Practice Quiz

Ophthalmic Assistant

Category - Visual Assessment

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Whether or not refractive error is the cause of impaired vision can be confirmed with a
  1. Snellen chart.
  2. pinhole visual acuity test.
  3. potential acuity meter.
  4. contrast sensitivity test.
Explanation
Answer: B - pinhole visual acuity test.

Whether or not refractive error is the cause of impaired vision can be confirmed with a pinhole visual acuity test. The instrument generally used to conduct this test is called a pinhole occluder, which the patient holds over an eye. Because light passes only through the center of the eye's lens, defects in the shape of the lens (errors of refraction) have no effect while the occluder is used.
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