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Visual Field

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What is visual field?

Visual field is the vision that is perceived by the retina. It can be measured using a visual field test to check for problems in ones vision, or range of vision.

How is it tested?

Visual field is tested by conducting a visual field test. There are a number of different machines that can perform this test.

The most commonly used is the automated perimetry exam. This is where the patient sits in front of a machine with a concave dome with a target in the center. The eye that is not being tested is covered and a button is given to the patient to be used during the exam. The patient is set in front of the dome and asked to focus on the target at the center. A computer then shines lights on the inside dome and the patient clicks the button whenever a light is seen. The computer then automatically maps and calculates the patient's visual field.