Year : 2010 | Volume
: 58 | Issue : 1 | Page : 21--27
B Manohar Babu1, SR Rathinam2,
1 Uvea Clinic, Aravind Eye Hospital, Coimbatore, India
2 Aravind Eye Hospital, Madurai, India
B Manohar Babu
Aravind Eye Hospital, Avinashi Road, Coimbatore - 641 014
Intermediate uveitis (IU) is described as inflammation in the anterior vitreous, ciliary body and the peripheral retina. In the Standardization of Uveitis Nomenclature (SUN) working group«SQ»s international workshop for reporting clinical data the consensus reached was that the term IU should be used for that subset of uveitis where the vitreous is the major site of the inflammation and if there is an associated infection (for example, Lyme disease) or systemic disease (for example, sarcoidosis). The diagnostic term pars planitis should be used only for that subset of IU where there is snow bank or snowball formation occurring in the absence of an associated infection or systemic disease (that is, «DQ»idiopathic«DQ»). This article discusses the clinical features, etiology, pathogenesis, investigations and treatment of IU.
|How to cite this article:|
Babu B M, Rathinam S R. Intermediate uveitis.Indian J Ophthalmol 2010;58:21-27
|How to cite this URL:|
Babu B M, Rathinam S R. Intermediate uveitis. Indian J Ophthalmol [serial online] 2010 [cited 2020 Apr 9 ];58:21-27
Available from: http://www.ijo.in/text.asp?2010/58/1/21/58469
Uveitis or intraocular inflammation has many subtypes and many potential associations with systemic conditions and has always been one of the most challenging diagnoses in ophthalmology. Classification of uveitis into subtypes helps immensely in diagnosis, treatment and prognosis of a patient's condition. This article outlines epidemiology, clinical features, complications, etiopathogenesis, pathology, differential diagnosis, investigations and treatment. A Medline search was conducted for relevant articles published in English. Articles were analyzed for content and evidence level.
Intermediate uveitis (IU), pars planitis, chronic cyclitis, peripheral uveitis, vitritis, cyclochorioretinitis, chronic posterior cyclitis and peripheral uveoretinitis are the nam es that have been used to describe inflammation in the anterior vitreous, ciliary body and the peripheral retina. 
The IUSG (International Uveitis Study Group) suggested the term IU to denote an idiopathic inflammatory syndrome, mainly involving the anterior vitreous, peripheral retina and the ciliary body with minimal or no anterior segment or chorioretinal signs. 
More recently during the Standardization of Uveitis Nomenclature (SUN) working group's international workshop for reporting clinical data the consensus reached was that the term IU should be used for that subset of uveitis where the vitreous is the major site of the inflammation, and that the presence of peripheral vascular sheathing and macular edema should not change the classification. The diagnostic term pars planitis should be used only for that subset of IU where there is snow bank or snowball formation occurring in the absence of an associated infection or systemic disease (that is, "idiopathic"). If there is an associated infection (for example, Lyme disease) or systemic disease (for example, sarcoidosis), then the term IU should be used. 
In the Western literature IU has been reported in 1.4-22% of uveitis patients. ,,,, In India the percentage of IU varies from 9.5-17.4%. ,, The prevalence is estimated to be 5.9/100,000 and incidence 1.4/100,000.  In a South India-based study the prevalence of active IU was 0.25%.  Though the disease affects patients in all age groups, it is predominantly seen in the third and fourth decade. ,, Bilaterality is seen in 70-90% in the Western literature , and is 37.6% in a South India-based study.  No definite gender predilection is seen.
IU is not hereditary though it has been observed in families. Human leucocyte antigen (HLA) studies have shown common HLA haplotypes in a few families. ,,,, It has been shown that patients who are HLA-DR15-positive and have IU may have systemic findings of another HLA-DR15-related disorder- multiple sclerosis, optic neuritis, and narcolepsy. 
IU accounts for 10-12% of all uveitis seen in children. 
Patients with IU present with minimal symptoms, floaters or blurred vision. In severe cases they can present with visual loss due to aggregation of floaters in the vitreous or due to macular edema. The anterior chamber may be quiet or may have signs of inflammation in the form of keratic precipitates (KP's) or flare and cells, which are usually minimal. Posterior synechiae may or may not be seen, if present, are seen usually involving the inferior iris. Vitritis is a characteristic feature of IU, and it is typically described as vitreous haze ranging from trace to 4+. 
Vitreous snowballs [Figure 1] typically are yellow-white inflammatory aggregates, and are found in the midvitreous and inferior periphery. Snowbanks are exudates on the pars plana, when present are usually found inferiorly, but may also extend 360 degrees of the retinal periphery. Snowbanking is usually associated with the more severe form of the disease, and warrants aggressive therapy. Retinal changes in IU include tortuosity in arterioles and venules, sheathing of peripheral veins, neovascularizations and retinal detachments. ,,
IU is most often a benign form of uveitis. Its complications are due to its chronicity, and if left untreated can lead to blindness. The incidence of glaucoma in acute uveitis is 7.6% and in patients with chronic uveitis the incidence of glaucoma at one and five years is 6.5% and 11.1% respectively. There was no statistically significant difference between anterior, intermediate, posterior and panuveitis entities and the presence of glaucoma was associated with an increased risk of visual loss.  Active inflammation, steroid usage, increasing age, and number of years since diagnosis are significantly correlated with raised intraocular pressure (IOP). 
