Practice Quiz

Ophthalmic Technician

Category - Lensometry and Spectacle Skills

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In a lensometer we get a measurement of 2BU in OD and 3BD in OS. What is the total amount of prism that the individual will experience through these glasses?
  1. 5BU in OD
  2. 5BU in OS
  3. 1BU in OD
  4. 1BU in OS
Explanation
Answer: A - The total amount of prism that the individual will experience through these glasses would be 5BU in OD.

To measure the vertical prism, the difference between the two lenses must be considered. Thus 2BU-(-3BD)= 5BU in OD or 5BD in OS. Both ways of writing are correct.
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