WO2010044266A1

WO2010044266A1 - Progressive power lens and progressive power lens series

Info

Publication number: WO2010044266A1
Application number: PCT/JP2009/005371
Authority: WO
Inventors: 矢成光弘; 水野正朝; 内山幸昌
Original assignee: 株式会社ニコン・エシロール
Priority date: 2008-10-14
Filing date: 2009-10-14
Publication date: 2010-04-22

Abstract

Optimization of the optical properties of transmission light rays is performed in consideration of the prescription for a wearer, the use condition, and the like so that the sum of the surface addition power (ADDb) (S, C, add) at a reference surface and the surface addition power (ADDc) (S, C, add) at a correction surface may be smaller than the addition power (add) specified by the prescription. It is thereby possible to make the distance power and the addition power, which are important specifications for a progressive power lens, equal to the value specified by the prescription value and improve the optical properties of the transmission light rays to be closer to the target optical properties of the progressive power lens.

Description

Progressive power lens and progressive power lens series

The present invention relates to a progressive-power lens used as an aid to eye accommodation, and more particularly to a progressive-power lens and a progressive-power lens series in which both the outer surface and the inner surface of the lens are aspherical.
This application claims priority based on Japanese Patent Application No. 2008-265630 and Japanese Patent Application No. 2008-265631 filed on Oct. 14, 2008, the contents of which are incorporated herein by reference.

As a corrective spectacle lens to compensate for the decline in the adjustment power due to presbyopia, in the wearing state, a distance portion that is a relatively suitable region for far vision located above the lens, and a distance-use portion located below the lens It is located in the middle of the near part and the near part, which is a relatively suitable area for near vision than the part, and the surface refractive power of the far part and the near part is continuously changed. There is known a progressive power lens having a progressive portion which is a connected area.

Progressive-power lenses do not need to be exchanged or detached when viewing at a distance or near vision, and the lens has no clear borders and is excellent in appearance. It is like that.

Until now, progressive-power lenses have used semi-finished lenses with progressive-reflecting surfaces pre-processed on the outer surface because of the need for manufacturing simplicity and cost reduction. In other words, when creating a spectacle lens by processing the prescription surface on the inner surface of the semifinished lens into a spherical or toric surface according to the spherical power or astigmatism power of the spectacle wearer, the same semi-finished product within a certain prescription power range The lens is shared. By using a semi-finished product lens, it is possible to reduce processing costs and inventory, which plays a major role in cost reduction.

Conventionally, progressive surface shapes with optical performance set at a specific prescription power are shared with different prescription powers, so the optical performance is not limited to the prescription power that is the standard for setting the optical performance of semi-finished lenses at the design stage. There was a case where it deteriorated. In recent years, with the development of aspherical processing technology, it has become possible to process aspherical surfaces, particularly complex aspherical surfaces such as free-form surfaces, in a short time. As a result, it has become possible to process a prescription surface, which has been a spherical surface or a toric surface, into an aspherical shape or a progressive surface shape that takes into account the wearer's prescription and lens shape for each lens.

Therefore, recently, an inner surface progressive addition lens in which a progressive surface is arranged on the inner surface as a prescription surface and a progressive addition lens in which both the outer surface and the inner surface are aspherical have been commercialized. . In particular, a double-sided progressive-power lens that progressively forms the outer surface and inner surface has the potential to improve optical performance and generate progressive-power lenses with new optical performance that were difficult with conventional single-sided progressive-power lenses. Therefore, it is attracting attention as an important technology.

For example, in Patent Document 1, astigmatism is improved as compared with a conventional progressive-power lens, and the magnification difference due to the difference in refractive power between the distance portion and the near portion is improved. In order to reduce distortion, an inner surface progressive addition lens with a progressive surface on the inner surface and a progressive surface with a surface addition of negative or positive value on the outer surface are arranged to increase the positive addition on the inner surface. A technique of a double-sided progressive-power lens in which a progressive surface having the same is arranged is disclosed.

In Patent Document 2, as a double-sided progressive addition lens in which progressive surfaces are arranged on both the outer surface and the inner surface, one of the surfaces is a progressive surface having a positive addition and the other has a negative addition. A technique has been disclosed in which a progressive surface is used to cancel the astigmatism generated on the progressive surface with the astigmatism generated on the progressive surface, thereby reducing the aberration of light transmitted through the lens.

Japanese Patent No. 3800629 JP 2000-249992 A

The conventional progressive-power lens has been evaluated mainly by the optical performance of the surface refractive power of the progressive surface such as the distribution of surface astigmatism on the progressive surface and the distribution of surface average refractive power.

However, with a progressive power lens, the optical performance of the surface refractive power of the progressive surface (hereinafter referred to as “optical performance of the refractive surface”) and the light beam equivalent to the line of sight when the wearer uses the progressive power lens. The optical performance (hereinafter referred to as “optical performance of transmitted light”) is almost the same.

That is, it can be considered that the optical performance of the refracting surface and the optical performance of the transmitted light are almost equal for light incident at an angle close to perpendicular to the lens surface. However, in the case of light rays that are incident at an angle with respect to the normal of the lens surface, even if the lens surface is spherical, astigmatism, average refractive power error, etc. when the light rays pass through the lens surface Therefore, the optical performance of the refracting surface and the optical performance of the transmitted light do not match. Such a tendency increases as the incident angle of the light ray on the lens surface increases, and the various aberrations occur on the outer surface and the inner surface of the lens, respectively.

This discrepancy between the optical performance of the refracting surface and the optical performance of the transmitted light is due to prescription values such as spherical power, astigmatism power, addition power, prism prescription, and lens usage conditions such as frame shape and object distance. In addition, the optical performance of the progressive power lens when it is actually worn depends on the outer surface because it varies depending on the combination of various conditions such as lens shape conditions such as base curve and progressive surface addition. It is difficult to simply evaluate the optical performance of the refracting surface of the progressive surface set on the inner surface.

In order to solve such problems, the optical performance of the transmitted light in consideration of the prescription and usage of the wearer, not the optical performance of the refracting surface of the progressive surface as in the past, is the target progressive refractive power. It is necessary to optimize the optical performance of so-called transmitted light (hereinafter simply referred to as “optimization”) to improve the lens so that it is closer to the optical performance of the lens, and to determine the shape of the correction surface of the progressive-power lens. is there.

The purpose of the aspect of the present invention is to optimize the optical performance of transmitted light in consideration of the wearer's prescription and usage conditions, etc. It is an object of the present invention to provide a progressive power lens and a progressive power lens series which are equal to a specified value and can keep the optical performance of transmitted light good.

A progressive-power lens according to an aspect of the present invention has an outer surface that is a refractive surface on the object side in a worn state and an inner surface that is a refractive surface on the eyeball side in a worn state, and at least of the outer surface and the inner surface One is provided at the upper position of the lens in the wearing state and is relatively suitable for far vision, and the near part is provided at the lower position of the lens in the wearing state and relatively suitable for near vision; A progressive portion that is provided between the distance portion and the near portion, and whose surface refractive power changes progressively between the distance portion and the near portion, of the outer surface and the inner surface One of these is a reference surface having a predetermined surface shape, the other is a correction surface, the distance power specified by the prescription value is S, the astigmatism power specified by the prescription value is C, and the addition power specified by the prescription value Is the add, and the surface average refractive power at the near reference point of the reference surface and the reference surface The surface addition of the reference surface, which is the difference from the surface average refractive power at the distance reference point, is ADDb (S, C, add), and the surface average refraction at the near reference point of the correction surface. When the addition power of the correction surface, which is the difference between the force and the surface average refractive power at the distance reference point of the correction surface, is ADDc (S, C, add),

It satisfies the following conditional expression.

Progressive-power lenses have the advantage that the greater the add power, the less the adjustment power required for near vision, but the various aberrations that occur in the entire lens occur almost in proportion to the value of the add power. Therefore, the larger the wearing addition, the more aberration and image distortion occur.

This is also the case when optimizing the optical performance of transmitted light. If the addition of the lens is greater than the addition specified by the prescription value, then the lens optimized with the original desired addition is used. However, the optical performance of transmitted light such as astigmatism and image distortion is inferior. Therefore, it is necessary to set the addition power of the progressive-power lens equal to the addition power specified by the prescription required for the wearer.

However, as in the conventional progressive addition lens, the sum of the surface addition ADDb (S, C, add) on the reference surface and the surface addition ADDc (S, C, add) on the correction surface is used as the addition of the entire lens. It was found that, when set equal to the addition add designated by the prescription, the wearing addition ADD in the transmitted light when the lens is actually worn becomes larger than the prescription addition add.

Therefore, in the above aspect of the present invention, the addition add in which the sum of the surface addition ADDb (S, C, add) on the reference surface and the surface addition ADDc (S, C, add) on the correction surface is designated by the prescription value. By optimizing the optical performance of the transmitted light in consideration of the wearer's prescription and usage situation, the diopter power and addition power, which are important specifications in the progressive power lens, It is possible to make the optical performance of the transmitted light closer to the optical performance of the target progressive-power lens by making it equal to the value specified by the prescription value. Note that the optimization of the optical performance of the transmitted light in the above aspect of the present invention is preferably performed in consideration of the influence of the rotational movement of the eye due to the law of listing. In the above conditional expression, the unit of refractive power is represented by diopter (D) unless otherwise specified.

