Progressive power lenses and methods of designing progressive power lenses

Abstract

A progressive power lens comprises: a distance portion suitable for hyperopia; a near portion disposed at a different position from the distance portion and having refractive power suitable for myopia; and a progressive portion in which the refractive power continuously varies between the distance portion and the near portion, wherein a virtual distance position is set in a range that is higher than the eyepoint and lower than the distance portion, and the addition at the virtual distance position is corrected based on the addition ratio of the eyepoint position.

Description

Technical Field

[0001] This invention relates to progressive power lenses and a method for designing progressive power lenses.

[0002] This application claims priority based on Japanese Patent Application No. 2023-214802, filed in Japan on December 20, 2023, the contents of which are incorporated herein by reference. Background Technology

[0003] Intermediate near lenses are lenses that increase the periphery of the eyepoint, thus expanding the range of distances visible from intermediate to near compared to progressive lenses. In intermediate near lenses, the periphery of the eyepoint has high affinity, thus smoothing the change in affinity by placing the distant prescription at a higher, more distant position.

[0004] A lens prescription includes a distance prescription and an addition power based on that distance prescription. Therefore, the distance prescription occurs at locations far from the center and eyepoint of the lens. As a result, in lens optimization, performance near the center, where usage is most frequent, can sometimes deteriorate.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2015-87439 Summary of the Invention

[0008] One aspect of the present invention is a progressive refractive power lens comprising: a distance portion suitable for hyperopia; a near portion disposed at a different position from the distance portion and having refractive power suitable for myopia; and a progressive portion wherein the refractive power continuously varies between the distance portion and the near portion, wherein a virtual distance position is set in a range that is higher than the eyepoint and lower than the distance portion, and the addition degree at the virtual distance position is corrected based on the addition degree ratio of the position of the eyepoint.

[0009] One aspect of the present invention is a method for designing a progressive power lens, the progressive power lens comprising: a distance portion suitable for hyperopia; a near portion disposed at a different position from the distance portion and having refractive power suitable for myopia; and a progressive portion, wherein the refractive power continuously varies between the distance portion and the near portion, the method for designing the progressive power lens comprising: obtaining the addition power of a wearer's distance prescription; obtaining the addition power ratio of an eyepoint position; and correcting the addition power at a virtual distance position based on the addition power ratio of the eyepoint position, the virtual distance position being set in a range that is higher than the eyepoint and lower than the distance portion. Attached Figure Description

[0010] Figure 1 This is a diagram illustrating an example of a progressive refractive power lens implemented in this way.

[0011] Figure 2 This is a diagram illustrating an example of the addition curve of a progressive refractive power lens in an embodiment.

[0012] Figure 3 This is a diagram illustrating an example of the degree of participation at a virtual remote location in an implementation method.

[0013] Figure 4 This is an example of a contour plot showing the residual aberrations of an implementation method.

[0014] Figure 5 This is a graph showing an example of the inclusion curve when the customized eyepoint inclusion ratio of the implementation method is 15%.

[0015] Figure 6 This is a graph showing an example of the inclusion curve when the customized eyepoint inclusion ratio of the implementation method is 25%.

[0016] Figure 7 This is a graph showing an example of the inclusion curve when the customized eyepoint inclusion ratio of the implementation method is 40%.

[0017] Figure 8 This is a flowchart illustrating an example of a design and manufacturing method for a progressive refractive power lens.

[0018] Figure 9 This diagram illustrates an example of a progressive refractive power lens in the prior art.

[0019] Figure 10 This is a diagram illustrating an example of the addition curve of a prior art progressive refractive power lens.

[0020] Figure 11 This diagram illustrates an example of a prior art intermediate-near progressive refractive power lens.

[0021] Figure 12 This is a diagram illustrating an example of the addition curve of a prior art intermediate-near progressive refractive power lens.

[0022] Figure 13 This is an example of a contour plot showing the residual aberrations of a prior art intermediate-near progressive refractive power lens. Detailed Implementation

[0023] (Implementation Method)

[0024] Hereinafter, the first embodiment will be described in detail with reference to the accompanying drawings. Figure 1 This diagram illustrates an example of the progressive refractive power lens 1 according to this embodiment. Figure 1 In this context, the progressive lens 1 is the lens in its state before processing according to the shape of the eyeglass frame (the state before edging). The progressive lens 1 forms a circle or ellipse when viewed from above, and may be spherical depending on the situation. Figure 1 In the case of the progressive refractive power lens 1, the upper side is positioned at the top when worn, and the lower side is positioned at the bottom when worn.

