Vis-a-Vis test setup involves which of the following?

Vis-a-Vis test setup involves which of the following?

• A. Polarized glasses and 50 cm distance.
• B. Red-green glasses and 2 meters.
• C. Occlusion of one eye with a patch.
• D. A color-blindness card.

Answer: (A)

Vis-a-Vis is a near stereo assessment that relies on presenting different images to each eye so the brain must fuse them to perceive depth. This is done with polarized glasses, which allow each eye to see only its intended image while keeping the images visually aligned for fusion. The near distance of 50 cm sets an appropriate accommodative and vergence demand, typical for everyday near work like reading, and provides a standardized, reliable measure of stereo function. The other options describe different approaches not used for this test. Red-green glasses would indicate anaglyph stereo, which isn’t how Vis-a-Vis presents its images. Occluding one eye with a patch tests monocular function or suppression rather than binocular depth perception. A color-blindness card screens color vision, not stereo or binocular fusion.

Vis-a-Vis is a near stereo assessment that relies on presenting different images to each eye so the brain must fuse them to perceive depth. This is done with polarized glasses, which allow each eye to see only its intended image while keeping the images visually aligned for fusion. The near distance of 50 cm sets an appropriate accommodative and vergence demand, typical for everyday near work like reading, and provides a standardized, reliable measure of stereo function.

The other options describe different approaches not used for this test. Red-green glasses would indicate anaglyph stereo, which isn’t how Vis-a-Vis presents its images. Occluding one eye with a patch tests monocular function or suppression rather than binocular depth perception. A color-blindness card screens color vision, not stereo or binocular fusion.