Abstract

The fast progress in the design and manufacture of complex lenses for visual correction has not been accompanied by a comparable progress in test and measurement equipment. The traditional focimeter averages an area of several millimeters, and requires a tedious process of scanning several thousand points on the surface, which would take hours to complete. The power is measured using a beam in a direction normal to the back surface, which in general does not correspond to normal usage.

© 1993 Optical Society of America