What would be the spherical equivalent of a (-2.00 + 2.00x90) lens?
A)-3.00
B)-1.00
C)+1.00
D)-2.00

Question

Quizplus · Accepted Answer

(-1.00)
The spherical equivalent of a (-2.00 + 2.00 x 90) lens would be -1.00. The spherical equivalent is computed by algebraically adding half the cylinder power to the sphere power of a spherocylinder. It represents the average of the two powers that make up the spherocylinder. In this case: (-2.00) + (+2.00-(+1.00)) = (-1.00).

What Would Be the Spherical Equivalent of a (-2