In the above aspect, the plurality of progressive-power lenses can be formed such that the surface addition of each of the reference surfaces has a constant value and the surface addition of each of the correction surfaces becomes a variable. .

In this case, the surface addition on one side is kept constant and the sum of the surface additions on both sides is adjusted while changing the surface addition on the other side. Since it becomes easy to adjust the sum of the degrees, it becomes easy to make the wearing addition ADD of the lens equal to the prescription addition add.

In the above aspect, the plurality of progressive-power lenses have a constant surface average refractive power at the distance reference point of each of the reference surfaces, and the surface average power at the distance reference point of each of the correction surfaces. It can be configured to be a variable.

In this case, the surface average refractive power of the distance reference point on one surface is made constant, and the surface average of the distance reference point on both surfaces is changed while changing the surface average refractive power of the distance reference point on the other surface. By adjusting the sum of the refractive powers, it is easy to adjust the sum of the surface average refractive powers of the distance reference points on both surfaces while reducing the cost. It becomes easy to make it equal to the distance power specified by the prescription value.

The progressive-power lens according to the aspect of the present invention is a progressive-power lens included in a progressive-power lens series corresponding to a plurality of different prescriptions, and includes an outer surface serving as a refractive surface on the object side in a worn state, and a worn state And an inner surface which is a refractive surface on the eyeball side, and at least one of the outer surface and the inner surface is provided at a position above the lens in a wearing state, Provided in the lower position of the lens in a state, relatively suitable for near vision, provided between the distance portion and the near portion, between the distance portion and the near portion A progressive portion whose surface refractive power changes progressively, and one of the outer surface and the inner surface is a reference surface having a predetermined surface shape, and the other is a correction surface, and is for distance use specified by a prescription value When the frequency is S, and the distance power is S, The power is C (S), the addition power specified by the prescription value is add (S), the surface average power at the near reference point of the reference surface and the surface average power at the distance reference point of the reference surface The surface addition power of the reference surface, which is the difference between the correction surface, and ADDb (S), the difference between the surface average refractive power at the near reference point of the correction surface and the surface average refractive power at the distance reference point of the correction surface The surface addition of the correction surface is ADDc (S), and the astigmatism power C (S), the addition add (S), and the surface addition of the reference surface are included in the progressive power lens series. In a progressive-power lens having the same power ADDb (S), Sp is the distance power when the addition power ADDc (S) of the correction surface takes the maximum value, and from the progressive-power lens series, A first progressive-power lens whose power is the first distance power Sl, and the distance power Is selected as the second progressive power lens having the second distance power Sh larger than the first distance power S1, the astigmatism power C (Sl) and the addition power in the first progressive power lens are selected. add (Sl), surface addition ADDb (Sl) of the reference surface and surface addition ADDc (Sl) of the correction surface, and the astigmatism power C (Sh) and addition of the second progressive addition lens Degree add (Sh), surface addition ADDb (Sh) of the reference surface, and surface addition ADDc (Sh) of the correction surface,
C (Sh) = C (Sl),
add (Sh) = add (Sl),
ADDb (Sh) = ADDb (Sl)
When
When Sp ≦ Sl,

Is satisfied,
When Sp ≧ Sh,

It satisfies the following conditional expression.

As described above, the progressive addition lens has an advantage that the greater the addition, the less adjustment power necessary for near vision is required, but various aberrations occurring in the entire lens are almost equal to the addition value. Since they occur proportionally, the larger the wearing addition, the greater the aberrations and image distortion that occur.

This is also the case when optimizing the optical performance of transmitted light. If the addition of the lens is greater than the addition specified by the prescription value, then the lens optimized with the original desired addition is used. However, the optical performance of transmitted light such as astigmatism and image distortion is inferior.

On the other hand, when the addition is small, the optical performance of the transmitted light is relatively good, but the original function as a progressive power lens is insufficient because the refractive power of the near part of the lens necessary for near vision is insufficient. Will not be satisfied.

Therefore, the wearing power of all progressive power lenses included in the progressive power lens series set so that the optical effects on the lens wear and the basic specifications of the lenses are equal is necessary for the wearer. It is necessary to set it equal to the addition specified by the prescription.

According to the above aspect of the present invention, the astigmatic power C specified by the prescription value is equal between the first progressive power lens and the second progressive power lens among the plurality of progressive power lenses, and the prescription value When the specified addition add is equal and the surface addition ADDb of the reference surface is equal, when Sp ≦ Sl, the surface addition ADDc of each correction surface decreases as the distance power S increases, and Sp ≧ Sh In this case, the surface addition ADDc of each correction surface is set to decrease as the distance power S decreases. In this way, by optimizing the optical performance of the transmitted light in consideration of the wearer's prescription and usage conditions so as to satisfy the above relationship when comparing any two of the plurality of progressive-power lenses It is possible to improve the addition power, which is an important specification in the progressive power lens, to be equal to the value specified in the prescription value and to make the optical performance of the transmitted light closer to the optical performance of the target progressive power lens. It has become possible. As a result, the optical effects on lens wearing and the basic specifications of the lens can be made equal in the lens series. In addition, it is preferable to optimize the optical performance of the transmitted light in the present invention in consideration of the influence of the rotational movement of the eye due to the law of listing. In the above conditional expression, the unit of refractive power is represented by diopter (D) unless otherwise specified.

The progressive-power lens according to the aspect of the present invention is a progressive-power lens included in a progressive-power lens series corresponding to a plurality of different prescriptions, and includes an outer surface serving as a refractive surface on the object side in a worn state, and a worn state And an inner surface which is a refractive surface on the eyeball side, and at least one of the outer surface and the inner surface is provided at a position above the lens in a wearing state, Provided in the lower position of the lens in a state, relatively suitable for near vision, provided between the distance portion and the near portion, between the distance portion and the near portion A progressive portion whose surface refractive power changes progressively, and one of the outer surface and the inner surface is a reference surface having a predetermined surface shape, and the other is a correction surface, and is for distance use specified by a prescription value When the frequency is S, and the distance power is S, The power is C (S), the addition power specified by the prescription value is add (S), the surface average power at the near reference point of the reference surface and the surface average power at the distance reference point of the reference surface The surface addition power of the reference surface, which is the difference between the correction surface, and ADDb (S), the difference between the surface average refractive power at the near reference point of the correction surface and the surface average refractive power at the distance reference point of the correction surface The addition power of the correction surface is ADDc (S), and from the progressive power lens series, the first progressive power lens whose distance power is the first distance power Sl, and the distance use When the second progressive power lens whose power is the second distance power Sh larger than the first distance power S1 is selected, the astigmatism power C (Sl) in the first progressive power lens, the addition Degree add (Sl), surface addition ADDb (Sl) of the reference surface, and surface addition A of the correction surface Each of Dc (Sl), the astigmatism power C (Sh), the addition power add (Sh), the surface addition power ADDb (Sh) of the reference surface and the surface addition of the correction surface in the second progressive addition lens. For each of the degrees ADDc (Sh)
C (Sh) = C (Sl),
add (Sh) = add (Sl),
ADDb (Sh) = ADDb (Sl),
And
0 ≦ Sl
When

It satisfies the following conditional expression.

According to the above aspect of the present invention, the astigmatic power C specified by the prescription value is equal between the first progressive power lens and the second progressive power lens among the plurality of progressive power lenses, and the prescription value When the specified addition add is equal and the surface addition ADDb of the reference surface is equal, when 0 ≦ S1, the surface addition ADDc of the correction surface is set to decrease as the distance power S increases. It was. In this way, by optimizing the optical performance of the transmitted light in consideration of the wearer's prescription and usage conditions so as to satisfy the above relationship when comparing any two of the plurality of progressive-power lenses It is possible to improve the addition power, which is an important specification in the progressive power lens, to be equal to the value specified in the prescription value and to make the optical performance of the transmitted light closer to the optical performance of the target progressive power lens. It has become possible. As a result, the optical effects on lens wearing and the basic specifications of the lens can be made equal in the lens series. Note that the optimization of the optical performance of the transmitted light in the above aspect of the present invention is preferably performed in consideration of the influence of the rotational movement of the eye due to the law of listing. Also in the above conditional expression, the unit of refractive power is represented by diopter (D) unless otherwise specified.

According to the aspect of the present invention, the optical power of the transmitted light is optimized in consideration of the wearer's prescription and usage conditions, and the addition, which is an important specification in the progressive power lens, is determined by the prescription value. It is possible to make the optical performance of the transmitted light closer to the optical performance of the target progressive-power lens by making it equal to the specified value.

The figure which shows the outline | summary of the area | region division in the progressive-power lens which concerns on embodiment of this invention. The schematic diagram which showed the way of the light ray of the spectacles lens in a wearing state.

