Certified Ophthalmic Assistant Practice Exam

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What does the numerator stand for in the 20/20 notation?

  1. distance from patient's eyes to the cahrt

  2. size of the letter

  3. distance at which the letter could subtend one minute of arc

  4. distance from the chart

The correct answer is: distance at which the letter could subtend one minute of arc

In the 20/20 notation used in optometry, the numerator represents the distance at which the letter could subtend one minute of arc. This means that the numerator (in this case, 20) indicates the distance at which a person with normal vision can see details that subtend an angle of one minute of arc. This notation is commonly used to assess visual acuity in eye examinations. It's important in determining the sharpness or clarity of a person's vision at a specified distance.

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