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| '''Uveitis''' specifically refers to [[inflammation]] of the middle layer of the [[eye]], termed the "[[uvea]]" but in common usage may refer to any inflammatory process involving the interior of the eye.
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| Uveitis is estimated to be responsible for approximately 10% of the blindness in the United States.
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| Uveitis requires an urgent referral and thorough examination by an [[ophthalmologist]], along with urgent treatment to control the inflammation.
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| ==Types==
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| Uveitis is usually categorized anatomically into ''anterior'', ''intermediate'', ''posterior'' and ''panuveitic'' forms.
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| * Anywhere from two-thirds to 90% of uveitis cases are anterior in location (anterior uveitis), frequently termed ''[[iritis]]'' - or inflammation of the [[Iris (anatomy)|iris]] and [[anterior chamber]]. This condition can occur as a single episode and subside with proper treatment or may take on a recurrent or chronic nature. Symptoms include [[red eye (medicine)|red eye]], injected [[conjunctiva]], pain and decreased vision. Signs include dilated ciliary vessels, presence of cells and flare in the anterior chamber, and keratic precipitates ("KP") on the posterior surface of the [[cornea]].
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| * [[Intermediate uveitis]] consists of vitritis - inflammatory cells in the [[vitreous humour|vitreous cavity]], sometimes with ''snowbanking'', or deposition of inflammatory material on the [[pars plana]].
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| * Posterior uveitis is the inflammation of the [[retina]] and [[choroid]].
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| * Pan-uveitis is the inflammation of all the layers of the uvea.
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| ==Causes==
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| A myriad of conditions can lead to the development of uveitis, including systemic diseases as well as syndromes confined to the eye. In anterior uveitis, no specific diagnosis is made in approximately one-half of cases. However, anterior uveitis is often one of the syndromes associated with [[HLA-B27]].
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| ===Systemic disorders causing uveitis===
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| Systemic disorders that can cause uveitis include: White G. [http://www.allaboutvision.com/conditions/uveitis.htm "Uveitis."] AllAboutVision.com. Retrieved August 20, 2006.</ref>
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| *[[Acute posterior multifocal placoid pigment epitheliopathy]]
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| *[[Ankylosing spondylitis]]
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| *[[Behçet's disease]]
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| *[[Birdshot retinochoroidopathy]]
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| *[[Brucellosis]]
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| *[[Herpes simplex]]
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| *[[Herpes zoster]]
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| *[[Inflammatory bowel disease]]
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| *[[Juvenile rheumatoid arthritis]]
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| *[[Kawasaki disease]]
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| *[[Leptospirosis]]
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| *[[Lyme disease]]
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| *[[Multiple sclerosis]]
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| *[[Presumed ocular histoplasmosis syndrome]]
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| *[[Psoriatic arthritis]]
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| *[[Reiter's syndrome]]
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| *[[Sarcoidosis]]
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| *[[Syphilis]]
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| *[[Systemic lupus erythematosus]]
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| *[[Toxocariasis]]
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| *[[Toxoplasmosis]]
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| *[[Tuberculosis]]
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| *[[Vogt-Koyanagi-Harada syndrome]]
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| *[[Whipple disease]]
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| ===Masquerade syndromes===
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| Masquerade syndromes are ophthalmic disorders that clinically present as either an anterior or posterior uveitis, but are not primarily inflammatory. The following are some of the most common:
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| *Anterior segment
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| :*Intraocular [[foreign body]]
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| :*[[Juvenile xanthogranuloma]]
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| :*[[Leukemia]]
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| :*Malignant melanoma
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| :*[[Retinoblastoma]]
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| :*[[Retinal detachment]]
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| *Posterior segment
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| :*Lymphoma
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| :*Malignant melanoma
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| :*Multiple sclerosis
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| :*Reticulum cell sarcoma
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| :*Retinitis pigmentosa
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| :*Retinoblastoma
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| ==Symptoms==
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| * Redness of the eye
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| * Blurred vision
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| * Sensitivity to light (photophobia)
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| * Dark, floating spots along the visual field
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| * Eye pain
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| ==Treatment==
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| The prognosis is generally good for those who receive prompt diagnosis and treatment, but serious complication (including [[cataracts]], [[glaucoma]], [[band keratopathy]], retinal edema and permanent vision loss) may result if left untreated. The type of uveitis, as well as its severity, duration, and responsiveness to treatment or any associated illnesses, all factor in to the outlook.[http://www.intelihealth.com/IH/ihtIH/EMIHC000/9339/10942.html]
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| Uveitis is typically treated with [[glucocorticoid]] [[steroid]]s, either as topical eye drops (such as [[betamethasone]], [[dexamethasone]] or [[prednisolone]]) or oral therapy with [[prednisolone]] tablets. In addition topical [[cycloplegic]]s, such as [[atropine]] or [[homatropine]], may be used.
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| In some cases an injection of PSTTA can also be given to reduce the swelling of the eye.
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| <!--
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| --><ref>[[British National Formulary|BNF]] '''45''' March 2003</ref>
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| [[Antimetabolite]] medications, such as [[methotrexate]] are often used for recalcitrant or more aggressive cases of uveitis. Experimental treatment with [[Infliximab]] infusions may prove helpful.
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| ==See also== | | ==See also== |
