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Class Information
Number: 351/161
Name: Optics: eye examining, vision testing and correcting > Spectacles and eyeglasses > Ophthalmic lenses or blanks > Eye contact type > Multifocal
Description: Subject matter wherein the contact lens comprises two zones of different focal length, one zone to correct the distance vision and another zone to correct the reading vision.










Patents under this class:
1 2 3 4 5 6 7 8 9

Patent Number Title Of Patent Date Issued
4909621 Method of making hydrogel contact lenses having aspheric front surfaces Mar. 20, 1990
4909818 System and process for making diffractive contact Mar. 20, 1990
4898461 Multifocal ophthalmic lens Feb. 6, 1990
4890912 Trifocal eye-contact lens Jan. 2, 1990
4890913 Zoned multi-focal contact lens Jan. 2, 1990
4881805 Progressive intensity phase bifocal Nov. 21, 1989
4881804 Multifocal phase plate with a pure refractive portion Nov. 21, 1989
4874234 Toric contact lens with displaced center of gravity Oct. 17, 1989
4869587 Presbyopic contact lens Sep. 26, 1989
4863466 Intra-ocular implant lens Sep. 5, 1989
4861152 Contact lens having at least one aspherical, progressive multifocal face, process for the preparation thereof and use of this contact lens as an intra-ocular implant to be substituted for the Aug. 29, 1989
4859049 Contact lens for oriented optical corrections Aug. 22, 1989
4850689 Near vision contact lens and methods of making and using it Jul. 25, 1989
4830481 Multifocal diffractive lens May. 16, 1989
4813777 Bi-focal corneal contact lens Mar. 21, 1989
4798609 Radially segmented zone of focus artificial lens Jan. 17, 1989
4798608 Laminated zone of focus artificial lens Jan. 17, 1989
4795462 Cylindrically segmented zone of focus artificial lens Jan. 3, 1989
4777684 Apparatus and method for custom tinting soft contact lenses by dispenser of lenses Oct. 18, 1988
4778462 Multiple element zone of focus artificial lens Oct. 18, 1988
4765728 Contact lens with a back surface having second-order portions Aug. 23, 1988
4759762 Accommodating lens Jul. 26, 1988
4752123 Concentric bifocal contact lens with two distance power regions Jun. 21, 1988
4728182 Bi-focal contact lens Mar. 1, 1988
4710193 Accommodating intraocular lens and lens series and method of lens selection Dec. 1, 1987
4704016 Bifocal contact lenses Nov. 3, 1987
4702573 Variable powered contact lens Oct. 27, 1987
4693572 Monocentric bifocal corneal contact lens Sep. 15, 1987
4655565 Ophthalmic lenses with diffractive power Apr. 7, 1987
4641934 Ophthalmic lens with diffractive power Feb. 10, 1987
4642112 Artificial eye lenses Feb. 10, 1987
4640595 Aspheric contact lens Feb. 3, 1987
4637697 Multifocal contact lenses utilizing diffraction and refraction Jan. 20, 1987
4636049 Concentric bifocal contact lens Jan. 13, 1987
4636211 Bifocal intra-ocular lens Jan. 13, 1987
4632773 Method of making a contact lens material which may be identified Dec. 30, 1986
4618227 Soft contact lens Oct. 21, 1986
4618229 Bifocal contact lens Oct. 21, 1986
4618228 Bifocal contact lens of the bivisual type Oct. 21, 1986
4614413 Contact lens Sep. 30, 1986
4593981 Bifocal contact lens Jun. 10, 1986
4580882 Continuously variable contact lens Apr. 8, 1986
4573775 Bifocal contact lens Mar. 4, 1986
4573774 Soft toric contact lens Mar. 4, 1986
4564484 Production of soft lenses having reduced spherical aberrations Jan. 14, 1986
4549794 Hydrophilic bifocal contact lens Oct. 29, 1985
4525043 Contact lens Jun. 25, 1985
4512040 Bifocal intraocular lens Apr. 23, 1985
4508436 Soft toric contact lens Apr. 2, 1985
4477158 Lens system for variable refraction Oct. 16, 1984

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