Method for changing the progressive mode of a progressive power lens, system for changing the progressive mode of a progressive power lens, and program for the system for changing the progressive mode of a progressive power lens

Abstract

To easily change the shape of a participation profile without causing a failure in a design.SOLUTION: A method for changing the progressive mode of a progressive power lens includes: a weight map acquisition step of obtaining a weight map on xy plane coordinates to change a progressive mode 1 to a progressive mode 2, the weight map having continuity in all directions on the xy plane coordinates; a z-coordinate value acquisition step of obtaining a coordinate value zaddp by multiplying an approximate curvature Cp on the xy plane coordinates for each point on a surface α as a design surface by a weight wp for each point of the weight map; and a design step of designing a new surface α' on the basis of the z-coordinate value zaddp obtained by the z-coordinate acquisition step. There is also provided a related technique of the method.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for changing the progressive mode of a progressive power lens, a system for changing the progressive mode of a progressive power lens, and a program for the system for changing the progressive mode of a progressive power lens. [Background technology]

[0002] Claim 1 of Patent Document 1 describes a progressive power lens in which a power exceeding zero is added to the prescribed power of a specific region so that a predetermined portion of the intermediate region has a power corresponding to a preset target distance between a near distance and the far distance. As described in Patent Document 1, the technology for adjusting the relationship between the distance on the main line of gaze and the add power is publicly known. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] WO2016 / 047712 Brochure Summary of the Invention [Problem to be solved by the invention]

[0004] In this specification, this relationship is also referred to as an "addition profile." Changing the shape of this addition profile is not easy. If the shape of the addition profile is changed, changes will naturally occur in areas other than the main gaze. As a result, it is necessary to confirm using an astigmatism distribution diagram and a power distribution diagram that no disruption has occurred in the astigmatism distribution and power distribution over the entire spectacle lens when the shape of the addition profile is changed (i.e., no disruption has occurred in the design of the progressive addition lens). Moreover, this confirmation must be performed every time the shape of the addition profile is changed.

[0005] Depending on the wearer of the progressive power lens, there are cases where it is better to make the change in power gentler in the vicinity of the near portion in the intermediate portion, and conversely, there are cases where it is better to make the change in power greater in the vicinity of the near portion in the intermediate portion, while making the change in power gentler in the vicinity of the distance portion in the intermediate portion. In other words, the inventor has found the problem that it is desired to be able to change the addition profile more easily depending on the wearer than in the situation described in the above paragraph.

[0006] An embodiment of the present invention aims to easily change the shape of a joining profile without causing design problems. [Means for solving the problem]

[0007] In order to solve the above problem, the inventors have found that in one embodiment of the present invention, a weight map on an xy plane coordinate system for changing from progressive mode 1 to progressive mode 2, which is continuous in all directions on the xy plane coordinate system, is multiplied by an approximate curvature or z coordinate value at each point, which will be described in detail later. The following embodiments have been created based on this finding.

[0008] A first aspect of the present invention is A method for changing the progressive power mode of a progressive power lens having an object-side surface and an eyeball-side surface, a near portion for visually recognizing objects at a near distance, a distance portion in which objects at a distance greater than the near distance can be visually recognized, and an intermediate portion for progressively increasing refractive power between the near and distance portions, comprising: When wearing glasses, the axis passing through the lens center from the object side toward the eyeball side is the z-axis, the axis from bottom to top that is perpendicular to the z-axis is the y-axis, and the axis from left to right that is perpendicular to the z-axis is the x-axis. a weight map acquisition step of acquiring a weight map on an xy plane coordinate system for changing from progressive mode 1 to progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; Approximate curvature C for each point on the design surface α p an approximate curvature map acquisition step of acquiring a distribution map on the xy plane coordinates of Approximate curvature C at each point on the xy plane coordinates of the distribution map p , the weight w corresponding to each point on the weight map p and calculate the z coordinate value z using the following formula: addp A z-coordinate value acquisition step for obtaining the z-coordinate value;

number

[0009] A second aspect of the present invention is The weight map acquisition step includes: a linear weight map creation step for obtaining a change rate of the addition curve of the progressive mode 2 relative to the addition curve of the progressive mode 1 from the progressive start point on the xy plane coordinate to the reference point for measuring near power according to the distance from the progressive start point on the xy plane coordinate to the reference point for measuring near power; a planar weight map creation process in which the relationship between the distance and the change rate obtained in the linear weight map creation process is expanded onto an xy plane coordinate system with rotational symmetry about the progressive start point; A surface weight map adjustment process in which the change rate is changed to 1 above the progressive start point in the surface weight map obtained in the surface weight map creation process, and discontinuities in the surface weight map that occur due to the change are smoothed to maintain continuity; The method for changing the progressive power mode of the progressive power lens according to the first aspect of the present invention comprises:

[0010] A third aspect of the present invention is In the surface weight map adjustment process, while converting the xy plane coordinates in the surface weight map into polar coordinates, the term relating to the rate of change in the function constituting the surface weight map is multiplied by 0 when the polar coordinates are 0≦θ<π, and by sin when the polar coordinates are π≦θ<2π. 2 θ to smooth out discontinuities in the planar weight map and maintain continuity.

[0011] A fourth aspect of the present invention is When changing from progressive mode 1 to progressive mode 2, the add power before the change against The new addition rate The progressive bending index lens according to any one of the first to third aspects, wherein the rate of change in the number is less than 0.125. A method for changing the progressive mode of a refractive power lens.

[0012] A fifth aspect of the present invention is The near portion is a region having a refractive power of (spherical power S+addition power ADD-0.12D) or more, This is a method for changing the progressive power mode of a progressive power lens according to any one of the first to fourth modes, wherein the distance portion is a portion for visually recognizing objects that are farther away than a near distance and is a region having refractive power within a range of (spherical power S±0.12D).

[0013] A sixth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The addition power and weight w of the surface α' designed by the design process p Whether the difference between the addition power at the surface α before multiplication exceeds a threshold value; and The curvature of the distance portion of the surface α' designed in the design process and the weight w p whether the difference between the curvature of the distance portion on the surface α before multiplication and the curvature of the distance portion on the surface α before multiplication exceeds a threshold value; a determination step of determining at least one of the following: If it is determined in the determination step that the threshold value is exceeded, the new z coordinate value z of each point is calculated by the following formula:p (x,y) and each point has the z coordinate value z p The method for changing the progressive power mode of the progressive power lens according to the fifth aspect includes a redesigning step of designing a surface α″ comprising:

number

[0014] A seventh aspect of the present invention is A method for changing the progressive power mode of a progressive power lens having an object-side surface and an eyeball-side surface, a near portion for visually recognizing objects at a near distance, a distance portion in which objects at a distance greater than the near distance can be visually recognized, and an intermediate portion for progressively increasing refractive power between the near and distance portions, comprising: When wearing glasses, the axis passing through the lens center from the object side toward the eyeball side is the z-axis, the axis from bottom to top that is perpendicular to the z-axis is the y-axis, and the axis from left to right that is perpendicular to the z-axis is the x-axis. a weight map acquisition step of acquiring a weight map on an xy plane coordinate system for changing from progressive mode 1 to progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; a z-coordinate value map acquisition step of acquiring a distribution map of z-coordinate values ​​on an xy plane coordinate system for each point on a surface α that is a design surface; The weight w corresponding to each point on the weight map is assigned to the z coordinate value on the xy plane coordinate of the distribution map. p Multiply by z coordinate value z addp A z-coordinate value acquisition step for obtaining the z-coordinate value; The z-coordinate value z obtained in the z-coordinate value acquisition step addp a design process of designing a new surface α' based on the The method for changing the progressive mode of a progressive-power lens is as follows.