[0025] The progressive refractive power lens 1 includes a distance vision section FR1, a near vision section NR1, and a progressive section MR1.

[0026] The distance-use section FR1 is located on the upper part of the progressive lens 1. The distance-use section FR1 serves as the area suitable for farsightedness after the progressive lens 1 is manufactured into eyeglasses.

[0027] The near vision portion NR1 is located at the lower part of the progressive lens 1. The near vision portion NR1 is the part that has refractive power corresponding to near vision after the progressive lens 1 is processed into eyeglasses. That is, the near vision portion NR1 is a region located in a different position than the distance vision portion FR1 and has refractive power suitable for myopia.

[0028] The progressive section MR1 is located between the distance section FR1 and the near section NR1. The progressive section MR1 is the region where the refractive power continuously changes between the distance section FR1 and the near section NR1.

[0029] The distance-use section FR1 is located on the upper part of the progressive lens 1, and becomes the part that provides refractive power corresponding to distance vision after the progressive lens 1 is processed into eyeglasses. The near-use section NR1 is located on the lower part of the progressive lens 1, and becomes the part that provides refractive power corresponding to near vision after the progressive lens 1 is processed into eyeglasses. The progressive section MR1 is the part that connects the distance-use section FR1 and the near-use section NR1 to ensure a continuous and smooth change in refractive power.

[0030] A primary gazing line M1 is set approximately in the center of the progressive lens 1. The primary gazing line M1 is a virtual line on the lens through which the wearer's line of sight passes when viewing an object located below them from above. Due to the convergence of near vision response, it deviates further inward as the object approaches its nearest point.

[0031] The progressive power lens 1 has multiple reference points on the main gaze line M1. Among the reference points of the progressive power lens 1 are, for example, the virtual distance position FF1, the eye point IP1, and the near measurement position NF1. The virtual distance position FF1, the eye point IP1, and the near measurement position NF1 are arranged sequentially from top to bottom on the main gaze line M1.

[0032] The eye point IP1 serves as the reference point for the wearer when wearing progressive refractive power lenses 1.

[0033] The virtual distance position FF1 is the same as the distance measurement position for progressive refractive power lenses. Here, refer to... Figure 9 This paper explains the distance measurement position for existing progressive refractive power lenses.

[0034] Figure 9 This figure illustrates an example of a prior art progressive refractive power lens 10. The progressive refractive power lens 10 includes a distance viewing section FR 10, a near viewing section NR 10, and a progressive section MR 10. A primary fixation line M10 is provided approximately at the center of the progressive refractive power lens 10. The progressive refractive power lens 10 has multiple reference points on the primary fixation line M10. Among the reference points of the progressive refractive power lens 10 are a distance measurement position FF 10, an eye point IP 10, and a near measurement position NF 10. The distance measurement position FF 10, the eye point IP 10, and the near measurement position NF 10 are sequentially arranged from top to bottom on the primary fixation line M10.

[0035] The progressive refractive power lens 10 is a lens for focusing from infinity to near distance. In the progressive refractive power lens 10, the prescription position for focusing to infinity is not the eye point IP10, but rather a distance measurement position FF10 located higher than the eye point IP10. As an example, in the progressive refractive power lens 10, the distance measurement position FF10 is set within a range of 4mm to 8mm above the eye point IP10.

[0036] As an example, the progressive refractive power lens 10 has an addition power of 2.00 diopters. Figure 10 The image shows the addition curve of the progressive refractive power lens 10 for near and far vision. (Example) Figure 10 As shown, in the progressive refractive power lens 10, the addition power of the distance-use portion FR10 is zero.

[0037] return Figure 1 Continuing with the explanation of progressive refractive power lenses 1.

[0038] The virtual distance position FF1 is, for example, the same position as the distance measurement position FF10 of the prior art progressive refractive power lens 10 as described above.

[0039] Furthermore, as an example, the virtual distance position FF1 is set within a range of 4mm to 8mm upward from the eye point IP1. Here, the distance measurement position of the progressive refractive power lens is included in a range that is higher than the eye point IP1 and lower than the distance portion FR1. Additionally, the range of 4mm to 8mm upward from the eye point IP1 is included in a range that is higher than the eye point IP1 and lower than the distance portion FR1. Therefore, in the progressive refractive power lens 1, the virtual distance position FF1 is set within a range that is higher than the eye point IP1 and lower than the distance portion FR1.

