Pars Planitis

What is Pars Planitis?

Pars planitis is a form of intermediate uveitis. Uveitis is a group of inflammatory diseases that produces swelling in the eye tissue, leading to vision loss. Pars planitis occurs in the eye’s midsection, or the pars plana, where the iris and sclera touch.

Causes, Symptoms & Treatment

Swelling occurs in the pars plana from the inflammatory responses inside the eye. Uveitis may be caused by autoimmunity, or an attack from the body’s own immune system, as white blood cells rush to the tissues of the eye. The build up of these white blood cells produces swelling and heat, destroying the tissues and damaging the lens, iris and retina.


Symptoms of pars planitis include blurred vision, floaters, flashes, redness of the eye and eye pain. Debris from the build up of cells moves to the center of the eye, lodging in the eye fluid (vitreous) causing floaters or spots in the visual field. Inflammation of the macula leads to blurred vision and this swelling of the retina due to pars planitis is known as cystoid macular edema.


Anti-inflammatory medication in the form of eye drops, pills, or injections is usually recommended to alleviate pain, prevent further tissue damage and restore loss of vision. In some cases, when this disease affects both eyes, immunosuppressive oral medications will be prescribed. This type of treatment requires regular blood tests for careful monitoring.