[0015] An eighth aspect of the present invention is A system for changing the progressive mode of a progressive power lens, the progressive power lens having an object-side surface and an eyeball-side surface, a near portion for visually recognizing an object at a near distance, a distance portion in which an object at a distance farther than the near distance can be visually recognized, and an intermediate portion for progressively increasing refractive power between the near portion and the distance portion, When wearing glasses, the axis passing through the lens center from the object side toward the eyeball side is the z-axis, the axis from bottom to top that is perpendicular to the z-axis is the y-axis, and the axis from left to right that is perpendicular to the z-axis is the x-axis. a weight map acquisition unit that acquires a weight map on an xy plane coordinate system for changing from progressive mode 1 to progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; Approximate curvature C for each point on the design surface α p an approximate curvature map acquisition unit that acquires a distribution map on the xy plane coordinate system of Approximate curvature C at each point on the xy plane coordinates of the distribution map p , the weight w corresponding to each point on the weight map p and calculate the z coordinate value z using the following formula: addp A z-coordinate value acquisition unit that obtains

number

[0016] A ninth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The weight map acquisition unit a linear weight map creating unit that obtains a change rate of the addition curve of the progressive mode 2 relative to the addition curve of the progressive mode 1 from the progressive start point on the xy plane coordinate to the reference point for measuring near power according to the distance from the progressive start point on the xy plane coordinate to the reference point for measuring near power; a surface weight map creation unit that develops the relationship between the distance and the change rate obtained by the linear weight map creation unit on an xy plane coordinate system with rotational symmetry about the progressive start point; A surface weight map adjustment unit that changes the change rate to 1 above the progressive start point in the surface weight map obtained by the surface weight map creation unit, and smooths discontinuities in the surface weight map that occur due to the change to maintain continuity; The system for changing the progressive power of a progressive power lens according to an eighth aspect is provided with:

[0017] A tenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The addition power and weight w of the surface α' designed by the design department p Whether the difference between the addition power at the surface α before multiplication exceeds a threshold value; and The curvature of the distance portion of the surface α′ designed by the design department and the weight w p whether the difference between the curvature of the distance portion on the surface α before multiplication and the curvature of the distance portion on the surface α before multiplication exceeds a threshold value; a determination unit that determines at least one of the above; If the determination unit determines that the threshold value is exceeded, the new z coordinate value z of each point is calculated by the formula. p (x,y) and each point has the z coordinate value z p a redesign unit that designs a surface α′ having the surface α′; A system for changing the progressive power aspect of a progressive power lens according to the eighth or ninth aspect, comprising:

[0018] An eleventh aspect of the present invention is a method for manufacturing a semiconductor device comprising: A program for a system for changing the progressive mode of a progressive power lens, the progressive power lens having an object-side surface and an eyeball-side surface, a near portion for visually recognizing objects at a near distance, a distance portion in which objects at a distance farther than the near distance can be visually recognized, and an intermediate portion for progressively increasing refractive power between the near portion and the distance portion, When wearing glasses, the axis passing through the lens center from the object side toward the eyeball side is the z-axis, the axis from bottom to top that is perpendicular to the z-axis is the y-axis, and the axis from left to right that is perpendicular to the z-axis is the x-axis. a weight map acquisition unit that acquires a weight map on an xy plane coordinate system for changing from progressive mode 1 to progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; Approximate curvature C for each point on the design surface α p an approximate curvature map acquisition unit that acquires a distribution map on the xy plane coordinate system; Approximate curvature C at each point on the xy plane coordinates of the distribution map p , the weight w corresponding to each point on the weight map p and calculate the z coordinate value z using the following formula: addp A z-coordinate value acquisition unit that obtains the z-coordinate value, and

number

[0019] A twelfth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The weight map acquisition unit a linear weight map creating unit that obtains a change rate of the addition curve of the progressive mode 2 relative to the addition curve of the progressive mode 1 from the progressive start point on the xy plane coordinate to the reference point for measuring near power according to the distance from the progressive start point on the xy plane coordinate to the reference point for measuring near power; a surface weight map creation unit that develops the relationship between the distance and the change rate obtained by the linear weight map creation unit on an xy plane coordinate system with rotational symmetry about the progressive start point; A surface weight map adjustment unit that changes the change rate to 1 above the progressive start point in the surface weight map obtained by the surface weight map creation unit, and smooths discontinuities in the surface weight map that occur due to the change to maintain continuity; A program for a system for changing the progressive power aspect of a progressive power lens according to an eleventh aspect, comprising:

[0020] A thirteenth aspect of the present invention is a method for manufacturing a semiconductor device comprising: The addition power and weight w of the surface α' designed by the design department p Whether the difference between the addition power at the surface α before multiplication exceeds a threshold value; and The curvature of the distance portion of the surface α′ designed by the design department and the weight w p whether the difference between the curvature of the distance portion on the surface α before multiplication and the curvature of the distance portion on the surface α before multiplication exceeds a threshold value; a determination unit that determines at least one of the above; and If the determination unit determines that the threshold value is exceeded, the new z coordinate value z of each point is calculated by the formula. p (x,y) and each point has the z coordinate value z p The program for the system for changing the progressive power mode of the progressive power lens according to the eleventh or twelfth aspect causes a computer to function as a redesign unit that designs a surface α″ comprising: [Effects of the Invention]

[0021] According to one embodiment of the present invention, the shape of the subscription profile can be easily changed without causing any design problems. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic flow diagram of a method for changing the progressive power of a progressive power lens, which is one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic block diagram of a system for changing the progressive power mode of a progressive power lens according to one embodiment of the present invention. [Figure 3] FIG. 3 shows the recruitment profiles of Reference Example 1 (solid line), Example 1 (10% reduction in ADD) (dashed line), and Example 2 (10% increase in ADD) (dotted line). [Figure 4A] FIG. 4A is a diagram showing the average power distribution of the progressive refractive surface in Reference Example 1. FIG. [Figure 4B] FIG. 4B is an astigmatism distribution diagram of the progressive refractive surface in Reference Example 1. [Figure 5] Figure 5 shows the linear weight maps for Example 1 (bottom) and Example 2 (top) together with the addition profile for Reference Example 1, where the left vertical axis represents the refractive power (D) of the addition profile, the right vertical axis represents the weight value, and the horizontal axis represents the distance (mm) from the progressive start point to the near power measurement reference point on the xy plane coordinate system. [Figure 6] Figure 6 is a planar weight map in which the linear weight map in Example 1 is expanded on the xy plane coordinate system with rotational symmetry about the progressive starting point, with the horizontal axis (left-right direction on the paper) being the x-axis, the vertical axis (up-down direction on the paper) being the y-axis, and the three-dimensional direction being the t-axis (wp). [Figure 7] FIG. 7 is a diagram showing how the change rate is changed to 1 above (in the +y direction) the horizontal line (in the x-axis direction) passing through the progressive starting point in the planar weight map in Example 1, while smoothing out the discontinuity of the planar weight map that occurs with the change to maintain continuity. [Figure 8A] FIG. 8A is a diagram showing the average power distribution of the progressive refractive surface in Example 1. [Figure 8B] FIG. 8B is an astigmatism distribution diagram of the progressive refractive surface in Example 1. [Figure 9]Figure 9 is a planar weight map in which the linear weight map in Example 2 is expanded on the xy plane coordinate system with rotational symmetry about the progressive starting point, with the horizontal axis (left-right direction on the paper) being the x-axis, the vertical axis (up-down direction on the paper) being the y-axis, and the three-dimensional direction being the t-axis (wp). [Figure 10] FIG. 10 is a diagram showing how the change rate is changed to 1 above (in the +y direction) the horizontal line (in the x-axis direction) passing through the progressive start point in the planar weight map in Example 2, while smoothing out the discontinuity of the planar weight map that occurs with the change to maintain continuity. [Figure 11A] FIG. 11A is a diagram showing the average power distribution of the progressive refractive surface in Example 2. [Figure 11B] FIG. 11B is an astigmatism distribution diagram of the progressive refractive surface in Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described. The following explanation based on the drawings is an example, and the present invention is not limited to the exemplified embodiments. In this specification, "to" indicates a value greater than or equal to a predetermined value and less than or equal to a predetermined value.