[0040] Next, refer to Figure 2 The addition curve of progressive refractive power lens 1 is explained. Figure 2 This is a diagram showing an example of the addition power curve of the progressive refractive power lens 1 in this embodiment. Figure 2 In this context, "height" refers to the vertical height of the progressive lens 1 relative to the eye point IP1. Here, the height corresponding to eye point IP1 is 0 mm. Below, the vertical height of the progressive lens 1 may be simply referred to as the height of the progressive lens 1.

[0041] Here, when the wearer's distance prescription is spherical prescription power Sph0, astigmatic prescription power Cyl0, astigmatic axis Ax0, and prescription addition power Add0, the eye point addition power ratio (also referred to as the customized eye point addition power ratio) of the progressive refractive power lens 1 ordered as the product is set to Xep (%). The eye point addition power ratio Xep has a value from 0% to 50%. For example, when Xep=25%, if the prescription addition power Add0=2.50D, then the addition power at eye point IP1 is 2.50×0.25=0.625D.

[0042] The Xep ratio can be determined based on the product, or it can be directly entered when ordering eyeglass lenses based on the value calculated according to the wearer's desired viewing distance or lifestyle.

[0043] For prescriptions that accept custom-made lenses, the power of the progressive refractive lens 1 at the virtual distance position FF1 is set as the virtual distance spherical power Sph1, the virtual distance astigmatism power Cyl1, and the virtual distance astigmatic axis Ax1. The relationships between these virtual distance spherical power Sph1, virtual distance astigmatism power Cyl1, and virtual distance astigmatic axis Ax1 and the wearer's distance prescription spherical prescription power Sph0, astigmatism prescription power Cyl0, and astigmatic axis Ax0 are expressed as Equations (1), (2), and (3), respectively.

[0044] [Formula 1] …(1) [Formula 2] …(2) [Formula 3] …(3) As shown in equations (2) and (3), the virtual distance astigmatism power Cyl1 and the virtual distance astigmatism axis Ax1 are kept to the same value as the prescription power. At the same time, as shown in equation (1), the positive power Add1 is added to the virtual distance spherical power Sph1. The positive power Add1 is represented by equation (4).

[0045] [Formula 4] …(4) The addition ratio X0 ranges from 10% to 20%. The addition ratio X0 is determined based on the design boundaries of the near and far progressive lenses and the intermediate near progressive lenses. The addition ratio X0 refers to the maximum addition ratio at which the power can be seen at infinity in the distance position. That is, the addition ratio X0 refers to the maximum addition ratio of the near and far progressive lenses. In addition, if the value of the point addition ratio Xep is less than the value of the addition ratio X0, the value of the positive power Add1 is set to 0 in equation (4).

[0046] The value of parameter α ranges from 0.15 to 0.25. Parameter α is used to determine the ratio of the addition power at the virtual distance position FF1. Parameter α is set so that the addition power at the virtual distance position FF1 is the same as that of the intermediate-near progressive refractive power lens, so that there is no discomfort when replacing with the existing intermediate-near progressive refractive power lens.

[0047] According to equation (1), in the progressive power lens 1, the adsorption at the virtual distance position FF1 is corrected based on the adsorption ratio Xep of the eyepoint at the position of eyepoint IP1. Figure 3 The figure shows the joining degree at the virtual remote location FF1. Figure 3 The image shows the eye-point engagement ratio Xep relative to the position of eye-point IP1 at the virtual far-field position FF1.

[0048] As described above, in the progressive power lens 1, the virtual distance position FF1 is set in a range that is higher than the eyepoint IP1 and lower than the distance portion FR1. In the progressive power lens 1, within this range where the virtual distance position FF1 is set, the change in power is less than or equal to a predetermined value. This predetermined value can be, for example, + / - 0.12D (diopter) or less.

[0049] In progressive power lenses 1, such as Figure 2As shown in the graph of the inclination curve, the change in power of the progressive refractive power lens 1 relative to height is kept as constant as possible at the virtual distance viewing position FF1. In other words, keeping the change in power relative to height as constant as possible means making the graph of the inclination curve with inclination on the horizontal axis and height on the vertical axis as perpendicular to the horizontal axis as much as possible at the virtual distance viewing position FF1. By stabilizing the change in inclination relative to height at the virtual distance viewing position FF1, the area of ​​stable observation at the imagined distance under that inclination is widened, and the wearing comfort is improved.

