Method of designing a non-progressive multifocal ophthalmic lens

Details Method of designing a non-progressive multifocal ophthalmic lens Method of designing a non-progressive multifocal ophthalmic lens

1989-06-26

1990-08-28

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351168, 351171, G02C 706

Patent

active

049520482

ABSTRACT:
The present invention relates to a multifocal ophthalmic lens which comprises a first substantially spherical area for distance viewing, a second substantially spherical area for near viewing having a desired width and height and being surrounded on a plurality of sides by the first area, and relatively narrow areas intermediate the first and second areas for blending the second area into the first area. The lens design of the present invention may also include an optional third substantially spherical area adjacent the second area for increasing the near viewing range in a substantially contiguous manner.

REFERENCES:
patent: 1448052 (1923-03-01), Brilhart
patent: 1518405 (1924-12-01), Glancy
patent: 1951506 (1934-03-01), Duckwall
patent: 3563057 (1971-02-01), Rosenbauer
patent: 3687528 (1972-08-01), Maitenaz
patent: 3711191 (1973-01-01), Tagnon
patent: 4461550 (1984-07-01), Legendre
patent: 4484804 (1984-11-01), Mignen
patent: 4514061 (1985-04-01), Winthrop
patent: 4592630 (1986-06-01), Okazaki

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