[0024] <Definition> The spectacle lenses mentioned in this specification have an object-side surface and an eyeball-side surface. The "object-side surface" is the surface that is located on the object side when a wearer wears spectacles equipped with the spectacle lens, and the "eyeball-side surface" is the opposite, i.e., the surface that is located on the eyeball side when a wearer wears spectacles equipped with the spectacle lens. The object-side surface may also be called the outer surface, and the eyeball-side surface may also be called the inner surface.

[0025] In this specification, the left-right direction when facing the outer surface of a spectacle lens (hereinafter referred to as plan view) is defined as the x-direction, the up-down direction as the y-direction, and the thickness direction of the spectacle lens, which is perpendicular to the x- and y-directions, as the z-direction. The z-direction is also the optical axis direction of the spectacle lens. The origin is the lens center. The lens center refers to the optical center or geometric center of the spectacle lens. In this specification, a case where the optical center and the geometric center approximately coincide is illustrated. The right (3 o'clock direction) is the +x direction, the left (9 o'clock direction) is the -x direction, the top (0 o'clock direction) is the +y direction, the bottom (6 o'clock direction) is the -y direction, the direction toward the object is the +z direction, and the opposite direction (toward the back) is the -z direction. The x direction is also called the x axis, the y direction is also called the y axis, and the z direction is also called the z axis. The content of this paragraph can be rephrased as follows: "When wearing eyeglass lenses, the axis passing through the center of the lens from the object side toward the eyeball is the z-axis, the axis extending from bottom to top and perpendicular to the z-axis is the y-axis, and the axis extending from left to right and perpendicular to the z-axis is the x-axis."

[0026] As an example of a spectacle lens according to one aspect of the present invention, a progressive-power lens is shown, which includes a near portion for viewing objects at a near distance, a distance portion for viewing objects at a distance greater than the near distance, and an intermediate portion between the near and distance portions for progressively increasing refractive power. Hereinafter, a spectacle lens that is a progressive-power lens will also be referred to simply as a "lens."

[0027] The near portion according to one embodiment of the present invention has a refractive power for viewing an object at a near distance. This refractive power is a near power, which is the sum of the spherical power S (distance power) and the added power ADD. When the power is measured at least at the near portion measurement reference point N, it is equal to or greater than the near power. The refractive power may be increased in the direction from the progressive start point toward the near portion measurement reference point N even after passing the near portion measurement reference point N, and the near portion refractive power may temporarily exceed the near power (so-called overshoot). In one embodiment of the present invention, the region with a refractive power equal to or greater than (near power -0.12D) is considered to be the near portion.

[0028] The distance portion according to one aspect of the present invention has a refractive power for viewing objects farther away than near distances. The refractive power is spherical power S (distance power). When the power is measured at least at the distance portion measurement reference point F, it is equal to or less than spherical power S. The distance portion according to one aspect of the present invention has a substantially constant refractive power. In one aspect of the present invention, an area whose refractive power is within the range of (spherical power S±0.12D) is considered to be the distance portion.

[0029] The refractive power gradually changes in the intermediate portion. The difference between the refractive power for viewing distant objects and the refractive power for viewing close objects is called the add power ADD (unit: D [diopter]; the same applies hereinafter to the refractive power and diopter described in this specification). In this specification, the term "refractive power" may be used instead of "diopter" or "power" to generally indicate the degree of refraction of a lens.

[0030] In the intermediate section, the refractive power changes continuously. This intermediate section can also be called the progressive zone. The progressive zone length is defined as the distance between the progressive start point where the refractive power change begins and the progressive end point where it ends.

[0031] The distance portion is the area of ​​the progressive power lens that is above the progressive power starting point and the near portion is the area of ​​the progressive power lens that generally includes the progressive power ending point and the area below it. The intermediate portion is the area between the distance portion and the near portion, where the refractive power changes progressively.

[0032] In one embodiment of the present invention, for ease of explanation, an example will be given in which the outer surface is a spherical or toric surface and the inner surface is a progressive surface (a so-called inner surface progressive lens). Of course, this is just one example, and the outer surface may also be a progressive surface. The progressive surface in one embodiment of the present invention has the following configuration.

[0033] On the inner surface of a lens according to one embodiment of the present invention, a near vision area for viewing at close distances (for example, 40 cm to 60 cm) is located on the lower side (-y direction) of the lens when the lens is worn.

[0034] On the other hand, in one aspect of the present invention, a distance portion for visually recognizing objects at a distance farther than the near distance is disposed above the near portion (in the +y direction). There are no particular limitations on the distance portion in one aspect of the present invention, and it may be for long distances (for example, 2 m to infinity) or for medium distances (for example, 60 cm to 200 cm).

[0035] In other words, a lens according to one embodiment of the present invention may be an intermediate-near lens that corresponds to an object distance from an intermediate distance (1 m to 40 cm) to a close distance (40 cm to 10 cm), or a near-near lens that corresponds within the close distance.

[0036] In one aspect of the present invention, for the sake of convenience of explanation, a case where the distance portion is a long distance area will be exemplified.

[0037] In addition, a near portion measurement reference point is set in the near portion to measure a reference power. Similarly, a distance portion measurement reference point is set in the distance portion to measure a reference power. The power here is the so-called spherical power S. The power at the near portion measurement reference point is (S + ADD (addition power)).

[0038] The "distance measurement reference point" refers to the point at which the spherical power and cylindrical power described in the prescription data of the wearer's information are given to the progressive-power lens. The spherical power refers to the so-called spherical power S (distance power S), and the cylindrical power refers to the so-called astigmatism power C. The distance measurement reference point (hereinafter simply referred to as measurement reference point F or point F) is, for example, located on the meridian, 8.0 mm away from the horizontal line connecting the positions of the two hidden marks on the distance side.

[0039] The "eye point (EP)" is the position through which the line of sight passes when looking straight ahead while wearing a progressive addition lens. It is generally located a few millimeters below the measurement reference point F. The change in refractive power occurs below this EP. The point where the change in progressive power begins is also called the progressive start point. In this embodiment, the geometric center GC, which is further below the EP, is aligned with the progressive start point, and also with the prism reference point.

[0040] The "near measurement reference point" refers to the point where the add power ADD is added to the spherical refractive power described in the prescription data of the wearer information, and is the point where the spherical power S+ADD is first realized when looking from above to below the lens. The near measurement reference point (hereinafter simply referred to as measurement reference point N or point N) is also located on the meridian.

[0041] Incidentally, the prescription data of the wearer's information is written on the lens bag of the progressive addition lens. In other words, if a lens bag is present, it is possible to identify the lens as a progressive addition lens based on the prescription data of the wearer's information. Progressive addition lenses are usually packaged with a lens bag. Therefore, the technical concept of the present invention is also reflected in progressive addition lenses that come with a lens bag, and the same applies to sets of progressive addition lenses and a lens bag.

[0042] The positions of the measurement reference point F, fitting point or eye point EP, and measurement reference point N can be specified by referring to a remark chart or centration chart issued by the lens manufacturer. The progressive start point can also be specified by using a lens meter for power measurement.