Embodiments of the present invention will be described. In the following description, the unit of refractive power is represented by diopter (D) unless otherwise specified. Further, in the following description, when the progressive power lens is described as “upper”, “lower”, “upper”, “lower”, etc., the glasses are used when the progressive power lens is processed for spectacles. It is based on the positional relationship of the lenses when worn. Also in the following drawings, the positional relationship (up / down / left / right) of the lens is the same as the positional relationship (up / down / left / right) with respect to the paper surface. Of the two refracting surfaces constituting the lens, the object side surface is referred to as an “outer surface” and the eyeball side surface is referred to as an “inner surface”.

FIG. 1 is a diagram showing an outline of region division in the progressive-power lens according to the present embodiment.
As shown in FIG. 1, the progressive addition lens LS is in a state before processing the lens according to the shape of the spectacle frame (a state before lashing processing), and is formed in a circular shape in plan view. . The progressive-power lens LS is arranged on the upper side in the figure when worn, and the lower side in the figure is arranged on the lower side when worn. The progressive addition lens LS has a distance portion F, a near portion N, and a progressive portion P. The progressive power lens series according to this embodiment is configured by combining a plurality of such progressive power lenses LS.

The distance portion F is disposed above the progressive addition lens LS, and after the progressive addition lens LS is processed for spectacles, it becomes a portion suitable for relatively far vision. The near portion N is disposed below the progressive power lens LS, and becomes a portion suitable for near vision after the progressive power lens LS is processed for spectacles. The progressive portion P is disposed between the distance portion F and the near portion N in the progressive power lens LS, and the surface refractive power between the distance portion F and the near portion N is progressively changed. It is a part to be made.

The progressive power lens LS has a plurality of reference points. Examples of such a reference point include an eye point (also called a fitting point) EP, an optical center point OG, a distance reference point OF, and a near reference point ON, as shown in FIG. The eye point EP is a reference point when the wearer wears the lens. The optical center point OG is the center point of the optical characteristics of the lens.

The distance reference point OF is a measurement reference point for measuring the distance power of the lens in the distance portion F. The near reference point ON is a measurement reference point for measuring the near power of the lens in the near portion N. The surface average refractive power at the distance reference point OF or the surface average power at the near reference point ON is set based on the distance power or near power specified by the prescription value, respectively.

In the present embodiment, a value obtained by subtracting the surface average refractive power of the near reference point OF from the surface average refractive power of the near reference point ON measured by the progressive addition lens LS is expressed as “surface addition power”. . On the other hand, the addition specified by the prescription value is “prescription addition”, and the average refractive power DN of the transmitted light LN passing through the near reference point ON of the lens to the average of the transmitted light LF passing through the distance reference point OF. A value obtained by subtracting the refractive power DF is referred to as “wear addition power”.

The progressive addition lens LS has a main gaze MM 'that passes through the distance reference point OF and the near reference point ON and divides the refractive surface of the progressive surface into a nose side region and an ear side region. The main gazing line MM 'is also called a main meridian and is used as an important reference line in designing a progressive surface. The main gazing line is defined as a curve curved to the nose side from the distance portion F to the near portion N in consideration of the convergence at the near vision in the progressive power lens of the asymmetric design, and the progressive power lens of the symmetric design. Is defined as a straight line passing through the distance reference point OF and the near reference point ON.

FIG. 2 is a schematic diagram showing how light rays of the progressive-power lens LS pass in the wearing state.
In FIG. 2, an arbitrary light beam L corresponding to the line of sight of the wearer passes through a point O1 on the lens surface M1 that is the outer surface, a point O2 on the lens surface M2 that is the inner surface, and the rotation point RC of the eyeball. An image is formed at a point OR on R. When the light ray passes through the point O1 and the point O2, it is refracted according to the incident angle with respect to each point. Similarly, the light beam LF passing through the distance reference point corresponding to the line of sight of the wearer passes through the distance reference point OF1 on the lens surface M1 which is the outer surface and the distance reference point OF2 on the lens surface M2 which is the inner surface. Further, an image is formed at a point ORf on the retina R of the eyeball through the rotation point RC of the eyeball. When the light ray passes through the point OF1 and the point OF2, it is refracted according to the incident angle with respect to each point.

The light beam LN passing through the near reference point corresponding to the line of sight of the wearer passes through the near reference point ON1 on the lens surface M1 that is the outer surface and the near reference point ON2 on the lens surface M2 that is the inner surface. An image is formed at a point ORn on the retina R of the eyeball through the rotation point RC of the eyeball. When the light beam passes through the points ON1 and ON2, it is refracted according to the incident angle with respect to each point. In this embodiment, the lens surface M1 that is an outer surface is used as a reference surface, and the lens surface M2 that is an inner surface is described as a correction surface formed in an aspherical shape in order to correct the optical performance of transmitted light.

The light beam L corresponding to the line of sight of the wearer hardly enters the lens surface perpendicularly except for the light beam passing through the vicinity of the optical axis OA of the lens, and the position where the light beam enters the lens surface is the position of the lens. As the distance from the optical axis increases, the incident angle on the lens surface tends to increase. In other words, various aberrations are caused by light rays passing through the periphery of the lens surface.

Further, the distance reference point OF1 and the near reference point ON1 on the lens surface M1, and the distance reference point OF2 and the near reference point ON2 on the lens surface M2 are usually lens surfaces through which the optical axis OA of the lens passes. The positions are set apart from the optical center OG1 on M1 and the optical center OG2 on the lens surface M2. That is, the light beam LF and the light beam LN do not enter the lens surface perpendicularly, and aberration occurs even in light beams passing through the distance reference point and the near reference point.

In the present embodiment, as described above, the lens surface M1 that is the outer surface is used as the reference surface, the lens surface M2 that is the inner surface is used as the correction surface, and the distance power specified by the prescription value is S and is specified by the prescription value. When the astigmatism power is C and the prescription addition power is add, the surface average refractive power of the reference surface M1 at the near reference point ON1 and the surface average refractive power of the reference surface M1 at the distance reference point OF1 The surface addition power of the reference surface M1, which is the difference, is ADDb (S, C, add), and the surface average refractive power at the near reference point ON2 of the correction surface M2 and the surface at the distance reference point OF2 of the correction surface M2 When the addition power of the correction surface M2, which is the difference from the average refractive power, is ADDc (S, C, add), the progressive addition lens LS is formed so as to satisfy the following conditional expression (1).

In the range indicated by the expression (1), the progressive addition lens LS is preferably formed so as to satisfy the following conditional expression (2), and satisfies the following conditional expression (3). More preferably, it is formed. Furthermore, it is more preferable that it is formed so as to satisfy the following conditional expression (4).

In the present embodiment, it is possible to make a progressive power lens series by combining a plurality of such progressive power lenses LS. In such a case, when forming the progressive addition lens LS so as to satisfy the conditional expressions shown in the above formulas (1) to (4), for example, the surface addition ADDb (S, C, (add) is a constant value, and the surface addition ADDc (S, C, add) of the correction surface M2 can be used as a variable. By adjusting the sum of the surface additions of both surfaces while keeping the surface addition of one surface constant and changing the surface addition of the other surface, the sum of the surface additions of the both surfaces can be reduced while reducing costs. Therefore, it is easy to make the lens addition ADD and the prescription addition add equal.

In the above case, the surface average refractive power of the reference surface M1 at the distance reference point OF1 is PFb (S, C, add), and the surface average refractive power of the correction surface M2 at the distance reference point OF2 is PFc. Assuming that (S, C, add), the progressive addition lens LS is formed so that the following conditional expression (5) is satisfied when S ≧ 0, and the following conditional expression (6) is satisfied when S <0. It is preferable that

When the distance dioptric power S specified by the prescription value takes a positive value in the formula (5), the surface average refractive power at the distance reference point OF1 on the reference surface M1 as in the conventional progressive power lens. If the sum of PFb (S, C, add) and the surface average refractive power PFc (S, C, add) at the distance reference point OF2 on the reference surface M2 is made equal to the distance power S, The average refractive power DF of the transmitted light beam LF passing through the distance reference points OF1 and OF2 takes a value larger than the distance power S (DF−S> 0). Therefore, in order to make the average refractive power DF equal to the distance power S, it is necessary to make the sum of the surface average power PFb and the surface average power PFc smaller than the distance power S. It becomes.

In the expression (6), when the distance diopter S takes a negative value, the surface average refractive power PFb (S, C, add) and the surface average refraction as in the conventional progressive-power lens. If the sum of the force PFc (S, C, add) is made equal to the distance power S, the average refractive power DF takes a value smaller than the distance power S specified by the prescription value. (DF-S <0). Therefore, in order to make the average refractive power DF equal to the distance power S, the sum of the surface average power PFb and the surface average power PFc needs to be larger than the distance power S. It becomes.

Further, in this case, the progressive addition lens LS is formed so that the conditional expression (7) below is satisfied when S> 0, and the conditional expression (8) below is satisfied when S <0. Is preferred.

