Practice Quiz

Ophthalmic Assistant

Category - Visual Assessment

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If a person’s vision is 20/15, the number that denotes the distance from which a normal eye can see what the patient can see at 20 feet is known as
  1. numerator.
  2. denominator.
  3. 20 feet.
  4. 15 feet.
Explanation
Answer: B - denominator.

If a person’s vision is 20/15, the number that denotes the distance from which a normal eye can see what the patient can see at 20 feet is known as the denominator. The denominator is the bottom number in the fraction. In this case it is 15, meaning that what the patient can see at 20 feet, a normal eye can see at 15-in other words, the patient has better than normal vision.
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