Simultaneous vision optical lens for correcting presbyopia

Details Simultaneous vision optical lens for correcting presbyopia Simultaneous vision optical lens for correcting presbyopia

1990-01-22

1990-12-11

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

623 5, 623 6, G02C 704, A61F 216

Patent

active

049765345

ABSTRACT:
The proximity P of a simultaneous vision optical lens for correcting presbyopia is defined as the reciprocal of the distance D at which a light ray parallel to and at a distance h from its axis crosses the axis after passing through the lens. The curve representing the proximity P of the lens lies between a lower envelope curve P.sub.inf and an upper envelope curve P.sub.sup satisfying the following equations:

REFERENCES:
patent: 4199231 (1980-04-01), Evans
patent: 4418991 (1983-12-01), Breger
patent: 4704016 (1987-11-01), DeCarle
patent: 4778462 (1988-10-01), Grendahl
patent: 4795462 (1989-01-01), Grendahl
patent: 4798609 (1989-01-01), Grendahl

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