Practice Quiz

Ophthalmic Assistant

Category - Lensometry and Spectacle Skills

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The amount of induced prism and the direction of the prism are determined by
  1. the position of the eyes.
  2. the prescription.
  3. the position of the nose.
  4. A and B.
Explanation
Answer: D - A and B.

The amount of induced prism and the direction of the prism are determined by both the prescription and the position of the eyes. Prentice's Rule is a formula used to determine the amount of induced prism in a lens:
P=cf where:
P is the amount of prism correction (in prism diopters)
c is decentration (the distance between the pupil center and the lens's optical center, in centimeters)
f is lens power (in diopters)
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