Cataracts occur in 15-50% of eyes. Typically they are located posterior or anterior subcapsularly, or both, or posterior cortically. Posterior polar cataracts have been reported as well. The incidence of cataracts increases with the duration and severity of the disease. If treated earlier with immunosuppressives rather than corticosteroids cataract formation is less severe. ,,
Macular edema and maculopathy are the most common causes of visual loss [Figure 2]. Incidence varies from 12 to 51%. Like cataract their incidence increases with the duration and severity of the disease. ,, Epiretinal membranes occurred in 34.6-36% eyes, which was not related to duration of disease or chronic cystoid macular edema (CME). ,
Retinal vasculitis in the form of periphlebitis is found in 16-36%. ,, It may induce neovascularization and cyclitic membrane formation.  Retinal detachments (RD) occurred in 2.2-51% eyes. ,,,, Exudative RD has been seen secondary to inflammation in IU.  But the most common forms to be seen are vitreous traction secondary to longstanding vitreous inflammation and subsequent peripheral hole formation. 
Peripheral neovascularization with and without vitreous hemorrhage was seen in 6.5% by Malinowski et al. Optic nerve involvement in the form of disc edema is seen in 3-38.6% of eyes with IU. ,, Optic neuritis with or without multiple sclerosis was seen in 7.4% of eyes with pars planitis. 
IU may be initiated by an unknown antigen, leading to a clinical picture of vasculitis and vitreous cells. It is possible that the antigen may be infectious because IU is seen in infectious diseases like Lyme's, syphilis and cat-scratch fever. The disease may be autoimmune - as IU is also seen in non-infectious disorders like multiple sclerosis and sarcoidosis.  Type II collagen in the vitreous may be an autoantigen in some patients. 
IU seems to be a T-cell-mediated disease, as it can be reproduced in experimental models using retinal S antigen/ interphotoreceptor retinoid binding protein (IRBP)/ hyaluronic acid, and the disorder responds well to immunosuppression. Lymphocytic infiltration of the retinal venules leads to the clinical picture of vasculitis. Major histocompatibility complex (MHC) Class II antigen expression was found on the vascular endothelium, which could be a part of the initiating process in the recruitment of activated T-cells to stimulate a local vasculitis, leading to vitreous inflammation. 
T-cells are the predominant cell type in the vitreous in IU- up to 95% of all cells, of which CD4+ cells are 35-90%. , Macrophages are the second most important cells seen. In active inflammation epitheloid cells and multinucleated giant cells are seen.  A 36 kDa protein (p-36) is found in elevated concentrations in the blood of many patients with active pars planitis. The levels of this protein correlated with disease activity. Its role in the etiopathogenesis of pars planitis is unknown.  HLA associations include HLA-DR, B8, and B51, the most significant being HLA-DR which occurs in 67-72% of patients. In a small study of 18 patients with IU, 72% were HLA-DR 15 positive and of these 32% had IU. , HLA association identifies individuals at risk and is not a diagnostic marker.
Histological studies of the peripheral retina and ciliary body demonstrate condensed vitreous, fibroblasts, spindle cells, lymphocytes and blood vessels and prominent lymphocyte cuffing of retinal veins.  Pars plana exudates appear to consist of loose fibrovascular layer containing scattered mononuclear inflammatory cells and a few fibrocyte-like cells adjacent to the hyperplastic nonpigmented epithelium of the pars plana. This fibroglial tissue consists of vitreous collagen, Muller cells and probable fibrous astrocytes. 
IU has been associated with infectious conditions like Lyme's disease (Borrelia burgdorferi), toxoplasmosis, toxocariasis, tuberculosis, syphilis, human lymphotropic virus Type 1 (HTLV-1), Epstein-Barr virus and cat-scratch disease (Bartonella henselae, B quintana). It is also associated with noninfectious entities like multiple sclerosis, sarcoidosis and intraocular lymphoma.
Multiple sclerosis: About 3-27% of patients with multiple sclerosis (MS) develop IU/pars planitis, , and 7.8-14.8% of patients with IU/pars planitis develop MS. , IU characterized by pars plana snowbanks, retinal periphlebitis (in 5-20%) and panuveitis are the commonest manifestations of MS and up to 95% are bilateral.
Sarcoidosis: About 23-26% of patients with sarcoidosis develop IU, , and 2-10% of patients with IU develop sarcoid disease. , The typical ocular findings, CME, optic disc swelling, periphlebitis, and retrobulbar optic neuritis were seen in patients with IU, both with or without sarcoidosis.  It is commonly bilateral, and presents as IU and granulomatous anterior uveitis. 
