JP2008249828A - Eyeglass lens and design method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a design method of an eyeglass lens that is thin in edge thickness, giving consideration to wearer's property regarding the eyeglass lens using situation. <P>SOLUTION: Regarding the design method of the eyeglass lens of the present invention, the curvature radius on the object side of the eyeglass lens and the curvature radius on the eyeball side of the eyeglass lens are set based on prescription data of the eyeglass wearer. A first area showing the high using-frequency of the eyeglass wearer and a second area showing the low using-frequency of the eyeglass wearer are defined on at least one surface of the eyeglass lens based on the angle of torsion in the eyeball of the eyeglass wearer. The curvature radius in the second area is continuously changed and modified as it comes close to a peripheral part, that is, in a direction where the edge thickness of the lens becomes thinner, related to the curvature radius set based on the prescription data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a spectacle lens and a design method thereof. In particular, the present invention relates to a spectacle lens having a thin edge thickness and a design method thereof.

  In the case of a spectacle lens having a large refractive power, the lens edge thickness increases, and the lens becomes heavier and worse in appearance. In addition, frames that can be used for the spectacle lens are also limited. Recently, since the appearance of spectacles has been emphasized, it is very important to improve the appearance of the lens and widen the selection range of the frame.

  2. Description of the Related Art Conventionally, a spectacle lens having an optically effective portion provided at the center of a spectacle lens and adjusting the lens shape at a peripheral portion outside the spectacle lens has been developed (for example, Patent Document 1).

  However, the usage of spectacle lenses varies depending on the characteristics of the wearer. Therefore, when designing a spectacle lens with a thin edge thickness, the characteristics of the wearer regarding the use situation of the spectacle lens should be taken into consideration.

JP 2000-47144 A

  However, a design method for a spectacle lens having a thin edge thickness, and a design method that takes into consideration the characteristics of the wearer regarding the use state of the spectacle lens has not been developed. In addition, a spectacle lens with a thin edge thickness has not been developed in consideration of the wearer's characteristics relating to the usage status of the spectacle lens.

  Therefore, a need for a spectacle lens having a thin edge thickness that takes into consideration the wearer's characteristics relating to the use situation of the spectacle lens and a thin spectacle lens design method and a wearer's characteristic relating to the use situation of the spectacle lens. There is.

  According to the spectacle lens design method of the present invention, based on prescription data of a spectacle wearer, a curvature radius on the object side and a curvature radius on the eyeball side of the spectacle lens are determined, and the spectacle wear on at least one surface of the spectacle lens is determined. A first region where the wearer's usage frequency is high and a second region where the spectacle wearer's usage frequency is low are determined based on the rotation angle of the eyeball of the spectacle wearer. In this design method, the radius of curvature in the second region is corrected by continuously changing the radius of curvature of the lens in the direction in which the edge thickness of the lens becomes thinner with respect to the radius of curvature determined based on the prescription data. It is characterized by that.

  According to the present invention, there is provided a spectacle lens design method with a small edge thickness in which the first and second regions are determined for each spectacle wearer, and the characteristics of the spectacle wearer regarding the use status of the spectacle lens are taken into consideration. can get.

In the spectacle lens according to the present invention, at least one surface of the spectacle lens is based on the rotation angle of the eyeball of the spectacle wearer. It is divided into areas. In the spectacle lens according to the present invention, the radius of curvature in the first region is determined based on prescription data of the spectacle wearer, and the radius of curvature in the second region is a radius of curvature determined based on the prescription data. On the other hand, according to the present invention, the correction is performed by continuously changing the lens edge thickness toward the peripheral portion in the direction of decreasing the edge thickness. And the second region where the spectacle lens usage frequency by the spectacle wearer is low is divided to determine the shape of the spectacle lens, thereby taking into account the spectacle wearer's characteristics regarding the spectacle lens usage situation. A thin spectacle lens can be obtained.

  According to an embodiment of the present invention, the upper limit value of the rotation angle of the first region is in the range of 20 degrees to 30 degrees.

