Diffractive multi-focal lens

Details Diffractive multi-focal lens Diffractive multi-focal lens

1993-11-30

1998-06-02

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

359569, 359571, 359575, 359665, 623 6, G02C 704, G02B 518, G02B 314, A61F 216

Patent

active

057608717

ABSTRACT:
A tri-focal diffractive lens defining three foci, for viewing a band of light having a representative wavelength of .lambda., including a diffractive surface having a number of optical heights, h.sub.o, wherein the difference between the highest and the lowest optical heights is, modulo .lambda., substantially different from .lambda./2, wherein each of the foci receives at least 20% of light incident on the lens.

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