Intraocular lymphoma: Two-thirds of intraocular lymphomas are a manifestation of a primary central nervous system lymphoma (PCNSL) arising outside the lymphatic system and are localized in the brain, the meninges or the spinal cord. In 10-20% the disease commences as vitreous or retinal infiltrates mimicking uveitis and 95% of PCNSL are non-Hodgkins B-cell lymphomas. Mean age at presentation was 63.5 years with a female to male ratio of 6 to 4.  The diagnostic procedures are vitreous biopsy, neurologic history, cerebrospinal fluid (CSF) studies, brain magnetic resonance imaging (MRI ).
Syphilis: In the eye, uveitis is the commonest presentation of syphilis. In a case series of Fluorescent Treponemal Antibody Absorption (FTA-ABS)-positive syphilis patients with uveitis, though anterior uveitis, nongranulomatous (in 62%), was the commonest presentation seen, IU was observed in 10.3%.  Anterior uveitis, both granulomatous and nongranulomatous, posterior uveitis, panuveitis, vitritis, vasculitis, retinitis, placoid choroiretinitis and optic nerve involvement are also seen in eyes with syphilitic uveitis. History, systemic and ocular examination and serologic testing with venereal disease research laboratory (VDRL) and FTA-ABS tests, should exclude the diagnosis of syphilis. , IU has been described to occur in Lyme's disease caused by another spirocheate- Borrelia burgdorferi, both in adults and in children. ,
Tuberculosis: Infection with Mycobacterium Tuberculosis can induce a similar picture of IU . A thorough history, systemic and ocular examination, chest X-ray, and skin testing are necessary. Finding of granulomatous iris nodules and/or choroidal granulomas should alert us to suspect tubercular etiology. 
Others: IU has been reported in children with renal diseases, tubulointerstitial nephritis and uveitis syndrome (TINU syndrome), and mesangial glomerulonephritis. , IU has also been reported to occur in antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis,  and in post-streptococcal uveitis.  A case of autoimmune lymphoproliferative syndrome (ALPS) presenting with bilateral uveitis was seen and control of the IU required sustained doses of topical and periocular corticosteroids as well as systemic cyclosporine.  IU is also a rare manifestation of Behηet's disease and AIDS, and chronic propionibacterial endophthalmitis.  Uveitis occurs in 14.5% of patients with (HTLV-I) disease, and manifests as IU in 78.6%. ,
Uveitic entities like peripheral toxoplasmosis, toxocariasis, endogenous endophthalmitis, acute retinal necrosis (ARN), retinal vasculitis associated with Eale's disease, Fuch's heterochromic cyclitis with vitreous haze and Vogt-Koyanagi-Harada disease with vitritis and retinal detachments must be ruled out before starting therapy.
The diagnosis of IU is based on clinical findings. Patient's complaints of defective vision and/or floaters in the absence of pain, redness, photophobia should alert the ophthalmologist. Presence of vitreous cells that outnumber anterior chamber cell infiltration, vitreous snowballs, and the presence of pars plana exudation, suggest IU. Laboratory and ancillary tests are not necessary to establish the diagnosis; however, with a careful history, ocular and systemic examination together with laboratory studies, we may be able to exclude an associated disorder.
The patient's history should concentrate on the duration of symptoms, the number of recurrences, and findings that might be associated with systemic disorders. Fever, fatigue, or night sweats are typical signs of sarcoidosis and tuberculosis, whereas loss of sensitivity or paresthesias of the hands, arms, or legs are suggestive of possible MS. Signs of dermatitis may point to Lyme disease, tuberculosis, or syphilis, whereas arthritis of the knee may suggest the possibility of Lyme's, disease, and contact with cats may raise the possibility of Bartonella infection. 
A routine baseline workup comprising complete blood count which includes total and differential count/ hemoglobin/ platelet count, erythrocyte sedimentation rate, purified protein derivative skin test (PPD) and chest X-ray are mandatory. Total count is increased in -infections, chronic inflammation and autoimmune disease. Infections predominantly cause an increase in neutrophils, and lymphocytosis may indicate a possible tuberculosis etiology. Chest X-ray studies may disclose findings indicative of sarcoidosis or tuberculosis.
A PPD test is needed to exclude tuberculosis/sarcoidosis.
In cases of IU, only a few laboratory and serologic tests are necessary. These tests include determination of the angiotensin-converting enzyme (ACE) level. Serologic testing for cat-scratch disease, syphilis, and Lyme's: disease should be seriously considered in cases of IU.
Subclinical pulmonary sarcoidosis, undetectable by chest X-ray study, may be detected via computed tomography (CT) of the chest or by gallium scan, or both. A combination of serum ACE level and whole-body gallium scan increases the diagnostic specificity without affecting sensitivity in patients with clinically suspicious ocular sarcoidosis who have normal or equivocal chest radiographs. Fluorescein angiography (FA) alerts one to the presence of vasculitis, areas of retinal nonperfusion and neovascularization and CME. It is useful in following up a patient as well.
