Practice Quiz

ABO NOCE Basic Opticianry

Category - Ophthalmic Optics

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A Fresnel prism is
  1. The name for the prism ground into lenses
  2. The name for the plastic sheet of press-on prisms that can be added to existing lenses
  3. None of the above
Explanation
Answer: B - A Fresnel prism is the name for the plastic sheet of press-on prisms that can be added to existing lenses.

In many circumstances for low vision patients, a Fresnel prism continues to be used when grinding prism into a lens will not work for that patient's circumstances. This press-on prism can highly reduce the thickness of a high powered prism and can be placed anywhere on the patient's lens as needed.
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