Spectacle Lens
First Claim
1. A spectacle lens, intended for use in a spectacle frame with a camber angle of 200°
- or more, comprising;
cylindrical power, offsetting an aberration due to a camber angle, provided at a design reference point of a refractive surface of the spectacle lens, the refractive surface being at least one of an object side and an eye side of the spectacle lens;
prismatic power, offsetting prismatic effect due to a camber angle, provided at the design reference point; and
a nose side aspherical surface provided on a nose side of the spectacle lens and an ear side aspherical surface being on an ear side of the spectacle lens, the nose side and the ear side aspherical surfaces having respectively different manners of curvature change.
2 Assignments
0 Petitions
Accused Products
Abstract
To provide a spectacle lens that is designed optically to suit a spectacle frame with a large camber angle such as a wraparound type spectacle frame. A spectacle lens that is mounted in a spectacle frame with a camber angle of 200° or more, in which cylindrical power for offsetting astigmatic aberration, which is caused by the camber angle at a design reference point, is added to a refractive surface on an object side or a refractive surface on an eye side, prismatic power for offsetting prismatic effect, which is caused by the camber angle at the design reference point, is added to the refractive surface on the object side or the refractive surface on the eye side, and aspherical surfaces different from each other on a nose side and an ear side are formed on the refractive surface on the object side or the refractive surface on the eye side.
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Citations
18 Claims
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1. A spectacle lens, intended for use in a spectacle frame with a camber angle of 200°
- or more, comprising;
cylindrical power, offsetting an aberration due to a camber angle, provided at a design reference point of a refractive surface of the spectacle lens, the refractive surface being at least one of an object side and an eye side of the spectacle lens;
prismatic power, offsetting prismatic effect due to a camber angle, provided at the design reference point; and
a nose side aspherical surface provided on a nose side of the spectacle lens and an ear side aspherical surface being on an ear side of the spectacle lens, the nose side and the ear side aspherical surfaces having respectively different manners of curvature change. - View Dependent Claims (2, 3, 4)
- or more, comprising;
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5. A spectacle lens design method, comprising:
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determining a frame camber angle and a design reference point on a refractive surface of the spectacle lens;
adding to the refractive surface one or more of;
cylindrical power offsetting an aberration due to a camber angle, based on the frame camber angle, and prismatic power offsetting a camber angle prismatic effect, based on the frame camber angle; and
providing on a nose side and on an ear side of the spectacle lens respective aspherical surfaces having respectively different manners of curvature change. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. Spectacles, comprising:
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a frame having a camber angle of 200°
or more; and
a spectacle lens, disposed in the frame, having a respective nose side and a respective ear side, the spectacle lens comprising;
cylindrical power, offsetting an astigmatic aberration due to the camber angle, provided at a design reference point of a refractive surface of the spectacle lens, the refractive surface being at least one of an object side and an eye side of the spectacle lens;
prismatic power, offsetting a prismatic effect due to the camber angle, provided at the design reference point; and
a nose side aspherical surface provided on the nose side of the spectacle lens and an ear side aspherical surface being on the ear side of the spectacle lens, the nose side and the ear side aspherical surfaces having respectively different manners of curvature change. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification