SPECTACLE LENS

• US 20140055742A1
• Filed: 02/20/2012
• Published: 02/27/2014
• Est. Priority Date: 02/23/2011
• Status: Active Grant

• Current Assignee: Hoya Lens Manufacturing Philippines, Inc. (Hoya Corporation)
• Original Assignee: Hoya Lens Manufacturing Philippines, Inc. (Hoya Corporation)
• Inventors: Shinohara, Toshihide, Mori, Takateru
• Granted Patent: US 9,010,932 B2
• Time in Patent Office: Days
• US Class Current: 351/159.42
• CPC Class Codes: G02C 7/061 Spectacle lenses with progressively varying focal power
• CPC Class Codes: G02C 7/063 Shape of the progressive surface
• CPC Class Codes: G02C 7/068 Special properties achieved by the combination of the front and back surfaces

Abstract

A progressive power lens 10 for spectacles has a distance portion 11 and a near portion 12 of different powers. A surface power OMHP in a horizontal direction on an object-side surface along a principal meridian 14 or a vertical reference line passing through a fitting point Pe, a surface power OMVP(y) in a vertical direction of the object-side surface, the absolute value IMHP of a surface power on an eye-side surface, and the absolute value IMVP of a surface power in a vertical direction on the eye-side surface satisfy the following condition. OMHP(y)>OMVP(y) IMHP(y)>IMVP(y) OMHP(y)−OMVP(y)=IMHP(y)−IMVP(y) In the conditions, y is a coordinate along the principal meridian or the vertical reference line.

Claims

1. A progressive power lens for spectacles that has a distance portion and a near portion of different powers,

wherein a surface power OMHP(y) in a horizontal direction on an object-side surface along a principal meridian or a vertical reference line passing through a fitting point, a surface power OMVP(y) in a vertical direction on the object-side surface, the absolute value IMHP(y) of a surface power in a horizontal direction on an eye-side surface, and the absolute value IMVP(y) of a surface power in a vertical direction on the eye-side surface satisfy the following conditions:

OMHP(y)>

OMVP(y)

IMHP(y)>

IMVP(y)

OMHP(y)−

OMVP(y)=IMHP(y)−

IMVP(y)

where a prescription for astigmatism is not included, and y is a coordinate along the principal meridian or the vertical reference line.

2. The progressive power lens according to claim 1,

wherein the following condition is further satisfied:

OMHP(y)−

OMVP(y)=IMHP(y)−

IMVP(y)=C0

where, CO is a constant.

3. The progressive power lens according to claim 2,

wherein the eye-side surface is a progressive surface.

4. The progressive power lens according to claim 2,

wherein a surface power OHP(y) in the horizontal direction on the object-side surface within a range of ±

10 mm with the principal meridian or the vertical reference line interposed, a surface power OVP(y) in the vertical direction on the object-side surface, the absolute value IHP(y) of a surface power in the horizontal direction on the eye-side surface, and the absolute value IVP(y) of a surface power in the vertical direction on the eye-side surface satisfy the following conditions;

OHP(x,y)>

OVP(x,y)

IHP(x,y)>

IVP(x,y)

OHP(x,y)−

OVP(x,y)=IHP(x,y)−

IVP(x,y)=C0

where, x is the coordinate of a horizontal reference line passing through the fitting point.

5. The progressive power lens according to claim 4,

wherein the following conditions are further satisfied within a range of ±

10 mm with the principal meridian or the vertical reference line interposed;

OHP(x,y)=C1

OVP(x,y)=C2

where, CI and C2 are constants.

6. A progressive power lens for spectacles that has a distance portion and a near portion of different powers,

wherein an object-side surface or an eye-side surface includes elements of a toric surface with a curvature in a lateral direction greater than a curvature in a longitudinal direction along at least a principal meridian or a vertical reference line passing through a fitting point, and

the object-side surface and the eye-side surface include elements of a toric surface which cancel shifts in the surface power by the elements of the tonic surface.

7. The progressive power lens according to claim 6,

wherein the object-side surface is a tonic surface

8. A progressive power lens for spectacles that has a distance portion and a near portion of different powers,

wherein, when a surface power in a horizontal direction of the distance portion on an object-side surface along a principal meridian or a vertical reference line passing through a fitting point is OHPf, a surface power in a vertical direction is OVPf, a surface power in a horizontal direction of the near portion is OHPn, and a surface power in a vertical direction is OVPn,

the object-side surface includes elements of a tonic surface with the surface power OHPf in the horizontal direction of the distance portion greater than the surface power OVPf in the vertical direction of the distance portion, and

an eye-side surface along the principal meridian or the vertical reference line includes elements that cancel shifts in the surface power by the elements of the tonic surface on the object-side surface, and satisfy the following conditions:

OHPf+OHPn>

OVPf+OVPn

OVPn>

OVPf.