Using ultrasound biomicroscopy (UBM), it is possible to demonstrate pars plana exudates, and even inflammatory cell aggregates in the vitreous. Ultrasonography (USG) can be done to rule out RD, intraocular tumors.
Diagnostic vitrectomy is done in cases when tumors are suspected, in patients with severe vitreous inflammation where retinitis, endophthalmitis cannot definitely be excluded and in cases where response to medical therapy is refractory. 
Intermediate uveitis in children: Uveitic entities with an etiologic diagnosis seen in the pediatric age group are: juvenile idiopathic arthritis (30%), toxoplasmosis (3.3%), HLA-B27-associated iritis (1.89%), acute retinal necrosis (1.1%), tubulointerstitial nephritis associated anterior uveitis (1.1%), Kawasaki-related anterior uveitis (0.7%), and Vogt-Koyanagi-Harada syndrome (1.1%), isolated cases of sarcoid uveitis, multifocal choroiditis and panuveitis, Behηet's disease, Herpes simplex virus keratouveitis, masquerade syndrome, late-onset retinoblastoma, systemic lupus erythematosus, sympathetic ophthalmia, toxocariasis, Varicella-zoster virus iritis, and infectious endophthalmitis.
IU accounts for 1.8-29% of uveitis seen in the pediatric age group. All cases were reported to be idiopathic IU in three studies reported from various parts of the world. ,,, This is in contrast to a report from south India. Idiopathic uveitis in children accounted for only 25.5% of cases, whereas infectious uveitis was found in 58%.  Mean age of onset of uveitis is 8.5-10.9 years. There is a male preponderance. Bilateral involvement is seen in 84-94% patients. Chronicity of uveitis is 84-100%. Mean time to remission is 6.4 years. Common complications seen are: disc edema, CME, cataract, glaucoma, and band-shaped keratopathy. Epiretinal and neovascular membranes occur. Snowbanking is seen in 28% of patients. ,
Since the etiology of IU remains elusive in most cases, the therapy is mainly symptomatic. The presence of CME is an indication for treatment with periocular corticosteroid injections with or without a short-term course of systemic corticosteroids. Boer et al. conclude that IU in children might resolve after several years and, despite a high ocular complication rate, severe visual loss is uncommon. 
Treatment is directed at the cause, if detected. Malignancies need to be ruled out. Treatment discussed here is nonspecific anti-inflammatory therapy for IU. Indications for treatment are decrease in visual acuity to  and retinal vasculitis.
Kaplan first advocated a four-step treatment of IU in 1984.  A discussion of various treatment modalities follows:
Corticosteroids: Corticosteroids are indicated when the visual acuity drops due to vitritis, CME or progression of neovascularization at the vitreous base. Periocular corticosteroids are the first line of management. Local injection of depot preparation of either a long-acting methylprednisolone (40 mg) or triamcinolone acetonide (20 mg) is given either through the posterior sub-tenon route or retroseptally through the lower lid, and can be spaced -two to four weeks apart. Complications of periocular injections are increased IOP, cataract, aponeurotic ptosis and allergic reactions with conjunctival breakdown. Repeated injections may cause enophthalmos and orbital scarring. Improvement in at least two Snellen lines was seen in 12/18 patients at a median of three weeks. 
If local therapy is not effective or bilateral severe disease is seen at presentation oral corticosteroids are indicated. Oral prednisolone is started at 1 mg/kg/day with gradual tapering after two weeks and guided thereafter by the clinical response. Ideally, the disease should be controlled with 5 mg or less daily. Eyes treated with oral and periocular steroids improved vision-wise  and angiography-wise. 
Intravitreal triamcinolone (IVTA) may be an alternative to periocular injections in refractory cases though they carry the risk of RD, vitreous hemorrhage, IOP elevation and endophthalmitis. IVTA was associated with an improvement in vision of more than two lines in 50% of the eyes within 12 weeks after injection, as reported by Hogewind et al., where 33 eyes were treated with IVTA for uveitic CME that was refractory to topical steroids, oral prednisone, or a combination. Cataract and glaucoma were the common side-effects. 
Immunomodulatory therapy may be considered at this point if corticosteroids fail. Methotrexate, azathioprin, cyclosporine, mycophenolate mofetil, tacrolimus have been used in treating IU. Cyclophosphamide and chlorambucil have been used in refractory uveitis. Newer biologic agents are being used as well.
Antimetabolites/antiproliferative drugs: Methotrexate (MTX), a folate analog which inhibits dihydrofolate reductase, is used at a dose of 7.5-25 mg per week oral/subcutaneous. Though its potential side-effects are gastro intestinal (GI) upset, fatigue, hepatotoxicity and pneumonitis, it is effective and safe for chronic anterior and IU in children. 
Azathioprine, a purine nucleoside analog, alters purine metabolism. It is used at a dose of 50-150 mg per day in divided doses orally. Its potential side-effects are GI upset and hepatotoxicity.