[0050] In order to compare with the progressive refractive power lens 1 of this embodiment, the prior art intermediate progressive refractive power lens 20 will be described. Figure 11 This figure shows an example of a prior art intermediate-near progressive refractive power lens 20.

[0051] The intermediate-near progressive refractive power lens 20 includes a distance vision section (FR20), a near vision section (NR20), and a progressive vision section (MR20). A primary fixation line (M20) is positioned approximately at the center of the intermediate-near progressive refractive power lens 20. The intermediate-near progressive refractive power lens 20 has multiple reference points on the primary fixation line M20. These reference points include a distance measurement position (FF20), an eye point (IP20), and a near measurement position (NF20). The distance measurement position (FF20), eye point (IP20), and near measurement position (NF20) are sequentially arranged from top to bottom on the primary fixation line M20.

[0052] In the existing intermediate-near progressive refractive power lens 20, the distance measurement position FF20 is located at a position relative to the distance-near progressive refractive power lens 10 (reference). Figure 9 The position is higher, determined by the degree of inclusion at the eye point IP20. Therefore, in the intermediate-near progressive power lens 20, the visible range for distance use is difficult to directly compare with that of a distance progressive lens (e.g., distance progressive power lens 10).

[0053] The progressive refractive power lens 20 has an addition power of 2.00 diopters, and the addition power ratio of the eye point IP20 is 25%. Figure 12 The image shows the addition curve of the intermediate near progressive refractive power lens 20. (Example) Figure 12 As shown, in the intermediate near progressive refractive power lens 20, within a range of 4mm to 8mm upward from the eyepoint IP20, the change in the degree of addition is different from the change in the degree of addition of the progressive refractive power lens 1 of this embodiment ( Figure 2 )big.

[0054] Furthermore, in the progressive power lens 1, a position with the same distance prescription and equivalent spherical power is set above the virtual distance position FF1. Therefore, the wearer of the progressive power lens 1 can see a greater distance than that set at the virtual distance position FF1.

[0055] Next, the residual aberrations of the progressive power lens 1 will be explained.

[0056] Before explaining the residual aberrations of the progressive power lens 1, for comparison, the residual aberrations of the prior art intermediate near progressive power lens 20 will be explained. Figure 13 This is a contour plot P10 showing an example of the residual aberration of a prior art intermediate-near progressive refractive power lens 20. Figure 13 The top and bottom directions of the contour map P10 are... Figure 11 The vertical direction is consistent. In the contour map P10, the optimal reference position FP10 corresponds to... Figure 11 The remote measurement location is shown as FF20.

[0057] In existing intermediate-to-near progressive refractive power lenses 20, optimization is performed based on the distance measurement position FF20 as a reference, according to the distance power. Even with optimization, residual aberrations remain in intermediate-to-near progressive refractive power lenses 20, especially in prescriptions for high myopia or high hyperopia. Residual aberrations tend to increase as they move away from the optimized reference position. Therefore, if optimization is performed at the distance measurement position FF20 of existing intermediate-to-near progressive refractive power lenses 20, residual aberrations near the center of the lens, which is used most frequently, may sometimes increase.

[0058] Figure 4 This is a diagram showing an example of a contour plot P1 representing the residual aberrations of this embodiment. Figure 4 The top and bottom directions of contour map P1 are... Figure 1 The vertical direction is consistent. In the contour map P1, the optimal reference position FP1 corresponds to... Figure 1 The virtual remote location FF1 is shown.

[0059] As described above, in the progressive power lens 1 of this embodiment, the optimized reference position is the virtual distance position FF1. The virtual distance position FF1 is closer to the eye point IP1 than the existing distance measurement position. Therefore, in the progressive power lens 1, residual aberrations can be suppressed in areas with high usage frequency.

[0060] Reference Figures 5 to 7 , representing an example of the incorporation curve for each customized eyepoint incorporation ratio. Figure 5 , Figure 6 and Figure 7 These are examples of inclusion curves showing the inclusion ratios of 15%, 25%, and 40% for customized eyepoint inclusion. Figure 5 , Figure 6 and Figure 7In this diagram, the addition power curves of a prior art intermediate near progressive refractive power lens 20 are shown superimposed for comparison with the progressive refractive power lens 1 of this embodiment. Within a height range of approximately 0 mm to 6 mm, the addition power curve of the progressive refractive power lens 1 is a downward convex curve, located below the addition power curve of the intermediate near progressive refractive power lens 20. Therefore, within the range where the virtual distance position FF1 is provided, the change in addition power is set to a predetermined size or less.

