Progressive ophthalmic lens

Patent metadata

Field	Value
Publication number	US-9454019-B2
Application number	US-201214007721-A
Country	US
Kind code	B2
Filing date	Mar 22, 2012
Priority date	Mar 31, 2011
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

Disclosed is a progressive ophthalmic lens including a front surface and a rear surface, each surface having in each point an altitude, a mean sphere value and a cylinder value, the front surface of the lens including: —a far vision zone having a far vision reference point; —a near vision zone having a near vision reference point; —a main meridian, wherein the front surface is regressive and has: —a sphere gradient normalized value of less than 7.50·10 −1 mm −1 at any point in a central portion of the lens including a portion of the main meridian ( 32 ), the far vision reference point (FV) and the near vision reference point (NV); —a cylinder gradient normalized value of less than 1.45 mm −1 at any point in the central portion of the lens.

First claim

The invention claimed is:

1. A progressive ophthalmic lens comprising:
a front surface and a rear surface, each surface having in each point an altitude, a mean sphere value, and a cylinder value,
the front surface of the lens comprising:
a far vision zone having a far vision reference point,
a near vision zone having a near vision reference point, and
a main meridian,

wherein the front surface is a regressive surface which is a continuous aspheric surface having a zone of decreasing mean sphere value connecting the far vision zone and the near vision zone and has:
a sphere gradient normalized value of less than 7.50·10 −1 mm −1 at any point in a central portion of the lens including a portion of the main meridian, the far vision reference point, and the near vision reference point, and
a cylinder gradient normalized value of less than 1.45 mm −1 at any point in the central portion of the lens.

2. The progressive ophthalmic lens according to claim 1 , wherein at least one surface comprises two micro-markings and a central point located at the center of a segment linking the two micro-markings, and
wherein the central portion of the lens is a circle of 40 mm diameter centered on the central point.

3. A semi-finished spectacle lens blank comprising:
a first regressive surface which is a continuous aspheric surface having a zone of decreasing mean sphere value connecting the far vision zone and the near vision zone, and a second unfinished surface,
the first regressive surface having in each point an altitude, a mean sphere value, and a cylinder value,
the first regressive surface comprising:
a far vision zone having a far vision reference point,
a near vision zone having a near vision reference point, and
a main meridian,

wherein the first regressive surface has a fourth derivative with respect to altitude normalized value of less than 5.0·10 −5 mm −2 ·diopter −1 at any point in at least a central portion of the blank including a portion of the main meridian, the far vision reference point, and the near vision reference point, and
wherein the first regressive surface has:
a sphere gradient normalized value of less than 7.50·10 −1 mm −1 at any point in the central portion, and
a cylinder gradient normalized value of less than 1.45 mm −1 at any point in the central portion.

4. The semi-finished spectacle lens blank of claim 3 , further comprising markings defining a position of a central point of the blank,
wherein the central portion of the blank is a circle of 40 mm diameter centered on the central point.

5. A method for manufacturing a progressive ophthalmic lens, comprising:
providing data relative to a wearer;
selecting a semi-finished lens blank according to claim 4 ;
carrying out an optical optimization of the lens based on the data relative to the wearer and on data relative to the first regressive surface of the blank; and
providing the selected semi-finished lens blank and surfacing or molding the unfinished surface of the blank according to the result of the optical optimization.

6. A method for manufacturing a progressive ophthalmic lens, the method comprising:
providing data relative to a wearer;
selecting a semi-finished lens blank according to claim 3 ;
carrying out an optical optimization of the lens based on the data relative to the wearer and on data relative to the first regressive surface of the blank; and
providing the selected semi-finished lens blank and surfacing or molding the unfinished surface of the blank according to the result of the optical optimization.

7. A set of apparatuses for manufacturing a progressive ophthalmic lens and/or a semi-finished lens blank, wherein the apparatuses are configured to execute the method according to claim 6 .

8. A computer program product comprising one or more stored sequence of instruction that is accessible to a processor and which, when executed by the processor, causes the processor to execute the method of claim 6 .

9. A semi-finished spectacle lens blank comprising:
a first regressive surface which is a continuous aspheric surface having a zone of decreasing mean sphere value connecting the far vision zone and the near vision zone, and a second unfinished surface,
the first regressive surface having in each point an altitude, a mean sphere value, and a cylinder value,
the first regressive surface comprising:
a far vision zone having a far vision reference point,
a near vision zone having a near vision reference point, and
a main meridian,

wherein the first regressive surface has:
a sphere gradient normalized value of less than 7.50·10 −1 mm −1 at any point in a central portion of the blank including a portion of the main meridian, the far vision reference point, and the near vision reference point, and
a cylinder gradient normalized value of less than 1.45 mm −1 at any point in the central portion.

10. The semi-finished spectacle lens blank of claim 9 , further comprising markings defining a position of a central point of the blank,
wherein the central portion of the blank is a circle of 40 mm diameter centered on the central point.

11. A method for manufacturing a progressive ophthalmic lens, the method comprising:
providing data relative to a wearer;
selecting a semi-finished lens blank according to claim 9 ;
carrying out an optical optimization of the lens based on the data relative to the wearer and on data relative to the first regressive surface of the blank; and
providing the selected semi-finished lens blank and surfacing or molding the unfinished surface of the blank according to the result of the optical optimization.

12. A method for manufacturing semi-finished lens blank, the method comprising:
defining a first surface and a second unfinished surface, the first surface having in each point an altitude, a mean sphere value, and a cylinder value;
defining a far vision zone having a far vision reference point, a near vision zone having a near vision reference point, a main meridian, and a central portion of the first surface including a portion of the main meridian, the far vision reference point, and the near vision reference point;
determining the first surface being a first regressive surface which is a continuous aspheric surface having a zone of decreasing mean sphere value connecting the far vision zone and the near vision zone and having:
a regression of the mean sphere value between at least a portion of the far vision zone and at least a portion of the near visions zone,
a sphere gradient normalized value of less than 7.50·10 −1 mm −1 at any point in the central portion, and
a cylinder gradient normalized value of less than 1.45 mm −1 at any point in the central portion; and

surfacing or molding the first surface.

13. A set of apparatuses for manufacturing a progressive ophthalmic lens and/or a semi-finished lens blank, wherein the apparatuses are configured to execute the method according to claim 12 .

14. A computer program product comprising one or more stored sequence, of instruction that is accessible to a processor and which, when executed by the processor, causes the processor to execute the method of claim 12 .

15. A non-transitory computer readable medium carrying out one or more sequences of instructions of the computer program product of claim 14 .

16. A method for manufacturing a progressive ophthalmic lens, comprising:
providing data relative to a wearer;
defining far vision zone having a far vision reference point, a near vision zone having a near vision reference point, and a main meridian;
defining

Assignees

• De Rossi Helene
• Moine Jerome
• Rego Carlos
• Guillot Matthieu
• Essilor Int

Inventors

• De Rossi Helene
• Moine Jerome
• Rego Carlos
• Guillot Matthieu

Classifications

• G02C7/063

  Shape of the progressive surface · CPC title

• G02C7/06

  bifocal; multifocal {; progressive (G02C7/041 takes precedence)} · CPC title

• G02C7/061 Primary

  Spectacle lenses with progressively varying focal power · CPC title

• G02C7/068

  Special properties achieved by the combination of the front and back surfaces · CPC title

• G02C7/027

  considering wearer's parameters · CPC title