Diplopia (Double Vision) and Blindness
Diplopia [5] occurs when the eyes send two images to the brain, contrary to normally functioning eyes where each eye sends the same information to the brain. This causes confusion in the brain and can cause you to see double.
Diplopia occurs when MS starts to affect the brain stem. The brainstem helps coordinate eye movement, so any damage to it may cause mixed signals to the eyes. The cranial nerves that pass through the brainstem control the muscles that move the eyes. Any damage in the pathway can affect the uniform movement of the eyes.
Diplopia can resolve completely and spontaneously, though progressive MS can lead to persistent double vision.
The more severe MS gets, the more your symptoms worsen, including your vision disturbance. Partial or full blindness can occur to someone who has MS. Advanced demyelination can destroy your optic nerve or other parts of your body responsible for vision. This can permanently affect eyesight.