The next step to perform is visual fields testing. The purpose is to determine if the patient has a visual field deficit. It uses flashing lights of varying brightness to assess the sensitivity and health of visual pathways. The visual pathway extends from the eye all the way to the back of the brain. The assessment of the visual field is useful in detecting interference along those pathways. Think of the visual field assessment in four quadrants of the patient’s vision. So, you’ll have your right upper and your left upper, and your lower left and your lower right. Some of the problems it helps identify range from glaucoma, retinal disease, neurological disorders, along with vascular anomalies.