  According to the present embodiment, the upper limit value of the rotation angle of the first region is determined in the range of 20 degrees to 30 degrees for each spectacle wearer, so that the characteristics of the spectacle wearer regarding the use situation of the spectacle lens are taken into consideration. Thus, a spectacle lens design method or spectacle lens having a thin edge thickness can be obtained.

  According to another embodiment of the present invention, the upper limit value of the rotation angle of the first region is determined based on the visual pattern value of the spectacle wearer.

  According to the present embodiment, the upper limit value of the rotation angle of the first region can be appropriately determined by using the visual pattern value of the spectacle wearer.

  According to another embodiment of the present invention, the upper limit value of the rotation angle of the second region is in the range of 40 degrees to 60 degrees.

  According to the present embodiment, the upper limit value of the rotation angle of the second region is determined in the range of 40 degrees to 60 degrees for each spectacle wearer, thereby taking into account the spectacle wearer's characteristics regarding the use situation of the spectacle lens. Thus, a spectacle lens design method or spectacle lens having a thin edge thickness can be obtained.

  According to another embodiment of the present invention, the upper limit value of the rotation angle of the second region is determined based on the visual pattern value of the spectacle wearer.

  According to the present embodiment, the upper limit value of the rotation angle of the second region can be appropriately determined by using the spectacle value of the spectacle wearer.

  According to another embodiment of the present invention, the shape of the curve is modified so that the curve has an inflection point in the third region where the rotation angle is larger than the upper limit value of the rotation angle of the second region. It is characterized by doing.

  According to the present embodiment, in the third region that is not used by the spectacle wearer, the shape of the curve is modified so that the curve has an inflection point, so that the spectacle wearer can see it. The edge thickness of the spectacle lens can be reduced without influencing.

とし、

における眼側の屈折面を表す曲線のＹ軸方向の修正量を

とし、

を定数とした場合に、

であることを特徴とする。 According to another embodiment of the present invention, in a predetermined cross section including a straight line connecting the center of rotation of the eyeball and the optical center of the spectacle lens, a point where the straight line intersects the at least one surface is used as a reference point. A tangent line at the reference point of the at least one surface is set as a reference line, an XY orthogonal coordinate having the reference point as an origin and the reference line as an X axis is defined, and an X coordinate of an arbitrary point in the second region is defined as

age,

The correction amount in the Y-axis direction of the curve representing the refractive surface on the eye side in

age,

Is a constant,

It is characterized by being.

  According to the present embodiment, the radius of curvature of the curve in the second region is closer to the peripheral portion than a value determined so as to realize the refractive power of the lens determined based on the prescription data of the spectacle wearer. It can be modified to gradually increase.

  According to the present invention, the edge thickness is thin in consideration of the wearer's characteristics regarding the use situation of the spectacle lens, and the edge thickness is thin in consideration of the wearer's characteristics regarding the spectacle lens design method and the use situation of the spectacle lens. A spectacle lens is obtained.

  FIG. 1 is a flowchart illustrating a spectacle lens design method according to an embodiment of the present invention.

  In step S1010 of FIG. 1, prescription data for the spectacle wearer is obtained. The prescription data of the spectacle wearer includes lens prescription data such as spherical power, astigmatism power, astigmatism axis, addition power, prism amount, frame shape, pupil distance, and eye point. Next, the shape of the object-side refractive surface and the shape of the eye-side refractive surface of the spectacle lens are determined so as to realize the refractive power of the lens determined based on the prescription data of the spectacle wearer.

  In step S1020 of FIG. 1, a first region and a second region are defined on the eye-side refractive surface for each spectacle wearer. The first region is a region where the rotation angle is equal to or less than the first predetermined value and the frequency of use of the spectacle lens by the wearer is high. The second region is a region where the rotation angle is larger than the first predetermined value and equal to or smaller than the second predetermined value, and the frequency of use of the spectacle lens by the wearer is low. The region where the rotation angle is larger than the second predetermined value is a region where the wearer does not use the spectacle lens, and is referred to as a third region. Here, the rotation angle is an angle at which the eyeball is rotated from the front-rear axis.

  The first and second regions vary depending on the characteristics of the spectacle wearer. Therefore, the visual print value may be used to represent the characteristics of the spectacle wearer. The visual print value will be described below.