When the distance reference points OF1 and OF2 are set at positions relatively close to the optical centers OG1 and OG2, respectively, and the distance power S = 0, the value of the conditional expression is considered when taking into account the lens tolerance May be zero or a value that can be considered zero. In consideration of this point, as a condition of Expression (7), it is preferable to set a portion where S ≧ 0 in (Expression 8) to a range that does not include S> 0 and zero.

Further, when a plurality of progressive addition lenses LS are combined to form a progressive addition lens series, when adjusting the range shown in the above equations (5) to (8), for example, on the reference plane M1 The surface average refractive power PFb (S, C, add) of the distance reference point OF1 is a constant value, and the surface average refractive power PFc (S, C, add) of the distance reference point OF2 on the correction surface M2 is a variable. Can be adjusted. In this way, the surface average refractive power of the distance reference point OF on one surface is made constant, and the distance reference point OF on both surfaces is changed while changing the surface average power of the distance reference point OF on the other surface. By adjusting the sum of the surface average refracting powers, it is easy to adjust the sum of the surface average refracting powers of the distance reference points OF on both surfaces while reducing the cost. It becomes easy to make the average refractive power DF of L equal to the distance power S designated by the prescription value.

As described above, according to the present embodiment, the sum of the surface addition ADDb (S, C, add) on the reference surface and the surface addition ADDc (S, C, add) on the correction surface is designated by the prescription value. By optimizing the optical performance of the transmitted light in consideration of the wearer's prescription and usage conditions, the diopter power is an important specification for progressive power lenses. It has become possible to make the addition power equal to the value specified by the prescription value and improve the optical performance of the transmitted light so as to be closer to the optical performance of the target progressive-power lens.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, in the present embodiment, the outer surface M1 of the outer surface M1 and the inner surface M2 is the reference surface and the inner surface M2 is the correction surface. However, the present invention is not limited to this. For example, the inner surface M2 is the reference surface, and the outer surface M1 is Even in the configuration of the correction surface, the range of the above formulas (1) to (8) can be applied.

An example of the present invention will be described with reference to Table 1.

Table 1 shows the refractive index n of the progressive-power lens, the distance power S specified by the prescription value, the astigmatism power C indicated by the prescription value, the prescription addition add, and the surface addition ADDb (S, C at the reference surface). , Add), surface addition ADDc (S, C, add) on the correction surface, and value ADDb (S, C, add) obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface add) + ADDc (S, C, add) −add, surface average refractive power PFb (S, C, add) at the distance reference point on the reference surface, surface average power PFc (S, C) at the distance reference point on the correction surface C, add), a value obtained by subtracting the distance power S from the sum of the surface average refractive power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface PFb (S, C, add) + PFc (S, C, add) -S, lens wearing addition A D, and shows an average refractive power DF of transmitted light passing through a far vision reference point, respectively.

In this example, as shown in Table 1, progressive power lenses shown in Examples 1 to 13 were manufactured. The progressive-power lenses shown in Examples 1 to 10 are common in that the optical refractive index n is 1.67 and the astigmatism power C is 0.00.

Example 1
In Example 1, the distance power S is 5.00, the prescription addition add is 3.50, the surface addition ADDb (S, C, add) on the reference surface is 4.00, and the surface addition ADDc ( S, C, add) is -1.02, surface average refractive power PFb (S, C, add) at the reference point for distance on the reference surface is 6.27, surface average power PFc at the reference point for distance on the correction surface (S, C, add) was set to −1.62.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .52. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was -0.35.

At this time, the value of the wear addition ADD is equal to the prescription addition add, and the average refractive power DF of the transmitted light passing through the distance reference point is equal to the distance diopter S designated by the prescription value. Was able to be achieved.

(Example 2)
In Example 2, the distance power S is 3.00, the prescription addition add is 1.00, the surface addition ADDb (S, C, add) on the reference surface is 1.50, and the surface addition ADDc ( S, C, add) is −0.59, the surface average refractive power PFb (S, C, add) at the reference point for distance on the reference surface is 6.27, and the surface average power PFc at the reference point for distance on the correction surface (S, C, add) was set to -3.44.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .09. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was -0.17.

(Example 3)
In Example 3, the distance power S is 2.00, the prescription addition add is 0.75, the surface addition ADDb (S, C, add) on the reference plane is 1.50, and the surface addition ADDc ( S, C, add) is −0.88, the surface average refractive power PFb (S, C, add) at the distance reference point of the reference surface is 4.39, and the surface average power PFc at the distance reference point of the correction surface (S, C, add) was set to -2.50.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .13. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was -0.11.

Example 4
In Example 4, the distance power S is 0.00, the prescription addition add is 2.00, the surface addition ADDb (S, C, add) on the reference surface is 2.50, and the surface addition ADDc ( S, C, add) is −0.66, the surface average refractive power PFb (S, C, add) at the distance reference point on the reference surface is 4.39, and the surface average power PFc at the distance reference point on the correction surface is (S, C, add) was set to -4.42.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .16. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was -0.03.

(Example 5)
In Example 5, the distance power S is -1.00, the prescription addition add is 3.50, the surface addition ADDb (S, C, add) on the reference surface is 4.00, and the surface addition ADDc on the correction surface. (S, C, add) is -0.83, the surface average refractive power PFb (S, C, add) at the distance reference point of the reference surface is 2.51, and the surface average power at the distance reference point of the correction surface PFc (S, C, add) was set to -3.47.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .33. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was 0.04.

(Example 6)
In Example 6, the distance power S is −3.00, the prescription addition add 2.00, the surface addition ADDb (S, C, add) on the reference surface is 2.50, and the surface addition ADDc on the correction surface. (S, C, add) is -0.70, surface average refractive power PFb (S, C, add) at the reference point for distance on the reference surface is 2.51, surface average refractive power at the reference point for distance on the correction surface PFc (S, C, add) was set to −5.42.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .20. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was 0.09.

(Example 7)
In Example 7, the distance diopter S is -5.00, the prescription addition add is 1.00, the surface addition ADDb (S, C, add) on the reference surface is 1.50, and the surface addition ADDc on the correction surface. (S, C, add) is -0.68, surface average refractive power PFb (S, C, add) at the reference point for distance on the reference surface is 2.51, surface average refractive power at the reference point for distance on the correction surface PFc (S, C, add) was set to −7.40.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .18. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was 0.11.

(Example 8)
In Example 8, the distance power S is −6.00, the prescription addition add is 0.75, the surface addition ADDb (S, C, add) on the reference surface is 1.50, and the surface addition ADDc on the correction surface. (S, C, add) is −0.91, surface average refractive power PFb (S, C, add) at the reference point for distance on the reference surface is 1.25, surface average refractive power at the reference point for distance on the correction surface PFc (S, C, add) was set to −7.08.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .16. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was 0.17.

Example 9
In Example 9, the distance diopter S is −8.00, the prescription addition add is 1.75, the surface addition ADDb (S, C, add) on the reference surface is 2.50, and the surface addition ADDc on the correction surface. (S, C, add) is -1.17, surface average refractive power PFb (S, C, add) at the reference point for distance on the reference surface is 1.25, surface average refractive power at the reference point for distance on the correction surface PFc (S, C, add) was set to −9.09.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .42. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was 0.16.

(Example 10)
In Example 10, the diopter power S is −10.00, the prescription addition add is 3.25, the surface addition ADDb (S, C, add) on the reference plane is 4.00, and the surface addition ADDc on the correction plane. (S, C, add) is -1.51, surface average refractive power PFb (S, C, add) at the distance reference point of the reference surface is 1.25, surface average power at the distance reference point of the correction surface PFc (S, C, add) was set to -11.13.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .76. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was 0.12.

At this time, the value of the wear addition ADD is equal to the prescription addition add, and the average refractive power DF of the transmitted light passing through the distance reference point is equal to the distance diopter S designated by the prescription value. Was able to be achieved.
Example 11
In Example 11, the refractive index n is 1.60, the distance diopter S is −10.00, the prescription addition add is 3.25, and the surface addition ADDb (S, C, add) at the reference plane is 4.00. The surface addition ADDc (S, C, add) on the correction surface is -1.59, the surface average refractive power PFb (S, C, add) at the distance reference point on the reference surface is 1.13, the distance on the correction surface is The surface average refractive power PFc (S, C, add) at the reference point for use was set to -11.04.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .84. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was 0.09.

(Example 12)
In Example 12, the refractive index n is 1.74, the distance diopter S is −10.00, the prescription addition add is 3.25, and the surface addition ADDb (S, C, add) at the reference plane is 4.00. The surface addition ADDc (S, C, add) on the correction surface is -1.44, the surface average refractive power PFb (S, C, add) at the distance reference point on the reference surface is 1.38, the distance on the correction surface is The surface average refractive power PFc (S, C, add) at the reference point for use was set to -11.23.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .69. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was 0.15.

(Example 13)
In Example 13, the refractive index n is 1.74, the distance diopter S is −12.00, the prescription addition add is 3.25, and the surface addition ADDb (S, C, add) at the reference plane is 4.00. The surface addition ADDc (S, C, add) on the correction surface is −1.69, the surface average refractive power PFb (S, C, add) at the distance reference point on the reference surface is 1.38, and the distance on the correction surface is The surface average refractive power PFc (S, C, add) at the reference point for use was set to -13.28.

