Testing your side vision

VISUAL FIELD TESTING

A test to measure your visual field in order to detect sight loss.

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Visual Field Testing

A visual field test determines just how far an eye can see without moving, and how sensitive vision is in different parts of the vision field. Basically, it helps know how well and how far up, down, left and right a person can see without actually moving their eye.

Glaucoma, diabetes, stroke, certain tumors and retinal disorders are some medical conditions that require regular visual field testing. People who have suffered a head or eye injury also undergo this test to see if vision is affected and to determine the extent of injury.

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SYMPTOMS

1. People who already have or are at risk of certain medical conditions need to get this test done. It is also done to measure the performance of the optic nervous system.
2. Glaucoma, diabetes, stroke, certain tumors and retinal disorders are some medical conditions that require regular visual field testing.
3. People who have suffered a head or eye injury also undergo this test to see if vision is affected and to determine the extent of injury.

TESTING PROCESS

Visual Field Tests are non-invasive and take just a few minutes to perform. The longest type of test takes up to 20 minutes, most others are done in less time.

These tests can be performed manually or on a computer.

To perform the test manually, a doctor will keep the patients eye stable by asking them to focus on their finger or a pen and will move an object around to test field vision.

The Confrontation Visual Field test is another manual test where the doctor sits in front of the patient at a distance and holds his arms straight out to the sides, then slowly moves them inwards to see at which point his arms come into the patient’s field of vision.

In the computerized test, the patient is asked to place their chin on a rest and focus on a point on the screen in front of them. Tiny spots of light on the screen test the vision field.

The Amsler Grid test is a computerized test using a grid made of straight lines. Patients look at a spot in the middle of the grid, and let the doctor know where the straight lines appear blurred or wavy. This test has its limitations as it only measures the center of the vision field and provides limited information.

In either case, one eye is covered while the other is tested, and the patient can blink normally as long as the focus remains stable.

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Conditions

There are no pre-testing requirements for a vision field test, but it is better if the patient arrives for the test well-rested and relaxed.

Effects

There are no after-effects of a vision field test.

Risks

There are no risks associated with a vision field test.

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