[0043] The "main line of gaze" is the locus of the line of gaze on the lens surface when looking straight at an object in the near, distance, and intermediate portions of a progressive power lens. The main line of gaze moves toward the nose in the intermediate and near portions. The distance of this movement toward the nose is called the amount of inward shift.

[0044] "Meridian" refers to a vertical line that intersects at right angles with the horizontal line connecting the positions of two hidden marks on a progressive addition lens and passes through the midpoint between the positions of the two hidden marks. The meridian corresponds to the y-axis of the distribution diagrams shown in the figures of this application.

[0045] <Method for changing the progressive power mode of a progressive power lens according to one aspect of the present invention> FIG. 1 is a schematic flow diagram of a method for changing the progressive power of a progressive power lens, which is one embodiment of the present invention.

[0046] A method for changing the progressive power of a progressive power lens according to one aspect of the present invention includes at least the following steps. A weight map acquisition step S1 for obtaining a weight map on the xy plane coordinate system for changing from the progressive mode 1 to the progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system. Approximate curvature C for each point on the surface α that is the design surface (for example, at least one of the two surfaces, the inner surface in one embodiment of the present invention) p Approximate curvature map acquisition step S2 to acquire a distribution map on the xy plane coordinates Approximate curvature C at each point on the xy plane coordinates of the distribution map p , the weight w corresponding to each point on the weight map p and calculate the z coordinate value z using the following formula: addp z coordinate value acquisition step S3

number

[0047] approximate curvature C p is defined as follows: Approximate curvature C of any point p(x, y, z) on the surface α pIn the xy plane perpendicular to the z axis, the inverse of the radius of the circle that passes through the three points p'(-x,-y,z) and (0,0,0) that are rotationally symmetric with respect to point p is used. However, if point p is (0,0,0), the approximate curvature C p is the average of the two principal curvatures of point p on the surface α. The "two principal curvatures" refer to the largest and smallest curvatures.

[0048] approximate curvature C p The distribution map of C on the xy plane coordinates may be called an "approximate curvature map." This approximate curvature map is p This is a distribution diagram with the value of σ as the third axis. 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, the s axis, like the z axis, is a normal to the xy plane, and the origin is the center of the lens.

[0049] The approximate curvature map may be obtained as a distribution map that can be specifically viewed visually, or may be obtained as a distribution map on the data.

[0050] The approximate curvature map may be one that has already been prepared. An approximate curvature map acquisition step S2 may be performed to acquire an already obtained approximate curvature map. Alternatively, when implementing one aspect of the present invention, the approximate curvature may be calculated from the x, y, and z coordinate values ​​of each point of an existing surface shape. An approximate curvature map acquisition step S2 may be performed to calculate the approximate curvature from the x, y, and z coordinate values ​​of each point of the surface α before smoothing.

[0051] The weight map according to one aspect of the present invention is used to assign weights to points corresponding to xy plane coordinates of the approximate curvature map. This weight map assigns weights w p This is a distribution diagram with the value of σ as the third axis. To distinguish it from the z axis described in <Definition>, this third axis is called the t axis. In one embodiment of the present invention, the t axis, like the z axis, is a normal line to the xy plane, and the origin is the center of the lens.

[0052] A weight map according to one embodiment of the present invention has continuity in all directions on the xy plane coordinate system, which means that the weight map can be expressed as continuous lines (straight or curved) on the three axes x, y, and t.

[0053] The weight map may be obtained as a distribution map that can be specifically viewed visually, or may be obtained as a distribution map on data.

[0054] The weight map according to one embodiment of the present invention may be a pre-existing one, or a weight map acquisition step S1 may be performed to acquire an already-existing weight map. Alternatively, a weight map acquisition step S1 may be performed to create a weight map using the method of one specific example below.

[0055] The weight map acquisition step S1 includes: a linear weight map creation step S1a for obtaining a change rate of the addition curve of the progressive mode 2 relative to the addition curve of the progressive mode 1 from the progressive start point on the xy plane coordinate to the reference point for measuring near power according to the distance from the progressive start point on the xy plane coordinate to the reference point for measuring near power; a planar weight map creation step S1b in which the relationship between the distance and the change rate obtained in the linear weight map creation step is expanded on an xy plane coordinate system with rotational symmetry about the progressive start point; A surface weight map adjustment process S1c in which the change rate is changed to 1 above the progressive start point (more specifically, above the horizontal line passing through the progressive start point, in another example, the distance portion) in the surface weight map obtained in the surface weight map creation process, and the discontinuity of the surface weight map occurring due to the change is smoothed to maintain continuity; may have

[0056] In the surface weight map adjustment step S1c, while converting the xy plane coordinates in the surface weight map into polar coordinates, the term relating to the rate of change in the function constituting the surface weight map is multiplied by 0 when the polar coordinates are 0≦θ<π, and by sin 2The discontinuity of the surface weight map may be smoothed by multiplying by θ to maintain continuity.

[0057] Although the above example has been given as one aspect of the present invention as a method for smoothing discontinuities in a surface weight map, the method is not limited thereto. For example, a smoothing filter process used in image processing may be performed. Also, B-spline smoothing or a known method for smoothing polygonal surfaces may be employed.

[0058] When changing from progressive mode 1 to progressive mode 2, it is preferable that the rate of change in the addition power after the change relative to the addition power before the change is less than 0.125, as this does not involve an unreasonable change.

[0059] In one aspect of the present invention, the z coordinate value z obtained in the z coordinate value acquisition step S3 addp A design step S4 is performed to design a new surface α' based on the above. The curved surface can be interpolated between each coordinate value (each point) using a known method (for example, spline interpolation). If the refractive index of the material used as the lens substrate is known, the refractive power at a predetermined location on the surface α' can also be determined.

[0060] In one aspect of the present invention, the design surface α is an inner progressive surface, but the present invention is not limited to this example. For example, the design surface α does not have to be a specific surface, but may be a virtual surface having a power distribution and an astigmatism distribution when the object-side surface and the eyeball-side surface are combined (this content will be adopted in the Examples section below). Then, after designing a new surface α' in the design process, the contribution of the surface α' to the power distribution and astigmatism distribution may be distributed between the object-side surface and the eyeball-side surface.

[0061] Hereinafter, an example will be given to demonstrate the further usefulness of one aspect of the present invention. It is preferable that the method for changing the progressive power mode of a progressive power lens according to one aspect of the present invention further comprises the following steps.

[0062] Whether or not the difference between the added power of the surface α' designed in the design process and the added power of the surface α before the smoothing process exceeds a threshold (Decision 1), and Whether or not the curvature of the distance portion of the surface α' designed in the design process differs from the curvature of the distance portion of the surface α before the smoothing process by exceeding a threshold value (Decision 2); A judgment step S5 for judging at least one of the above (preferably both judgments 1 and 2). If it is determined that the points are different in the determination step, the new z coordinate value z of each point is calculated using the following formula: p A z-coordinate value reacquisition step is performed to obtain (x, y), and each point is calculated based on the z-coordinate value z p A redesign process S6 for designing a surface α'' having the

number

[0063] The addition power of the surface α' designed in the design process often differs from the addition power of the surface α before the smoothing process. The same is true for the curvature of the distance portion. The determination process S5 determines whether the difference between the surfaces α and α' is large.

[0064] Whether or not this difference is large may be determined based on whether or not the difference exceeds a threshold value. This threshold value may be, for example, 0.25D (preferably, 0.12D, 0.10D, 0.08D, 0.05D, 0.03D, or 0.01D) for both determination 1 and determination 2.