In this case, a value ADDb (S, C, add) + ADDc (S, C, add) −add obtained by subtracting the value of the addition from the sum of the surface addition on the reference surface and the surface addition on the correction surface is −0. .94. Further, a value PFb (S, C, add) + PFc (S) obtained by subtracting the distance power S from the sum of the surface average power at the distance reference point of the reference surface and the surface average power at the distance reference point of the correction surface. , C, add) -S was 0.10.

In all of Examples 1 to 13, the results (1) to (8) in the above embodiment were satisfied. Therefore, as shown in the above embodiment, the refractive index n of the progressive power lens, the distance power S specified by the prescription value, the astigmatism power C specified by the prescription value, the prescription addition add, and the surface addition power at the reference plane ADDb (S, C, add), surface addition ADDc (S, C, add) on the correction surface, surface average refractive power PFb (S, C, add) at the distance reference point OF of the reference surface, distance of the correction surface By setting the surface average refractive power PFc (S, C, add) at the reference point OF, it is possible to make the distance power and addition, which are the most important specifications of the progressive power lens, equal to the values specified in the prescription. The optical performance of transmitted light can be kept good.

Moreover, between Example 1, Example 5, and Example 10, Between Example 2, Example 3, Example 7, and Example 8, Between Example 4, Example 6, and Example 9. Then, the surface addition ADDb (S, C, add) on the reference surface is equal, and only the surface addition ADDc (S, C, add) on the correction surface is different.

Thus, the surface addition ADDb (S, C, add) on the reference surface is set to a constant value, and the surface addition ADDc (S, C, add) on the correction surface is used as a variable, and ADDb (S, C, add). It is also possible to adjust the value of + ADDc (S, C, add) −add. By adjusting the sum of the surface additions of both surfaces while keeping the surface addition of one surface constant and changing the surface addition of the other surface, it becomes easier to adjust the sum of the surface additions of both surfaces, It can be adjusted to a more preferable value.

Moreover, between Example 1 and Example 2, between Example 3 and Example 4, between Example 5, Example 6 and Example 7, Example 8, Example 9 and Example 10. , The surface average refractive power PFb (S, C, add) at the distance reference point of the reference surface is equal, and the surface average power PFc (S, C, add) at the distance reference point of the correction surface is the same. only add) is different.

Thus, the surface average refractive power PFb (S, C, add) at the distance reference point on the reference surface is set to a constant value, and the surface average power PFc (S, C, add) at the distance reference point on the correction surface is set. It is also possible to adjust the value of PFb (S, C, add) + PFc (S, C, add) −S, using as a variable. Adjusting the sum of the surface average refractive powers at the distance reference points on both sides while changing the surface average power at the distance reference point on the other surface while keeping the surface average power at one distance reference point constant. Thus, the sum of the surface average refractive powers at the distance reference points on both surfaces can be easily adjusted, and can be adjusted to a more preferable value.

Next, another embodiment of the present invention will be described. Note that the description of the same components as those in the above-described embodiment is omitted or simplified.

In FIG. 2, as described above, an arbitrary light beam L corresponding to the line of sight of the wearer has a point O1 on the lens surface M1 that is the outer surface, a point O2 on the lens surface M2 that is the inner surface, and the rotation point RC of the eyeball. It forms an image at a point OR on the retina R of the eyeball. When the light ray passes through the point O1 and the point O2, it is refracted according to the incident angle with respect to each point. Similarly, the light beam LF passing through the distance reference point corresponding to the line of sight of the wearer passes through the distance reference point OF1 on the lens surface M1 which is the outer surface and the distance reference point OF2 on the lens surface M2 which is the inner surface. Further, an image is formed at a point ORf on the retina R of the eyeball through the rotation point RC of the eyeball. When the light ray passes through the point OF1 and the point OF2, it is refracted according to the incident angle with respect to each point.

In the progressive-power lens of this embodiment, the lens surface M1, which is the outer surface, is used as the reference surface, the lens surface M2, which is the inner surface, is used as the correction surface, and the distance power specified by the prescription value is S. When the distance power is S, the astigmatic power specified by the prescription value is C (S), the addition power specified by the prescription value is add (S), and the near reference point ON1 of the reference plane M1 The surface addition power of the reference surface M1, which is the difference between the surface average refractive power and the surface average refractive power at the distance reference point OF1 of the reference surface M1, is ADDb (S), and the surface of the correction surface M2 at the near reference point ON2 The astigmatism included in the progressive power lens series, where ADDc (S) is the addition power of the correction surface M2, which is the difference between the average refractive power and the surface average refractive power at the distance reference point OF1 of the correction surface M2. The power C (S), the addition add (S), and the reference plane In a progressive-power lens having the same addition ADDb (S), the distance dioptric power when the surface addition ADDc (S) of the correction surface M2 takes the maximum value is Sp. A first progressive power lens having a first power diopter S1 and a second progressive power lens Sh having a second power diopter Sh greater than the first power diopter S1. When selected, the astigmatism power C (Sl), the addition power add (Sl), the surface addition power ADDb (Sl) of the reference surface M1, and the surface addition power ADDc (Sl) of the correction surface M2 in the first progressive addition lens, respectively. And astigmatism power C (Sh), addition power add (Sh), surface addition power ADDb (Sh) of the reference surface M1, and surface power addition ADDc (Sh) of the correction surface M2 in the second progressive addition lens. ,
C (Sh) = C (Sl),
add (Sh) = add (Sl),
ADDb (Sh) = ADDb (Sl)
In this case, the progressive addition lens LS is formed so that the following conditional expression (9) is satisfied when Sp ≦ Sl, and the following conditional expression (10) is satisfied when Sp ≧ Sh.

The value of ADDc (S) varies depending on the distance power S according to the set condition, and takes a maximum value at a predetermined distance power Sp. Note that the Sp value when taking the maximum value ADDc (Sp) is exactly one when the distance power S continuously changes, but the distance power S as in a normal progressive-power lens. Is set at a fixed interval and takes a discrete value, the value of Sp may be two. In such a case, out of the two Sps, assuming that the greater distance power is Sph and the smaller distance power is Sp1, the above conditional expression (9) is satisfied when Sph ≦ Sl, It is desirable that the progressive addition lens LS be formed so as to satisfy the conditional expression (10) when Spl ≧ Sh.

In the range indicated by the formula (9), it is preferable that the following conditional formula (11) is further satisfied. Moreover, in the range shown by Formula (10), it is preferable to satisfy the following conditional formula (12).

In addition, in the range shown by Formula (11), it is preferable to satisfy the following conditional formula (13). Moreover, in the range shown by Formula (12), it is preferable to satisfy the following conditional formula (14).

In addition, it is preferable that the following conditional expression (15) is further satisfied within the range indicated by the expression (13).

Further, when the surface average refractive power at the distance reference point OF1 of the reference surface M1 is PFb, it is preferable that the following conditional expression (16) is satisfied.

In addition, in the range shown by Formula (16), it is preferable to satisfy the following conditional formula (17).

In the progressive-power lens of this embodiment, the lens surface M1, which is the outer surface, is used as the reference surface, the lens surface M2, which is the inner surface, is used as the correction surface, and the distance power specified by the prescription value is S. When the distance power is S, the astigmatic power specified by the prescription value is C (S), the addition power specified by the prescription value is add (S), and the near reference point ON1 of the reference plane M1 The surface addition power of the reference surface M1, which is the difference between the surface average refractive power and the surface average refractive power at the distance reference point OF1 of the reference surface M1, is ADDb (S), and the surface of the correction surface M2 at the near reference point ON2 The addition power of the correction surface M2, which is the difference between the average refractive power and the surface average refractive power at the distance reference point OF2 of the correction surface M2, is ADDc (S). A first progressive-power lens whose power is the first distance power S1; When the second progressive power lens Sh having the second distance power Sh larger than the distance power S1 is selected, the astigmatism power C (Sl), the add power add (Sl), and the reference in the first progressive power lens Each of the surface addition ADDb (Sl) of the surface M1 and the surface addition ADDc (Sl) of the correction surface M2, astigmatism power C (Sh), addition add (Sh), and reference surface M1 in the second progressive addition lens For each of the surface addition ADDb (Sh) and the correction surface M2 surface addition ADDc (Sh),
C (Sh) = C (Sl),
add (Sh) = add (Sl),
ADDb (Sh) = ADDb (Sl),
When 0 ≦ Sl, it is preferable that the following conditional expression (18) is satisfied.

In addition, it is preferable that the following conditional expression (19) is further satisfied within the range indicated by the expression (18). Furthermore, it is preferable that the following conditional expression (20) is satisfied.

Further, it is preferable that the following conditional expression (21) is further satisfied within the range indicated by the expression (20).

As described above, according to the present embodiment, the astigmatic power C specified by the prescription value is equal between the first progressive power lens and the second progressive power lens among the plurality of progressive power lenses LS. When the addition add specified by the prescription value is equal and the surface addition ADDb of the reference surface is equal, when Sp ≦ Sl, the surface addition ADDc of each correction surface decreases as the distance power S increases. When Sp ≧ Sh, the surface addition ADDc of each correction surface is set to decrease as the distance power S decreases.

