Progressive mode changing method for progressive power lens, progressive mode changing system for progressive power lens, and program used in progressive mode changing system for progressive power lens

Abstract

Provided are a method for changing the progressive mode of a progressive power lens and a technique related thereto, the method comprising: a weight map acquisition step for obtaining a weight map on xy plane coordinates for changing from a progressive mode (1) to a progressive mode (2); a z coordinate value acquisition step in which a coordinate value (zaddp) is obtained by multiplying the approximate curvature (Cp) on xy plane coordinates at each point on a plane (alpha), which is a design plane, by a weight (wp) corresponding to each point on the weight map; and a design step for designing a new surface (alpha ') on the basis of the z-coordinate value (zaddp) obtained by the z-coordinate acquisition step.

Description

Technical Field

[0001] The present invention relates to a method for changing a progressive power addition pattern of a progressive power lens, a system for changing a progressive power addition pattern of a progressive power lens, and a program for a system for changing a progressive power addition pattern of a lens. Background Art

[0002] Claim 1 of Patent Document 1 describes a progressive power lens in which a power exceeding zero is superimposed on a prescription power in a specific region in such a manner that a prescribed portion in a transition region has a power corresponding to a distance between a near distance and a far distance, that is, a preset target distance. As described in Patent Document 1, a technique for adjusting a relationship between a distance on a primary line of sight and an added power is well-known.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Pamphlet of WO2016 / 047712 Summary of the Invention

[0006] Technical Problem to be Solved by the Invention

[0007] In the present specification, this relationship is referred to as an "addition curve". It is not easy to change the shape of the addition curve. If the shape of the addition curve is changed, it is obvious that changes also occur in portions other than the primary line of sight portion. As a result, it is necessary to confirm, through an astigmatism distribution map and a power distribution map, whether there are no defects in the astigmatism distribution and power distribution of the entire spectacle lens (that is, there are no defects in the design of the progressive power lens) accompanying the change in the shape of the addition curve. And this confirmation must be performed every time the shape of the addition curve is changed.

[0008] Depending on the wearer of the progressive power lens, there are cases where it is best to slow down the change in power near the near-use area of the transition zone, and conversely, there are cases where it is best to increase the change in power near the near-use area of the transition zone and, correspondingly, slow down the change in power near the far-use area of the transition zone. That is, the present inventors have found a technical problem of desiring to more easily change the addition curve according to the wearer as compared with the situation described in the above paragraph.

[0009] An object of an embodiment of the present invention is to easily adjust the shape of the addition curve without causing design defects.

[0010] Technical Solution for Solving the Problem

[0011] To solve the above technical problems, in one embodiment of the present invention, the inventor found that for the weight map on the xy plane coordinates for changing from progressive mode 1 to progressive mode 2, that is, the weight of the value of each point of the weight map that is continuous in all directions on the xy plane coordinates, multiply the weight of each point by the approximate curvature or z coordinate value described in detail later for each point. Based on this discovery, the following solution is proposed.

[0012] The first mode of the present invention is a method for changing the progressive mode of a progressive refractive power lens. The progressive refractive power lens has a surface on the object side and a surface on the eyeball side, and has a near vision area for visually recognizing an object at a near distance, a distance vision area capable of visually recognizing an object farther than the near distance, and a transition area where the refractive power gradually changes between the two areas. Among them,

[0013] When in the state of wearing glasses, when the axis passing through the center of the lens from the object side towards the eyeball side is set as the z-axis, the axis from the bottom to the top and orthogonal to the z-axis is set as the y-axis, and the axis from the left to the right and orthogonal to the z-axis is set as the x-axis, it has:

[0014] A weight map acquisition step of obtaining a weight map on the xy plane coordinates for changing from progressive mode 1 to progressive mode 2, that is, a weight map that is continuous in all directions on the xy plane coordinates;

[0015] An approximate curvature map acquisition step of obtaining a distribution map of the approximate curvature C for each point on the surface α as the design surface p on the xy plane coordinates;

[0016] A z coordinate value acquisition step of multiplying the approximate curvature C of each point on the xy plane coordinates of the distribution map p by the weight w corresponding to each point on the weight map p , and obtaining the z coordinate value z through the following formula addp ,

[0017] [Equation 1]

[0018]

[0019] A design step of designing a new surface α' based on the z coordinate value z obtained through the z coordinate value acquisition step addp .

[0020] It should be noted that the approximate curvature C p is defined as follows: The approximate curvature C of any point p (x, y, z) on the surface α p uses the reciprocal of the radius of the circle passing through the point p and the points p' (-x, -y, z) and (0, 0, z) that are rotationally symmetric to the point p in the xy plane perpendicular to the z-axis. When the point p is (0, 0, 0), the approximate curvature C pUse the average of the two principal curvatures of the point p on the surface α.

[0021] The method for changing the progressive power profile of the progressive power lens according to the second aspect of the present invention, based on the first aspect, the weight map acquisition step includes:

[0022] Linear weight map production step, obtaining the change ratio of the addition curve of progressive profile 2 to the addition curve of progressive profile 1 on the xy plane coordinates from the progressive start point to the near vision power measurement reference point according to the distance on the xy plane coordinates from the progressive start point to the near vision power measurement reference point;

[0023] Planar weight map production step, expanding the relationship between the distance and the change ratio obtained in the linear weight map production step in a rotationally symmetric manner around the progressive start point on the xy plane coordinates;

[0024] Planar weight map adjustment step, in the planar weight map obtained in the planar weight map production step, changing the change ratio to 1 above the progressive start point, and smoothing the discontinuity of the planar weight map generated by this change to maintain continuity.

[0025] The method for changing the progressive power profile of the progressive power lens according to the third aspect of the present invention, based on the second aspect, in the planar weight map adjustment step, converting the xy plane coordinates in the planar weight map to polar coordinates, and for the term of the change ratio in the function constituting the planar weight map, multiplying by 0 when the polar coordinate is 0 ≤ θ < π, and multiplying by sin 2 θ when the polar coordinate is π ≤ θ < 2π, to smooth the discontinuity of the planar weight map to maintain continuity.

[0026] The method for changing the progressive power profile of the progressive power lens according to the fourth aspect of the present invention, based on any one of the first to third aspects, when changing from progressive profile 1 to progressive profile 2, the change ratio of the addition power after the change to the addition power before the change is less than 0.125.

[0027] The method for changing the progressive power profile of the progressive power lens according to the fifth aspect of the present invention, based on any one of the first to fourth aspects,

[0028] The near vision area is an area where the power is (spherical power S + addition power ADD - 0.12D) or more,

[0029] The far vision area is a part for visually recognizing objects farther than the near distance and is an area where the power is within the range of (spherical power S ± 0.12D).

[0030] Method for changing the progressive power pattern of the progressive power lens according to the sixth aspect of the present invention, wherein,

[0031] There is a determination step that determines whether the difference between the added power in the surface α' designed by the design step and the added power in the surface α before multiplying by the weight w exceeds a threshold value, and whether the difference between the curvature of the distance vision area in the surface α' designed by the design step and the curvature of the distance vision area in the surface α before multiplying by the weight w exceeds at least one of the threshold values. p There is a determination step that determines whether the difference between the added power in the surface α' designed by the design step and the added power in the surface α before multiplying by the weight w exceeds a threshold value, and whether the difference between the curvature of the distance vision area in the surface α' designed by the design step and the curvature of the distance vision area in the surface α before multiplying by the weight w exceeds at least one of the threshold values. p In the case where it is determined in the determination step that the threshold value is exceeded, the new z coordinate value z(x, y) of each point is obtained by the following formula, and a redesign step of designing a surface α'' in which each point has the z coordinate value z is performed.

[0032] In the case where it is determined in the determination step that the threshold value is exceeded, the new z coordinate value z(x, y) of each point is obtained by the following formula, and a redesign step of designing a surface α'' in which each point has the z coordinate value z is performed. p In the case where it is determined in the determination step that the threshold value is exceeded, the new z coordinate value z(x, y) of each point is obtained by the following formula, and a redesign step of designing a surface α'' in which each point has the z coordinate value z is performed. p In the case where it is determined in the determination step that the threshold value is exceeded, the new z coordinate value z(x, y) of each point is obtained by the following formula, and a redesign step of designing a surface α'' in which each point has the z coordinate value z is performed.