Mycophenolate mofetil (MMF) acts by inhibiting purine synthesis, prevents replication of T and B lymphocytes by selectively inhibiting inosine-5-monophosphate dehydrogenase. It is used at a dose of 1-3 mg per day in divided doses orally. Diarrhea, nausea, and GI ulceration are its potential side-effects. The rate of MMF discontinuation because of side-effects was low, GI disturbance was the commonest side-effect seen.  It has been found to be safe in children when used alongside oral corticosteroid.  Galor et al. compared all the three antimetabolites in a cohort of patients with ocular inflammation which included patients with IU in all three groups, and concluded that time to control of ocular inflammation is faster with mycophenolate than with methotrexate. 
Inhibitors of T-cell signaling
Cyclosporine (CsA): Inhibits NF-AT (nuclear factor of activated T-cells) activation, and is used at a dosage of 2.5-5.0 mg per kg per day in divided doses orally. Known toxic effects are nephrotoxicity, hypertension, gingival hyperplasia, GI upset and paresthesias. At the National Institute of Health (NIH) cyclosporine is the first-line steroid-sparing agent in IU. 
Tacrolimus: Inhibits NF-AT activation, and is used at a dose of 0.1-0.2 mg per kg per day orally. Nephrotoxicity, hypertension and diabetes mellitus are its known potential complications. Tacrolimus's efficacy for the treatment of uveitis is maintained long-term, and its cardiovascular risk profile is excellent. 
Biologic response modifiers: Newer anti-inflammatory drugs like daclizumab, infliximab, eternercept, interferon alpha are being increasingly used as first-line, second-line drugs in the management of refractory uveitis.
Daclizumab: humanized monoclonal anti-IL-2 receptor alpha antibody. It binds to the alpha subunit of IL-2 receptor thereby suppressing autoreactive T-cells. It is used at a dose of 1.0 mg per kg IV every two weeks for five doses. High-dose daclizumab can reduce inflammation in active uveitis and is well tolerated but there may be a potential increased risk of infection associated with immunosuppression. 
Cryotherapy and laser photocoagulation: If drug therapy has failed or recurrent inflammation is seen despite corticosteroid use, cryotherapy or laser photocoagulation may be used to control the disease.  Cryotherapy before immunomodulatory therapy is also the preferred practice as described in Western literature.  Peripheral ablation of the pars plana snowbank with cryotherapy or indirect laser photocoagulation to the peripheral retina can be done. Cryotherapy is performed by applying a double row, single freeze of transconjunctival cryopexy to the pars plana and posterior to it, extending to an area 1 o'clock-h beyond all evidence of disease activity. Photocoagulation burns may be placed confluently in three or four rows just posterior to the snowbank. The rationale for these procedures is to treat the neovascularization associated with pars plana exudation and vitritis and to destroy the vascular component of the peripheral retinitis or vitritis, thus eliminating the entrance site for inflammatory mediators into the eye. , Cryotherapy decreases vitritis and improves visual acuity.  It has also been shown to decrease fluorescein leakage in these areas. Laser photocoagulation seems to be as effective as cryotherapy in treating inflammation and peripheral neovascularization.  Cryotherapy is not universally used due to reported increased incidence of post-treatment RD. It can, however, be considered in patients who have neovascularization of vitreous base and a history of vitreous hemorrhage.
Vitrectomy: Decreased inflammatory disease has been reported after pars plans vitrectomy (PPV) for chronic inflammation in patients with IU. PPV is an important means of correcting structural complications of uveitis, helps in decreasing inflammation in the anterior chamber and in the vitreous and in reduction of anti-inflammatory medication postoperatively. It helps in improving visual outcome and is beneficial in reducing CME. 
Cataract: Cataracts are a frequent complication that result from both, chronic inflammation and corticosteroid therapy. Phacoemusification and intraocular lens (IOL) implantation is safe in IU/pars planitis.  Visual acuity of 20/40 or better was seen in 88% of patients following cataract surgery and IOL implantation in whom control of inflammation for three months preoperatively was achieved.  Control of inflammation can be achieved with use of corticosteroids- topical, periocular, oral with or without immunosuppressive therapy. 
Our suggested algorithm for treatment of IU is as follows:
Step 1: Periocular steroids administered by local injection of depot corticosteroids may be repeated every four weeks until three to four injections have been administered. Generally, the inflammation responds and the CME improves. IVTA may be an alternative to periocular injections in refractory cases.th
Step 2: If local therapy is not effective or bilateral severe disease is seen at presentation oral corticosteroids are indicated.
Step 3: Systemic immunomodulatory therapy is indicated in the treatment of bilateral disease, and can be considered if corticosteroids fail, are not tolerated or are contraindicated.
Step 4: If corticosteroids fail, or if corticosteroids and immunomodulatory therapy are contraindicated, and if pars plana snowbanks are present, peripheral ablation with cryotherapy or indirect laser photocoagulation to the peripheral retina can be done.
