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Home >> Eye Health >> Optic Neuritis
Optic neuritis (or retrobulbar neuritis ) is the inflammation of the optic nerve that may cause a complete or partial loss of vision. It is a variable condition and can present with any of the following symptoms: blurring of vision, loss of visual acuity, loss of some or all colour vision, complete or partial blindness and pain behind the eye. The visual deficit may worsen over a period of approximately 7 days, then typically remains stable (at that level) for 3 to 8 weeks, followed by gradual visual improvement. The great majority of patients with optic neuritis will recover much of their vision within 6 months of the onset of optic neuritis. It is not uncommon to have an episode of optic neuritis prior to being diagnosed with MS. Most patients with optic neuritis experience a sudden onset of decreased vision along with pain and soreness when moving the eye. Indeed, for this group, ON is often a misleading diagnosis and the cause is often ischemic optic neuropathy or some other condition.Testing peripheral vision may reveal loss of vision at the periphery (side) of the visual field. Magnetic resonance imaging (MRI) may show evidence of multiple sclerosis or, rarely, a tumor pressing on the optic nerve.The nerve of one or both eyes may be affected. Some people, especially children, develop optic neuritis following a viral illness such as mumps, measles or a cold. Optic neuritis usually affects only one eye and may be a recurring problem with certain diseases such as MS. Optic neuritis refers to swelling or inflammation of the optic nerve . There is also frequently a history of pain with eye movement, and this may precede the visual loss. Pathological studies in patients with ON associated with MS have shown that the demyelinative lesions in the optic nerve are similar to the MS plaques seen in the brain, with an inflammatory response marked by perivascular cuffing, T cells, and plasma cells.In fact, optic neuritis is often the initial sign of MS. With optic neuritis, the optic nerve becomes swollen and the nerve fibers do not work properly. Vision can range from near normal to very poor depending on the number of inflammed nerve fibers. Vision in the involved eye or eyes can range from almost normal to complete blindness. There may be pain with eye movement. Depending on the cause, vision may recover only to deteriorate later in repeat episodes of worsening vision. It is not uncommon to have an episode of optic neuritis prior to being diagnosed with MS. In fact, optic neuritis is often the initial sign of MS. Some people, especially children, develop optic neuritis following a viral illness such as mumps, measles or a cold. In others, optic neuritis may occur as a sign of a neurologic disease affecting nerves in various parts of the body. Causes of optic NeuritisThe common causes of optic Neuritis :
Symptoms of optic NeuritisSome common symptoms of optic Neuritis :
Treatment of optic Neuritis
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