9. The progressive power lens according to claim 8,

wherein a surface power IHPf in a horizontal direction and a surface power IVPf in a vertical direction of the distance portion on the eye-side surface along the principal meridian or the vertical reference line, and a surface power IHPn in a horizontal direction and a surface power IVPn in a vertical direction of the near portion satisfy the following conditions:

OHPf−

OVPf=IHPf−

IVPf

OHPn−

OVPn=IHPn−

IVPn

where, a prescription for astigmatism is not included, the surface powers IHPf, IVPf, IHPn, and IVPn are absolute values.

10. The progressive power lens according to claim 9,

wherein a surface power IHPf in a horizontal direction and a surface power IVPf in a vertical direction of the distance portion on the eye-side surface along the principal meridian or the vertical reference line, and a surface power IHPn in a horizontal direction and a surface power IVPn in a vertical direction of the near portion satisfy the following conditions:

IHPf−

IVPf=OHPf/(1−

t/n*OHPf)−

OVPf/(1−

t/n*OVPf)

IHPn−

IVPn=HPn/(1−

t/n*OHPn)−

OVPn/(1−

t/n*OVPn)

where, t is the thickness (unit meter) of the progressive power lens, n is the refractive index of a base material of the progressive power lens, the surface powers IHPf, IVPf, IHPn, and IVPn are absolute values, and a prescription for astigmatism is not included.

11. The progressive power lens according to claim 10,

wherein the following condition is further satisfied. OHPn>

OVPn

12. The progressive power lens according to claim 11,

wherein the following conditions are further satisfied:

IHPf>

IVPf

IHPn>

IVPn

IHPf>

IHPn.

13. The progressive power lens according to claim 12,

wherein the following conditions are further satisfied:

OHPf=OHPn

IVPf=IVPn.

14. The progressive power lens according to claim 10,

wherein the conditions are satisfied within a range of at least ±

10 mm with the principal meridian or the vertical reference line interposed.

15. A progressive power lens for spectacles that has a distance portion and a near portion of different powers,

wherein, when a surface power in a horizontal direction of the distance portion on an object-side surface along a principal meridian or a vertical reference line passing through a fitting point is OHPf, a surface power in a vertical direction is OVPf, a surface power in a horizontal direction of the near portion on the object-side surface along the principal meridian or the vertical reference line is OHPn, a surface power in a vertical direction is OVPn, a surface power in a vertical direction of the distance portion on an eye-side surface along the principal meridian or the vertical reference line is IVPf, and a surface power in a vertical direction of the near portion is IVPn,

the object-side surface includes elements of a toric surface with a surface power OHPf in a horizontal direction of the distance portion on the object-side surface greater than a surface power OVPf in a vertical direction of the distance portion on the object-side surface and a surface power OHPn in a horizontal direction of the near portion on the object-side surface greater than a surface power OVPn in a vertical direction of the near portion on the object-side surface,

and the eye-side surface along the principal meridian or the vertical reference line includes elements that cancel shifts in the surface power by the elements of the toric surface on the object-side surface, and satisfies the following conditions:

0VPf>

0VPn

IVPf−

IVPn>

OVPf−

OVPn

where, the surface powers IVPf and IVPn are absolute values.

16. The progressive power lens according to 15,

wherein a surface power IHPf in the horizontal direction of the distance portion on the eye-side surface along the principal meridian or the vertical reference line, and a surface power IHPn in the horizontal direction and a surface power IVPn in the vertical direction of the near portion satisfy the following conditions:

OHPf−

OVPf=IHPf−

IVPf

OHPn−

OVPn=IHPn−

IVPn

where, a prescription for astigmatism is not included, and the surface powers IHPf and IHPn are absolute values.

17. The progressive power lens according to claim 16,

wherein a surface power IHPf in the horizontal direction and a surface power IVPf in the vertical direction of the distance portion on the eye-side surface along the principal meridian or the vertical reference line, and a surface power IHPn in the horizontal direction and a surface power IVPn in the vertical direction of the near portion satisfy the following conditions:

IHPf−

IVPf=HPf/(1−

t/n×

OHPf)−

OVPf/(1−

t/n×

OVPf)

IHPn−

IVPn=HPn/(1−

t/n×

OHPn)−

OVPn/(1−

t/n×

OVPn)

where, t is the thickness (unit meter) of the progressive power lens, n is the refractive index of a base material of the progressive power lens, the surface powers IHPf, IVPf, IHPn, and IVPn are absolute values, and a prescription for astigmatism is not included.

18. The progressive power lens according to claim 17,

wherein the following conditions are further satisfied:

IHPf>

IVPf

IHPf>

IHPn.

19. The progressive power lens according to claim 18,

wherein the following condition is further satisfied OHPf−

OHPn.

20. The progressive power lens according to claim 17,

wherein the conditions are satisfied within a range of at least ±

10 mm with the principal meridian or the vertical reference line interposed.