Practice Quiz

Ophthalmic Assistant

Category - Lensometry and Spectacle Skills

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What would be the spherical equivalent of a (-2.00 + 2.00x90) lens?
  1. -3.00
  2. -1.00
  3. +1.00
  4. -2.00
Explanation
Answer: B - (-1.00)

The spherical equivalent of a (-2.00 + 2.00 x 90) lens would be -1.00. The spherical equivalent is computed by algebraically adding half the cylinder power to the sphere power of a spherocylinder. It represents the average of the two powers that make up the spherocylinder. In this case: (-2.00) + (+2.00-(+1.00)) = (-1.00).
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