Step 5: If all the treatment modalities fail to control inflammation, PPV with induction of posterior hyaloidal separation and peripheral laser photocoagulation to pars plana snowbank may be performed, along with immunomodulatory therapy.
|1||Vitale AT, Zierhut M, Foster CS. Intermediate Uveitis. In: Foster CS, Vitale AT, editors. Diagnosis and treatment of uveitis. Philadelphia: W.B.Saunders and Company; 2002. p. 844-57.|
|2||Bloch-Michel E, Nussenblatt RB. International Uveitis Study Group recommendations for the evaluation of intraocular inflammatory disease. Am J Ophthalmol 1987;103:234-5.|
|3||Jabs DA, Nusenblatt RB, Rosenbaum JT. Standardization of Uveitis nomenclature (SUN) working group. Standardization of uveitis nomenclature for reporting clinical data. Results of the First International Workshop. Am J Ophthalmol 2005;140:509-16.|
|4||McCannel CA, Holland GN, Helm CJ, Winston JV, Rimmer TG. Causes of uveitis in the general practice of ophthalmology. UCLA Community based Uveitis Study Group. Am J Ophthalmology 1996;121:35-46.|
|5||Chan SM, Hudson M, Weis E. Anterior and intermediate cases referred to a tertiary care center in Alberta. Can J Ophthalmol 2007;42:860-4. |
|6||Henderly DE, Genstler AJ, Smith RE, Rao NA. Changing patterns of uveitis. Am J Ophthalmol 1987;103:131-6.|
|7||Rodriguez A, Calonge M, Pedroza-Seres M, Akova YA, Messmer EM, D'Amico DJ, et al. Referral patterns of uveitis in a tertiary eye care centre. Arch Ophthalmol 1996;114:593-9.|
|8||Singh R, Gupta V, Gupta A. Pattern of uveitis in a referral clinic in North India. Indian J Ophthalmol 2004;52:121-5.|
|9||Biswas J, Narain S, Das D, Ganesh SK. Patterns of uveitis in a referral unit in India. Int Ophthalmol 1996-1997;20:223-8.|
|10||SR Rathinam, Namperumalsamy P. Global variation and pattern changes in epidemiology of uveitis. Indian J Ophthalmol 2007;55:173-83.|
|11||11 Vadot E. Epidemiology of IU- A prospective study in Savoy. Dev Ophthalmol 1992;23:33-4.|
|12||Dandona L, Dandona R, John RK, McCarty CA, Rao GN. Population based assessment of uveitis in an urban population in Southern India. Br J Ophthalmol 2000;84:706-9. |
|13||Thorne JE, Daniel A, Jabs DA, Kedhar SR, Peters GB, Dunn JP. Smoking as a risk factor for cystoid macular edema complicating intermediate uveitis. Am J Ophthalmol 2008;145:841-6.|
|14||Biswas J, Raghavendran SR, Vijaya R. Intermediate uveitis of pars planitis type in identical twins. Report of a case. Int Ophthalmol 1998;22:275-7. |
|15||Fitt A, Harrison RJ. Familial intermediate uveitis: a case report of two brothers. Eye 1999;13:808-9.|
|16||Lee AG. Familial pars planitis. Ophthalmic Genet 1995;16:17-9. |
|17||Tejada P, Sanz A, Criado D. Pars planitis in a family. Int Ophthalmol 1994;18:111-3.|
|18||Browning AC, Calladine D, Collins N, Harmer AW, Amoaku WM. HLA typing of a Hong Kong Chinese family with intermediate uveitis. Br J Ophthalmol 2006;90:657. |
|19||Tang WM, Pulido JS, Eckels DD, Han DP, Mieler WF, Pierce K. The association of HLA-DR15 and intermediate uveitis. Am J Ophthalmol 1997;123:70-5.|
|20||Engelmann K, Ness T, Greiner K, Hudde T. Uveitis intermedia in childhood. Klin Monatsbl Augenheilkd 2007;224:462-8.|
|21||Nusenblatt RB, Palestine AG. Intermediate uveitis. In: Uveitis: Fundamentals and clinical practice. Chicago: Yearbook Medical; 1989. p. 279-88.|
|22||Felder KS, Brockhurst RJ. Neovascular fundus abnormalities and peripheral uveitis. Arch Ophthalmol 1982;100:750-4.|
|23||Pruett RC, Brockhurst J, Letts NF. Fluorescein angiography of peripheral uveitis. Am J Ophthalmol 1974;77:448-53.|
|24||Neri P, Azuara-Blanco A, Forrester JV. Incidence of glaucoma in patients with uveitis. J Glaucoma 2004;13:461-5. |
|25||Herbert HM, Viswanathan A, Jackson H, Lightman SL. Risk factors for elevated intraocular pressure in uveitis. J Glaucoma 2004;13:96-9.|
|26||Smith RE, Godfrey WA, Kimura SJ. Complications of chronic cyclitis. Am J Ophthalmol 1976;82:277-82.|
