Progressive power ophthalmic lens

Details Progressive power ophthalmic lens Progressive power ophthalmic lens

1980-05-05

1982-02-16

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G02C 706

Patent

active

043156738

ABSTRACT:
In the disclosed lens, one lens surface is divided into an upper distance-vision portion FT, a lower near-vision portion NT, and a varying or transitional region PB between the two other portions. In the upper distance-vision portion, the surface contains a far reference point B.sub.F and exhibits predetermined average distance-vision surface refractive powers D.sub.F. The lower near-vision portion contains a near-vision reference point B.sub.N and has predetermined average near-vision surface refractive powers D.sub.N. The transitional region exhibits average surface refractive powers D.sub.P which effect a smooth transition from the distance-vision portion to the near-vision portion. The surface is divided into a temporal portion and a nasal portion by a principal meridian M which forms an umbilical line.

REFERENCES:
patent: 2878721 (1959-03-01), Kanolt
patent: 3910691 (1975-10-01), Maitenaz
patent: 4055379 (1977-10-01), Winthrop
patent: 4056311 (1977-11-01), Winthrop
patent: 4062629 (1977-12-01), Winthrop
patent: 4240719 (1980-12-01), Guilino et al.

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