[0061] Next, refer to Figure 8 The design and manufacturing methods of the progressive power lens 1 are explained. Figure 8 This is a flowchart illustrating an example of the design and manufacturing method of the progressive refractive power lens 1 according to this embodiment. Figure 8 The design method shown is executed by computing device 2 (not shown). Figure 8 The manufacturing method shown is performed by the design device 3 (not shown). The computing device 2 is a computing device that calculates values ​​related to the optical characteristics of the progressive power lens 1 based on information obtained through input or communication from the user of the computing device 2. Here, the user of the computing device 2 (hereinafter simply referred to as the user) refers to a human who operates the computing device 2, such as eyeglass wearers including customers who come to an eyeglasses store and employees of the eyeglasses store.

[0062] Step S10: The computing device 2 acquires the wearer's prescription data. The prescription data includes the spherical prescription power Sph0, the astigmatic prescription power Cyl0, the astigmatic axis Ax0, and the prescription addition degree Add0 as the wearer's distance prescription. Therefore, the computing device 2 acquires the addition degree of the wearer's distance prescription.

[0063] Step S20: The computing device 2 obtains the eye-point engagement ratio Xep at eye-point IP1. Here, the computing device 2 calculates the eye-point engagement ratio Xep, for example, based on a value calculated according to the distance the wearer wishes to see when looking straight ahead or their lifestyle habits. Alternatively, the computing device 2 may obtain the eye-point engagement ratio Xep input by the user from an input device.

[0064] Step S30: The computing device 2 calculates the degree of addition at eye point IP1. The computing device 2 calculates the degree of addition at eye point IP1 by multiplying the degree of addition contained in the prescription data by the eye point addition ratio Xep.

[0065] Step S40: The computing device 2 calculates the inclination at the virtual telescopic position FF1. Here, the computing device 2 corrects and calculates the virtual telescopic spherical power Sph1 at the virtual telescopic position FF1 based on the eyepoint inclination ratio Xep according to the prescription power. The computing device 2 corrects the virtual telescopic spherical power Sph1, for example, based on the above formula (1). Therefore, the computing device 2 corrects the inclination at the virtual telescopic position FF1 based on the inclination ratio (eyepoint inclination ratio Xep) of the position of the eyepoint IP1, which is located in a range that is higher than the eyepoint IP1 and lower than the telescopic part FR1.

[0066] The computing device 2 calculates the virtual distance astigmatism power Cyl1 and the virtual distance astigmatism axis Ax1, which are the same as the prescription power.

[0067] Step S50: Design device 3 acquires spectacle lens design information. Here, the spectacle lens design information includes information about the calculated virtual distance spherical power Sph1 at the virtual distance position FF1, the virtual distance astigmatism power Cyl1 and the virtual distance astigmatic axis Ax1, the joining power at the near measurement position NF1, the joining power at the eye point IP1, and the frame, etc. The spectacle lens design information is sent to design device 3, for example, from an optical shop via a spectacle lens ordering device and a spectacle lens customization device (not shown).

[0068] Step S60: The design device 3 is designed based on the obtained spectacle lens design information to continuously connect the various parts of the progressive refractive power lens 1.

[0069] Step S70: The spectacle lens processing apparatus (not shown) manufactures the designed progressive refractive power lens 1.

[0070] This concludes the design and manufacturing methods for the progressive refractive power lens 1.

[0071] As explained above, the progressive power lens 1 of this embodiment includes: a distance viewing portion FR1, suitable for hyperopia; a near viewing portion NR1, disposed at a different position from the distance viewing portion FR1 and having refractive power suitable for myopia; and a progressive portion MR1, the refractive power of which continuously varies between the distance viewing portion FR1 and the near viewing portion NR1. In the progressive power lens 1 of this embodiment, the virtual distance viewing position FF1 is set in a range that is higher than the eye point IP1 and lower than the distance viewing portion FR1, and the addition power at the virtual distance viewing position FF1 is corrected based on the addition power ratio of the position of the eye point IP1 (in this embodiment, the eye point addition power ratio Xep).

[0072] With this structure, in the progressive refractive power lens 1 of this embodiment, the distance observable at the distance viewing position FR1 can be directly compared based on the addition power at the virtual distance viewing position FF1, thus making it easier for the wearer to understand when deciding on the design type of the eyeglass lens. The design type refers to the addition power ratio at the eye point.

