If vertical target lines in the distance prescription focus at -2.00 and the same lines focus at +0.50 in the near segment of the lens, the near power should be:

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

If vertical target lines in the distance prescription focus at -2.00 and the same lines focus at +0.50 in the near segment of the lens, the near power should be:

Explanation:
The near add is the extra power needed to shift the focal point from distance to near. If distance focuses at -2.00 D and near focuses at +0.50 D, the eye’s vergence must change by (+0.50) − (−2.00) = +2.50 D. That 2.50 diopter addition is the near power. So the near power should be +2.50 D. The other values would produce smaller or larger shifts and wouldn’t place the near focus at +0.50 D.

The near add is the extra power needed to shift the focal point from distance to near. If distance focuses at -2.00 D and near focuses at +0.50 D, the eye’s vergence must change by (+0.50) − (−2.00) = +2.50 D. That 2.50 diopter addition is the near power. So the near power should be +2.50 D. The other values would produce smaller or larger shifts and wouldn’t place the near focus at +0.50 D.

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