ABO NOCE Basic Opticianry

Category - Ophthalmic Optics

An astigmatism prescription is one that can contains
  1. Plus powers
  2. Minus powers
  3. Plano power
  4. All of the above
Explanation
Answer: D - An astigmatism prescription is one that can contain any power but must have two powers that are perpendicular to each other.

These are called the sphere power and the cylinder power.
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