Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Reexamination Certificate
2006-06-22
2010-06-08
Martinez, Joseph (Department: 2873)
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
C351S159000
Reexamination Certificate
active
07731357
ABSTRACT:
There is provided a group of bi-aspherical type progressive-power lenses for which the processing costs are reduced. In a bi-aspherical type progressive-power lens(es), the relationships DHf+DHn<DVf+DVn and DHn<DVn or further, DVn−DVf>ADD/2 and DHn−DHf<ADD/2 are satisfied; DHf and DVf are designated respectively as a surface refractive power in a horizontal direction and a surface refractive power in a vertical direction at a far vision power measurement position F1on a first refractive surface that acts as an object-side surface; with DHn and DVn are designated respectively as a surface refractive power in a horizontal direction and a surface refractive power in a vertical direction at a near vision power measurement position N1on the first refractive surface; a surface astigmatism component at F1and N1of the first refractive surface is canceled by a second refractive surface of the eye-side surface; and the first and second refractive surfaces are combined to provide a far vision power (Df) and an addition (ADD) on the basis of a prescription; wherein the same first refractive surface is used for at least two or more kinds of different addition power.
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Hatanaka Takashi
Kikuchi Yoshihiro
Kitani Akira
Greece James R
Hoya Corporation
Martinez Joseph
Oliff & Berridg,e PLC
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