Certified Ophthalmic Assistant Practice Exam

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If poor vision is simply due to refractive error, the acuity should improve with use of a

  1. Patch

  2. Lensometer

  3. Phoropter

  4. Pinhole

The correct answer is: Pinhole

When poor vision is solely due to refractive error, using a pinhole can improve visual acuity. A pinhole works by blocking peripheral rays of light that do not focus properly on the retina due to refractive errors such as myopia, hyperopia, or astigmatism. By eliminating these peripheral rays, only the central, focused light can enter the eye, which can improve visual acuity temporarily. The other options, such as a patch, lensometer, or phoropter, do not directly address refractive error and would not typically improve visual acuity in cases of refractive error alone.

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