Merck Manual

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Kara C. LaMattina

, MD, Boston University School of Medicine

Reviewed/Revised Sep 2022
Topic Resources

Uveitis is inflammation anywhere in the pigmented inside lining of the eye, known as the uvea or uveal tract.

  • The uveal tract may become inflamed because of infection, injury, a bodywide autoimmune disorder (which causes the body to attack its own tissues), or for unknown reasons.

  • Symptoms may include eye ache, eye redness, floaters, loss of vision, or a combination.

  • Treatment typically includes corticosteroids (as eye drops, taken by mouth, or injected into or around the eye), drops that dilate and relax the pupil in the affected eye, and sometimes drugs that suppress the immune system.

The uveal tract consists of three structures:

  • The iris

  • The ciliary body

  • The choroid

The Cornea, Pupil, and Iris

The iris, the colored ring around the black pupil, opens and closes to let more or less light into the eye, just like the shutter in a camera.

The ciliary body is the set of muscles that, by contracting, allows the lens to become thicker so the eye can focus on nearby objects. By relaxing, the ciliary body allows the lens to become thinner so the eye can focus on distant objects. This process is called accommodation.

The choroid, which lines part of the back part of the eyeball, extends from the edge of the ciliary muscles to the optic nerve at the back of the eye. The choroid lies between the retina on the inside and the sclera on the outside. The choroid contains both pigmented cells and blood vessels that nourish the inside parts of the eye, particularly the retina.

A View of the Uveal Tract

The uveal tract consists of three structures: the iris, ciliary body, and choroid.

A View of the Uveal Tract

Part or all of the uveal tract may become inflamed. Inflammation limited to part of the uveal tract is named according to its location:

  • Anterior uveitis is inflammation in the front of the uveal tract, including the iris.

  • Intermediate uveitis is inflammation in the middle of the uveal tract, and typically also involves the jellylike substance that fills the eyeball (called the vitreous humor).

  • Posterior uveitis is inflammation in the back of the uveal tract and can involve the retina and choroid.

  • Panuveitis is inflammation that affects the entire uveal tract.

Sometimes uveitis is referred to by the name of the specific part that is inflamed. For example, iritis is inflammation of the iris, choroiditis is inflammation of the choroid, and chorioretinitis is inflammation that involves both the choroid and the overlying retina. Inflammation of the uveal tract is limited to one eye in many people with uveitis but may involve both eyes.

Causes of Uveitis

The inflammation has many possible causes. Some causes are limited to the eye itself, and others are disorders that affect the entire body. In most people, no cause is identified, and they are said to have idiopathic uveitis (or uveitis of unknown cause).

Many people with uveitis have a disorder that also affects organs elsewhere in the body. These include inflammatory diseases, such as Behçet syndrome Behçet Disease Behçet disease is chronic blood vessel inflammation (vasculitis) that can cause painful mouth and genital sores, skin lesions, and eye problems. The joints, nervous system, and digestive tract... read more Behçet Disease , ankylosing spondylitis Ankylosing Spondylitis Ankylosing spondylitis is a spondyloarthritis characterized by inflammation of the spine (spondylitis), large joints, and fingers and toes, resulting in stiffness and pain. Prolonged joint pain... read more Ankylosing Spondylitis , juvenile idiopathic arthritis Juvenile Idiopathic Arthritis (JIA) Juvenile idiopathic arthritis is a group of related childhood diseases that begin by age 16 and involve persistent or recurring inflammation of the joints. Certain forms of juvenile idiopathic... read more , sarcoidosis Sarcoidosis Sarcoidosis is a disease in which abnormal collections of inflammatory cells (granulomas) form in many organs of the body. Sarcoidosis usually develops in people aged 20 to 40 years, most often... read more Sarcoidosis , reactive arthritis Reactive Arthritis Reactive arthritis (previously called Reiter syndrome) is a spondyloarthritis causing inflammation of the joints and tendon attachments at the joints, often related to an infection. Joint pain... read more Reactive Arthritis , inflammatory bowel diseases Overview of Inflammatory Bowel Disease (IBD) In inflammatory bowel diseases, the intestine (bowel) becomes inflamed, often causing recurring abdominal pain and diarrhea. The 2 primary types of inflammatory bowel disease (IBD) are Crohn... read more (Crohn disease Crohn Disease Crohn disease is an inflammatory bowel disease where chronic inflammation typically involves the lower part of the small intestine, the large intestine, or both and may affect any part of the... read more Crohn Disease and ulcerative colitis Ulcerative Colitis Ulcerative colitis is a chronic inflammatory bowel disease in which the large intestine (colon) becomes inflamed and ulcerated (pitted or eroded), leading to flare-ups (bouts or attacks) of... read more ), tubulointerstitial nephritis and uveitis (TINU), and, among those of Asian, Asian Indian, American Indian, and Hispanic ancestry, Vogt-Koyanagi-Harada disease. Some people have widespread infections, such as tuberculosis Tuberculosis (TB) Tuberculosis is a chronic contagious infection caused by the airborne bacteria Mycobacterium tuberculosis. It usually affects the lungs, but almost any organ can be involved. Tuberculosis... read more Tuberculosis (TB) , syphilis Syphilis Syphilis is a sexually transmitted infection caused by the bacteria Treponema pallidum. It can occur in three stages of symptoms, separated by periods of apparent good health. Syphilis... read more Syphilis , or Lyme disease Lyme Disease Lyme disease is a tick-transmitted infection caused by Borrelia species, primarily by Borrelia burgdorferi and sometimes by Borrelia mayonii in the United States. These... read more Lyme Disease .

Although rare, some drugs (such as pamidronate, rifabutin, sulfonamide antibiotics, cidofovir, and checkpoint inhibitors like ipilimumab) can cause uveitis.

Symptoms of Uveitis

The early symptoms of uveitis may be mild or severe, depending on which part of the uveal tract is affected and the amount of inflammation.

Diagnosis of Uveitis

  • A doctor's evaluation

A doctor bases the diagnosis on the symptoms and a physical examination. During the examination, the doctor uses a slit lamp. A slit lamp Slit-Lamp Examination A person who has eye symptoms should be checked by a doctor. However, some eye disorders cause few or no symptoms in their early stages, so the eyes should be checked regularly (every 1 to 2... read more is an instrument that enables the doctor to examine the eye under high magnification. If the doctor suspects a disorder that also affects other organs, appropriate tests are done.

Treatment of Uveitis

  • Corticosteroids

  • Drugs to dilate the pupils

  • Sometimes other drugs or treatments

Uveitis treatment must start early to prevent permanent damage. Treatment almost always includes corticosteroids, usually given as eye drops. Corticosteroids can also be taken by mouth or injected into or around the eye. Drugs to dilate the pupils, such as homatropine or cyclopentolate drops, are also used.

Other drugs may be used to treat specific causes of uveitis. For example, if infection is the cause, drugs may be given to eliminate the infecting organism.

Occasionally, other treatments are necessary, such as surgery, use of a laser, or drugs taken by mouth or injected by vein (intravenously) or into the skin that suppress the immune system (immunosuppressants).

Drugs Mentioned In This Article

Generic Name Select Brand Names
AK-Pentolate , Cyclogyl, Cylate, Ocu-Pentolate
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