|27||Malinowski SM, Pulido JS, Folk JC. Long term visual outcome and complicationa associated with pars planitis. Ophthalmology 1993;100:818-24.|
|28||Donaldson MJ, Pulido JS, Herman DC, Diehl N, Hodge D. Pars Planitis: A 20-Year Study of Incidence, Clinical Features, and Outcomes. Am J Ophthalmol 2007;144:812-7.|
|29||Prieto JF, Dios E, Gutierrez JM, Mayo A, Calonge M, Herreras JM. Pars planitis: epidemiology, treatment, and association with multiple sclerosis Ocul Immunol Inflamm 2001;9:93-102.|
|30||Brockhurst RJ, Schepens CL. Peripheral uveitis. The complication of retinal detachment. Arch Ophthalmol 1968;80:747.|
|31||Deane JS, Rosenthal AR. Course and complications of intermediate uveitis. Acta Ophthalmol Scand 1997;75:82-4.|
|32||Opremack EM, Cowans AB, Orosz CG. Enumeration of autoreactive helper T lymphocytes in uveitis. Invest Ophthalmol Vis Sci 1991;32:2561-7.|
|33||Wetzig RP, Chan CC, Nusenblatt RB. Clinical and immunological studies of parsplanitis in a family, Br J Ophthalmol 1998;72:5-10.|
|34||Nφlle B, Eckardt C. Cellular phenotype of vitreous cells in intermediate uveitis. Dev Ophthalmol 1992;23:145-9|
|35||Green WR, Kincaid MC, Michels RG. Pars planitis. Trans Ophthalmol Soc UK 1981;101:361-7.|
|36||Bora NS, Bora PS, Kaplan HJ. Identification, quantitation, and purification of a 36 kDa circulating protein associated with active pars planitis. Invest Ophthalmol Vis Sci 1996;37:1870-6. |
|37||Boyd SR, Young S, Lightman S. Immunopathology of noninfectious posterior and intermediate uveitides. Surv Ophthalmol 2001;46:209-33.|
|38||Pederson JE, Kenyon KR, Green WR, Maumenee AE. Pathology of pars planitis. Am J Ophthalmol 1978;86:762-74.|
|39||Porter R. Uveitis in association with multiple sclerosis. Br J Ophthalmol 1972;56:478-81.|
|40||Breger BC, Leopold IH.The incidence of uveitis in multiple sclerosis. Am J Ophthalmol 1966;62:540-5.|
|41||Chester GH, Blach RK, Cleary PE. Inflammation in the region of the vitreous base.Pars Planitis Trans Ophthalmol Soc UK 1976;96:151-7.|
|42||Landers PH. Vitreous lesions in Boeck's sarcoid. Am J Ophthalmol 1949;32:1740-1.|
|43||Jabs DA, Johns CA. Ocular involvement in chronic sarcoidosis. Am J Ophthalmol 1986;102:297-301.|
|44||Zierhut M, Foster CS. Multiple sclerosis, sarcoidosis and other diseases in patients with pars planitis. Dev Ophthalmol 1992;23:41-7.|
|45||Ganesh SK, Agarwal M. Clinical and investigative profile of biopsy-proven sarcoid uveitis in India. Ocul Immunol Inflamm 2008;16:17-22.|
|46||Siepmann K, Rohrbach JM, Duncker G, Zierhut M. Intraocular non-Hodgkin's lymphoma and its therapy- a case series of ten patients. Klin Monatsbl Augenheilkd 2004;221:266-72.|
|47||Anshu A, Cheng CL, Chee SP. Syphilitic uveitis: an Asian perspective.Br J Ophthalmol 2008;92(5):594-7. |
|48||Breeveld J, Rothova A, Kuiper H. Intermediate uveitis and Lyme borreliosis. Br J Ophthalmol 1992;76:181-2. |
|49||Lim LL, Rosenbaum JT. Borrelia hermsii causing relapsing Fever and uveitis. Am J Ophthalmol 2006;142:348-9.|
|50||Romαn E, Zamora I, Vera F. Mesangial glomerulonephritis and intermediate uveitis. Nefrologia 2004;24:489-92.|
|51||Cavazza S, Molinari PP. Bilateral intermediate uveitis and acute interstitial nephritis (TINU syndrome). Ultrasonographic documentation of a case. Fr Ophtalmol 1994;17:59-61|
|52||Yalηindaπ FN, Amer R, Forrester JV. Mycophenolate mofetil in the treatment of ocular inflammation in ANCA-associated vasculitis. J Ocul Pharmacol Ther 2008;24:249-54.|
|53||Gallagher MJ, Muqit MM, Jones D, Gavin M. Post-streptococcal uveitis. Acta Ophthalmol Scand 2006;84:424-8.|
|54||Lim WK, Ursea R, Rao K, Buggage RR, Suhler EB, Dugan F, et al. Bilateral uveitis in a patient with autoimmune lymphoproliferative syndrome.Am J Ophthalmol 2005;139:562-3.|
|55||Ormerod LD, Puklin JE, Giles CL. Chronic Propionibacterium acnes endophthalmitis as a cause of intermediate uveitis. Ocul Immunol Inflamm 1997;5:67-8.|
