The purpose of this research study is to determine methods that will better determine whether someone has MS and to develop ways to measure the disease. These tests will help doctors learn about vision and how the brain processes information from your eyes in people with MS and healthy people. You will be asked to spend the day at CHOP to complete vision testing and other study procedures. Please contact Amy Lavery (laverya@email.chop.edu; 267-425-2136) if you are interested!