Practice Quiz

ABO NOCE Basic Opticianry

Category - Ophthalmic Optics

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A lens consisting of two cylinders of equal power but of opposite designation, one being plus and the other being minus, and their axes set 90 degrees apart is known as a:
  1. Correcting cylinder
  2. Cross cylinder
  3. Spherical equivalent
  4. Prism
Explanation
Answer: B - Cross cylinder

A lens consisting of two cylinders of equal power but of opposite designation, one being plus and the other being minus, and their axes set 90 degrees apart is known as a cross cylinder. A cross cylinder is used to determine and check the axis of the correcting cylinder as well as to check its power.
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