[0065] If the difference between the surface α and the surface α' is large, it is preferable to reduce the difference. A specific method for doing this is defined in the redesign step S6.

[0066] In one aspect of the present invention, the difference in the addition power and / or the curvature of the distance portion between the surface α and the surface α' can be reduced to a threshold value or less (or eliminated in some cases) simply by carrying out the redesign process. p and z coordinate value z addp This is possible because the concept of "relationship between the x and y plane coordinates" is adopted, and the technical idea of ​​multiplying the weight by a weight map having continuity on the x and y plane coordinates by the approximate curvature map, also on the x and y plane coordinates, is adopted. This preferred example also greatly contributes to the effect of the present invention, which is that the shape of the addition profile can be easily changed without causing any design failure. Furthermore, the ease of change also greatly contributes to reducing the time required to change the progression mode.

[0067] According to one embodiment of the present invention, the shape of the subscription profile can be easily changed without causing any design problems.

[0068] <Modifications, etc.> Although one aspect of the present invention has been described above, the above disclosure shows one exemplary aspect of the present invention. In other words, the technical scope of the present invention is not limited to the above exemplary aspect, and various modifications are possible without departing from the spirit of the present invention. Furthermore, the above disclosure can be arbitrarily selected and combined with the following modifications.

[0069] The spectacle lens according to one aspect of the present invention has been described as having a distance portion for visually recognizing objects at a distance greater than a near distance. However, the distance portion may be a portion that is not intended to stably visually recognize objects at a distance greater than a near distance, but simply makes it possible to "visualize" objects at a distance greater than a near distance.

[0070] The distance portion of the eyeglass lens according to one embodiment of the present invention may be narrow. For example, it may be a progressive power lens in which the refractive power progresses not only downward but also upward from the starting point of the progressive power (in most cases, the refractive power decreases upward). In this case, the progressive power lens is provided with a distance portion measurement reference point, but this is merely a reference point for confirming whether the refractive power for a predetermined distance is secured, and a wide distance portion is not necessary. An example of such an eyeglass lens is the product name Lecture (registered trademark) TF.

[0071] The change in the progressive mode is not limited to an increase or decrease in the addition power. For example, the change in power may be gentler in the intermediate portion near the near portion, or conversely, the change in power may be greater in the intermediate portion near the near portion while the change in power may be gentler in the intermediate portion near the distance portion. In any case, in one embodiment of the present invention, the relationship between the approximate curvature and the z-coordinate value is utilized as a parameter when changing the progressive mode. In addition, a weight map is also used for the weight. Then, weights are assigned to the approximate curvature corresponding to the xy plane coordinates of the weight map. As long as the above technical concept is followed, any change in the progressive mode can be easily made without any design failure. In this respect, the technical significance of the present invention is extremely great.

[0072] The case where an approximate curvature is used has been exemplified as one aspect of the present invention. However, it is also possible to use the z coordinate itself instead of the approximate curvature. In other words, instead of the approximate curvature map, it is also possible to obtain a z coordinate value map on the xy plane and utilize this z coordinate value map. The configuration that reflects this technical idea is as follows. The following configuration is applicable not only to the method for changing the progressive mode, but also to the manufacturing methods, systems, and programs described below. "A method for changing the progressive power mode of a progressive power lens having an object-side surface and an eyeball-side surface, a near portion for visually recognizing objects at a near distance, a distance portion for visually recognizing objects at a distance greater than the near distance, and an intermediate portion for progressively increasing the refractive power between the near and distance portions, When wearing glasses, the axis passing through the lens center from the object side toward the eyeball side is the z-axis, the axis from bottom to top that is perpendicular to the z-axis is the y-axis, and the axis from left to right that is perpendicular to the z-axis is the x-axis. a weight map acquisition step of acquiring a weight map on an xy plane coordinate system for changing from progressive mode 1 to progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; a z-coordinate value map acquisition step of acquiring a distribution map of z-coordinate values ​​on an xy plane coordinate system for each point on a surface α that is a design surface; The weight w corresponding to each point on the weight map is assigned to the z coordinate value on the xy plane coordinate of the distribution map. p Multiply by z coordinate value z addp A z-coordinate value acquisition step for obtaining the z-coordinate value; The z-coordinate value z obtained in the z-coordinate value acquisition step addp a design process of designing a new surface α' based on the A method for changing the progressive mode of a progressive power lens, comprising:

[0073] The technical concept of the present invention is also reflected in a method for manufacturing eyeglass lenses, in which a lens substrate is processed to realize a surface designed by a method for changing the progressive power mode of a progressive power lens according to one aspect of the present invention.

[0074] FIG. 2 is a schematic block diagram of a system for changing the progressive power mode of a progressive power lens according to one embodiment of the present invention.

[0075] The technical concept of the present invention can also be applied to a system 10 for changing the progressive mode of a progressive power lens. An example of the configuration is as follows. "A system for changing the progressive power mode of a progressive power lens having an object-side surface and an eyeball-side surface, a near portion for visually recognizing objects at a near distance, a distance portion in which objects at a distance greater than the near distance can be visually recognized, and an intermediate portion for progressively increasing the refractive power between the near and distance portions, a weight map acquisition unit 1 for acquiring a weight map on an xy plane coordinate system for changing from progressive mode 1 to progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; Approximate curvature C for each point on the design surface α p an approximate curvature map acquisition unit 2 that acquires a distribution map on the xy plane coordinate system of Approximate curvature C at each point on the xy plane coordinates of the distribution map p , the weight w corresponding to each point on the weight map p and multiplying it by the z coordinate value z addp a z-coordinate value acquisition unit 3 for obtaining a z-coordinate value; The z coordinate value z obtained by the z coordinate acquisition unit addp a design unit 4 that designs a new surface α' based on the A system 10 for changing the progressive aspect of a progressive power lens, comprising:

[0076] The content performed by the weight map acquisition unit 1 is the same as the weight map acquisition process described above, so a description thereof will be omitted. The content performed by the approximate curvature map acquisition unit 2 is the same as the approximate curvature map acquisition process described above, so a description thereof will be omitted. The content performed by the z coordinate value acquisition unit 3 is the same as the z coordinate value acquisition process described above, so a description thereof will be omitted. The content performed by the design unit 4 is the same as the design process described above, so a description thereof will be omitted.

[0077] The weight map acquisition unit 1, approximate curvature map acquisition unit 2, z coordinate value acquisition unit 3, and design unit 4 (as well as the linear weight map creation unit 1a, planar weight map creation unit 1b, planar weight map adjustment unit 1c, judgment unit 5, and redesign unit 6 described below) may be performed by a calculation unit within a computer, or the control computer unit including the calculation unit may perform these roles.

[0078] The control computer unit functions as a computer device that performs information processing instructed by a specified program, and is specifically composed of a combination of a CPU (Central Processing Unit), HDD (Hard disk drive), ROM (Read Only Memory), RAM (Random Access Memory), external interface (I / F), etc.

[0079] The system 10 for changing the progressive aspect of a progressive power lens according to one aspect of the present invention preferably also includes the following configuration. "The weight map acquisition unit 1 a linear weight map creating unit 1a for obtaining a change rate of an addition curve of a progressive mode 2 relative to an addition curve of a progressive mode 1 from a progressive start point on an xy plane coordinate to a reference point for measuring near power according to a distance from the progressive start point on the xy plane coordinate to the reference point for measuring near power; a surface weight map creation unit 1b that develops the relationship between the distance and the change rate obtained by the linear weight map creation unit on an xy plane coordinate system with rotational symmetry about the progressive start point; and a surface weight map adjustment unit 1c that changes the change rate to 1 above the progressive start point in the surface weight map obtained by the surface weight map creation unit, while smoothing out discontinuities in the surface weight map that occur due to the change, thereby maintaining continuity.

