An inflammation of the optic nerve (optic neuritis) often appears as a first presentation of MS. In the event of optic neuritis, there is a rapid decline of vision in one or both eyes. Colour vision is also often impaired. This is usually coupled with pain in or behind the eye, or pain when moving the eye. This problem generally has a good recovery.

Diplopia or double vision occurs as a result of damage to nerves in the brainstem. The term nystagmus refers to involuntary rhythmic movement of the eyes. These complaints can vary from day to day. Blurred vision, or vision as if you're looking through steamed up glasses, often occurs in both eyes at the same time. This is usually the result of more chronic damage to the optic nerves or brain.