![]() Why do some people need to have visual field tests many times? ![]() By repeating more visual field tests at regular intervals, doctors can also tell whether the patient is getting better or worse. ![]() There are well-known patterns in the test results that help doctors recognize certain types of injury or disease. Problems with any part of this system can change the visual field. The visual part of the nervous system includes the retina (the "film" in the camera-like eye), the optic nerve (the "wire" that carries images from the retina to the brain), and the brain itself. Some people with glaucoma do not notice any problems with their vision, but the visual field test shows that peripheral vision is being lost.Ī visual field test can also help the doctor find out more about the part of the nervous system that allows us to see. The visual field test can help the doctor find early signs of diseases like glaucoma that damage vision gradually. How sensitive the vision is in different parts of the visual field.How far up, down, left and right the eye sees without moving.When an object moves far enough to the side, it disappears from our vision completely. The farther away from the center of our vision an object is, the less clearly we can see it. That is why we turn our eyes toward objects that we want to see better. Vision is usually best right in the middle of the visual field. Most people are familiar with this as "peripheral vision." The entire area that we see is called the visual field. Without moving our eyes, we see not only what is straight ahead, but some of what is above, below, and off to either side. We normally see a wide area of the space in front of us.
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