Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Reexamination Certificate
2000-12-04
2003-10-28
Sugarman, Scott J. (Department: 2873)
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
C351S159000, C351S168000, C351S169000, C351S176000
Reexamination Certificate
active
06637880
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a spectacle lens, which is designed and manufactured taking into consideration the distance between the center of rotation of the eye and a spectacle lens of an individual spectacles wearer, and a manufacturing method therefor.
2. Description of the Related Art
Despite the fact that spectacle lenses comprises single vision lenses and multifocal lenses (including progressive-power lenses) with different optical characteristics, they are generally designed on the basis of certain average utilization conditions. An example in which individual utilization conditions are taken into consideration is the method disclosed in Japanese Patent Application Laid-open No. 6-18823, in which there is proposed a progressive-power lens designed in consideration of individual utilization conditions, and there is disclosed the use of an aspheric surface, which is not accompanied by point symmetry axial symmetry in a prescription surface. The term “utilization conditions” as used here refers to the distance between the back surface of a spectacle lens (the surface of the eye side) and the vertex of the cornea, the tilt of the frame, and so forth, and an attempt is made to optimize a prescription surface by using these data in lens design.
However, the technique disclosed in the above-mentioned publication has an object to optimize a progressive-power lens comprising a distance portion, a near portion, and an intermediate portion, and having a prescription surface for both far and near vision use, and in particular, takes into consideration the importance of utilization conditions in the case of a spectacle lens, like a progressive-power lens, having a prescription, which supplements the accommodative power in near vision for presbyopia. This is because a progressive-power lens requires particularly accurate adjustment of s determining the conditions of a corrective prescription, is deemed particularly necessary. Therefore, the disclosure in the publication only emphasizes the accurateness of a near use prescription, and does not address overall wearing conditions for lenses such as spherical design lenses, aspherical single vision lenses, and bifocal lenses.
The present invention was devised based on the above-mentioned circumstances, and has as an object to provide a spectacle lens and a manufacturing method thereof, having a prescription surface which has been further optimized by reviewing the wearing conditions for all spectacle lenses, which was not paid much attention to in the past, and by taking into consideration individual wearing conditions.
SUMMARY OF THE INVENTION
As a means for solving the above-mentioned problems, a first invention is a spectacle lens characterized in that a spectacle lens is designed by using a value determined by either measuring or specifying for an individual spectacles wearer the value of the distance VR from a reference point on the back surface of a spectacle lens to the center of rotation of the eye, which adds together the value of the distance VC from a reference point of the back surface of a spectacle lens to the vertex of the cornea of the eye of the spectacles wearer at spectacle lenses wearing time, which is one of the required data in spectacle lens design, and the distance CR from the above-mentioned vertex of the cornea to the center of rotation of the eye, and manufacturing a spectacle lens based on this design specification.
A second invention is a spectacle lens related to the first invention, characterized in that the value of the distance CR from the above-mentioned vertex of the cornea to the center of rotation of the eye utilizes a value obtained based on measurement data obtained by measuring the axial length of the eye CO of a spectacles wearer.
A third invention is a spectacle lens related to either the first invention or the second invention, characterized in that the above-mentioned center of rotation of the eye is determined for distance vision, near vision, specified distance vision, and combination thereof, respectively, and is either selected and used on the basis of lens optical characteristics, or is used for appropriate viewing areas of a spectacle lens, respectively.
A fourth invention is a spectacle lens characterized in that it is processed by obtaining an optimized lens form based on an optical model of wearing conditions simulated in accordance with design and/or processing condition data information selected as needed from among information comprising a prescription value, which comprises spectacle lens information, spectacle frame information, and data related to the individual VR value of a spectacles wearer, layout information, and process specification information.
A fifth invention is a spectacle lens related to the fourth invention, characterized in that an amount of inset for near vision is determined based on the above-mentioned VR value.
A sixth invention is a spectacle lens related to the fourth invention, characterized in that the base curve of a convex surface is determined based on the above-mentioned VR value.
A seventh invention is a spectacle lens related to the fourth invention, characterized in that power error correction for a pre-set reference prescription surface is performed based on the above-mentioned VR value.
An eighth invention is a spectacle lens manufacturing method, wherein a terminal apparatus, which is installed at a spectacle lens ordering party, and an information processing system, which is installed at a spectacle lens processing party, and is connected by a telecommunications line to the above-mentioned terminal apparatus are provided for designing and manufacturing a spectacle lens based on information sent to the above-mentioned information processing system via the above-mentioned ordering party terminal apparatus; this spectacle lens manufacturing method comprising the steps of:
sending to the above-mentioned information processing system via the above-mentioned terminal apparatus design and/or processing condition data information selected as needed from among information comprising a prescription value, which comprises spectacle lens information, spectacle frame information, and data related to the VR value of each spectacles wearer, layout information, and process specification information; and
obtaining an optimized lens form based on an optical model of wearing conditions simulated by the above-mentioned information processing system, determining processing conditions, and manufacturing a spectacle lens.
A ninth invention is a spectacle lens manufacturing method, wherein, a terminal apparatus, which is installed at a spectacle lens ordering party, and an information processing system, which is installed at a spectacle lens processing party, and is connected by a telecommunications line to the above-mentioned terminal apparatus are provided for designing and manufacturing a spectacle lens based on information sent to the above-mentioned information processing system via the above-mentioned ordering party terminal apparatus, this spectacle lens manufacturing method comprising the steps of:
sending to the above-mentioned information processing system via the above-mentioned terminal apparatus design and/or processing condition data information selected as needed from among information comprising a prescription value, which comprises spectacle lens information, spectacle frame information, and data related to the VR value of each spectacles wearer, layout information, and process specification information:
determining an optimized lens form based on an optical model of wearing conditions simulated by the above-mentioned information processing system;
also determining a standardized lens form by the above-mentioned information processing system using a standardized VR value in place of said VR value obtained for each spectacles wearer, while using other design and/or processing condition data sent via the above-mentioned terminal,
comparing the optical characteristics of the above-mentioned optimi
Hatanaka Takashi
Yamakaji Tetsuma
Hoya Corporation
Oliff & Berridg,e PLC
Sugarman Scott J.
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