Multifocal ophthalmic lens

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

351169, 623 6, G02C 704, A61F 216

Patent

active

051667118

ABSTRACT:
An improved opthalmic lens is disclosed which has a plurality of alternating power zones with a continuously varying power within each zone, as well as in transition from one zone to another. In other words, a plurality of concentric zones (at least two) are provided in which the variation from far to near vision correction is continuous, i.e., from near correction focal power to far correction focal power, then back to near, and again back to far, or vice versa. This change is continuous (progressive), without any abrupt correction changes, or "edges". Two versions of the invention are disclosed. In the first version continuous, alternating power variation is accomplished by a continuously alternating power variation is accomplished by a continuously changing curvature of the lens posterior surface, thereby altering the angle of impact of light rays on the eye. In the second version continuous, alternating power variation is accomplished by creating non-homogeneous surface characteristics having refractive material indexes which continuously vary in the lens radial direction (out from the optical axis).

REFERENCES:
patent: Re25286 (1962-11-01), DeCarle
patent: 1483509 (1924-02-01), Bugbee
patent: 2129305 (1938-09-01), Feinbloom
patent: 2274142 (1942-02-01), Houchin
patent: 2405989 (1946-08-01), Beach
patent: 2511517 (1950-06-01), Spiegel
patent: 3004470 (1961-10-01), Ruhle
patent: 3031927 (1962-05-01), Wesley
patent: 3034403 (1962-05-01), Neefe
patent: 3210894 (1965-10-01), Bentley
patent: 3227507 (1966-01-01), Feinbloom
patent: 3339997 (1967-09-01), Wesley
patent: 3420006 (1969-01-01), Barnett
patent: 3431327 (1969-03-01), Tsuetaki
patent: 3482906 (1969-12-01), Volk
patent: 3542461 (1970-11-01), Girard et al.
patent: 3693301 (1972-09-01), Lemaltre
patent: 3794414 (1974-02-01), Wesley
patent: 3932148 (1976-01-01), Krewalk, Sr.
patent: 4055378 (1977-10-01), Feneberg et al.
patent: 4062629 (1977-12-01), Winthrop
patent: 4073579 (1978-02-01), Deeg et al.
patent: 4162122 (1979-07-01), Cohen
patent: 4195919 (1980-04-01), Shelton
patent: 4199231 (1980-04-01), Evans
patent: 4210391 (1980-07-01), Cohen
patent: 4240719 (1980-12-01), Guilino et al.
patent: 4274717 (1981-06-01), Davenport
patent: 4307945 (1981-12-01), Kitchen et al.
patent: 4315673 (1982-02-01), Guilino et al.
patent: 4338005 (1982-07-01), Cohen
patent: 4340283 (1982-07-01), Cohen
patent: 4377329 (1983-03-01), Poler
patent: 4402579 (1983-09-01), Poler
patent: 4418991 (1983-12-01), Breger
patent: 4504982 (1985-03-01), Burk
patent: 4573775 (1986-03-01), Bayshore
patent: 4580882 (1986-04-01), Nuchman et al.
patent: 4596578 (1986-06-01), Kelman
patent: 4618228 (1986-10-01), Baron et al.
patent: 4618229 (1986-10-01), Jacobstein et al.
patent: 4636049 (1987-01-01), Blaker
patent: 4636211 (1987-01-01), Nielsen et al.
patent: 4637697 (1987-01-01), Freeman
patent: 4641934 (1987-02-01), Freeman
patent: 4693572 (1987-09-01), Tsuetaki et al.
patent: 4704016 (1987-11-01), de Carle
patent: 4720286 (1988-01-01), Bailey et al.
patent: 4752123 (1988-06-01), Blaker
patent: 4759762 (1988-07-01), Grendahl
patent: 4813955 (1989-03-01), Achatz et al.
patent: 4890912 (1990-01-01), Visser
patent: 4898461 (1990-02-01), Portney
"The Shah Bifocal Intraocular Lens Implant", Shah & Shah Intraocular Lens Laboratories, Calcutta, India, no date.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Multifocal ophthalmic lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multifocal ophthalmic lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multifocal ophthalmic lens will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-925333

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.