Spectacle prescript lens distortion tester

Details Spectacle prescript lens distortion tester Spectacle prescript lens distortion tester

1979-02-02

1981-01-27

Corbin, John K.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

351 33, G01B 900, A61B 300

Patent

active

042472016

ABSTRACT:
A visual test target is disclosed which is useful for determining whether a subject's vision is being distorted by previously prescribed spectacle lenses. The target comprises two concentric circles within a square. The larger circle is tangent to each side of the square, and the area between the two circles is imprinted in solid black.

REFERENCES:
patent: 3011394 (1961-12-01), Sherman et al.

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