Which test is used to test stereopsis?

The Wirt test is specifically designed to evaluate stereopsis, which is the ability to perceive depth and three-dimensional structure from visual information in the two-dimensional images received by the eyes. This test typically involves the use of specially designed stereoscopic plates that present images to each eye; the individual must identify which images appear to be elevated or separated in depth, indicating their ability to perceive depth.

This contrasts with the other options: the Pinhole test is utilized primarily for checking refractive errors; the Schirmer test measures tear production and assesses dry eye conditions; and the Ishihara test is used for color vision testing. None of these tests are aimed at assessing depth perception, highlighting the distinct role of the Wirt test in evaluating stereoscopic vision.