Practice Quiz

Certified Ophthalmic Medical Technologist (COMT)

Category - COMT

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True or False:

If you know the diopter power of a lens, taking the inverse will give you the focal length.

  1. True
  2. False
Explanation

Answer: A

The eye contains two focusing lenses for a combined 60 diopters of focusing power. This means that the lenses will focus at roughly 1/60th of a meter (the reciprocal of 60). If an eyeball is exactly 1/60th of a meter in length, the light is focused directly on the retina. 

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