Dave, this explains better what the Field Vision test is.
Automated perimetry test. This test creates a detailed map of your visual field, and is used for a more specific diagnosis of an ocular condition, or to monitor the progress of an ocular disease.
During this test, you will sit in front of a bowl-shaped device, called a perimeter. Each eye will be tested separately. The eye being tested will look through a lens containing your optical prescription to ensure that you can see well.
Your doctor will instruct you to keep your eye on the center target throughout the test. Lights will begin to flash in different areas of the bowl, some dimmer than others. As you see the lights, you will press a button with your thumb. Any lights that you did not see will be tallied at the end of the test, and provided in a print out for easy reading.
Keep in mind that this test will deliberately flash lights in areas that you cannot see to determine your visual threshold, or the lights you cannot see some of the time— so don’t worry if there is a point in the test where you haven’t pressed the button for a few seconds, this is normal.
