Aspheric lens blank

Details Aspheric lens blank Aspheric lens blank

1989-05-22

1991-10-08

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351167, 359708, G02C 702, G02B 304

Patent

active

050549049

ABSTRACT:
The present invention provides an aspherical spectacle lens blank. The lens blank is generally circular in shape and includes a central circular zone which is surrounded by three or more concentric outer zones. For a plus power lens, the outer zones decrease in diopter refraction and, conversely, for a minus power lens, the outer zones increase in diopter refraction from the central zone and to the outer peripheral zone. The lens blank of the present invention is lighter and thinner than the previously known spectacle lens blanks.

REFERENCES:
patent: 4073578 (1978-02-01), Welsh
patent: 4185897 (1980-01-01), Frieder
patent: 4538887 (1985-09-01), Bristol
Renier, G. L.; "Welsh Four-Drop Aspheric Lenses"; Optometric Weekly; Jun. 2, 1977; pp. 621-624.

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