[0033] [Formula 2]

[0034]

[0035] C fb is the curvature of the distance vision area before multiplying by the weight w, C p is the curvature of the distance vision area before multiplying by the weight w, C nb is the curvature of the near vision area before multiplying by the weight w, C p is the curvature of the near vision area before multiplying by the weight w, C fa is the curvature of the distance vision area after multiplying by the weight w, C p is the curvature of the distance vision area after multiplying by the weight w, C na is the curvature of the near vision area after multiplying by the weight w, C p is the curvature of the near vision area after multiplying by the weight w.

[0036] Method for changing the progressive power pattern of the progressive power lens according to the seventh aspect of the present invention, the progressive power lens having an object side surface and an eye side surface, and having a near vision area for visually recognizing an object at a near distance, a distance vision area capable of visually recognizing an object farther than the near distance, and a transition area in which the refractive power progresses between the two areas, wherein,

[0037] In the state of wearing glasses, when the axis passing through the center of the lens from the object side toward the eye side is set as the z axis, the axis from the lower side toward the upper side and orthogonal to the z axis is set as the y axis, and the axis from the left side toward the right side and orthogonal to the z axis is set as the x axis, it has:

[0038] A weight map acquisition step of obtaining a weight map on the xy plane coordinates for changing from progressive power pattern 1 to progressive power pattern 2, that is, a weight map having continuity in all directions on the xy plane coordinates;

[0039] A z coordinate value map acquisition step of obtaining a distribution map of the z coordinate values on the xy plane coordinates for each point on the surface α as the design surface.

[0040] Z - coordinate value acquisition step: multiplying the Z - coordinate value on the XY plane coordinates of the distribution map by the weight w corresponding to each point on the weight map p to obtain the Z - coordinate value z addp ; Design step: designing a new surface α′ based on the Z - coordinate value z obtained through the Z - coordinate value acquisition step addp Design a new surface α′.

[0041] The progressive power lens progressive mode change system according to the eighth aspect of the present invention, the progressive power lens having an object - side surface and an eye - side surface, and having a near - vision area for visually recognizing an object at a near distance, a distance - vision area for visually recognizing an object farther than the near distance, and a transition area where the refractive power progresses between the two. Among them,

[0042] When in a state of wearing glasses, when the axis passing through the center of the lens from the object side toward the eye side is set as the z - axis, the axis from the lower side toward the upper side and orthogonal to the z - axis is set as the y - axis, and the axis from the left side toward the right side and orthogonal to the z - axis is set as the x - axis, it has:

[0043] A weight map acquisition unit that obtains a weight map on the XY plane coordinates for changing from progressive mode 1 to progressive mode 2, that is, a weight map having continuity in all directions on the XY plane coordinates;

[0044] An approximate curvature map acquisition unit that acquires an approximate curvature C for each point on the surface α as the design surface p in the distribution map on the XY plane coordinates; a Z - coordinate value acquisition unit that multiplies the approximate curvature C at each point on the XY plane coordinates of the distribution map p by the weight w corresponding to each point on the weight map p to obtain the Z - coordinate value z through the following formula addp ;

[0045] [Equation 3]

[0046]

[0047] A design unit that designs a new surface α′ based on the Z - coordinate value z obtained by the Z - coordinate value acquisition unit addp Design a new surface α′,

[0048] wherein the approximate curvature C p is defined as follows: the approximate curvature C of an arbitrary point p(x, y, z) on the surface α p uses the reciprocal of the radius of the circle passing through the point p and the points p′(−x, −y, z) and (0, 0, z) that are rotationally symmetric with respect to the point p in the XY plane perpendicular to the z - axis. Among them, when the point p is (0, 0, 0), the approximate curvature Cp Use the average of the two principal curvatures of the point p in the surface α.

[0049] Based on the eighth aspect, the progressive power lens progressive mode change system according to the ninth aspect of the present invention, the weight map acquisition unit includes:

[0050] A linear weight map production unit that obtains, based on the distance from the progressive start point to the near vision power measurement reference point on the xy plane coordinates, the change ratio of the addition curve of progressive mode 2 to the addition curve of progressive mode 1 on the xy plane coordinates.

[0051] A planar weight map production unit that expands, with the progressive start point as the rotational symmetry, the relationship between the distance and the change ratio obtained by the linear weight map production unit on the xy plane coordinates.

[0052] A planar weight map adjustment unit that, in the planar weight map obtained by the planar weight map production unit, changes the change ratio to 1 above the progressive start point, and smooths the discontinuity of the planar weight map generated by this change to maintain continuity.

[0053] Based on the eighth aspect or the ninth aspect, the progressive power lens progressive mode change system according to the tenth aspect of the present invention includes:

[0054] A determination unit that determines whether the difference between the addition power in the surface α′ designed by the design unit and the addition power in the surface α before multiplying by the weight w exceeds a threshold, and whether the difference between the curvature of the distant vision area in the surface α′ designed by the design unit and the curvature of the distant vision area in the surface α before multiplying by the weight w exceeds a threshold, at least either one of them. p A redesign unit that, when the determination unit determines that it exceeds the threshold, obtains the new z coordinate value z of each point through the formula, and designs the surface α″ in which each point has the z coordinate value z. p p

[0055] p <000030>

[0056] <000030>

[0056] A program for the progressive power lens progressive mode change system according to the eleventh aspect of the present invention. The progressive power lens has a surface on the object side and a surface on the eyeball side, and has a near vision area for visually recognizing an object at a near distance, a distant vision area capable of visually recognizing an object farther than the near distance, and a transition area where the refractive power progresses between the two. Among them,

[0057] In the state of wearing glasses, when the axis passing through the center of the lens from the object side toward the eyeball side is set as the z-axis, the axis from the lower side toward the upper side and orthogonal to the z-axis is set as the y-axis, and the axis from the left side toward the right side and orthogonal to the z-axis is set as the x-axis, the computer functions as a weight map acquisition unit, an approximate curvature map acquisition unit, a z-coordinate value acquisition unit, and a design unit. The weight map acquisition unit obtains a weight map on the xy-plane coordinates for changing from progressive mode 1 to progressive mode 2, that is, a weight map having continuity in all directions on the xy-plane coordinates. The approximate curvature map acquisition unit acquires the approximate curvature C for each point on the surface α as the design surface p The distribution map on the xy-plane coordinates, and the z-coordinate value acquisition unit multiplies the approximate curvature C p at each point on the xy-plane coordinates of the distribution map by the weight w corresponding to each point on the weight map p and obtains the z-coordinate value z through the following formula addp ,

[0058] [Equation 4]

[0059]

[0060] The design unit designs a new surface α′ based on the z-coordinate value z obtained by the z-coordinate value acquisition unit addp where the approximate curvature Cp is defined as follows: The approximate curvature C of any point p(x, y, z) on the surface α p uses the reciprocal of the radius of the circle passing through the point p and the points p'(-x, -y, z) and (0, 0, z) that are rotationally symmetric to the point p in the xy-plane perpendicular to the z-axis. When the point p is (0, 0, 0), the approximate curvature C p uses the average of the two principal curvatures of the point p on the surface α.

[0061] A program for a progressive mode change system of a progressive refractive power lens according to the twelfth aspect of the present invention. On the basis of the eleventh aspect, the weight map acquisition unit includes:

[0062] A linear weight map production unit that obtains the change ratio of the addition curve of progressive mode 2 to the addition curve of progressive mode 1 from the progressive start point to the near vision power measurement reference point on the xy-plane coordinates according to the distance from the progressive start point to the near vision power measurement reference point on the xy-plane coordinates;

[0063] A planar weight map production unit that expands the relationship between the distance and the change ratio obtained by the linear weight map production unit in a rotationally symmetric manner with the progressive start point on the xy-plane coordinates;

[0064] The planar weight map adjustment unit changes the change ratio to 1 above the progressive start point in the planar weight map obtained by the planar weight map creation unit, and smooths the discontinuity of the planar weight map caused by this change to maintain continuity.