[0080] The system 10 for changing the progressive aspect of a progressive power lens according to one aspect of the present invention preferably also includes the following configuration. The addition power and weight w of the surface α' designed by the design department p Whether the difference between the addition power at the surface α before multiplication exceeds a threshold value; and The curvature of the distance portion of the surface α′ designed by the design department and the weight w p whether the difference between the curvature of the distance portion on the surface α before multiplication and the curvature of the distance portion on the surface α before multiplication exceeds a threshold value; A determination unit 5 that determines at least one of the above If the determination unit determines that the threshold value is exceeded, the new z coordinate value z of each point is calculated using the above formula 2. p (x,y) and each point has the z coordinate value z p A redesign unit 6 that designs a surface α'

[0081] The technical concept of the present invention can also be applied to a program for the system 10 for changing the progressive mode of a progressive power lens. An example of the configuration is as follows. "A system for changing the progressive power mode of a progressive power lens having an object-side surface and an eyeball-side surface, a near portion for visually recognizing objects at a near distance, a distance portion in which objects at a distance greater than the near distance can be visually recognized, and an intermediate portion for progressively increasing the refractive power between the near and distance portions, a weight map acquisition unit 1 for acquiring a weight map on an xy plane coordinate system for changing from progressive mode 1 to progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; Approximate curvature C for each point on the design surface α p an approximate curvature map acquisition unit 2 for acquiring a distribution map on the xy plane coordinate system; Approximate curvature C at each point on the xy plane coordinates of the distribution map p , the weight w corresponding to each point on the weight map p and multiplying it by the z coordinate value z addp A z-coordinate value acquisition unit 3 for obtaining the z-coordinate value, and The z coordinate value z obtained by the z coordinate acquisition unit addp The program for the system for changing the progressive mode of a progressive power lens causes a computer to function as a design unit 4 that designs a new surface α' based on the above.

[0082] A program for a system 10 for changing the progressive mode of a progressive power lens according to one embodiment of the present invention preferably causes a computer to function as the linear weight map creation unit 1a, the planar weight map creation unit 1b, the planar weight map adjustment unit 1c, the judgment unit 5, and the redesign unit 6. [Example]

[0083] The present invention will be specifically explained below using examples, but the present invention is not limited to the following examples in any way.

[0084] <Reference Example 1> As a target for the smoothing process according to one embodiment of the present invention, a progressive refractive surface was prepared as a design surface, rather than a specific outer or inner surface. This progressive refractive surface corresponds to the original progressive refractive surface in WO97 / 019382. The specific method for incorporating this original progressive refractive surface into the surface of a lens may be the method described in the publication.

[0085] FIG. 3 shows the recruitment profiles of Reference Example 1 (solid line), Example 1 (10% reduction in ADD) (dashed line), and Example 2 (10% increase in ADD) (dotted line). FIG. 4A is a diagram showing the average power distribution of the progressive refractive surface in Reference Example 1. FIG. FIG. 4B is an astigmatism distribution diagram of the progressive refractive surface in Reference Example 1. The pitch of the average power distribution charts and astigmatism distribution charts described below is 0.25D.

[0086] In the progressive refractive surface according to Reference Example 1, the spherical power S was set to 0 D, the cylindrical power C was set to 0 D, and the addition power ADD was set to 2.00 D. An approximate curvature map of the progressive refractive surface was also obtained.

[0087] Example 1 Based on the method for changing the progressive mode of a progressive power lens described as one embodiment of the present invention, the progressive refractive surface of Reference Example 1 (progressive mode 1) was changed to a state in which the addition power ADD was reduced by 10% (progressive mode 2). The details of the weight map acquisition process are as follows.

[0088] 5 shows the linear weight maps of Example 1 (bottom) and Example 2 (top) together with the addition profile of Reference Example 1, with the left vertical axis representing the refractive power (D) of the addition profile, the right vertical axis representing the weight value, and the horizontal axis representing the distance (mm) from the progressive start point to the reference point for near power measurement on the xy plane coordinate system. The weight represents the rate of change of the addition curve of progressive mode 2 relative to the addition curve of progressive mode 1 from the progressive start point to the reference point for near power measurement on the xy plane coordinate system. The linear weight map creation step S1a is performed in this manner.

[0089] FIG. 6 is a planar weight map obtained by expanding the linear weight map in Example 1 onto an xy plane coordinate system with rotational symmetry about the progressive starting point. The horizontal axis (left-right direction on the paper) is the x-axis, the vertical axis (up-down direction on the paper) is the y-axis, and the three-dimensional direction is the t-axis (w p ) In this way, the planar weight map creation step S1b is carried out.

[0090] 7 is a diagram showing how the change rate is changed to 1 above (in the +y direction) a horizontal line (in the x-axis direction) passing through the progressive start point in the planar weight map in Example 1, while smoothing out discontinuities in the planar weight map that occur as a result of the change, thereby maintaining continuity. In this way, the planar weight map adjustment step S1c is performed.

[0091] Specifically, in the surface weight map adjustment step S1c, the xy plane coordinates in the surface weight map are converted into polar coordinates, and the term relating to the rate of change in the function constituting the surface weight map is multiplied by 0 when the polar coordinates are 0≦θ<π, and by sin 2 By multiplying by θ, discontinuities in the planar weight map are smoothed to maintain continuity.

[0092] Approximate curvature C at each point on the xy plane coordinates of the distribution map p , the weight w corresponding to each point on the weight map p and calculate the z coordinate value z using the following formula: addp a z-coordinate value acquisition step S3 for acquiring the z-coordinate value z obtained by the z-coordinate value acquisition step S3; addp A design step S4 was carried out to design a new surface α' based on the above.

[0093] FIG. 8A is a diagram showing the average power distribution of the progressive refractive surface in Example 1. FIG. 8B is an astigmatism distribution diagram of the progressive refractive surface in Example 1.

[0094] In this embodiment, the shape of the addition profile can be easily changed without causing any design failure. This is because the approximate curvature is used. In other words, this means that the parameter of the approximate curvature can be used to change the progressive mode of the progressive power lens without fearing any design failure that may occur due to the change in the progressive mode. This effect is also the same in the embodiments described below.

[0095] <Example 2> In this example, the progressive refractive surface (progressive mode 1) of Reference Example 1 was changed to a state in which the addition power ADD was increased by 10% (progressive mode 2').

[0096] As shown in FIG. 5, a linear weight map creation step S1a is performed.

[0097] FIG. 9 is a planar weight map obtained by expanding the linear weight map in Example 2 onto an xy plane coordinate system with the progressive starting point being rotationally symmetrical. The horizontal axis (left-right direction on the paper) is the x-axis, the vertical axis (up-down direction on the paper) is the y-axis, and the three-dimensional direction is the t-axis (w p ) In this way, the planar weight map creation step S1b is carried out.

[0098] 10 is a diagram showing how the change rate is changed to 1 above (in the +y direction) a horizontal line (in the x-axis direction) passing through the progressive start point in the planar weight map in Example 2, while smoothing out discontinuities in the planar weight map that occur as a result of the change, thereby maintaining continuity. In this way, the planar weight map adjustment step S1c is performed.

[0099] Specifically, in the surface weight map adjustment step S1c, the xy plane coordinates in the surface weight map are converted into polar coordinates, and the term relating to the rate of change in the function constituting the surface weight map is multiplied by 0 when the polar coordinates are 0≦θ<π, and by sin 2 By multiplying by θ, discontinuities in the planar weight map are smoothed to maintain continuity.

