Blurred vision is considered one of the first warning signs of MS. The disease can cause a condition known as optic neuritis, or inflammation of the optic nerve. This results in worsening vision, blurred vision, color blindness, eye pain, or a loss of contrast in one or both of the eyes.
The vision problems are typically a byproduct of clinically isolated syndrome (CIS), which is oftentimes later diagnosed as multiple sclerosis. However, CIS does not always become MS. The syndrome occurs when your body mistakes myelin as a foreign entity and causes damage to the