[0065] A program for a progressive mode change system of a progressive refractive power lens according to a thirteenth aspect of the present invention causes a computer to function as a determination unit and a redesign unit on the basis of the eleventh aspect or the twelfth aspect. The determination unit determines whether the difference between the addition power in the surface α′ designed by the design unit and the addition power in the surface α before multiplying by the weight w exceeds a threshold value, and whether the difference between the curvature of the distance vision area in the surface α′ designed by the design unit and the curvature of the distance vision area in the surface α before multiplying by the weight w exceeds at least one of the threshold values. When the determination unit determines that the threshold value is exceeded, the redesign unit obtains the new z coordinate value z p of each point by the above formula, and designs the surface α″ in which each point has the z coordinate value z p p p

[0066] Advantages of the Invention

[0067] According to an embodiment of the present invention, it is possible to easily change the shape of the addition curve without causing design defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 is a flowchart showing a method for changing a progressive mode of a progressive refractive power lens according to one aspect of the present invention.

[0069] Figure 2 is a block diagram showing the configuration of a progressive mode change system of a progressive refractive power lens according to one aspect of the present invention.

[0070] Figure 3 is an addition curve of Reference Example 1 (solid line), Example 1 (ADD reduced by 10%) (dotted line), and Example 2 (ADD increased by 10%) (dashed line).

[0071] Figure 4A is an average diopter distribution diagram of the progressive refracting surface in Reference Example 1.

[0072] Figure 4B is an astigmatism distribution diagram of the progressive refracting surface in Reference Example 1.

[0073] Figure 5 ​​​It is a diagram showing the linear weight diagrams in Example 1 (lower side) and Example 2 (upper side) together with the addition curve of Reference Example 1. The left vertical axis represents the refractive power (D) of the addition curve, the right vertical axis represents the weight value, and the horizontal axis represents the distance (mm) from the progressive start point to the near vision power measurement reference point on the xy plane coordinates.

[0074] Figure 6 It is a planar weight diagram obtained by expanding the linear weight diagram in Example 1 with rotational symmetry about the progressive start point on the xy plane coordinates. The horizontal axis (left - right direction of the paper) is the x - axis, the vertical axis (up - down direction of the paper) is the y - axis, and the three - dimensional direction is the t - axis (w p )

[0075] Figure 7 It is a diagram showing the case where, in the planar weight diagram of Example 1, the change ratio is changed to 1 above the horizontal line (x - axis direction) passing through the progressive start point in the +y direction, and the discontinuity of the planar weight diagram resulting from this change is smoothed to maintain continuity.

[0076] Figure 8A It is the average power distribution diagram of the progressive refractive surface in Example 1.

[0077] Figure 8B It is the astigmatism distribution diagram of the progressive refractive surface in Example 1.

[0078] Figure 9 It is a planar weight diagram obtained by expanding the linear weight diagram in Example 2 with rotational symmetry about the progressive start point on the xy plane coordinates. The horizontal axis (left - right direction of the paper) is the x - axis, the vertical axis (up - down direction of the paper) is the y - axis, and the three - dimensional direction is the t - axis (w p )

[0079] Figure 10 It is a diagram showing the case where, in the planar weight diagram of Example 2, the change ratio is changed to 1 above the horizontal line (x - axis direction) passing through the progressive start point in the +y direction, and the discontinuity of the planar weight diagram resulting from this change is smoothed to maintain continuity.

[0080] Figure 11A It is the average power distribution diagram of the progressive refractive surface in Example 2.

[0081] Figure 11B It is the astigmatism distribution diagram of the progressive refractive surface in Example 2. Detailed implementation mode

[0082] Hereinafter, the implementation modes of the present invention will be described. The following description based on the drawings is an example, and the present invention is not limited to the example mode. In this specification, "~" means above and below a specified value.

[0083] <Definition>

[0084] The spectacle lens described in this specification has a surface on the object side and a surface on the eyeball side. The "surface on the object side" refers to the surface on the object side when the wearer wears the spectacles equipped with the spectacle lens, and the "surface on the eyeball side" refers to the opposite, that is, the surface on the eyeball side when the wearer wears the spectacles equipped with the spectacle lens. The surface on the object side can also be referred to as the outer surface, and the surface on the eyeball side can be referred to as the inner surface.

[0085] In this specification, in the orientation (hereinafter, top view) when facing the outer surface of the spectacle lens, the left-right direction is set as the x-axis, the up-down direction is set as the y-axis, and the direction perpendicular to the x-axis and the y-axis in the thickness direction of the spectacle lens is set as the z-axis. The z-axis is also the optical axis direction of the spectacle lens. The origin is the center of the lens. In addition, the center of the lens refers to the optical center or geometric center of the spectacle lens. In this specification, an example where the optical center and the geometric center are substantially the same is shown.

[0086] The right side (3 o'clock direction) is set as the +x direction, the left side (9 o'clock direction) is set as the -x direction, the upper side (0 o'clock direction) is set as the +y direction, the lower side (6 o'clock direction) is set as the -y direction, the object side direction is set as the +z direction, and the opposite direction (inside direction) is set as the -z direction.

[0087] The x-axis is also referred to as the x direction, the y-axis is also referred to as the y direction, and the z-axis is also referred to as the z direction. The content of this paragraph can be converted as follows.

[0088] "In the wearing state of the spectacle lens, the axis passing through the center of the lens from the object side toward the eyeball side is set as the z-axis, the axis from the lower side toward the upper side and orthogonal to the z-axis is set as the y-axis, and the axis from the left toward the right and orthogonal to the z-axis is set as the x-axis."

[0089] As a spectacle lens according to one embodiment of the present invention, an example of a progressive power lens is shown. The progressive power lens has a near vision area for visually recognizing an object at a near distance, a distance vision area for visually recognizing an object at a distance farther than the near distance, and a transition area where the refractive power gradually changes between the two. Hereinafter, the spectacle lens as a progressive power lens is also simply referred to as a "lens".

[0090] In the near vision zone of one embodiment of the present invention, a refractive power for observing an object at a near distance is provided. This refractive power is the near vision power, which is a value obtained by adding the spherical power S (distance power) and the addition ADD. When measuring the power at least at the near vision zone measurement reference point N, it is equal to or higher than the near vision power. Even if the refractive power increases after exceeding the near vision zone measurement reference point N in the direction from the progressive start point towards the near vision zone measurement reference point N, and the refractive power in the near vision zone temporarily exceeds the near vision power (so-called overshoot), it does not matter. In one embodiment of the present invention, a region where the refractive power is equal to or higher than (near vision power - 0.12 D) is regarded as the near vision zone.

[0091] In the distance vision zone of one embodiment of the present invention, a refractive power for observing an object farther than the near distance is provided. This refractive power is the spherical power S (distance power). When measuring the power at least at the distance vision zone measurement reference point F, it is equal to or lower than the spherical power S. In the distance vision zone of one embodiment of the present invention, the refractive power is substantially constant. In one embodiment of the present invention, a region where the refractive power is within the range of (spherical power S ± 0.12 D) is regarded as the distance vision zone.

[0092] In the transition zone, the refractive power gradually changes. The difference between the refractive power for observing a distant object and the refractive power for observing a near object is called the addition ADD (unit: D [diopter]; hereinafter, the same applies to the refractive power and power described in this specification). In this specification, as a statement representing the refractive degree of a lens, the refractive power is sometimes used instead of the so-called power or diopter.

[0093] In the transition zone, the refractive power changes continuously. The transition zone can also be called the progressive zone. The progressive zone length is defined as the distance between the progressive zone start point at which the change in refractive power starts and the progressive zone end point at which the change in refractive power ends.

[0094] The distance vision zone is the above-mentioned progressive start point and the region above the progressive start point of the progressive refractive power lens. The near vision zone is usually the region of the progressive refractive power lens that includes the progressive end point and below it. The transition zone is the region between the distance vision zone and the near vision zone, and is the region where the refractive power changes progressively.

[0095] In one embodiment of the present invention, for easy understanding of the description, an example of a case where the outer surface is spherical or toric and the inner surface is a progressive surface (so-called inner surface progressive refractive power lens) is given. Of course, this is just an example, and the outer surface can also be a progressive surface. The progressive surface of one embodiment of the present invention has the following structure.

[0096] On the inner surface of the lens of one embodiment of the present invention, the near vision region for observing a short distance (for example, 40 cm to 60 cm) is arranged below (-y direction) the lens when the lens is worn.

[0097] On the other hand, in one aspect of the present invention, a distance vision area for visually recognizing an object located at a distance farther than the near distance is disposed above the near vision area (+y direction). The distance vision area in one aspect of the present invention is not particularly limited and may be for long distances (e.g., 2 m to infinity) or for medium distances (e.g., 60 cm to 200 cm).

