Spectacle lens, manufacturing method, supply system, and supply program thereof

Patent metadata

Field	Value
Publication number	US-2017351116-A1
Application number	US-201515539862-A
Country	US
Kind code	A1
Filing date	Dec 28, 2015
Priority date	Dec 26, 2014
Publication date	Dec 7, 2017
Grant date	—

Abstract

A technology concerns a spectacle lens to suppress unnecessary convergence. In the spectacle lens, when an inner horizontal direction of the spectacle lens is a direction toward the nose of a user who wears the spectacle lens, and an outer horizontal direction of the spectacle lens is a direction toward an ear of the user, a shape of a base in prism is formed in a portion in which power continuously changes and through which a main line of sight, influenced by convergence of the user of the spectacle lens, passes such that at least a part of a base out prism, which may be generated in the portion, is cancelled.

First claim

1 . A spectacle lens, wherein
when an inner horizontal direction of the spectacle lens is a direction toward the nose of a user who wears the spectacle lens, and an outer horizontal direction of the spectacle lens is a direction toward an ear of the user, a shape of a base in prism is formed in a portion in which power continuously changes and through which a main line of sight influenced by convergence of the user of the spectacle lens passes, such that at least a part of a base out prism, which may be generated in the portion, is cancelled.

2 . The spectacle lens according to claim 1 , wherein
when the user wears the spectacle lens, the upper direction of the spectacle lens is a direction of top of the spectacle lens, and the lower direction of the spectacle lens is a direction of bottom of the spectacle lens, the spectacle lens includes a portion for viewing an object at a specific distance, a near portion for viewing an object at a distance nearer than the specific distance, and a corridor which is between the portion and the near portion and in which the power changes, the spectacle lens satisfying the following equation:
P N −P F <ADD* h/ 10

where P F denotes an amount of prism (Δ) at a power measurement point of the portion for viewing an object at a specific distance, and P N denotes an amount of prism (Δ) at a near power measurement point, the amount of prism indicates a positive value in a case of a base out prism, and a negative value in a case of a base in prism; and ADD denotes an addition power (D), and h denotes an amount of inset (mm) in the spectacle lens, in which a positive direction is toward the nose and a negative direction is toward the ear, with respect to a vertical line connecting an upper vertex and a lower vertex of the spectacle lens.

3 . The spectacle lens according to claim 2 , wherein the spectacle lens satisfies the following equation:
IP N −P F −ADD* h/ 10|≧0.25.

4 . The spectacle lens according to claim 1 , wherein
when the user wears the spectacle lens, the upper direction of the spectacle lens is a direction of top of the spectacle lens, and the lower direction of the spectacle lens is a direction of bottom of the spectacle lens, at least a part of the portion of the spectacle lens includes a shape of continuously twisting at least a shape of one of an object side surface and an eyeball side surface of the spectacle lens in the horizontal cross-sectional view of the portion, in the lower direction of the spectacle lens, so that the amount of the base in prism increases in the lower direction.

5 . The spectacle lens according to claim 4 , wherein
an absolute value of a difference between surface power values in the vertical direction in ±15 mm positions from the point through which the main line of sight passes is 0.25 D or more, on a horizontal line which is parallel with a line passing through two engraving marks of the spectacle lens, and which passes through any point on a line segment connecting a specific distance power measurement point and a near power measurement point.

6 . The spectacle lens according to claim 5 , wherein
any point on the line segment connecting the specific distance power measurement point and the near power measurement point is located in a ±3 mm range in a perpendicular direction from the mid-point between the specific distance power measurement point and the near power measurement point.

7 . The spectacle lens according to claim 4 , wherein
an absolute value of a difference between surface power values in the horizontal direction in ±5 mm positions from the point through which the main line of sight passes is 0.12 D or more, on a horizontal line which is parallel with a line passing through two engraving marks of the spectacle lens, and which passes through any point on a line segment connecting the specific distance power measurement point and the near power measurement point.

8 . The spectacle lens according to claim 7 , wherein
any point on the line segment connecting the specific distance power measurement point and the near power measurement point is located in a ±3 mm range in the perpendicular direction from the mid-point between the specific distance power measurement point and the near power measurement point.

9 . The spectacle lens according to claim 1 , wherein
the shape of the base in prism is also formed in an outer part and inner part in the horizontal direction from the portion of the spectacle lens.

10 . The spectacle lens according to claim 9 , wherein
when the user wears the spectacle lens, the upper direction of the spectacle lens is a direction of top of the spectacle lens, and the lower direction of the spectacle lens is a direction of bottom of the spectacle lens, an absolute value of a difference between surface power values in the vertical direction in ±15 mm positions from the point through which the main line of sight passes is 0.25 D or more, on a horizontal line which is parallel with a line passing through two engraving marks of the spectacle lens, and which passes through a point that is 3 mm higher in the vertical direction from the mid-point of the line segment connecting the specific distance power measurement point and the near power measurement point.

11 . The spectacle lens according to claim 9 , wherein
an absolute value of a difference between surface power values in the vertical direction in ±15 mm positions from the point through which the main line of sight passes is 0.25 D or more, on a horizontal line which is parallel with a line passing through two engraving marks of the spectacle lens, and which passes through a mid-point of the line segment connecting the specific distance power measurement point and the near power measurement point.

12 . The spectacle lens according to claim 9 , wherein
when the user wears the spectacle lens, the upper direction of the spectacle lens is a direction of top of the spectacle lens, and the lower direction of the spectacle lens is a direction of bottom of the spectacle lens, an absolute value of a difference between surface power values in the vertical direction in ±15 mm positions from the point through which the main line of sight passes is 0.25 D or more, on a horizontal line which is parallel with a line passing through two engraving marks of the spectacle lens, and which passes through a point that is 3 mm lower in the vertical direction from the mid-point of the line segment connecting the specific distance power measurement point and the near power measurement point.

13 . The spectacle lens according to claim 1 , wherein
the amount of the base in prism is decreased in the outer horizontal direction and inner horizontal direction from the portion of the spectacle lens.

14 . The spectacle lens according to claim 13 , wherein
when the user wears the spectacle lens, the upper direction of the spectacle lens is a direction of top of the spectacle lens, and the lower direction of the spectacle lens is a direction of bottom of the spectacle lens, an absolute value of a difference between surface power values in the horizontal direction in ±5 mm positions from the point through which the main line of sight passes is 0.12 D or more, on a horizontal line which is parallel with a line passing through two engraving marks of the spectacle lens, and which passes through a point that is 3 mm lower in the vertical direction from the mid-point of the line segment connecting the specific distance power measurement point and the near power measurement point.

15 . The spectacle lens according to claim 13 , wherein
an

Assignees

• Hoya Lens Thailand Ltd

Inventors

• Kaga Tadashi
• Ito Ayumu
• Kozu Kazuma

Classifications

• G02C7/02

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

• G02C7/14

  Mirrors; Prisms · CPC title

• G02C7/024

  Methods of designing ophthalmic lenses · CPC title

• G02C7/06

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

• G02C7/063 Primary

  Shape of the progressive surface · CPC title