[0100] Approximate curvature C at each point on the xy plane coordinates of the distribution map p , the weight w corresponding to each point on the weight map p and calculate the z coordinate value z using the following formula: addp a z-coordinate value acquisition step S3 for acquiring the z-coordinate value z obtained by the z-coordinate value acquisition step S3; addp A design step S4 was carried out to design a new surface α' based on the above.

[0101] FIG. 11A is a diagram showing the average power distribution of the progressive refractive surface in Example 1. FIG. 11B is an astigmatism distribution diagram of the progressive refractive surface in Example 2.

[0102] In this embodiment, too, the shape of the addition profile can be easily changed without causing any design failure. Incidentally, in embodiment 1, a relatively wide clear vision area (area where astigmatism is 0.25D or less) is obtained in the area where the distance portion and the intermediate portion are connected, and in embodiment 2, a relatively wide clear vision area is obtained in the area where the near portion and the intermediate portion are connected. [Explanation of symbols]

[0103] 10...System for changing the progressive mode of a progressive power lens 1...Weight map acquisition section 1a...Linear weight map creation section 1b...area weight map creation section 1c...Area weight map adjustment section 2. Approximate curvature map acquisition unit 3...z coordinate value acquisition section 4...Design Department 5…Judgment section 6…Redesign Department

Claims

1. A method for changing the progressive power mode of a progressive power lens, the progressive power lens having an object-side surface and an eyeball-side surface, a near portion for visually recognizing objects at a near distance, a distance portion for visually recognizing objects at a distance farther than the near distance, and an intermediate portion for progressively increasing refractive power between the near and distance portions, the method changing the progressive power mode, which is the shape of an addition profile, which is the relationship between a distance on a main line of gaze and addition power, an astigmatism distribution, and a power distribution, from a progressive power mode 1 before the shape of the addition profile, the astigmatism distribution, and the power distribution are changed to a progressive power mode 2 after the shape of the addition profile, the astigmatism distribution, and the power distribution are changed, When wearing glasses, the axis passing through the lens center from the object side toward the eyeball side is the z-axis, the axis extending from bottom to top and perpendicular to the z-axis is the y-axis, and the axis extending from left to right and perpendicular to the z-axis is the x-axis. a weight map acquisition step of obtaining a weight map on an xy plane coordinate system for converting the addition profile, astigmatism distribution, and power distribution of the progressive mode 1 into the addition profile, astigmatism distribution, and power distribution of the progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; Approximate curvature C for each point on the surface α, which is the design surface ｐ an approximate curvature map acquisition step of acquiring a distribution map on the xy plane coordinate system of Approximate curvature C at each point on the xy plane coordinate of the distribution map ｐ The weight w corresponding to each point on the weight map ｐ The z-coordinate value z is calculated by the following formula: ａｄｄｐ a z-coordinate value acquisition step for obtaining a z-coordinate value; [Equation 1] The z-coordinate value z obtained in the z-coordinate value acquisition step ａｄｄｐ a design process of designing a new surface α' based on the and The weight map acquisition step includes: A linear weight map creation process for obtaining a change rate of an addition curve showing an addition profile of the progressive mode 2 relative to an addition curve showing an addition profile of the progressive mode 1 from a progressive start point on an xy plane coordinate to a reference point for measuring near power according to a distance from the progressive start point on an xy plane coordinate to the reference point for measuring near power; a planar weight map creation process in which the relationship between the distance and the rate of change obtained in the linear weight map creation process is expanded onto an xy plane coordinate system with rotational symmetry about the progressive start point; a surface weight map adjustment step of changing the change rate to 1 above the progressive start point in the surface weight map obtained in the surface weight map creation step, smoothing discontinuities in the surface weight map that occur due to the change, and maintaining continuity; A method for changing the progressive mode of a progressive power lens, comprising: Note that the approximate curvature C ｐ is defined as follows: Approximate curvature C of any point p(x, y, z) on the surface α ｐ In the xy plane perpendicular to the z axis, the inverse of the radius of the circle that passes through the three points p' (-x, -y, z) and (0, 0, 0) that are rotationally symmetric with respect to point p is used. However, when 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. In the surface weight map adjustment process, while converting the xy plane coordinates in the surface weight map into polar coordinates, the term relating to the rate of change in the function constituting the surface weight map is multiplied by 0 when the polar coordinates are 0≦θ<π, and by sin when the polar coordinates are π≦θ<2π. ２ 2. The method for changing the progressive mode of a progressive power lens according to claim 1, wherein the discontinuity of the surface weight map is smoothed by multiplying the surface weight map by θ, thereby maintaining continuity.

3. A method for changing the progressive mode of a progressive power lens as described in claim 1, wherein when changing from progressive mode 1 to progressive mode 2, the rate of change in add power after the change relative to the add power before the change is less than 0.

125.

4. The near portion is a region having a refractive power of (spherical power S+addition power ADD-0.12D) or more, 2. The method for changing the progressive mode of a progressive-power lens according to claim 1, wherein the distance portion is a portion for visually recognizing objects at a distance greater than a near distance and is a region having a refractive power within a range of (spherical power S±0.12D).

5. The addition power and weight w of the surface α′ designed by the design process ｐ Whether the difference between the addition power at the surface α before multiplication exceeds a threshold value; and The curvature of the distance portion of the surface α′ designed in the design process and the weight w ｐ whether the difference between the curvature of the distance portion on the surface α before multiplication and the curvature of the distance portion on the surface α before multiplication exceeds a threshold value; a determination step of determining at least one of the following: If it is determined in the determination step that the threshold value is exceeded, the new z coordinate value z of each point is calculated by the following formula: ｐ (x, y), and each point has the z coordinate value z ｐ 5. The method for changing the progressive mode of a progressive-power lens according to claim 4, further comprising a redesign step of designing a surface α'' comprising: [Equation 2] C ｆｂ Is the weight lol ｐ is the curvature of the distance portion before multiplication, and C ｎｂ Is the weight lol ｐ is the curvature of the near portion before multiplication, and C ｆａ Is the weight lol ｐ is the curvature of the distance portion after multiplication by C ｎａ Is the weight lol ｐ is the curvature of the near portion after multiplication by

6. A method for changing the progressive power mode of a progressive power lens, the progressive power lens having an object-side surface and an eyeball-side surface, a near portion for visualizing an object at a near distance, a distance portion for visualizing an object at a distance farther than the near distance, and an intermediate portion for progressively increasing refractive power between the near and distance portions, the method comprising changing the progressive power mode, which is the shape of an addition profile that is the relationship between a distance on a main line of gaze and addition power, an astigmatism distribution, and a power distribution, from progressive power mode 1 before changing the shape of the addition profile to progressive power mode 2 after changing the shape of the addition profile, When wearing glasses, the axis passing through the lens center from the object side toward the eyeball side is the z-axis, the axis extending from bottom to top and perpendicular to the z-axis is the y-axis, and the axis extending from left to right and perpendicular to the z-axis is the x-axis. a weight map acquisition step of acquiring a weight map on an xy plane coordinate system for converting the addition profile, astigmatism distribution, and power distribution of the progressive mode 1 into the addition profile, astigmatism distribution, and power distribution of the progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; a z-coordinate value map acquisition step of acquiring a distribution map of z-coordinate values ​​on an xy plane coordinate system for each point on a surface α that is a design surface; The z-coordinate value on the xy plane coordinate of the distribution map is assigned a weight w corresponding to each point on the weight map. ｐ Multiplying by z coordinate value z ａｄｄｐ a z-coordinate value acquisition step for obtaining a z-coordinate value; The z-coordinate value z obtained in the z-coordinate value acquisition step ａｄｄｐ a design process of designing a new surface α' based on the and The weight map acquisition step includes: A linear weight map creation process for obtaining a change rate of an addition curve showing an addition profile of the progressive mode 2 relative to an addition curve showing an addition profile of the progressive mode 1 from a progressive start point on an xy plane coordinate to a reference point for measuring near power according to a distance from the progressive start point on an xy plane coordinate to the reference point for measuring near power; a planar weight map creation process in which the relationship between the distance and the rate of change obtained in the linear weight map creation process is expanded onto an xy plane coordinate system with rotational symmetry about the progressive start point; a surface weight map adjustment step of changing the change rate to 1 above the progressive start point in the surface weight map obtained in the surface weight map creation step, smoothing discontinuities in the surface weight map that occur due to the change, and maintaining continuity; A method for changing the progressive mode of a progressive power lens, comprising:

