Practice Quiz

Ophthalmic Assistant

Category - Lensometry and Spectacle Skills

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What does it mean when the mires cannot be centered in the lensometer?
  1. The stage must be move up
  2. The stage must be moved down
  3. The lens prism has been ground into the lens
  4. The power dial needs to be rotated
Explanation
Answer: C - The lens prism has been ground into the lens

If the mires cannot be centered in the lensometer, it means the prism has been ground into the lens. To compensate for this, the reticle contains concentric circles that can be used to measure small amounts of prism. There may also be a dial at the opposite end of the reticle carrier that measures higher amountsof prism.
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