[0098] That is, the lens in one aspect of the present invention may be an intermediate-near lens corresponding to the object distance from the intermediate distance (1 m to 40 cm) to the near distance (40 cm to 10 cm), or a near-near lens corresponding to the near distance.

[0099] In one aspect of the present invention, for the sake of convenience in explanation, a case where the distance vision area is a long-distance use area is exemplified.

[0100] It should be noted that a near vision area measurement reference point for measuring the reference power is set in the near vision area. Similarly, a distance vision area measurement reference point for measuring the reference power is also set in the distance vision area. The power here is the so-called spherical power S. The power at the near vision area measurement reference point is (S + ADD (added power)).

[0101] The "distance vision area measurement reference point" refers to the point of the spherical refractive power and the cylindrical refractive power recorded in the prescription data for giving the wearer information to the progressive refractive power lens. The spherical refractive power is the so-called spherical power S (distance power S), and the cylindrical refractive power is the so-called astigmatic power C. The distance vision area measurement reference point (hereinafter, also simply referred to as the measurement reference point F, point F.) is, for example, a point located on the meridian and 8.0 mm away from the horizontal line connecting the positions of the two hidden marks toward the distance vision area side.

[0102] The "eye point (EP)" is the position where the line of sight passes when looking straight ahead while wearing the progressive refractive power lens. Usually, it is disposed at a position several millimeters below the measurement reference point F. The change in refractive power occurs below this EP. The point where the change in progressive power starts is also called the progressive start point. In the embodiment, the geometric center GC further below the EP is made to coincide with the progressive start point and also with the prism reference point.

[0103] The "near vision area measurement reference point" refers to the point in a state where the added power ADD is added to the spherical refractive power recorded in the prescription data for the wearer information, and is the point where the spherical power S + ADD is first achieved when observing from the upper side to the lower side of the lens. The near vision area measurement reference point (hereinafter, also simply referred to as the measurement reference point N, point N.) is also located on the meridian.

[0104] In addition, the prescription data of the wearer information is recorded in the lens case of the progressive power lens. That is, if there is a lens case, the progressive power lens can be determined as an object based on the prescription data of the wearer information. Moreover, the progressive power lens is usually sold as a set with the lens case. Therefore, the progressive power lens attached with the lens case also reflects the technical idea of the present invention, and the combination of the lens case and the progressive power lens is the same.

[0105] In addition, the measurement reference point F, the fitting point or the eye point EP, and the measurement reference point N can be determined by referring to the remark chart or centration chart issued by the lens manufacturer. In addition, the progressive start point can also be determined using a lensometer for power measurement.

[0106] The "primary line of sight" is the locus line on the lens surface where the line of sight moves when observing an object from the front in the near vision area, far vision area, and transition area of the progressive power lens. The primary line of sight moves towards the position closer to the nose in the transition area and near vision area. The moving distance towards the nose is called the inward shift amount.

[0107] The "meridian" refers to the vertical line that is orthogonal to the horizontal line connecting the positions of two hidden marks provided on the progressive power lens and passes through the midpoint of the positions of the two hidden marks. The meridian corresponds to the y-axis of the distribution diagrams shown in the respective figures of the present application.

[0108] <Method for changing the progressive power pattern of a progressive power lens according to an aspect of the present invention>

[0109] Figure 1 It is a schematic flowchart of a method for changing the progressive power pattern of a progressive power lens according to an aspect of the present invention.

[0110] The method for changing the progressive power pattern of a progressive power lens of a spectacle lens according to an aspect of the present invention at least includes the following steps.

[0111] · Weight map acquisition step S1: Obtain a weight map on the xy plane coordinates for changing from progressive power pattern 1 to progressive power pattern 2, that is, a weight map having continuity in all directions on the xy plane coordinates

[0112] · Approximate curvature map acquisition step S2: Obtain the approximate curvature C for each point on the surface α (for example, at least one of the two surfaces, and in one aspect of the present invention, it is the inner surface) as the design surface p Distribution diagram on the xy plane coordinates

[0113] · z coordinate value acquisition step S3: Multiply the approximate curvature C for each point on the xy plane coordinates of the distribution diagram p by the weight w corresponding to each point on the weight map p, the z - coordinate value z is obtained through the following formula addp

[0114] [Equation 5]

[0115]

[0116] ……(Mathematical formula 1)

[0117] ·Based on the z - coordinate value z obtained through the z - coordinate value acquisition process addp The design process S4 for designing the new surface α′

[0118] Approximate curvature C p Is defined as follows.

[0119] The approximate curvature C of an arbitrary point p(x, y, z) on the surface α p Uses the reciprocal of the radius of the circle passing through the point p and the points p′(−x, −y, z) and (0, 0, z) which are rotationally symmetric to the point p in the xy - plane perpendicular to the z - axis. Where, when the point p is (0, 0, 0), the approximate curvature C p Uses the average of the two principal curvatures of the point p in the surface α. "Two principal curvatures" refer to the maximum curvature and the minimum curvature among the curvatures.

[0120] The distribution map of the approximate curvature C on the xy - plane coordinates p Is also called an "approximate curvature map".

[0121] This approximate curvature map is a distribution map with the value of C p As the third axis on the xy - plane coordinates. In order to distinguish it from the z - axis described in <Definition>, this third axis is called the s - axis. In one embodiment of the present invention, like the z - axis, the s - axis is the normal line of the xy - plane and the origin is the lens center.

[0122] The approximate curvature map can be visually recognized specifically as a distribution map or obtained as a distribution map in terms of data.

[0123] The approximate curvature map can also obtain a prepared map. The approximate curvature map acquisition process S2 for obtaining the approximate curvature map that has been obtained can also be performed. Or, when implementing one embodiment of the present invention, the approximate curvature can also be calculated based on the xyz - coordinate values of each point of the existing surface shape. The approximate curvature map acquisition process S2 for calculating the approximate curvature based on the xyz - coordinate values of each point of the surface α before smoothing can also be performed.

[0124] The weight map of one embodiment of the present invention is used to weight each point corresponding to the xy - plane coordinates of the approximate curvature map. This weight map is on the xy - plane coordinates with the weight w pThe value is a distribution diagram of the third axis. To distinguish it from the z-axis described in <Definition>, this third axis is referred to as the t-axis. In one embodiment of the present invention, like the z-axis, the t-axis is the normal line of the xy plane, and the origin is the center of the lens.

[0125] The weight diagram of one embodiment of the present invention has continuity in all directions on the xy plane coordinates. This means that among the three axes of x, y, and t, the weight diagram can be represented by a continuous line (a straight line or a curve).

[0126] The weight diagram can be obtained as a distribution diagram that can be visually recognized specifically, or as a distribution diagram in terms of data.

[0127] The weight diagram of one embodiment of the present invention can also obtain a prepared weight diagram. A weight diagram acquisition step S1 for obtaining the obtained weight diagram can also be performed. Alternatively, a weight diagram acquisition step S1 for creating a weight diagram by the method of a specific example below can also be performed.

[0128] The weight diagram acquisition step S1 may also include:

[0129] A linear weight diagram production step S1a, according to the distance from the progressive start point to the near vision power measurement reference point on the xy plane coordinates, obtains the change ratio of the joining curve of progressive method 2 to the joining curve of progressive method 1 from the progressive start point to the near vision power measurement reference point on the xy plane coordinates;

[0130] A planar weight diagram production step S1b, expands the relationship between the distance and the change ratio obtained in the linear weight diagram production step in a rotationally symmetric manner with the progressive start point on the xy plane coordinates;

[0131] A planar weight diagram adjustment step S1c, in the planar weight diagram obtained by the planar weight diagram production step, changes the change ratio to 1 above the progressive start point (specifically, above the horizontal line passing through the progressive start point, in another example, the distance vision area), and smooths the discontinuity of the planar weight diagram generated by this change while maintaining continuity.

[0132] In the planar weight diagram adjustment step S1c, the xy plane coordinates in the planar weight diagram can also be converted to polar coordinates, and for the term of the change ratio in the function constituting the planar weight diagram, multiply by 0 when the polar coordinate is 0 ≤ θ < π, and multiply by sin2θ when the polar coordinate is π ≤ θ < 2π, to smooth the discontinuity of the planar weight diagram while maintaining continuity.