[0073] Furthermore, a program for implementing the function of any structural part in any of the devices described above can be recorded on a computer-readable recording medium, allowing the computer system to read and execute the program. Additionally, the term "computer system" as used herein includes hardware such as an operating system or interface devices. Furthermore, "computer-readable recording medium" refers to removable media such as flexible disks, magneto-optical disks, ROM (read-only memory), and CD-ROMs, as well as storage devices such as hard disks built into a computer system. Moreover, "computer-readable recording medium" also includes media that retain programs for a certain period of time, such as volatile memory within a computer system acting as a server or client when transmitting programs via networks such as the Internet or communication lines such as telephone lines. This volatile memory can be, for example, RAM (Random Access Memory). The recording medium can be, for example, a non-transitory recording medium.

[0074] Furthermore, the program can also be transmitted from a computer system stored in a storage device or the like to another computer system via a transmission medium or by using transmission waves in the transmission medium. Here, the "transmission medium" for transmitting the program refers to a medium with the function of transmitting information, such as a network like the Internet or a communication line like a telephone line.

[0075] Alternatively, the program may be a part of a program used to implement the function. Furthermore, the program may be a so-called differential file, which can implement the function through combination with a program already recorded in the computer system. A differential file may also be called a differential program.

[0076] Furthermore, the functions of any structural component in any of the devices described above can also be implemented by a processor. For example, the various processes in the embodiments can also be implemented by a processor that operates based on information such as programs and a computer-readable recording medium that stores such information. Here, the processor can implement the functions of each component, for example, by separate hardware or by integrated hardware. For example, the processor includes hardware that may include at least one of circuitry for processing digital signals and circuitry for processing analog signals. For example, the processor can be constructed using one or more circuit devices or one or more circuit components mounted on a circuit board, or both. As a circuit device, an IC (Integrated Circuit) can be used, and as a circuit component, a resistor or capacitor can be used.

[0077] Here, the processor may be, for example, a CPU (Central Processing Unit). However, the processor is not limited to a CPU; various processors such as a GPU (Graphics Processing Unit) or a DSP (Digital Signal Processor) may also be used. Furthermore, the processor may be, for example, an ASIC (Application Specific Integrated Circuit) based hardware circuit. Additionally, the processor may include multiple CPUs, or multiple ASIC-based hardware circuits. Furthermore, the processor may include, for example, a combination of multiple CPUs and multiple ASIC-based hardware circuits. Additionally, the processor may include, for example, one or more amplifier circuits or filter circuits for processing analog signals.

[0078] The above description, with reference to the accompanying drawings, details one embodiment of the present invention. The specific structure is not limited to the described embodiment, and various design changes can be made without departing from the spirit of the present invention.

[0079] Label Explanation

[0080] 1…Progressive power lens, FR1…Distance lens, NR1…Near lens, MR1…Progressive lens, FF1…Virtual distance position, IP1…Eye point, NF1…Near measurement position

Claims

1. A progressive lens comprising: a distance portion suitable for hyperopia; a near portion disposed at a different position from the distance portion and having a refractive power suitable for myopia; and a progressive portion wherein the refractive power continuously varies between the distance portion and the near portion. The virtual telephoto position is set within a range that is higher than the eyepoint and lower than the telephoto unit. The inclination at the virtual remote location is corrected based on the inclination ratio of the eye point's location.

2. The progressive refractive power lens according to claim 1, wherein, Within the specified range, the variation in the degree of addition is below a predetermined value.

3. The progressive refractive power lens according to claim 1, wherein, The virtual remote position is set within a range of 4mm to 8mm above the eye point.

4. The progressive refractive power lens according to claim 1, wherein, The virtual distance position is the same as the distance measurement position of the progressive refractive power lens.

5. The progressive refractive power lens according to claim 1, wherein, A position with the same remote prescription and equivalent spherical degree is provided above the virtual remote position.

6. A method of designing a progressive power lens having a distance vision portion adapted for distance vision and a near vision portion disposed at a different location from the distance vision portion and having a power adapted for near vision. The progressive power lens, wherein the refractive power changes continuously between the distance and near ranges, is designed using a method comprising: Obtain the wearer's prescription for remote use and its degree of inclusion; The ratio of the degree of addition to the position of the eye point; and The inclination at the virtual telephoto location is corrected based on the inclination ratio of the eye point's position, and the virtual telephoto location is set within a range that is higher than the eye point and lower than the telephoto portion.

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