Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1989-12-22
1991-02-26
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
35016216, 35016222, 350452, 351159, 351168, 623 6, G02C 704, G02B 2744, G02B 308, A61F 216
Patent
active
049957155
ABSTRACT:
A diffractive multifocal optical element comprising a phase zone plate containing annular concentric zones in which the zones are spaced substantially proportional to .sqroot.n, the zones possess stepped facets that introduce a discontinuity in optical path length of less than .lambda./2.
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