Progressive multifocal lens and manufacturing method of eyeglass lens and progressive multifocal lens
DCFirst Claim
1. A progressive multifocal lens capable of correcting a user'"'"'s vision and having a first major surface and a second major surface, where the first major surface is positioned closest to the user'"'"'s eye when the progressive multifocal lens is worn by the user, the progressive multifocal lens comprising:
- a distance-vision region having a first refractive power;
a near-vision region having a second refractive power; and
a progressive region joining the distance-vision region and the near-vision region and having a refractive power that varies gradually;
wherein the first major surface is a composite surface that comprises a progressive refractive surface comprising the distance-vision region, near-vision region, and progressive region; and
wherein the first major surface includes a surface that corrects astigmatism.
3 Assignments
Litigations
2 Petitions
Reexamination
Accused Products
Abstract
A progressive multifocal lens used for correction of vision includes a progressive refractive surface positioned closest to the user'"'"'s eye when the lens is worn by the user, and a second surface on an object side of the lens. Because the base curve of the second surface can be a constant spherical surface, it is possible to prevent variations in magnification due to shape factors. In addition, differences in magnification between a distance-vision region and a near-vision region of the progressive multifocal lens are reduced, and variations in the magnification of a progressive refractive region in the progressive multifocal lens can be suppressed. Accordingly, image jumping and warping due to differences in magnification are reduced, resulting in a comfortable visual field for the user. A progressive multifocal lens for correction of astigmatism includes a progressive refractive surface and a toric surface that are combined to form a composite surface positioned closest to the user'"'"'s eye when the lens is worn by the user.
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Citations
20 Claims
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1. A progressive multifocal lens capable of correcting a user'"'"'s vision and having a first major surface and a second major surface, where the first major surface is positioned closest to the user'"'"'s eye when the progressive multifocal lens is worn by the user, the progressive multifocal lens comprising:
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a distance-vision region having a first refractive power; a near-vision region having a second refractive power; and a progressive region joining the distance-vision region and the near-vision region and having a refractive power that varies gradually; wherein the first major surface is a composite surface that comprises a progressive refractive surface comprising the distance-vision region, near-vision region, and progressive region; and wherein the first major surface includes a surface that corrects astigmatism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of manufacturing a progressive multifocal lens capable of correcting a user'"'"'s vision and having a first major surface and a second major surface, where the first major surface is positioned closest to the user'"'"'s eye when the progressive multifocal lens is worn by the user, the progressive multifocal lens having a distance-vision region having a first refractive power, a near-vision region having a second refractive power, and a progressive region joining the distance-vision region and the near-vision region and having a refractive power that varies, the method comprising:
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determining parameters of an original progressive refractive surface capable of correcting the user'"'"'s vision; determining parameters of an original toric surface capable of correcting astigmatism; and determining parameters of the first major surface of the progressive multifocal lens from the parameters of the original progressive refractive surface and the parameters of the original toric surface. - View Dependent Claims (18, 19, 20)
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Specification