Visual field testing assesses the full horizontal and vertical range of what you are able to see peripherally. This range is commonly referred to as “side vision.”
Visual field tests assess the potential presence of blind spots which could indicate eye diseases. A blind spot in the field of vision can be linked to a variety of specific eye diseases, depending on the size and shape of the scotoma.
Many eye and brain disorders can cause peripheral vision loss and visual field abnormalities.
For example optic nerve damage caused by glaucoma creates a very specific visual field defect. Other eye problems associated with blind spots and other visual field defects include optic nerve damage (optic neuropathy) from disease or damage to the light-sensitive inner lining of the eye (retina).
Brain abnormalities such as those caused by strokes or tumors can affect the visual field. In fact, the location of the stroke or tumor in the brain can frequently be determined by the size, shape and site of the visual field defect.