  FIG. 2 is a diagram for explaining the visual print value. The direction of the front of the spectacle wearer is indicated by a one-dot chain line. When the observation object is at a position deviating from the front direction at the beginning of the spectacle wearer, the spectacle wearer rotates the eyeball, the entire face (head), or both. As shown in FIG. 2, the angle of the object based on the initial front direction is referred to as a target angle. In addition, the head angle based on the initial front direction is referred to as a head angle. Here, the ratio of the head angle to the target angle is defined as the visual print value. Empirically, the visual print value is almost constant by the spectacle wearer. Accordingly, the eyeprint value of the spectacle wearer is measured by measuring the movement of the entire face and the movement of the eyeball of the spectacle wearer. The difference between the target angle and the head angle is the rotation angle of the eyeball. Therefore, a spectacle wearer with a large visual print value falls within a range in which the eyeball rotation angle is small, whereas a spectacle wearer with a small visual print value has a large eyeball rotation angle.

  For a spectacle wearer whose visual print value is 0 (that is, the head is not rotated), the upper limit angle of rotation of the first area is set to 30 degrees or more, and the upper limit angle of rotation of the second area is set to It is preferable to set it to 50 degrees or more.

  On the other hand, the upper limit rotation angle of the first and second regions can be reduced for a spectacle wearer whose visual print value is a certain value or more. For example, a spectacle wearer whose visual print value is equal to or greater than a predetermined value 0.8 has a small rotation angle of the eyeball. Therefore, the upper rotation angle of the first region is set to 20 degrees, and the upper rotation angle of the second region is set. The angle may be 40 degrees.

  In general, it is preferable that the upper limit rotation angle of the first region is selected from a value in the range of 20 degrees to 30 degrees according to the visual print value for the spectacle wearer. The upper limit rotation angle of the first region may be determined by corresponding the visual pattern value from the predetermined value to 0 to 20 degrees to 40 degrees. Further, it is preferable that the upper limit rotation angle of the second region is selected from a value in the range of 40 degrees to 60 degrees in accordance with the visual print value for the spectacle wearer. The upper limit rotation angle of the second area may be determined by correlating the predetermined value of the visual pattern value from 0 to 40 degrees to 60 degrees. The higher the eyeprint value of the spectacle wearer, the narrower the upper rotation angle of the first or second region. In this way, the upper rotation angle of the first and second regions can be determined in correspondence with the visual print value.

  In step S1030 of FIG. 1, in the second region, the shape of the refractive surface on the eye side is corrected under a predetermined condition. Hereinafter, a method for correcting the shape of the refractive surface on the eye side will be described using the spectacle lens according to the first embodiment of the present invention as an example. In the following examples, the lens is designed based on a single refractive power. The refractive index of the lens is 1.67.

  FIG. 3 is a cross-sectional view of the spectacle lens according to the first embodiment of the present invention, including a straight line connecting the rotation center point C2 of the eyeball and the optical center C1 of the spectacle lens. In FIG. 3, the outer side (ear side) of the spectacle lens is indicated by “Out”, and the inner side (nose side) is indicated by “In”. The central power of the spectacle lens according to this example is −4 diopters, and the distance from the optical center to the outer (ear side) end is 29 millimeters. Further, the center thickness of the spectacle lens according to the present embodiment is 1.1 millimeters. A point where the straight line intersects the refractive surface on the eye side is a reference point O, a tangent line at the reference point O of a curve representing the refractive surface on the eye side is a reference line, the reference point O is an origin, and the reference line is an X axis. Define XY Cartesian coordinates. In this embodiment, the first region is a region with a rotation angle of 30 degrees or less, the second region is a region with a rotation angle greater than 30 degrees and less than 50 degrees, and the third region is a rotation angle of 50 degrees. Larger area. In FIG. 3, the lens shape that realizes the refractive power of the lens determined based on the prescription data of the spectacle wearer is indicated by a dotted line, and the lens shape according to the present embodiment is indicated by a solid line. Hereinafter, a lens having a lens shape that realizes the refractive power of the lens determined based on prescription data of the spectacle wearer is referred to as a comparative example.

