Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1996-06-21
1998-09-08
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
G02C 706
Patent
active
058052658
ABSTRACT:
A progressive lens including, along a principal meridional line dividing a refracting surface of the lens into a nasal side area and a temporal side area, a far viewing portion having a surface refracting power corresponding to a far view, a near viewing portion having a surface refracting power corresponding to a close-range view, and an intermediate viewing portion continuously connecting the refracting powers of the two portions together between the far viewing portion and the near viewing portion, a distance along the principal meridional line between a far viewing center of the far viewing portion and a near viewing center of the near viewing portion being within 18 mm, a width of a clear vision area in the near viewing portion being greater than or equal to a width of a clear vision area in the far viewing portion.
REFERENCES:
patent: 4537479 (1985-08-01), Shinohara et al.
patent: 4762408 (1988-08-01), Shinohara
patent: 5123725 (1992-06-01), Winthorp
patent: 5137343 (1992-08-01), Kelch et al.
Nikon Corporation
Sugarman Scott J.
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