[0133] As one aspect of the present invention, the above example is cited as a method for smoothing the discontinuity of the planar weight map, but it is not limited to this method. For example, a smoothing filter process used in image processing may also be performed. In addition, a known method of B-spline smoothing or polygonal surface smoothing may also be used.

[0134] When changing from the progressive method 1 to the progressive method 2, the change ratio of the addition power after the change to the addition power before the change is less than 0.125, but it is preferable because it does not involve unreasonable changes.

[0135] In one embodiment of the present invention, the z coordinate value z obtained in the z coordinate value acquisition step S3 is used to obtain the z coordinate value. addp The design step S4 of designing a new surface α′ is performed. The curved surface can be interpolated between each coordinate value (each point) by a known method (e.g., spline interpolation). Furthermore, if the refractive index of the material used as the lens substrate is known, the refractive power of a predetermined portion of the surface α′ can also be determined.

[0136] In one embodiment of the present invention, an example is given in which the design surface α is a progressive surface of the inner surface, but the present invention is not limited to this example. For example, the design surface α may not be a specific surface, but may be a hypothetical surface having a power distribution and astigmatism distribution when the surface on the object side and the surface on the eyeball side are combined as the design surface α (this content is adopted in the items of the embodiments described later). Furthermore, after a new surface α′ is designed through a design process, contributions to the power distribution and astigmatism distribution of the surface α′ may be distributed between the surface on the object side and the surface on the eyeball side.

[0137] The following is an example showing that one aspect of the present invention is more useful. The method for changing the progressive mode of a progressive-power lens according to one aspect of the present invention preferably further comprises the following steps.

[0138] A determination step S5 of determining whether the added power of the surface α′ designed in the design step is different from the added power of the surface α before the smoothing step by more than a threshold value (determination 1), and whether the curvature of the distance zone of the surface α′ designed in the design step is different from the curvature of the distance zone of the surface α before the smoothing step by more than a threshold value (determination 2) (preferably both determination 1 and determination 2).

[0139] Redesign step S6, when it is determined that the points are different in the determination step, the new z coordinate value z of each point is obtained by the following formula: p The z coordinate value of (x, y) is then obtained, and each point is designed to have the z coordinate value z p α″

[0140] [Equation 6]

[0141]

[0142] ……(Mathematical formula 2)

[0143] C fb is multiplied by the weight w p the curvature of the previous distance vision area, C nb is multiplied by the weight w p the curvature of the previous near vision area, C fa is multiplied by the weight w p the curvature of the subsequent distance vision area, C na is multiplied by the weight w p the curvature of the subsequent near vision area.

[0144] The curvature of the distance vision area can also be said to be the distance vision power measured at the reference point F in the distance vision area, that is, the spherical power S.

[0145] The added power in the surface α′ designed through the said design process is still different from the added power in the surface α before the said smoothing process. The same applies to the curvature of the distance vision area. In the above determination process S5, it is determined whether the difference between the surface α and the surface α′ is large.

[0146] It can also be determined whether the difference is large according to whether the difference exceeds a threshold value. As this threshold value, for example, 0.25D (preferably 0.12D, 0.10D, 0.08D, 0.05D, 0.03D, 0.01D) can be cited for both determination 1 and determination 2.

[0147] In the case where the difference between the surface α and the surface α′ is large, it is preferable to reduce this difference. The above-mentioned redesign process S6 stipulates this specific method.

[0148] In one aspect of the present invention, only by performing the above-mentioned redesign process, the difference in the added power and / or the curvature of the distance vision area between the surface α and the surface α′ can be reduced below the threshold value (eliminated according to the situation). This is because, in one aspect of the present invention, on the basis of adopting the concept of "the relationality between the approximate curvature C p and the z coordinate value z addp ", the technical idea of multiplying the weight by the approximate curvature map on the same xy plane coordinates through a weight map having continuity on the xy plane coordinates is adopted. This preferred example also contributes greatly to the content that, as an effect of the present invention, no design defects are generated and the shape of the added curve can be easily changed. Furthermore, since it can be easily changed, it also contributes greatly to the reduction of the time required for the change of the progressive type.

[0149] According to an embodiment of the present invention, it is possible to easily change the shape of the added curve without generating design defects.

[0150] <Modification examples, etc.>

[0151] The above has described one aspect of the present invention, but the above disclosure represents an exemplary aspect of the present invention. That is, the technical scope of the present invention is not limited to the above exemplary aspect, and various changes can be made without departing from its gist. In addition, for the following modification examples, the above disclosure can also be arbitrarily selected and combined.

[0152] As the spectacle lens according to one aspect of the present invention, a distance vision area for visually recognizing an object farther than a near distance is exemplified. On the other hand, it may not be a part for stably visually recognizing an object farther than a near distance, but simply a distance vision area that "can" visually recognize an object farther than a near distance.

[0153] The distance vision area in the spectacle lens according to one aspect of the present invention may also be a narrow part. For example, it may be a progressive power lens having a structure in which the power progresses not only downward but also upward from the progressive start point (in most cases, the power decreases upward). At this time, a distance vision area measurement reference point is prepared in the progressive power lens, but this is only a reference point for confirming whether the power with respect to a specified distance can be ensured, and a wide distance vision area is not required. As a spectacle lens of such a type, the product name (registered trademark) TF can be cited.

[0154] The change in the progressive method is not limited to the increase or decrease of the added power. For example, the change in power may be made gentle near the near vision area of the transition zone, or conversely, the change in power may be made large near the near vision area of the transition zone and accordingly the change in power may be made gentle near the distance vision area of the transition zone. In short, the relationship between the approximate curvature and the z coordinate value is effectively used as a parameter when changing the progressive method in one aspect of the present invention. On this basis, a weight map is also used for the weight. Then, the approximate curvature corresponding to the xy plane coordinates of the weight map is weighted. As long as the above technical idea is based, any change in the progressive method can be easily performed without design defects. In this regard, the technical significance of the present invention is great.

[0155] As an example of one aspect of the present invention, the use of the approximate curvature is exemplified. On the other hand, instead of the approximate curvature, the z coordinate itself may be used. That is, instead of the approximate curvature map, a z coordinate value map on the xy plane may be obtained and this z coordinate value map may be utilized. The structure reflecting this technical idea is as follows. The following structure can be applied not only to the method of changing the progressive method but also to the manufacturing method, system, and program described later.

[0156] "A method for changing the progressive manner of a progressive power lens, the progressive power lens having an object-side surface and an eye-side surface, and having a near vision area for visually recognizing an object at a near distance, a far vision area for visually recognizing an object farther than the near distance, and a transition area for making the refractive power progressive between the two areas, wherein,

[0157] when in a spectacle-wearing state, with the axis passing through the center of the lens from the object side towards the eye side being the z-axis, the axis from the bottom towards the top and orthogonal to the z-axis being the y-axis, and the axis from the left towards the right and orthogonal to the z-axis being the x-axis, it has:

[0158] a weight map acquisition step of obtaining a weight map on the xy-plane coordinates for changing from progressive manner 1 to progressive manner 2, that is, a weight map having continuity in all directions on the xy-plane coordinates;

[0159] a z-coordinate value map acquisition step of obtaining a distribution map of the z-coordinate values on the xy-plane coordinates for each point on the surface α as the design surface;

[0160] a z-coordinate value acquisition step of multiplying the z-coordinate values on the xy-plane coordinates of the said distribution map by the weight w corresponding to each point on the said weight map p , to obtain the z-coordinate value z addp ;

[0161] a design step of designing a new surface α' based on the z-coordinate value z obtained through the said z-coordinate value acquisition step addp .

[0162] The technical idea of the present invention is also reflected in a method for manufacturing spectacle lenses in which the lens substrate is processed in such a way as to realize the surface designed by the method for changing the progressive manner of a progressive power lens according to one embodiment of the present invention.

[0163] Figure 2 is a schematic block diagram showing the configuration of a system for changing the progressive manner of a progressive power lens according to one embodiment of the present invention.

[0164] The technical idea of the present invention can also be applied to a system 10 for changing the progressive manner of a progressive power lens. An example of its structure is as follows.

