Method of locally thickening an ophthalmic lens

Patent metadata

Field	Value
Publication number	US-10247961-B2
Application number	US-201414785810-A
Country	US
Kind code	B2
Filing date	Apr 16, 2014
Priority date	Apr 29, 2013
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

Method implemented by computer means for determining an ophthalmic lens adapted to a wearer and to a spectacle frame, the method comprising: providing wearer data comprising the wearer's ophthalmic prescription, providing mounting data comprising at least the tie points of the ophthalmic lens to be mounted in the spectacle frame, providing thickness requirement data comprising the minimum thickness of the ophthalmic lens at the tie points, determining ophthalmic lens data based on the wearer data, the ophthalmic lens data comprising the two optical surfaces of the ophthalmic lens and their relative positions, an oversize creating step (S5), during which the ophthalmic lens determined during the ophthalmic lens data determining step is locally thickened by creating an oversize at the tie points, so that the thickness of the ophthalmic lens at the tie points is greater than or equal to the minimum thickness.

First claim

The invention claimed is:

1. A method implemented by processing circuitry for determining an ophthalmic lens adapted to a wearer and to a spectacle frame, the method comprising:
a wearer data obtaining step performed by the processing circuitry, during which wearer data comprising at least the wearer's ophthalmic prescription is obtained;
a mounting data obtaining step performed by the processing circuitry, during which mounting data is obtained, the mounting data comprising at least tie points of the ophthalmic lens to be mounted in the spectacle frame;
a thickness requirement data obtaining step performed by the processing circuitry, during which thickness requirement data is obtained, the thickness requirement data comprising minimum thickness of the ophthalmic lens at the tie points so as to be mounted in the spectacle frame;
an ophthalmic lens data determining step performed by the processing circuitry, during which ophthalmic lens data is determined based on the wearer data, the ophthalmic lens data comprising at least two optical surfaces of the ophthalmic lens and relative positions of the two optical surfaces of the ophthalmic lens; and
an oversize creating step performed by the processing circuitry, during which the ophthalmic lens determined during the ophthalmic lens data determining step is locally thickened by creating an oversize at the tie points, the oversize being determined so that the thickness of the ophthalmic lens at the tie points is greater than or equal to the minimum thickness, wherein
during the oversize creating step, for each tie point the ophthalmic lens is thickened on a front surface or on a back surface over a zone around the tie point, each zone extending on the corresponding surface over a radius greater than or equal to 2 mm and smaller than or equal to 5 mm around the tie point.

2. The method according to claim 1 , wherein the ophthalmic lens is a positive ophthalmic lens.

3. The method according to claim 1 wherein during the oversize creating step the oversize is applied on the back surface of the ophthalmic lens.

4. The method according to claim 1 , wherein during the oversize creating step the oversize is shared between the front surface and the back surface of the ophthalmic lens.

5. The method according to claim 1 , wherein the spectacle frame is a rim frame and the mounting data comprises a rim shape.

6. The method according to claim 5 , wherein the tie points are part of a bevel to be edged to the ophthalmic lens so as to be mounted in the spectacle frame.

7. The method according to claim 1 , wherein the spectacle frame is a rimless frame and the mounting data comprises mounting points of the spectacle frame.

8. The method according to claim 7 , wherein the tie points correspond to drilling points of the ophthalmic lens to be mounted in the spectacle frame.

9. The method according to claim 1 , wherein the oversize is determined so that the thickness of the ophthalmic lens at the tie points after the oversize creating step is greater than or equal to 1 mm.

10. A computer program product comprising one or more stored sequences of instructions that are stored on a non-transitory memory and that accessible to a processor and which, when executed by the processor, causes the processor to perform a method, the method comprising:
obtaining wearer data comprising at least wearer's ophthalmic prescription;
obtaining mounting data, the mounting data comprising at least tie points of an ophthalmic lens to be mounted in a spectacle frame;
obtaining thickness requirement data, the thickness requirement data comprising a minimum thickness of the ophthalmic lens at the tie points so as to be mounted in the spectacle frame;
determining ophthalmic lens data based on the wearer data, the ophthalmic lens data comprising at least two optical surfaces of the ophthalmic lens and relative positions of the two optical surfaces of the ophthalmic lens; and
locally thickening the ophthalmic lens determined during the determining by creating an oversize at the tie points, the oversize being determined so that thickness of the ophthalmic lens at the tie points is greater than or equal to the minimum thickness, wherein
during the locally thickening, for each tie point the ophthalmic lens is thickened on a front surface or on a back surface over a zone around the tie point, each zone extending on the corresponding surface over a radius greater than or equal to 2 mm and smaller than or equal to 5 mm around the tie point.

Assignees

• Essilor Int

Inventors

• Moine Jérôme
• Sahler Jean

Classifications

• G02C7/027 Primary

  considering wearer's parameters · CPC title

• B29D11/00961

  using microprocessors or computers · CPC title

• G02C1/02

  Bridge or browbar secured to lenses without the use of rims · CPC title

• G02C7/024 Primary

  Methods of designing ophthalmic lenses · CPC title

• G02C1/06

  Bridge or browbar secured to or integral with closed rigid rims for the lenses · CPC title