ABO NOCE Basic Opticianry

Category - Ophthalmic Optics

In the following lens prescription, which number represents the spherical power: +1.00 +0.50 x 70
  1. 1.00
  2. 0.50
  3. 70
  4. The spherical power is not part of the lens prescription
Explanation
Answer: A - 1.00

The spherical power in a spherocylindrical lens prescription is typically the first number, in this case it is 1.00. The 0.50 represents the cylindrical power and the 70 represents the axis.
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