[0165] "A system for changing the progressive manner of a progressive power lens, the progressive power lens having an object-side surface and an eye-side surface, and having a near vision area for visually recognizing an object at a near distance, a far vision area for visually recognizing an object farther than the near distance, and a transition area for making the refractive power progressive between the two areas, wherein, it has:

[0166] A weight map acquisition unit 1 that obtains a weight map on the xy plane coordinates for changing from progressive mode 1 to progressive mode 2, that is, a weight map that is continuous in all directions on the xy plane coordinates;

[0167] An approximate curvature map acquisition unit 2 that acquires the approximate curvature C for each point on the surface α that is the design surface p The distribution map on the xy plane coordinates;

[0168] A z coordinate value acquisition unit 3 that multiplies the approximate curvature C at each point on the xy plane coordinates of the distribution map p By the weight w corresponding to each point on the weight map p To obtain the z coordinate value z through the formula 1 addp ;

[0169] A design unit 4 that designs a new surface α′ based on the z coordinate value z obtained by the z coordinate acquisition unit addp The content performed by the weight map acquisition unit 1 is the same as the above weight map acquisition process, so the description is omitted. The content performed by the approximate curvature map acquisition unit 2 is the same as the above approximate curvature map acquisition process, so the description is omitted. The content performed by the z coordinate value acquisition unit 3 is the same as the above z coordinate value acquisition process, so the description is omitted. The content performed by the design unit 4 is the same as the above design process, so the description is omitted.

[0170] The weight map acquisition unit 1, the approximate curvature map acquisition unit 2, the z coordinate value acquisition unit 3, and the design unit 4 (and the linear weight map production unit 1a, the planar weight map production unit 1b, the planar weight map adjustment unit 1c, the determination unit 5, and the redesigned unit 6 described later) can either have their functions performed by the operation unit in the computer or be performed by the control computer unit including the operation unit.

[0171] The control computer unit has the function of a computer device that performs information processing instructed by a specified program. Specifically, it is composed of a combination of a CPU (Central Processing Unit), an HDD (Hard Disk Drive), a ROM (Read Only Memory), a RAM (Random Access Memory), an external interface (I / F), etc.

[0172]

[0173] The progressive mode change system 10 of the progressive refractive power lens according to one embodiment of the present invention preferably further has the following structure.

[0174] "The weight map acquisition unit 1 includes: ​

[0175] A linear weight map generating unit 1a, which obtains a change ratio of the joining curve of the progressive method 2 from the progressive starting point to the near diopter measurement reference point on the xy plane coordinates relative to the joining curve of the progressive method 1, based on the distance from the progressive starting point to the near diopter measurement reference point on the xy plane coordinates;

[0176] A planar weight map generating unit 1b, which develops the relationship between the distance and the change ratio obtained by the linear weight map generating unit on an xy plane coordinate with the asymptotic starting point as rotational symmetry;

[0177] The planar weight map adjusting unit 1c changes the change ratio above the asymptotic start point in the planar weight map obtained by the planar weight map creating unit to 1, and smoothes discontinuity of the planar weight map caused by the change to maintain continuity.

[0178] The progressive-addition lens changing system 10 according to one aspect of the present invention preferably further has the following configuration.

[0179] A determination unit 5 is configured to determine the difference between the added degree and the multiplication factor of the weight w in the surface α′ designed by the design unit. p Whether the difference in the added power in the previous surface α exceeds the threshold, and the curvature of the far vision zone in the surface α′ designed by the design unit is multiplied by the weight w p Does the difference in curvature of the distance zone in the surface α exceed at least one of the thresholds?

[0180] A redesign unit 6, which obtains a new z coordinate value z of each point according to the above formula 2 when the determination unit determines that the value exceeds the threshold. p (x, y), design each point to have the z coordinate value z p α″

[0181] The technical concept of the present invention can also be applied to a program for a progressive-addition lens progressive-power lens changing system 10. An example of its structure is as follows.

[0182] "A system for changing the progressive mode of a progressive refractive power lens, the progressive refractive power lens having an object-side surface and an eyeball-side surface, and having a near zone for visually recognizing objects at a near distance, a far zone for visually recognizing objects farther than the near distance, and a transition zone between the two zones for gradually increasing the refractive power, wherein a computer is used as a weight map acquisition unit 1, an approximate curvature map acquisition unit 2, a z-coordinate value acquisition unit 3, and a design unit 4,

[0183] The weight map acquisition unit 1 obtains a weight map on the xy-plane coordinates for changing from progressive mode 1 to progressive mode 2, that is, a weight map having continuity in all directions on the xy-plane coordinates.

[0184] The approximate curvature map acquisition unit 2 acquires the approximate curvature C for each point on the surface α as the design surface. p The distribution map on the xy-plane coordinates.

[0185] The z-coordinate value acquisition unit 3 multiplies the approximate curvature C at each point on the xy-plane coordinates of the distribution map p by the weight w corresponding to each point on the weight map p and obtains the z-coordinate value z through the above formula 1. addp ,

[0186] The design unit 4 designs a new surface α′ based on the z-coordinate value z obtained by the z-coordinate acquisition unit. addp Designs a new surface α′.

[0187] The program for the progressive power lens progressive mode change system 10 according to an aspect of the present invention preferably causes a computer to function as the above-described linear weight map production unit 1a, planar weight map production unit 1b, planar weight map adjustment unit 1c, determination unit 5, and redesign unit 6.

[0188] Examples

[0189] Hereinafter, the present invention will be specifically described using examples of the present invention, but the present invention is not limited by any of the following examples.

[0190] <Reference Example 1>

[0191] As the object of the smoothing process step for implementing an aspect of the present invention, instead of preparing a specific outer surface or inner surface, a progressive refracting surface is prepared as the design surface. This progressive refracting surface is a surface corresponding to the original progressive refracting surface in WO97 / 019382. The specific method of causing the original progressive refracting surface to fall on the surface of the lens may be the method described in this publication.

[0192] Figure 3 Is the joining curve of Reference Example 1 (solid line), Example 1 (ADD reduced by 10%) (dotted line), and Example 2 (ADD increased by 10%) (dashed line).

[0193] Figure 4A Is the average power distribution map of the progressive refractive surface in Reference Example 1.

[0194] Figure 4B Is the astigmatism distribution map of the progressive refracting surface in Reference Example 1.

[0195] The pitch of the average power distribution map and the astigmatism distribution map described later is 0.25 D.

[0196] In the progressive refractive surface of Reference Example 1, the spherical power S is set to 0 D, the astigmatic power C is set to 0 D, and the addition power ADD is set to 2.00 D. An approximate curvature map of the progressive refractive surface is also obtained.

[0197] <Example 1>

[0198] Based on the method for changing the progressive mode of the progressive refractive power lens described as one aspect of the present invention, with respect to the progressive refractive surface of Reference Example 1 (progressive mode 1), it is changed to a state (progressive mode 2) in which the addition power ADD is reduced by 10%. The details of the weight map acquisition process are described below.

[0199] Figure 5 This is a diagram showing the linear weight map in Example 1 (lower side) and Example 2 (upper side) together with the addition curve of Reference Example 1. The left vertical axis represents the refractive power (D) of the addition curve, the right vertical axis represents the weight value, and the horizontal axis represents the distance (mm) from the progressive start point to the near vision power measurement reference point on the xy plane coordinates. The weight represents the change ratio of the addition curve of progressive mode 2 to the addition curve of progressive mode 1 from the progressive start point to the near vision power measurement reference point on the xy plane coordinates. In this way, the linear weight map production process S1a is performed.

[0200] Figure 6 This is a planar weight map obtained by expanding the linear weight map in Example 1 with rotational symmetry about the progressive start point on the xy plane coordinates. The horizontal axis (left - right direction of the paper) is the x - axis, the vertical axis (up - down direction of the paper) is the y - axis, and the three - dimensional direction is the t - axis (w p )). In this way, the planar weight map production process S1b is performed.

[0201] Figure 7 This is a diagram showing the case where in the planar weight map of Example 1, above the horizontal line (x - axis direction) passing through the progressive start point (in the +y direction), the above - mentioned change ratio is changed to 1, and the discontinuity of the above - mentioned planar weight map caused by this change is smoothed to maintain continuity. In this way, the planar weight map adjustment process S1c is performed.

[0202] Specifically, in the planar weight map adjustment process S1c, the xy plane coordinates in the above - mentioned planar weight map are converted to polar coordinates, and for the term of the above - mentioned change ratio in the function constituting the above - mentioned planar weight map, it is multiplied by 0 when the polar coordinate is 0 ≤ θ < π, and multiplied by sin2θ when the polar coordinate is π ≤ θ < 2π, to smooth the discontinuity of the above - mentioned planar weight map and maintain continuity.