According to the present embodiment, the astigmatism power C specified by the prescription value is equal between the first progressive power lens and the second progressive power lens among the plurality of progressive power lenses, and the prescription value When the specified addition add is equal and the surface addition ADDb of the reference surface is equal, when 0 ≦ S1, the surface addition ADDc of the correction surface is set to decrease as the distance power S increases. It was.

In this way, by optimizing the optical performance of the transmitted light in consideration of the wearer's prescription and usage conditions so as to satisfy the above relationship when comparing any two of the plurality of progressive-power lenses It is possible to improve the addition power, which is an important specification in the progressive power lens, to be equal to the value specified in the prescription value and to make the optical performance of the transmitted light closer to the optical performance of the target progressive power lens. It has become possible. As a result, the optical effects on lens wearing and the basic specifications of the lens can be made equal in the lens series.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, in the present embodiment, the outer surface M1 of the outer surface M1 and the inner surface M2 is the reference surface and the inner surface M2 is the correction surface. However, the present invention is not limited to this. For example, the inner surface M2 is the reference surface, and the outer surface M1 is The conditional expressions (9) to (21) can be applied even with the configuration of the correction surface.

(Example 14)
Example 14 of the present invention will be described with reference to Table 2.

Table 2 shows the distance power designated by the prescription value for the first progressive-power lens, the surface addition ADDc (Sl) on the correction surface, and the distance-use designated by the prescription value for the second progressive-power lens. The power Sh, the surface addition ADDc (Sh) on the correction surface, the surface addition ADDc (Sh) on the correction surface of the second progressive-power lens, and the surface addition ADDc (Sl) on the correction surface of the first progressive-power lens Is divided by the difference between the distance power Sh specified by the prescription value for the second progressive power lens and the distance power Sl specified by the prescription value for the first progressive power lens (ADDc ( Sh) -ADDc (Sl)) / (Sh-Sl), wearing addition ADD (Sl) of the first progressive addition lens, and wearing addition ADD (Sh) of the second progressive addition lens are shown.

The progressive-power lens series according to Example 14 has five progressive-power lenses with a distance power of 5.00, 4.00, 3.00, 2.00, and 1.00. The value shown in each column of the top row (1) of Example 14 is that the lens with a distance power of 5.00 is the second progressive addition lens (Sh = 5.00) and the power of distance is 4.00. The relationship between the two progressive-power lenses when the lens is the first progressive-power lens (Sl = 4.00) is shown.

Although not shown in Table 2, the progressive-power lens series according to Example 14 has a refractive index n of 1.67, an astigmatism power C of 0.00, and a distance reference point on the reference surface M1. The surface average refractive power at OF is PFb 6.27, prescription addition add 2.00, and surface addition ADDb at the reference plane is 2.50.

The values shown in the respective columns of the second row (2) from the top of Example 14 indicate that the lens having the distance power of 4.00 is the second progressive power lens (Sh = 4.00), and the distance power is The relationship between the two progressive-power lenses when the 3.00 lens is the first progressive-power lens (Sl = 3.00) is shown.

The value shown in each column of the third row (3) from the top of Example 14 is that the lens with a distance power of 3.00 is the second progressive addition lens (Sh = 3.00), and the distance power is The relationship between the two progressive-power lenses when the lens of 2.00 is the first progressive-power lens (Sl = 2.00) is shown.

The values shown in the columns of the bottom row (4) of Example 14 are as follows. A lens with a distance power of 2.00 is a second progressive power lens (Sh = 2.00), and a distance power is 1.00. The relationship between the two progressive-power lenses when the lens is the first progressive-power lens (Sl = 1.00) is shown.

In the progressive-power lens series of Example 14, the surface average refractive power PFb at the distance reference point of the reference surface was set to the same value as 6.27. Also, the astigmatic power specified by the prescription value is 0.00, the addition power specified by the prescription value is 2.00, and the surface addition power at the reference plane is 2.50, which is the same value among the five lenses. did.

Regarding the addition power on the correction surface, -0.83 for a progressive power lens with a distance power of 5.00, -0.74 for a progressive power lens with a distance power of 4.00, and a distance power Is -0.67 for a progressive power lens with a 3.00, -0.63 for a progressive power lens with a distance power of 2.00, and-for a progressive power lens with a distance power of 1.00- It was 0.60.

As a result, the distance between the surface addition on the correction surface of the second progressive-power lens and the surface addition on the correction surface of the first progressive-power lens is the distance specified by the prescription value for the second progressive-power lens. The value (ADDc (Sh) −ADDc (Sl)) / (Sh−Sl) divided by the difference between the power Sh and the distance power S1 designated by the prescription value for the first progressive-power lens is the above (1 ) In the case of (2), -0.07 in the case of (2), -0.04 in the case of (3), and in the case of (4) above. -0.03.

At this time, all the values of the wearing addition ADD in the lenses of the respective dioptric powers were equal to the prescription addition add, and the object of the present invention could be achieved.

(Example 15)
Next, Example 15 will be described with reference to Table 3.

Table 3 is the same as Table 2 above, but the distance power S1 specified by the prescription value for the first progressive-power lens, the surface addition ADDc (Sl) on the correction surface, and the prescription value for the second progressive-power lens Distance addition power Sh specified by the above, surface addition ADDc (Sh) on the correction surface, surface addition ADDc (Sh) on the correction surface of the second progressive power lens and surface addition on the correction surface of the first progressive power lens The difference from the power ADDc (Sl) is the difference between the distance power Sh specified by the prescription value for the second progressive power lens and the distance power Sl specified by the prescription value for the first progressive power lens. Divided value (ADDc (Sh) -ADDc (Sl)) / (Sh-Sl), wearing addition ADD (Sl) of the first progressive addition lens, wearing addition ADD (Sh) of the second progressive addition lens Shows each .

The progressive-power lens series according to Example 15 has five progressive-power lenses having a distance power of 4.00, 3.00, 2.00, 1.00, and 0.00. The values shown in each column of the top row (1) of Example 15 are such that a lens with a distance power of 4.00 is a second progressive power lens (Sh = 4.00), and a distance power is 3.00. The relationship between the two progressive-power lenses when the lens is a first progressive-power lens (Sl = 3.00) is shown.

Although not shown in Table 3, the progressive-power lens series according to Example 15 has a refractive index n of 1.67, and has a surface average refractive power of the reference surface M1 at the distance reference point OF1. The PFb is 4.39, the astigmatic power C specified in the prescription is 0.00, the prescription addition add is 3.50, and the surface addition ADDb on the reference plane is 4.00.

The values shown in the respective columns of the second row (2) from the top of Example 15 indicate that the lens with a distance power of 3.00 is the second progressive addition lens (Sh = 3.00), and the power of distance is The relationship between the two progressive-power lenses when the lens of 2.00 is the first progressive-power lens (Sl = 2.00) is shown.

The values shown in the columns of the third row (3) from the top of Example 15 are such that the lens with a distance power of 2.00 is the second progressive addition lens (Sh = 2.00), and the power of distance is The relationship between the two progressive-power lenses when the lens of 1.00 is the first progressive-power lens (Sl = 1.00) is shown.

The values shown in each column of the bottom row (4) of Example 15 are such that a lens with a distance power of 1.00 is a second progressive power lens (Sh = 1.00), and a distance power is 0.00. The relationship between the two progressive-power lenses when the lens is a first progressive-power lens (Sl = 0.00) is shown.

In the progressive-power lens series of Example 15, the surface average refractive power PFb at the distance reference point of the reference surface was set to the same value as 4.39. In addition, the astigmatic power specified by the prescription value is 0.00, the addition power specified by the prescription value is 3.50, and the surface addition power at the reference plane is 4.00, which is the same value among the five lenses. did.

As for the surface addition on the correction surface, -1.07 for a progressive power lens with a distance power of 4.00, -0.96 for a progressive power lens with a distance power of 3.00, and a distance power Is -0.88 for progressive-power lenses with a power of 2.00, -0.82 for progressive-power lenses with a distance power of 1.00, and-for progressive-power lenses with a distance power of 0.00- It was set to 0.78.

As a result, the distance between the surface addition on the correction surface of the second progressive-power lens and the surface addition on the correction surface of the first progressive-power lens is the distance specified by the prescription value for the second progressive-power lens. The value (ADDc (Sh) −ADDc (Sl)) / (Sh−Sl) divided by the difference between the power Sh and the distance power S1 designated by the prescription value for the first progressive-power lens is the above (1 ) In the case of (2), -0.08 in the case of (2), -0.07 in the case of (3), and in the case of (4) above. -0.04.

(Example 16)
Next, Example 16 will be described with reference to Table 4.

