Optic neuritis refers to inflammation of the optic nerve. It is usually associated with multiple sclerosis. The age group usually affected is 20 to 40 years old. Optic neuritis associated with multiple sclerosis is usually unilateral. The common presenting complaints are blurred vision, pain in the eye, and seeing flashes. The ability to see red color is mostly impaired. The symptoms may last for few hours to few months. Occasionally, the loss of peripheral vision is permanent. The management of multiple sclerosis usually involves steroids. The optic neuritis associated with multiple sclerosis may be recurrent. Reference: https://www.webmd.com/eye-health/ss/slideshow-unusual-eye-conditions Image via: https://journal.opted.org/article/sudden-blind-spots-and-halos-a-teaching-case-report-of-acute-optic-neuritis-associated-with-multiple-sclerosis/