[0203] The z - coordinate value acquisition process S3 and the design process S4 are performed. In the z - coordinate value acquisition process S3, the approximate curvature Cp of each point on the xy - plane coordinates of the distribution map is multiplied by the weight w corresponding to each point on the weight map p , and the z - coordinate value z is obtained through the following formula addp . In the design process S4, a new surface α′ is designed based on the z - coordinate value z obtained through the z - coordinate value acquisition process S3 addp .

[0204] Figure 8A is the average degree distribution map of the progressive refractive surface in Example 1

[0205] Figure 8B is the astigmatism distribution map of the progressive refractive surface in Example 1

[0206] In this embodiment, the shape of the addition profile can be easily changed without causing design defects. This is because the approximate curvature is used. In other words, this means that through a parameter such as the approximate curvature, a progressive change can be made without worrying about design defects associated with the change in the progressive mode of the progressive power lens. The same effect applies to the embodiments described later

[0207] <Example 2>

[0208] In this embodiment, relative to the progressive refractive surface (progressive mode 1) of Reference Example 1, it is changed to a state (progressive mode 2′) in which the addition power ADD is increased by 10%. Other than this, it is assumed to be the same as in Example 1

[0209] As Figure 5 shown, a linear weight map production process S1a is performed

[0210] Figure 9 is a planar weight map obtained by expanding the linear weight map in Example 2 with rotational symmetry about the progressive start point on the xy - plane coordinates. The horizontal axis (left - right direction of the paper) is the x - axis, the vertical axis (up - down direction of the paper) is the y - axis, and the three - dimensional direction is the t - axis (w p ). In this way, a planar weight map production process S1b is performed

[0211] Figure 10 is a diagram showing a case where in the planar weight map of Example 2, above the horizontal line (x - axis direction) passing through the progressive start point (in the +y direction), the above - mentioned change ratio is changed to 1, and the discontinuity of the above - mentioned planar weight map caused by this change is smoothed to maintain continuity. In this way, a planar weight map adjustment process S1c is performed

[0212] Specifically, in the planar weight map adjustment step S1c, the xy-plane coordinates in the above planar weight map are converted into polar coordinates, and for the term of the above variation ratio in the function constituting the above planar weight map, it is multiplied by 0 when the polar coordinates are 0 ≤ θ < π, and it is multiplied by sin2θ when the polar coordinates are π ≤ θ < 2π, so as to smooth the discontinuity of the above planar weight map while maintaining continuity.

[0213] The z-coordinate value acquisition step S3 and the design step S4 are performed. In the z-coordinate value acquisition step S3, the approximate curvature Cp of each point on the xy-plane coordinates of the distribution map is multiplied by the weight w corresponding to each point on the weight map. p , and the z-coordinate value z is obtained through the following formula addp , and in the design step S4, a new surface α′ is designed based on the z-coordinate value z obtained through the z-coordinate value acquisition step S3. addp

[0214] Figure 11A is the average degree distribution map of the progressive refractive surface in Example 1.

[0215] Figure 11B is the astigmatism distribution map of the progressive refractive surface in Example 2.

[0216] In this embodiment, no design defects are generated, and the shape of the added configuration file can be easily changed. In addition, in Example 1, a relatively wide clear vision area (an area where the astigmatism is 0.25 D or less) is obtained at the part where the distance vision area is connected to the transition area, and in Example 2, a relatively wide clear vision area is obtained at the part where the near vision area is connected to the transition area.

[0217] Reference numerals

[0218] 10… Change system for the progressive manner of the progressive refractive power lens

[0219] 1… Weight map acquisition unit;

[0220] 1a… Linear weight map production unit

[0221] 1b… Planar weight map generation unit

[0222] 1c… Planar weight map adjustment unit

[0223] 2… Approximate curvature map acquisition unit

[0224] 3… Z-coordinate value acquisition unit

[0225] 4… Design unit

[0226] 5… Judgment unit

[0227] 6… Redesign unit

Claims

1. A method for changing the progressive power pattern of a progressive power lens, the progressive power lens having an object-side surface and an eye-side surface, and having a near vision zone for visually recognizing an object at a near distance, a distance vision zone for visually recognizing an object at a distance farther than the near distance, and a transition zone for gradually changing the refractive power between the two zones, wherein the method for changing the progressive power pattern of the progressive power lens is characterized in that when in a spectacle-wearing state, with the axis passing through the center of the lens from the object side towards the eye side being the z-axis, the axis from the bottom towards the top and orthogonal to the z-axis being the y-axis, and the axis from the left towards the right and orthogonal to the z-axis being the x-axis, it has: a weight map acquisition step of obtaining a weight map on the xy plane coordinates for changing from progressive power pattern 1 to progressive power pattern 2, that is, a weight map having continuity in all directions on the xy plane coordinates; Approximate curvature map acquisition process for obtaining the approximate curvature C for each point on the surface α as the design surface p Distribution map on the xy plane coordinates; z - coordinate value acquisition process, for the approximate curvature C of each point on the xy - plane coordinates of the distribution map p multiply by the weight w corresponding to each point on the weight map p , and obtain the z - coordinate value z through the following formula addp [Equation 1] Design process, based on the z - coordinate value z obtained by the process of obtaining the process through the z - coordinate value addp Design a new plane α′ Among them, The approximate curvature C p is defined as follows: The approximate curvature C of an arbitrary point p(x, y, z) on the plane α p using the reciprocal of the radius of a circle passing through the point p and the points p'(-x, -y, z) and (0, 0, z) that are rotationally symmetric to the point p in the xy plane perpendicular to the z-axis In the case where the point p is (0, 0, 0), the approximate curvature C p uses the average of the two principal curvatures of the point p on the surface α.

2. The method for changing the progressive power pattern of the progressive power lens according to claim 1, wherein, The weight map acquisition step includes: a linear weight map production step of obtaining, based on the distance on the xy plane coordinates from the progressive start point to the near vision power measurement reference point, the change ratio of the addition curve of progressive power pattern 2 to the addition curve of progressive power pattern 1 on the xy plane coordinates from the progressive start point to the near vision power measurement reference point; a planar weight map production step of expanding, with the progressive start point as the rotational symmetry center, the relationship between the distance and the change ratio obtained in the linear weight map production step on the xy plane coordinates; a planar weight map adjustment step of, in the planar weight map obtained in the planar weight map production step, changing the change ratio to 1 above the progressive start point and smoothing the discontinuity of the planar weight map resulting from this change while maintaining continuity.

3. The method for changing the progressive power pattern of a progressive power lens according to claim 2, wherein In the planar weight map adjustment process, the xy-plane coordinates in the planar weight map are converted into polar coordinates, and for the term of the change ratio in the function constituting the planar weight map, it is multiplied by 0 when the polar coordinates are 0 ≤ θ < π, and multiplied by sin 2 θ when the polar coordinates are π ≤ θ < 2π, so as to smooth the discontinuity of the planar weight map and maintain continuity.

4. The method for changing the progressive power pattern of a progressive power lens according to claim 1 or 2, wherein when changing from progressive power pattern 1 to progressive power pattern 2, the change ratio of the changed addition power to the addition power before the change is less than 0.

125.

5. The method for changing the progressive power pattern of a progressive power lens according to claim 1 or 2, wherein the near vision zone is a region where the refractive power is the spherical power S + addition power ADD - 0.12D or more, the distance vision zone is a part for visually recognizing an object at a distance farther than the near distance and is a region where the refractive power is within the range of the spherical power S ± 0.12D.

6. The method for changing the progressive power pattern of a progressive power lens according to claim 5, wherein There is a determination step that determines whether the difference between the addition power in the surface α' designed by the design step and the addition power in the surface α before multiplying by the weight w p exceeds a threshold value, and whether the difference between the curvature of the distance vision area in the surface α' designed by the design step and the curvature of the distance vision area in the surface α before multiplying by the weight w p exceeds a threshold value, for at least either one of them. When it is determined in the determination step that the value exceeds the threshold, the new z-coordinate value z of each point is obtained by the following formula p for (x, y), and a redesign step of designing a surface α″ having the z-coordinate value z at each point is performed p ​ [Equation 2] C fb is multiplied by the weight w p the curvature of the previous distance vision zone, C nb is multiplied by the weight w p the curvature of the previous near vision zone, C fa is multiplied by the weight w p the curvature of the subsequent distance vision zone, C na is multiplied by the weight w p the curvature of the subsequent near vision zone.