Table 4 is the same as Table 2 and Table 3 above, regarding the distance diopter S1 specified by the prescription value for the first progressive addition lens, the surface addition ADDc (S1) on the correction surface, and the second progressive addition lens. The distance dioptric power Sh specified by the prescription value, the surface addition ADDc (Sh) on the correction surface, the surface addition ADDc (Sh) on the correction surface of the second progressive addition lens, and the correction surface of the first progressive addition lens The difference between the surface addition power ADDc (Sl) at the distance and the distance power Sh designated by the prescription value for the second progressive power lens and the distance power Sl designated by the prescription value for the first progressive power lens (ADDc (Sh) −ADDc (Sl)) / (Sh−Sl) divided by the difference between the first progressive addition lens ADD (Sl) and second addition ADD lens addition ADD (Sh) It is.

The progressive addition lens series according to Example 16 has a distance power of 0.00, -1.00, -2.00, -3.00, -4.00, -5.00, -6.00, It has 10 progressive power lenses of −7.00, −8.00, and −9.00.

Although not shown in Table 4, the progressive-power lens series according to Example 16 has a refractive index n of 1.67, and a surface average refractive power at the distance reference point OF1 of the reference surface M1. PFb is 2.51, astigmatism power C specified by prescription is 0.00, prescription addition add is 0.75, and surface addition ADDb at the reference plane is 1.50.

The value shown in each column of the top row (1) of Example 16 is that the lens with a distance power of 0.00 is the second progressive power lens (Sh = 0.00), and the power of distance is -1.00. The relationship between the two progressive-power lenses when the first lens is the first progressive-power lens (Sl = −1.00) is shown.

The values shown in the columns of the second row (2) from the top of Example 16 are as follows: a lens with a distance power of -1.00 is a second progressive power lens (Sh = -1.00) This shows the relationship between two progressive-power lenses when a lens with a power of -2.00 is a first progressive-power lens (Sl = -2.00).

The values shown in the columns of the third row (3) from the top of Example 16 are as follows: a lens with a distance power of -2.00 is a second progressive power lens (Sh = -2.00) The relationship between the two progressive-power lenses when the lens having a power of −3.00 is used as the first progressive-power lens (Sl = −3.00) is shown.

The values shown in the columns of the fourth row (4) from the top of Example 16 are as follows: a lens with a distance power of −3.00 is the second progressive addition lens (Sh = −3.00), The relationship between the two progressive-power lenses when the lens having a power of −4.00 is used as the first progressive-power lens (Sl = −4.00) is shown.

The values shown in the respective columns of the fifth row (5) from the top of Example 16 indicate that the lens with the distance power of −4.00 is the second progressive addition lens (Sh = −4.00), and the distance The relationship between the two progressive-power lenses when the lens having a power of −5.00 is used as the first progressive-power lens (Sl = −5.00) is shown.

The values shown in the respective columns of the sixth row (6) from the top of Example 16 indicate that the lens with a distance power of −5.00 is the second progressive addition lens (Sh = −5.00), and the distance is The relationship between the two progressive-power lenses when the lens having a power of −6.00 is used as the first progressive-power lens (Sl = −6.00) is shown.

The values shown in the respective columns of the seventh row (7) from the top of Example 16 indicate that the lens with the distance power of −6.00 is the second progressive addition lens (Sh = −6.00), and the distance The relationship between the two progressive-power lenses when the lens having the power of −7.00 is used as the first progressive-power lens (S1 = −7.00) is shown.

The values shown in the respective columns of the eighth row (8) from the top of Example 16 indicate that the lens with the distance power of −7.00 is the second progressive addition lens (Sh = −7.00), and the distance The relationship between the two progressive-power lenses when the lens having the power of −8.00 is used as the first progressive-power lens (Sl = −8.00) is shown.

The values shown in the respective columns of the bottom line (9) of Example 16 indicate that the lens with a distance power of −8.00 is the second progressive addition lens (Sh = −8.00), and the distance power is −9. The relationship between the two progressive-power lenses when the lens of .00 is the first progressive-power lens (Sl = −9.00) is shown.

Regarding the addition power on the correction surface, -0.86 for a progressive power lens with a distance power of 0.00, -0.84 for a progressive power lens with a distance power of -1.00, -0.84 for a progressive power lens with a power of -2.00, -0.86 for a progressive power lens with a power of -3.00, and a progressive power of -4.00 for a distance power -0.89 for lenses, -0.94 for progressive-power lenses with a distance power of -5.00, -1.00 for progressive-power lenses with a distance power of -6.00, distance use -1.08 for a progressive power lens with a power of -7.00, -1.17 for a progressive power lens with a power of -8.00, and a progressive power of -9.00 for a distance power The lens was set to -1.28.

As a result, the distance between the surface addition on the correction surface of the second progressive-power lens and the surface addition on the correction surface of the first progressive-power lens is the distance specified by the prescription value for the second progressive-power lens. The value (ADDc (Sh) −ADDc (Sl)) / (Sh−Sl) divided by the difference between the power Sh and the distance power S1 designated by the prescription value for the first progressive-power lens is the above (1 ) In the case of (2) above, 0.02 in the case of (3) above, 0.02 in the case of (4) above. 03, 0.05 in the case of (5), 0.06 in the case of (6), 0.08 in the case of (7), and (8) In the case of (9), it was 0.09, and in the case of (9), it was 0.11.

Further, in this embodiment, the distance power Sp when the surface addition ADDc (S) of the correction surface M2 takes the maximum value was −1.00 and −2.00. In this case, the maximum value ADDc (Sp) of the addition of the correction surface M2 was −0.84. At this time, the difference (PFb−Sp) between the surface average refractive power of the reference surface M1 at the distance reference point OF1 and PFb and the distance power Sp was 3.51 and 4.51.

(Example 17)
Next, Example 17 will be described with reference to Table 5.

Table 5 shows the distance power S1 specified by the prescription value for the first progressive-power lens, the surface addition ADDc (Sl) on the correction surface, and the second progressive-power lens, as in Tables 2 to 4 above. The distance dioptric power Sh specified by the prescription value, the surface addition ADDc (Sh) on the correction surface, the surface addition ADDc (Sh) on the correction surface of the second progressive addition lens, and the correction surface of the first progressive addition lens The difference between the surface addition power ADDc (Sl) at the distance and the distance power Sh designated by the prescription value for the second progressive power lens and the distance power Sl designated by the prescription value for the first progressive power lens (ADDc (Sh) −ADDc (Sl)) / (Sh−Sl) divided by the difference between the first progressive addition lens ADD (Sl) and second addition ADD lens addition ADD (Sh) respectively To have. The progressive-power lens series according to Example 17 has a distance power of -2.00, -3.00, -4.00, -5.00, -6.00, -7.00, and -8.00. , -9.00, -10.00, 9 progressive power lenses.

Although not shown in Table 5, the progressive-power lens series according to Example 17 has a refractive index n of 1.67, and has a surface average refractive power of the reference surface M1 at the distance reference point OF1. PFb is 1.25, prescription-specified astigmatism power C is 0.00, prescription addition power add is 2.00, and surface addition power ADDb at the reference plane is 2.50.

The values shown in each column of the top row (1) of Example 17 are such that a lens with a distance power of -2.00 is a second progressive power lens (Sh = -2.00) and a distance power is -3. The relationship between the two progressive-power lenses when the lens of .00 is the first progressive-power lens (Sl = −3.00) is shown.

The values shown in the respective columns of the second row (2) from the top of Example 17 indicate that the lens with the distance power of −3.00 is the second progressive addition lens (Sh = −3.00), and the distance The relationship between the two progressive-power lenses when the lens having a power of −4.00 is used as the first progressive-power lens (Sl = −4.00) is shown.

The values shown in the respective columns of the third row (3) from the top of Example 17 indicate that the lens having the distance power of −4.00 is the second progressive addition lens (Sh = −4.00), and the distance The relationship between the two progressive-power lenses when the lens having a power of −5.00 is used as the first progressive-power lens (Sl = −5.00) is shown.

The values shown in the columns of the fourth row (4) from the top in Example 17 are as follows: a lens with a distance power of -5.00 is a second progressive addition lens (Sh = -5.00), The relationship between the two progressive-power lenses when the lens having a power of −6.00 is used as the first progressive-power lens (Sl = −6.00) is shown.

The values shown in the columns of the fifth row (5) from the top of Example 17 are as follows: a lens with a distance power of −6.00 is the second progressive addition lens (Sh = −6.00) The relationship between the two progressive-power lenses when the lens having the power of −7.00 is used as the first progressive-power lens (S1 = −7.00) is shown.

The values shown in the respective columns of the sixth row (6) from the top of Example 17 indicate that the lens having the distance power of −7.00 is the second progressive addition lens (Sh = −7.00), and the distance The relationship between the two progressive-power lenses when the lens having the power of −8.00 is used as the first progressive-power lens (Sl = −8.00) is shown.

The values shown in the respective columns of the seventh row (7) from the top of Example 17 indicate that the lens with the distance power of −8.00 is the second progressive addition lens (Sh = −8.00), and the distance The relationship between the two progressive-power lenses when the lens having the power of −9.00 is used as the first progressive-power lens (Sl = −9.00) is shown.

