Practice Quiz

ABO NOCE Basic Opticianry

Category - Ophthalmic Optics

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The amount of induced prism and the direction of the prism are determined by __________ . Choose all that apply.
  1. The position of the eyes
  2. The prescription
  3. The position of the nose
  4. None of the above
Explanation
Answers: A and B - The position of the eyes and the prescription

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 = cfwhere:

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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