye exam after diagnosis is worth it, with follow-up as your specialist advises. The same applies if you have lupus, ankylosing spondylitis, or inflammatory bowel disease. Ask for a dilated exam and tell the eye doctor about your diagnosis.