The values shown in each column of the bottom row (8) of Example 17 are such that a lens with a distance power of −9.00 is the second progressive addition lens (Sh = −9.00), and the power of distance is −10. The relationship between the two progressive-power lenses when the lens of .00 is used as the first progressive-power lens (Sl = -10.00) is shown.

Regarding the addition power on the correction surface, -0.70 for a progressive power lens with a distance power of -2.00, -0.69 for a progressive power lens with a distance power of -3.00, and far -0.70 for a progressive power lens with a power of -4.00, -0.73 for a progressive power lens with a power of -5.00, and progressive power of -6.00 for a distance power -0.77 for a power lens, -0.82 for a progressive power lens with a distance power of -7.00, -0.90 for a progressive power lens with a distance power of -8.00, It was set to -0.98 for a progressive power lens with a power of -9.00, and -1.08 for a progressive power lens with a distance power of -10.00.

As a result, the distance between the surface addition on the correction surface of the second progressive-power lens and the surface addition on the correction surface of the first progressive-power lens is the distance specified by the prescription value for the second progressive-power lens. The value (ADDc (Sh) −ADDc (Sl)) / (Sh−Sl) divided by the difference between the power Sh and the distance power S1 designated by the prescription value for the first progressive-power lens is the above (1 ) In the case of (2) above, 0.01 in the case of (3) above, 0.03 in the case of (4) above. 04, 0.06 in the case of (5), 0.07 in the case of (6), 0.09 in the case of (7), and (8) In this case, it was 0.10.

In this example, the distance dioptric power Sp when the surface addition ADDc (S) of the correction surface M2 takes the maximum value was −3.00. In this case, the maximum value ADDc (Sp) of the addition of the correction surface M2 was −0.69. At this time, the difference (PFb−Sp) between the surface average refractive power of the reference surface M1 at the distance reference point OF1 and the distance power Sp (PFb−Sp) was 4.25.

LS ... Progressive power lens F ... Distance part N ... Near part P ... Progressive part M1 ... Lens surface (outer surface, reference surface) M2 ... Lens surface (inner surface, correction surface)

Claims

An outer surface that becomes a refractive surface on the object side in the wearing state;
An inner surface that is a refractive surface on the eyeball side when worn,
At least one of the outer surface and the inner surface is
A distance portion that is provided at a position above the lens in a worn state and is relatively suitable for far vision,
A near-use portion that is provided at a lower position of the lens in a wearing state and is relatively suitable for near vision,
A progressive portion that is provided between the distance portion and the near portion, and whose surface refractive power gradually changes between the distance portion and the near portion,
One of the outer surface and the inner surface is a reference surface having a predetermined surface shape, the other is a correction surface, the distance power specified by the prescription value is S, the astigmatism power specified by the prescription value is C, the prescription value In the case where add is designated as add,
A surface addition power of the reference surface, which is a difference between the surface average refractive power at the near reference point of the reference surface and the surface average refractive power at the distance reference point of the reference surface, is defined as ADDb (S, C, add), and the addition of the correction surface to the correction surface, which is the difference between the surface average refractive power at the near reference point of the correction surface and the surface average refractive power at the distance reference point of the correction surface If the degree is ADDc (S, C, add),

A progressive-power lens that satisfies the following conditional expression:
The progressive-power lens according to claim 1, wherein the following conditional expression is satisfied.
The surface average refractive power of the reference surface at the distance reference point is PFb (S, C, add),
When the surface average refractive power at the distance reference point of the correction surface is PFc (S, C, add),
When S ≧ 0,

Is satisfied,
When S <0,

The progressive-power lens according to claim 1, wherein the following conditional expression is satisfied.
When S> 0

As well as
When S <0,

The progressive-power lens according to claim 3, wherein:
A progressive-power lens series comprising a plurality of progressive-power lenses according to any one of claims 1 to 4,
The plurality of progressive-power lenses are formed so that the surface addition of each reference surface has a constant value, and the surface addition of each of the correction surfaces is a variable. Power lens series.
A progressive-power lens series comprising a plurality of progressive-power lenses according to claim 3 or 4,
In the plurality of progressive-power lenses, the surface average refractive power at the distance reference point of each reference surface is a constant value, and the surface average power at the distance reference point of each correction surface is a variable. A progressive-power lens series characterized by
A progressive power lens included in a progressive power lens series corresponding to a plurality of different prescriptions,
An outer surface that becomes a refractive surface on the object side in the wearing state;
An inner surface that becomes a refractive surface on the eyeball side in a wearing state,
At least one of the outer surface and the inner surface is
A distance portion that is provided at a position above the lens in a worn state and is relatively suitable for far vision,
A near-use portion that is provided at a lower position of the lens in a wearing state and is relatively suitable for near vision,
A progressive portion that is provided between the distance portion and the near portion, and in which surface refractive power between the distance portion and the near portion changes progressively,
One of the outer surface and the inner surface is a reference surface having a predetermined surface shape, the other is a correction surface,
The distance power specified by the prescription value is S, and when the distance power is S, the astigmatism power specified by the prescription value is C (S), and the addition power specified by the prescription value is add (S). The surface addition power of the reference surface, which is the difference between the surface average refractive power at the near reference point of the reference surface and the surface average refractive power at the distance reference point of the reference surface, is ADDb (S), the correction The addition power of the correction surface, which is the difference between the surface average power at the near reference point of the surface and the surface average power at the distance reference point of the correction surface, is ADDc (S), and the progressive power In a progressive addition lens having the same astigmatism power C (S), the addition power add (S), and the surface surface addition power ADDb (S) included in the lens series, the surface addition power of the correction surface Sp is the distance power when ADDc (S) takes the maximum value,
In the progressive power lens series, the first progressive power lens in which the distance power is the first distance power S1 and the second distance power in which the distance power is greater than the first distance power S1. When the second progressive-power lens having the power Sh is selected,
Each of the astigmatism power C (Sl), the addition add (Sl), the surface addition ADDb (Sl) of the reference surface, and the surface addition ADDc (Sl) of the correction surface in the first progressive-power lens, ,
The astigmatic power C (Sh), the addition power add (Sh), the surface addition power ADDb (Sh) of the reference surface, and the surface addition power ADDc (Sh) of the correction surface in the second progressive-power lens, respectively about,
C (Sh) = C (Sl),
add (Sh) = add (Sl),
ADDb (Sh) = ADDb (Sl)
When
When Sp ≦ Sl,

Is satisfied,
When Sp ≧ Sh,

A progressive-power lens that satisfies the following conditional expression:
When Sp ≦ Sl,

Is satisfied,
When Sp ≧ Sh,

The progressive-power lens according to claim 7, wherein the following conditional expression is satisfied.
When the surface average refractive power at the distance reference point of the reference surface is PFb,

The progressive-power lens according to claim 7 or 8, wherein the following conditional expression is satisfied.
A progressive power lens included in a progressive power lens series corresponding to a plurality of different prescriptions,
An outer surface that becomes a refractive surface on the object side in the wearing state;
An inner surface that becomes a refractive surface on the eyeball side in a wearing state,
At least one of the outer surface and the inner surface is
A distance portion that is provided at a position above the lens in a worn state and is relatively suitable for far vision,
A near-use portion that is provided at a lower position of the lens in a wearing state and is relatively suitable for near vision,
A progressive portion that is provided between the distance portion and the near portion, and in which surface refractive power between the distance portion and the near portion changes progressively,
One of the outer surface and the inner surface is a reference surface having a predetermined surface shape, the other is a correction surface,
The distance power specified by the prescription value is S, and when the distance power is S, the astigmatism power specified by the prescription value is C (S), and the addition power specified by the prescription value is add (S). The surface addition power of the reference surface, which is the difference between the surface average refractive power at the near reference point of the reference surface and the surface average refractive power at the distance reference point of the reference surface, is ADDb (S), the correction The addition power of the correction surface, which is the difference between the surface average power at the near reference point of the surface and the surface average power at the distance reference point of the correction surface, is ADDc (S),
In the progressive power lens series, the first progressive power lens in which the distance power is the first distance power S1 and the second distance power in which the distance power is greater than the first distance power S1. When the second progressive-power lens having the power Sh is selected,
Each of the astigmatism power C (Sl), the addition add (Sl), the surface addition ADDb (Sl) of the reference surface, and the surface addition ADDc (Sl) of the correction surface in the first progressive-power lens, ,
The astigmatic power C (Sh), the addition power add (Sh), the surface addition power ADDb (Sh) of the reference surface, and the surface addition power ADDc (Sh) of the correction surface in the second progressive-power lens, respectively about,
C (Sh) = C (Sl),
add (Sh) = add (Sl),
ADDb (Sh) = ADDb (Sl),
And
0 ≦ Sl
When

A progressive-power lens that satisfies the following conditional expression:
The progressive-power lens according to claim 10, wherein the following conditional expression is satisfied.
The progressive power according to any one of claims 7 to 11, wherein the reference surface shape is the same between the first progressive-power lens and the second progressive-power lens. lens.
The progressive refraction according to any one of claims 7 to 13, wherein each of the first progressive-power lens and the second progressive-power lens has the outer surface as the reference surface. Power lens.