Visual field testing is quick automated mapping of how light enters your eye and travels through your visual system to your brain. It gives Dr. Ericksen valuable information about your central and peripheral field of view and how the world looks to you. This testing assists in detecting field changes in individual eyes that you may not notice because you are binocular (two eyed). TBI, Multiple Sclerosis, overactive thyroid, stroke, and high risk medications can affect your field of vision.