Lens form

Question 1

Define:

Spherical Lenses

Answer 1

A spherical lens is a lens whose surface has the shape of (part of) the surface of a sphere.

Question 2

Define:

Base curve in ophthalmic lenses

Answer 2

The base curve of a lens is the surface curve that serves as the basis or starting point from which the remaining curves will be calculated.

Question 3

What is meant by flat and curved in ophthalmic lenses

Answer 3

1