|56||Merle H, Cabre P, Olindo S, Merle S, Smadja D. Ocular lesions in 200 patients infected by the human T-cell lymphotropic virus type 1 in martinique (French West Indies). Am J Ophthalmol 2002;134:190-5. |
|57||Takahashi T, Takase H, Urano T, Sugita S, Miyata K, Miyata N, et al. Clinical features of human T-lymphotropic virus type 1 uveitis: a long-term follow-up. Ocul Immunol Inflamm 2000;8:235-41.|
|58||Kump LI, Cervantes-Castaρeda RA, Androudi SN, Foster CS. Analysis of pediatric uveitis cases at a tertiary referral center. Ophthalmology 2005;112:1287-92. |
|59||Paivφnsalo-Hietanen T, Tuominen J, Saari KM. Uveitis in children: population-based study in Finland. Acta Ophthalmol Scand 2000;78:84-8.|
|60||Rosenberg KD, Feuer WJ, Davis JL. Ocular complications of pediatric uveitis. Ophthalmology 2004;111:2299 -306.|
|61||Narayana KM, Bora A, Biswas J. Patterns of uveitis in children presenting at a tertiary eye care centre in south India. Indian J Ophthalmol 2003;51:129-32.|
|62||de Boer J, Berendschot TT, van der Does P, Rothova A. Long-term Follow-up of Intermediate Uveitis in Children. Am J Ophthalmol 2006;141:616-21.|
|63||Davis JL, Bloch- Michel E. Intermediate uveitis. In: Pepose JS, Holland GN, Wilhelmus KR, editors. Ocular Infection and Immunity. St Louis: Mosby; 1996. p. 676-93. |
|64||Kaplan HJ. Intermediate uveitis (pars planitis, chronic cyclitis): a four-step approach to treatment. In: Saari KM, editor. Uveitis Update.Amsterdam: Experta Medica 1984:169-72.|
|65||Helm CJ, Holland GN. The effects of posterior subtenon injection of triamcinolone acetonide in patients with intermediate uveitis. Am J Ophthalmol. 1995;120:55-64.|
|66||Godfrey WA, Smith RE. Kimura SJ. Chronic cycltis-corticosteroid therapy. Trans Am Ophthalmol. 1976;74:178-88.|
|67||Hogewind BF, Zijlstra C, Klevering BJ, Hoyng CB. Intravitreal triamcinolone for the treatment of refractory macular edema in idiopathic intermediate or posterior uveitis.Eur J Ophthalmol. 2008;18:429-34.|
|68||Malik AR, Pavesio C. The use of low dose methotrexate in children with chronic anterior and intermediate uveitis. Br J Ophthalmol. 2005;89:806-8. |
|69||Teoh SC, Hogan AC, Dick AD, Lee RW. Mycophenolate mofetil for the treatment of uveitis. Am J Ophthalmol 2008;146:752-60. |
|70||Schatz CS, Uzel JL, Leininger L, Danner S, Terzic J, Fischbach M. Immunosuppressants used in a steroid-sparing strategy for childhood uveitis. J Pediatr Ophthalmol Strabismus 2007;44:28-34. |
|71||Galor A, Jabs DA, Leder HA, Kedhar SR, Dunn JP, Peters GB 3rd, et al.Comparison of antimetabolite drugs as corticosteroid-sparing therapy for noninfectious ocular inflammation.Ophthalmology 2008;115:1826-32. |
|72||Whitcup SM. Intermediate uveitis. In: Nusenblatt RB, Whitcup SM, editors. Uveitis- Fundamentals and Clinical Practice.. Philadelphia; Mosby: 2004. p. 291-300.|
|73||Hogan AC, McAvoy CE, Dick AD, Lee RW. Long-term efficacy and tolerance of tacrolimus for the treatment of uveitis. Ophthalmology 2007;114:1000-6. |
|74||Yeh S, Wroblewski K, Buggage R, Li Z, Kurup SK, Sen HN, Dahr S, et al.High-dose humanized anti-IL-2 receptor alpha antibody (daclizumab) for the treatment of active, non-infectious uveitis. J Autoimmun 2008;31:91-7. |
|75||Moorthy RS, et al eds. Intermediate Uveitis. Intraocular Inflammation and Uveitis. American Academy of Ophthalmology. Section 9. Basic and Cinical Science Course 2008. p.166-71.|
|76||Aaberg TM, Cesarz TJ, Flickinger RR Jr. Treatment of pars planitis.I Cryotherapy. Surv Ophthalmol 1977;22:120-5. |
|77||Becker M, Davis JL. Vitrectomy in the Treatment of Uveitis. Am J Ophthalmol 2005;140:1096-105. |
|78||Ganesh SK, Babu K, Biswas J. Phacoemulsification with intraocular lens implantation in cases of pars planitis. J Cataract Refract Surg 2004;30:2072-6. |
|79||Kaufman AH, Foster CS.Cataract extraction in patients with pars planitis. Ophthalmology 1993;100:1210-7. |
|80||Foster CS, Fong LP, Singh G. Cataract surgery and intraocular lens implantation in patients with uveitis. Ophthalmology 1990;96:281-7.|