Apparatus and method for inspecting a test lens, method of makin

Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function

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G01M 1100

Patent

active

053030230

ABSTRACT:
An apparatus for inspecting a test lens, such as an intraocular lens, comprising a light source and collimating lens positioned to receive light from the light source and direct collimated light to the test lens. A plurality of targets are positionable at the object focal plane of the collimating lens so that there is an image of the target at the image focal space of the test lens. The image of the target has generally radially extending and alternating first and second sectors with each of the first sectors being relatively light and each of the second sectors being relatively dark. Modulation transfer function is determined by determining the image contrast along a combination of selected ring-shaped regions of the image.

REFERENCES:
patent: 3743427 (1973-07-01), Weiser
patent: 3930732 (1976-01-01), Holly
patent: 3938892 (1976-02-01), Klingman, III
patent: 3977795 (1976-08-01), Buschmann
patent: 4241996 (1980-12-01), Weiser
patent: 4324459 (1982-04-01), Gerharz
patent: 4653909 (1987-03-01), Kuperman
patent: 4854669 (1989-08-01), Birnbach et al.

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