Optic neuritis is an inflammation of the optic nerve, which transmits visual information from the eye to the brain. This condition can cause symptoms such as blurred vision, loss of color vision, and pain, especially when moving the eyes. It often affects one eye but can occur in both. The exact cause of optic neuritis is not always clear, but it is commonly associated with multiple sclerosis (MS), an autoimmune disease. Diagnosis typically involves a thorough eye examination, imaging tests like MRI, and sometimes a lumbar puncture to analyze cerebrospinal fluid. Treatment may include corticosteroids to reduce inflammation.