  In the first region, the lens shape indicated by the dotted line is not corrected. In other words, the curvature in the first region of the curve representing the refractive surface on the eye side of the spectacle lens according to the present embodiment is a curvature that realizes the refractive power of the lens determined based on the prescription data of the spectacle wearer.

  In the second region, the lens shape indicated by the dotted line is corrected so as to reduce the edge thickness. Specifically, in the first and second regions, the curve representing the eye-side refracting surface in the second region is made while there is no inflection point other than the apex in the curve representing the eye-side refracting surface. The curvature radius is set to be larger than the curvature radius that realizes the refractive power of the lens determined based on the prescription data of the spectacle wearer. Preferably, in the second region, the difference between the curvature radius of the curve representing the refractive surface on the eye side and the curvature radius realizing the refractive power of the lens determined based on the prescription data of the spectacle wearer is from the optical center. Increase gradually toward the periphery.

とし、第２の領域の任意の点のＸ座標を

とし、

における眼側の屈折面を表す曲線のＹ軸方向の修正量を

とし、

を定数とした場合に、

としてもよい。ここで、５次の多項式を使用したが、その他の次数の多項式であってもよい。その場合に、第２および第３の領域の境界のＸ座標を

とした場合に、当該境界における修正量は、

の範囲であるのが好ましい。 More specifically, the X coordinate of the boundary between the first and second regions is

And the X coordinate of an arbitrary point in the second area

age,

The correction amount in the Y-axis direction of the curve representing the refractive surface on the eye side in

age,

Is a constant,

It is good. Here, a fifth order polynomial is used, but other order polynomials may be used. In that case, the X coordinate of the boundary between the second and third regions is

The amount of correction at that boundary is

It is preferable that it is the range of these.

  In the third region, the curve representing the eye-side refractive surface may have an inflection point.

  The curves in the first, second, and third regions are connected by a higher-order polynomial or spline function to obtain a corrected curve.

  As shown in FIG. 3, the outer (edge side) edge thickness of the spectacle lens according to this example is 3.3 millimeters. Compared to the edge thickness (3.4 mm) of the lens of the comparative example, the thickness is 0.1 mm thinner.

および

の位置における曲率半径をR1,R2およびR3とすると
R1= 115.823
R2= 114.291
R3=1244.397
である。 In the first embodiment, the coordinates of the curve representing the refractive surface on the eye side are 0,

and

Let R1, R2, and R3 be the radius of curvature at the position of
R1 = 115.823
R2 = 114.291
R3 = 1244.397
It is.

  FIG. 4 is a diagram showing the power at each point of the spectacle lens according to the present embodiment as a difference from the central power. The horizontal axis in FIG. 4 indicates the difference from the central power (−4 diopters), and the vertical axis indicates the rotation angle. The solid line represents the meridional plane data (M), and the dotted line represents the sagittal plane data (S). The rotation angle of the data of the meridional surface is based on the left scale, and the data rotation angle of the sagittal surface is based on the right scale.

  In step S1040 of FIG. 1, it is determined whether the edge thickness is within an allowable range. If the edge thickness is within the allowable range, the process is terminated. If the edge thickness is not within the allowable range, the process proceeds to step S1050.

  In step S1050 of FIG. 1, the first and second regions are changed, and then the process proceeds to step S1030. By reducing the upper limit rotation angle (first predetermined value) of the first region, the second region that can correct the shape of the refractive surface on the eye side (the curvature of the curve representing the refractive surface on the eye side) is expanded. The edge thickness can be made thinner. Further, if the upper limit rotation angle (first predetermined value) of the first region is fixed and the upper limit rotation angle (second predetermined value) of the second region is decreased, the refractive surface on the eye side is represented. Since the third region where the inflection point of the curve can be determined is widened, the edge thickness can be further reduced. However, in the range where the shape of the refracting surface on the eye side is modified so as to reduce the edge thickness, the radius of curvature increases, so the refractive power of the spectacle lens decreases. Therefore, the range of the first and second regions is determined while balancing the edge thickness and the range where the refractive power decreases. For example, when the edge thickness is sufficiently thin, the first or second predetermined value may be increased so as not to decrease the refractive power of the spectacle lens.

