Spherical Equivalent

Question 1

What is spherical equivalent used for

Answer 1

1) Determine if a spherical -cylinder Px matches SCL
2) used for the spherical lens which would concert a case of simple, compound, or mixed astigmatism into a case of equally mixed astigmatism

Question 2

Spherical Equivalent Calculation

Answer 2

Add the sum of the sphere power with half of the cylinder power, and ignore the axis