In Worth 4 Dot testing, which distance tests peripheral suppression?

In Worth 4 Dot testing, which distance tests peripheral suppression?

• A. 1 ft
• B. 3 ft
• C. 10 ft
• D. 20 ft

Answer: (A)

Peripheral suppression is best revealed when the test is done at near distances, because the wide involvement of the peripheral retina becomes more influential in maintaining a single image when fusion demands are high. In Worth 4 Dot, the patient wears red-green glasses and reports how many lights they see and in what colors. At a very close viewing distance (about 1 foot), the overlapping images from both eyes engage a larger portion of the retina, and the system may suppress input from one eye in the peripheral field to avoid diplopia. If suppression is present in the periphery, you’ll notice a deviation from the full four-light perception, indicating that one eye’s peripheral input is being suppressed. At farther distances, the pattern of suppression shifts toward central regions and the test emphasizes different binocular conditions, so the near distance specifically targets peripheral suppression.

Peripheral suppression is best revealed when the test is done at near distances, because the wide involvement of the peripheral retina becomes more influential in maintaining a single image when fusion demands are high. In Worth 4 Dot, the patient wears red-green glasses and reports how many lights they see and in what colors. At a very close viewing distance (about 1 foot), the overlapping images from both eyes engage a larger portion of the retina, and the system may suppress input from one eye in the peripheral field to avoid diplopia. If suppression is present in the periphery, you’ll notice a deviation from the full four-light perception, indicating that one eye’s peripheral input is being suppressed. At farther distances, the pattern of suppression shifts toward central regions and the test emphasizes different binocular conditions, so the near distance specifically targets peripheral suppression.