7. A system for changing the progressive mode of a progressive power lens, the system comprising an object-side surface and an eyeball-side surface, a near portion for visualizing objects at a near distance, a distance portion for visualizing objects at a distance farther than the near distance, and an intermediate portion for progressively increasing refractive power between the near and distance portions, changes the progressive mode, which is the shape of an addition profile that is the relationship between a distance on a main line of gaze and addition power, astigmatism distribution, and power distribution, from progressive mode 1 before changing the shape of the addition profile to progressive mode 2 after changing the shape of the addition profile, When wearing glasses, the axis passing through the lens center from the object side toward the eyeball side is the z-axis, the axis extending from bottom to top and perpendicular to the z-axis is the y-axis, and the axis extending from left to right and perpendicular to the z-axis is the x-axis. a weight map acquisition unit for acquiring a weight map on an xy plane coordinate system for converting the addition profile, astigmatism distribution, and power distribution of the progressive mode 1 into the addition profile, astigmatism distribution, and power distribution of the progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; Approximate curvature C for each point on the surface α, which is the design surface ｐ an approximate curvature map acquisition unit that acquires a distribution map on the xy plane coordinate system of Approximate curvature C at each point on the xy plane coordinate of the distribution map ｐ The weight w corresponding to each point on the weight map ｐ The z-coordinate value z is calculated by the following formula: ａｄｄｐ a z-coordinate value acquisition unit for obtaining a z-coordinate value; [Equation 3] The z-coordinate value z obtained by the z-coordinate value acquisition unit ａｄｄｐ Design a new surface α' based on The design department and and The weight map acquisition unit A linear weight map creating unit that obtains a change rate of an addition curve showing an addition profile of the progressive mode 2 relative to an addition curve showing an addition profile of the progressive mode 1 from a progressive start point on an xy plane coordinate to a reference point for measuring near power according to a distance from the progressive start point on an xy plane coordinate to the reference point for measuring near power; a surface weight map creation unit that develops the relationship between the distance and the change rate obtained by the linear weight map creation unit on an xy plane coordinate system with rotational symmetry about the progressive start point; a surface weight map adjustment unit that changes the change rate to 1 above the progressive start point in the surface weight map obtained by the surface weight map creation unit, and smooths discontinuities in the surface weight map that occur due to the change to maintain continuity; A system for changing the progressive aspect of a progressive power lens, comprising: Note that the approximate curvature C ｐ is defined as follows: Approximate curvature C of any point p(x, y, z) on the surface α ｐ In the xy plane perpendicular to the z axis, the inverse of the radius of the circle that passes through the three points p' (-x, -y, z) and (0, 0, 0) that are rotationally symmetric with respect to point p is used. However, when 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.

8. The addition power and weight w of the surface α′ designed by the design department ｐ Whether the difference between the addition power at the surface α before multiplication exceeds a threshold value; and The curvature of the distance portion of the surface α′ designed by the design unit and the weight w ｐ whether the difference between the curvature of the distance portion on the surface α before multiplication and the curvature of the distance portion on the surface α before multiplication exceeds a threshold value; a determination unit that determines at least one of the above; If the determination unit determines that the threshold value is exceeded, new z coordinate values ​​z of the points are calculated by the formula. ｐ (x, y), and each point has the z coordinate value z ｐ a redesign unit that designs a surface α′ having the surface α′; 8. The system for changing the progressive aspect of a progressive power lens according to claim 7, comprising:

9. A progressive power lens has an object-side surface and an eyeball-side surface, and is provided with a near portion for visualizing objects at a near distance, a distance portion for visualizing objects at a distance farther than the near distance, and an intermediate portion for progressively increasing refractive power between the near and distance portions, and the progressive power is changed from a progressive power change 1 before the shape of the addition profile, the astigmatism distribution, and the power distribution are changed to a progressive power change 2 after the shape of the addition profile, the astigmatism distribution, and the power distribution are changed, When wearing glasses, the axis passing through the lens center from the object side toward the eyeball side is the z-axis, the axis extending from bottom to top and perpendicular to the z-axis is the y-axis, and the axis extending from left to right and perpendicular to the z-axis is the x-axis. a weight map acquisition unit for acquiring a weight map on an xy plane coordinate system for converting the addition profile, astigmatism distribution, and power distribution of the progressive mode 1 into the addition profile, astigmatism distribution, and power distribution of the progressive mode 2, the weight map having continuity in all directions on the xy plane coordinate system; Approximate curvature C for each point on the surface α, which is the design surface ｐ an approximate curvature map acquisition unit that acquires a distribution map on the xy plane coordinate system; Approximate curvature C at each point on the xy plane coordinate of the distribution map ｐ The weight w corresponding to each point on the weight map ｐ The z-coordinate value z is calculated by the following formula: ａｄｄｐ A z-coordinate value acquisition unit that obtains [Equation 4] The z-coordinate value z obtained by the z-coordinate value acquisition unit ａｄｄｐ a design unit that designs a new surface α' based on In the weight map acquisition unit, a linear weight map creating unit for obtaining a change rate of an addition curve showing an addition profile of the progressive mode 2 relative to an addition curve showing an addition profile of the progressive mode 1 from a progressive start point on an xy plane coordinate to a reference point for measuring near power, in accordance with a distance from the progressive start point on the xy plane coordinate to the reference point for measuring near power; a surface weight map creation unit that develops the relationship between the distance and the rate of change obtained by the linear weight map creation unit on an xy plane coordinate system with rotational symmetry about the progressive start point; a surface weight map adjustment unit that changes the change rate to 1 above the progressive start point in the surface weight map obtained by the surface weight map creation unit, while smoothing discontinuities in the surface weight map that occur due to the change, thereby maintaining continuity; A program for a system for changing the progressive aspect of a progressive power lens, which causes a computer to function as Note that the approximate curvature C ｐ is defined as follows: Approximate curvature C of any point p(x, y, z) on the surface α ｐ In the xy plane perpendicular to the z axis, the inverse of the radius of the circle that passes through the three points p' (-x, -y, z) and (0, 0, 0) that are rotationally symmetric with respect to point p is used. However, when 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.

10. The addition power and weight w of the surface α′ designed by the design department ｐ Whether the difference between the addition power at the surface α before multiplication exceeds a threshold value; and The curvature of the distance portion of the surface α′ designed by the design unit and the weight w ｐ whether the difference between the curvature of the distance portion on the surface α before multiplication and the curvature of the distance portion on the surface α before multiplication exceeds a threshold value; a determination unit that determines at least one of the above; and If the determination unit determines that the threshold value is exceeded, new z coordinate values ​​z of the points are calculated by the formula. ｐ (x, y), and each point has the z coordinate value z ｐ 10. A program for a system for changing the progressive mode of a progressive power lens according to claim 9, which causes a computer to function as a redesign unit that designs a surface α'' comprising:

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