Pars Planitis

Rod Foroozan, MD


January 09, 2008


Pars planitis (PP) is an intermediate uveitis that may cause visual loss through a number of mechanisms, including cystoid macular edema and epiretinal membrane formation.[1,2] A characteristic of PP is snowbank (pars plana exudates) or snowball formation. Prior studies have reported that PP may be responsible for 2%-15% of cases of uveitis.


Pars Planitis: A 20-year Study of Incidence, Clinical Features, and Outcomes

Donaldson MJ, Pulido JS, Herman DC, Diehl N, Hodge D
Am J Ophthalmol. 2007;144:812-817


All patients with PP were identified from 1985 to 2004 in Olmsted County, Minnesota, in this retrospective, population-based study. The incidence of PP was 2 per 100,000 persons. The most common causes of decreased vision were epiretinal membrane (36%), cataract (30%), and cystoid macular edema (26%). After 10 years of follow-up, the mean visual acuity was 20/30, with one third of patients having normal visual acuity and not requiring treatment. Multiple sclerosis developed in 3 patients in the study, a rate higher than that expected in those who do not have a history of PP.


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