American Board of Opticianry (ABO) Practice Test

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What is the purpose of Prentice's Rule as mentioned in the text?

  1. The blue portion of light on the visible spectrum

  2. Characteristic of a minus lens

  3. Power times 0.5

  4. Calculate prismatic effect

The correct answer is: Calculate prismatic effect

Prentice's Rule is a mathematical formula used to calculate the amount of prism needed in a prescription lens. The other options do not accurately describe the purpose of Prentice's Rule. Option A refers to the visible spectrum of light, which is not related to Prentice's Rule. Option B may be referring to the characteristic of a minus lens, but it does not explain the significance or purpose in relation to Prentice's Rule. Option C is a general statement about power and does not pertain to Prentice's Rule. The only option that accurately explains the purpose of Prentice's Rule is option D.

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