Which two tests are used to assess stereoacuity thresholds?

Which two tests are used to assess stereoacuity thresholds?

• A. Titmus and Randot measure color discrimination.
• B. Titmus and Randot measure stereoacuity thresholds.
• C. Titmus and Randot measure ocular motility.
• D. Titmus and Randot measure depth from motion.

Answer: (B)

Stereoacuity thresholds are the smallest depth differences your two eyes can detect together, i.e., the finest disparity that reliably yields a sense of depth. Titmus and Randot are the standard tools used to measure this. The Titmus test presents images with known disparities, including recognizable shapes and a “fly,” and you indicate which items appear to pop out in depth. The Randot test uses random-dot stereograms where a hidden shape becomes visible only when both eyes fuse the images correctly, and you identify that shape. The point at which you can consistently perceive the depth corresponds to your stereoacuity threshold. These tests are specifically about binocular depth perception and not about color discrimination, eye movement (ocular motility), or depth perception from motion, which is why they’re the appropriate choice for assessing stereoacuity thresholds.

Stereoacuity thresholds are the smallest depth differences your two eyes can detect together, i.e., the finest disparity that reliably yields a sense of depth. Titmus and Randot are the standard tools used to measure this. The Titmus test presents images with known disparities, including recognizable shapes and a “fly,” and you indicate which items appear to pop out in depth. The Randot test uses random-dot stereograms where a hidden shape becomes visible only when both eyes fuse the images correctly, and you identify that shape. The point at which you can consistently perceive the depth corresponds to your stereoacuity threshold. These tests are specifically about binocular depth perception and not about color discrimination, eye movement (ocular motility), or depth perception from motion, which is why they’re the appropriate choice for assessing stereoacuity thresholds.