Certified Ophthalmic Assistant Practice Exam

Which test is used to assess stereopsis?

1. Titmus/Wirt

2. Ishihara

3. Snellen

4. Keratometry

The correct answer is: Titmus/Wirt

Stereopsis is a critical component of depth perception, and it involves the brain's ability to perceive depth by integrating the slightly different images from each eye. The Titmus/Wirt test is specifically designed to assess stereopsis by presenting images that require binocular vision to evaluate the quality of depth perception. This test typically includes images of a fly or other target that is positioned at varying distances, incentivizing subjects to use their two eyes together to identify depth differences. The other tests mentioned serve different purposes. The Ishihara test is used to assess color vision, not depth perception. The Snellen test is designed to measure visual acuity, which evaluates how well one can see at a distance but does not directly relate to binocular depth perception. Keratometry is utilized to measure the curvature of the cornea, which is important for understanding refractive errors but is not involved in assessing stereopsis. Thus, the Titmus/Wirt test is the most appropriate choice for evaluating stereopsis effectively.