7. A method for changing the progressive power pattern of a progressive power lens, the progressive power lens having an object-side surface and an eye-side surface, and having a near vision zone for visually recognizing an object at a near distance, a distance vision zone for visually recognizing an object at a distance farther than the near distance, and a transition zone for gradually changing the refractive power between the two zones, wherein the method for changing the progressive power pattern of the progressive power lens is characterized in that In the state of wearing glasses, when the axis passing through the center of the lens from the object side toward the eyeball side is defined as the z-axis, the axis from the lower side toward the upper side and orthogonal to the z-axis is defined as the y-axis, and the axis from the left side toward the right side and orthogonal to the z-axis is defined as the x-axis, it has: A weight map acquisition step of obtaining a weight map on the xy-plane coordinates for changing from progressive mode 1 to progressive mode 2, that is, a weight map having continuity in all directions on the xy-plane coordinates; A z coordinate value map acquisition step of obtaining a distribution map of the z coordinate values on the xy-plane coordinates for each point on the surface α as the design surface; z - coordinate value acquisition process, multiplying the z - coordinate value on the xy - plane coordinates of the distribution map by the weight w corresponding to each point on the weight map p , obtaining the z - coordinate value z addp ; Design process, based on the z - coordinate value z obtained by the process of obtaining the process through the said z - coordinate value addp Design a new surface α'.

8. A system for changing the progressive mode of a progressive refractive power lens, the progressive refractive power lens having a surface on the object side and a surface on the eyeball side, and having a near vision area for visually recognizing an object at a short distance, a distance vision area capable of visually recognizing an object farther than the short distance, and a transition area where the refractive power gradually changes between the two. The system for changing the progressive mode of the progressive refractive power lens is characterized in that In the state of wearing glasses, when the axis passing through the center of the lens from the object side toward the eyeball side is defined as the z-axis, the axis from the lower side toward the upper side and orthogonal to the z-axis is defined as the y-axis, and the axis from the left side toward the right side and orthogonal to the z-axis is defined as the x-axis, it has: A weight map acquisition unit that obtains a weight map on the xy-plane coordinates for changing from progressive mode 1 to progressive mode 2, that is, a weight map having continuity in all directions on the xy-plane coordinates; An approximate curvature map acquisition unit that acquires a distribution map of the approximate curvature C at each point on the surface α as a design surface; p on the xy plane coordinates; A z - coordinate value acquisition unit that calculates, for each point on the xy - plane coordinates of the distribution map, an approximate curvature C p multiplied by a weight w corresponding to the point on the weight map p , and obtains a z - coordinate value z through the following formula addp ; [Equation 3] The design department designs a new plane α′ based on the z coordinate value z obtained by the z coordinate value acquisition unit. addp Design a new plane α′. Among them, The approximate curvature C p is defined as follows: The approximate curvature C of an arbitrary point p(x, y, z) on the plane α p Use the reciprocal of the radius of the circle passing through the point p and the points p'(-x, -y, z) and (0, 0, 0) which is rotationally symmetric to the point p in the xy plane perpendicular to the z-axis. Among them, when the point p is (0, 0, 0), the approximate curvature C p uses the average of the two principal curvatures of the point p in the plane α.

9. The progressive power lens progressive change system according to claim 8, characterized in that, The weight map acquisition unit includes: A linear weight map production unit that obtains, based on the distance on the xy-plane coordinates from the progressive start point to the near vision degree measurement reference point, the change ratio of the joining curve of progressive mode 2 to the joining curve of progressive mode 1 on the xy-plane coordinates; A planar weight map production unit that expands, with the progressive start point as the center of rotational symmetry, the relationship between the distance and the change ratio obtained by the linear weight map production unit on the xy-plane coordinates; A planar weight map adjustment unit that, in the planar weight map obtained by the planar weight map production unit, changes the change ratio to 1 above the progressive start point and smooths the discontinuity of the planar weight map generated by this change to maintain continuity.

10. The progressive power lens progressive change system according to claim 8 or 9, characterized in that, It includes: A determination unit that determines whether the difference between the addition degree in the surface α' designed by the design unit and the addition degree in the surface α before multiplying by the weight w exceeds a threshold value, and whether the difference between the curvature of the distance vision area in the surface α' designed by the design unit and the curvature of the distance vision area in the surface α before multiplying by the weight w exceeds a threshold value, for at least either one of them; p whether the difference between the addition degree in the surface α' designed by the design unit and the addition degree in the surface α before multiplying by the weight w exceeds a threshold value, and whether the difference between the curvature of the distance vision area in the surface α' designed by the design unit and the curvature of the distance vision area in the surface α before multiplying by the weight w exceeds a threshold value; p for at least either one of them The redesign department, when it is determined in the determination department that the value exceeds the threshold, obtains the new z-coordinate value z of each point through the above formula p (x, y), and designs the surface α″ where each point has the z-coordinate value z p of the surface α″.

11. A program for a system for changing the progressive mode of a progressive refractive power lens, the progressive refractive power lens having a surface on the object side and a surface on the eyeball side, and having a near vision area for visually recognizing an object at a short distance, a distance vision area capable of visually recognizing an object farther than the short distance, and a transition area where the refractive power gradually changes between the two. The program for the system for changing the progressive mode of the progressive refractive power lens is characterized in that In the state of wearing glasses, when the axis passing through the center of the lens from the object side toward the eyeball side is defined as the z-axis, the axis from the lower side toward the upper side and orthogonal to the z-axis is defined as the y-axis, and the axis from the left side toward the right side and orthogonal to the z-axis is defined as the x-axis, it causes a computer to function as a weight map acquisition unit, an approximate curvature map acquisition unit, a z coordinate value acquisition unit, and a design unit. The weight map acquisition unit obtains a weight map on the xy plane coordinates for changing from progressive mode 1 to progressive mode 2, that is, a weight map that is continuous in all directions on the xy plane coordinates. The approximate curvature map acquisition unit acquires a distribution map of the approximate curvature C for each point on the surface α that is the design surface p on the xy-plane coordinates, The z - coordinate value acquisition unit multiplies the approximate curvature C at each point on the xy - plane coordinates of the distribution map p by the weight w corresponding to each point on the weight map p to obtain the z - coordinate value z through the following formula addp [Equation 4] The design department designs a new plane α' based on the z coordinate value z obtained by the z coordinate value acquisition unit. addp ​ Among them, The approximate curvature Cp is defined as follows: The approximate curvature C of any point p(x, y, z) on the plane α p using the reciprocal of the radius of a circle passing through the point p and the points p'(-x, -y, z) and (0, 0, z) which are rotationally symmetric to the point p in the xy plane perpendicular to the z-axis In the case where the point p is (0, 0, 0), the approximate curvature C p uses the average of the two principal curvatures of the point p in the plane α.

12. A program for a system for changing the progressive manner of a progressive refractive power lens according to claim 11, characterized in that, The weight map acquisition unit includes: A linear weight map production unit that obtains, based on the distance on the xy plane coordinates from the progressive start point to the near power measurement reference point, the change ratio of the addition curve of progressive mode 2 to the addition curve of progressive mode 1 on the xy plane coordinates from the progressive start point to the near power measurement reference point. A planar weight map production unit that expands, with the progressive start point as the rotational symmetry, the relationship between the distance and the change ratio obtained by the linear weight map production unit on the xy plane coordinates. A planar weight map adjustment unit that, in the planar weight map obtained by the planar weight map production unit, changes the change ratio to 1 above the progressive start point and smooths the discontinuity of the planar weight map resulting from this change to maintain continuity.

13. A program for a progressive refractive power lens progressive mode change system according to claim 11 or 12, characterized in that it causes a computer to function as a determination unit and a redesign unit. The determination unit determines whether the difference between the addition degree in the surface α' designed by the design unit and the addition degree in the surface α before multiplying by the weight w p exceeds a threshold value, and whether the difference between the curvature of the distance vision area in the surface α' designed by the design unit and the curvature of the distance vision area in the surface α before multiplying by the weight w p exceeds a threshold value, for at least either one of them. When the redesign department determines in the determination department that it exceeds the threshold, the new z-coordinate value z of each point is obtained by the formula p of (x, y), and it is designed that each point has the z-coordinate value z p of the surface α″.

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