Spectacle lens, manufacturing method thereof and lens supply system

Patent metadata

Field	Value
Publication number	US-9753307-B2
Application number	US-201414777136-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Mar 15, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A lens supply system has: an initial shape data obtaining unit that obtains initial shape data of a spectacle lens; a shape data correcting unit that corrects the initial shape data such that, when a base curve of an initial lens manufactured based on the initial shape data is defined as a first base curve, a predetermined lens having a second base curve lower than the first base curve is defined as a target spectacle lens, prismatic effects which light rays in respective visual line directions passing through a center of an eye assumed in optical design receive from the initial lens coincide with or approach prismatic effects which the light rays receive from the target spectacle lens; and a spectacle lens manufacturing unit that manufactures a spectacle lens based on the corrected initial shape data.

First claim

What is claimed is:

1. A lens supply system, comprising:
an initial shape data obtaining unit configured to obtain initial shape data of a spectacle lens;
a shape data correcting unit configured to correct the initial shape data such that, when a base curve of an initial lens manufactured based on the initial shape data is defined as a first base curve, a predetermined lens having a second base curve lower than the first base curve is defined as a target spectacle lens, prismatic effect distribution which light rays in respective visual line directions passing through a center of an eye assumed in optical design receive from the initial lens coincide with or approach prismatic effect distribution which the light rays receive from the target spectacle lens, while maintaining the first base curve before and after correction; and
a spectacle lens manufacturing unit configured to manufacture a spectacle lens based on the corrected initial shape data,
wherein the shape data correcting unit calculates a shift amount between the prismatic effect distribution which the light rays receive from the initial lens and the prismatic effect distribution which the light rays receive from the target spectacle lens, and corrects at least one of a convex surface and a concave surface of the initial lens such that the calculated shift amount in a peripheral region of the initial lens falls within a predetermined tolerance.

2. The lens supply system according to claim 1 ,
further comprising:
a shape measuring unit configured to measure a shape of an ordinary spectacle lens which is defined as a spectacle lens which a wearer scheduled to wear the manufactured spectacle lens usually wears; and
an ordinary spectacle lens data generating unit configured to generate shape data of the ordinary spectacle lens based on a result of the measuring,
wherein the shape data correcting unit corrects the initial shape data based on the shape data of the ordinary spectacle lens such that the prismatic effect distribution which the light rays in respective visual line directions passing through the center of the eye assumed in optical design receive from the initial lens coincide with or approach prismatic effect distribution which the light rays receive from the ordinary spectacle lens, while maintaining the first base curve before and after correction.

3. The lens supply system according to claim 2 , further comprising an inputting unit configured to input a value of a base curve of the ordinary spectacle lens measured by the shape measuring unit.

4. The lens supply system according to claim 1 , further comprising a sample selecting unit configured to select a sample lens from a plurality of types of predetermined sample lenses,
wherein the shape data correcting unit corrects the initial shape data based on shape data of the sample lens selected by the sample selecting unit such that the prismatic effect distribution which the light rays in respective visual line directions passing through the center of the eye assumed in optical design receive from the initial lens coincide with or approach prismatic effect distribution which the light rays receive from the sample lens selected by the sample selecting unit, while maintaining the first base curve before and after correction.

5. The lens supply system according to claim 1 , wherein the center of the eye is an eyeball rotation center or a center of an entrance pupil of the eye in a state of frontward viewing.

6. A lens supply system, comprising:
an initial shape data obtaining unit configured to obtain initial shape data of a spectacle lens; and
a shape data correcting unit configured to correct the initial shape data such that prismatic effect distribution which light rays in respective visual line directions passing through a center of an eye assumed in optical design receive from an initial lens manufactured based on the initial shape data coincide with or approach a state of a naked eye not having prismatic effect distribution, while maintaining a base curve before and after correction,
wherein the shape data correcting unit calculates a shift amount between the prismatic effect distribution which the light rays receive from the initial lens and a state where the light rays do not receive prismatic effect distribution, and corrects at least one of a convex surface and a concave surface of the initial lens such that the calculated shift amount in a peripheral region of the initial lens falls within a predetermined tolerance.

7. A spectacle lens having a shape formed based on correction data obtained by correcting initial shape data, wherein the initial shape data is corrected, while placing importance on dioptric power in comparison to prism in a lens center region and placing importance on prism in comparison to dioptric power in a lens peripheral region, such that, when a base curve of an initial lens manufactured based on the initial shape data is defined as a first base curve, a predetermined lens having a second base curve lower than the first base curve is defined as a target spectacle lens, prismatic effect distribution which light rays in respective visual line directions passing through a center of an eye assumed in optical design receive from the initial lens coincide with or approach prismatic effect distribution which the light rays receive from the target spectacle lens, and such that a shift amount in a peripheral region of the initial lens between the prismatic effect distribution which the light rays receive from the initial lens and the prismatic effect distribution which the light rays receive from the target spectacle lens falls within a predetermined tolerance.

8. The spectacle lens according to claim 7 ,
wherein the spectacle lens has the shape formed based on the correction data obtained by correcting the initial shape data while placing importance on dioptric power in comparison to prism in a lens center region and placing importance on prism in comparison to dioptric power in a lens peripheral region, such that the prismatic effect distribution which the light rays in respective visual line directions passing through the center of the eye assumed in optical design receive from the initial lens coincide with or approach prismatic effect distribution which the light rays receive from an ordinary spectacle lens which is defined as a lens which a wearer scheduled to wear the spectacle lens usually wears.

9. A spectacle lens having a shape formed based correction data obtained by correcting initial shape data, wherein the initial shape data is corrected while placing importance on dioptric power in comparison to prism in a lens center region and placing importance on prism in comparison to dioptric power in a lens peripheral region, such that prismatic effect distribution which light rays in respective visual line directions passing through a center of an eye assumed in optical design receive from an initial lens manufactured based on the initial shape data coincide with or approach a state of a naked eye not having prismatic effect distribution, and such that a shift amount in a peripheral region of the initial lens between the prismatic effect distribution which the light rays receive from the initial lens and a state where the light rays do not receive prismatic effect distribution falls within a predetermined tolerance.

10. A manufacturing method for a spectacle lens, comprising:
obtaining initial shape data of a spectacle lens;
correcting the initial shape data such that, when a base curve of an initial lens manufactured based on the initial shape data is defined as a first base curve, a predetermined lens having a second base curve lower than the first base curve is defined as a t

Assignees

• Hoya Corp

Inventors

• Kozu Kazuma
• Hatanaka Takashi

Classifications

• G02C7/027

  considering wearer's parameters · CPC title

• G02C7/024 Primary

  Methods of designing ophthalmic lenses · CPC title

• G05B19/4097

  characterised by using design data to control NC machines, e.g. CAD/CAM (G05B19/4093 takes precedence) · CPC title

• G02C7/022

  Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence) · CPC title

• G02C7/02 Primary

  Lenses; Lens systems {; Methods of designing lenses} · CPC title