Progressive multifocal lens

Details Progressive multifocal lens Progressive multifocal lens

1997-10-20

1999-04-06

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

058925651

ABSTRACT:
A progressive multifocal lens is provided with a near part N, a defined vision part F, and an intermediate part P along the main meridian curve MM'. The near center B of the lens is separated from near eyepoint E by a distance of substantially 2 mm to 8 mm in the lower part along the main meridian curve. The refractive power K.sub.E at the near eyepoint, refractive power K.sub.A at the defined center A, and refractive power K.sub.B at the near center B satisfy the condition:

REFERENCES:
patent: 4762408 (1988-08-01), Shinohara
patent: 4786160 (1988-11-01), Furter
patent: 4796988 (1989-01-01), Dufour et al.
patent: 4854689 (1989-08-01), Dufour et al.

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