Visual Field Test

The visual field is the area you can see when looking straight ahead. Defects in the visual field may result from disorders of parts of the retina (the light-sensitive lining of the back of the eye) or of the optic nerves anywhere along their pathways from the eye to the part of the brain (optic cortex) that analyses sight.

In these tests, visual fields are charted on a large black screen or white bowl. The patient's head is secured to keep a steady line of sight, and one eye is covered. Coloured patches are moved from the out side to the inside around the black screen (spots of coloured light for the white bowl). Responses to seeing a spot, marked on a chart that corresponds to the test screen or bowl, indicate the patient's visual field.

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