Method and device for determining lens characteristics including

Details Method and device for determining lens characteristics including Method and device for determining lens characteristics including

1990-10-23

1992-04-28

Evans, F. L.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356125, 356127, G01B 900

Patent

active

051081741

ABSTRACT:
To determine the focal power of an ophthalmic lens, a plurality of light rays are passed through the lens and a photosensitive position sensor is disposed on the exit side of the lens to measure the coordinates of the points at which the light beams impinge on an analysis plane perpendicular to the lens axis. The light rays comprise three light rays on a circle and a light ray on the system axis.

REFERENCES:
patent: 3880525 (1975-04-01), Johnson
patent: 4275964 (1981-06-01), Vassiliadis
patent: 4609287 (1986-09-01), Kohayakawa

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