  Here, a second embodiment in which the ranges of the first and second regions of the first embodiment are changed will be described.

  FIG. 5 is a cross-sectional view of the spectacle lens according to the second embodiment of the present invention, including a straight line connecting the rotation center point C2 of the eyeball and the optical center C1. In this embodiment, the other conditions were the same as in the first embodiment, the first predetermined value was 26 degrees, and the second predetermined value was 42 degrees. As described above, the first and second predetermined values are decreased as compared with the first embodiment. In FIG. 5, the lens shape of the comparative example is indicated by a dotted line, and the lens shape according to the present example is indicated by a solid line.

  As shown in FIG. 5, the outer (ear side) edge thickness of the spectacle lens according to the present example is 2.5 mm, and the outer (ear side) edge thickness of the first example (3.3 mm). Compared to the thickness is 0.8 millimeters thinner.

In the second embodiment,
R1 = 115.823
R2 = 115.255
R3 = 397.337
It is.

  FIG. 6 is a diagram showing the power at each point of the spectacle lens according to the present embodiment as a difference from the central power. The horizontal axis in FIG. 6 indicates the difference from the central power (−4 diopters), and the vertical axis indicates the rotation angle. The solid line represents the meridional plane data (M), and the dotted line represents the sagittal plane data (S). The rotation angle of the data of the meridional surface is based on the left scale, and the data rotation angle of the sagittal surface is based on the right scale.

  In the following, another embodiment in which the distance from the optical center to the ear end and the central power is changed will be described.

  FIG. 7 is a cross-sectional view of the spectacle lens according to the third embodiment of the present invention, including a straight line connecting the rotation center point C2 of the eyeball and the optical center C1. In FIG. 7, the outer side (ear side) of the spectacle lens is indicated by “Out”, and the inner side (nose side) is indicated by “In”. The central power of the spectacle lens according to this example is −4 diopters, and the distance from the optical center to the outer (ear side) end is 33 millimeters. Further, the center thickness of the spectacle lens according to the present embodiment is 1.1 millimeters. A point where the straight line intersects the refractive surface on the eye side is a reference point O, a tangent line at the reference point O of a curve representing the refractive surface on the eye side is a reference line, the reference point O is an origin, and the reference line is an X axis. Define XY Cartesian coordinates. In this embodiment, the first region is a region where the rotation angle is 30 degrees or less, the second region is a region where the rotation angle is greater than 30 degrees and is 50 degrees or less, and the third region is a rotation angle of 50 degrees. Larger area. In FIG. 7, the lens shape of the comparative example is indicated by a dotted line, and the lens shape according to the present example is indicated by a solid line.

  As shown in FIG. 7, the outer (ear side) edge thickness of the spectacle lens according to this example is 3.6 millimeters. Compared to the edge thickness (4.1 mm) of the comparative example, the thickness is 0.5 mm thinner. The spectacle lens according to the present example has a larger distance from the optical center to the outer (ear side) end portion and a third area compared to the spectacle lens according to the first example. Therefore, the decrease in the edge thickness is large compared to the first embodiment.

In the third embodiment,
R1 = 115.823
R2 = 114.277
R3 = 819.965
It is.

  FIG. 8 is a diagram showing the power at each point of the spectacle lens according to the present embodiment as a difference from the central power. The horizontal axis in FIG. 8 indicates the difference from the central power (−4 diopters), and the vertical axis indicates the rotation angle. The solid line represents the meridional plane data (M), and the dotted line represents the sagittal plane data (S). The rotation angle of the data of the meridional surface is based on the left scale, and the data rotation angle of the sagittal surface is based on the right scale.

  FIG. 9 is a cross-sectional view of the spectacle lens according to the fourth embodiment of the present invention, including a straight line connecting the rotation center point C2 of the eyeball and the optical center C1. In FIG. 9, the outer side (ear side) of the spectacle lens is indicated by “Out”, and the inner side (nose side) is indicated by “In”. The central power of the spectacle lens according to this example is −6 diopters, and the distance from the optical center to the outer (ear side) end is 29 mm. Further, the center thickness of the spectacle lens according to the present embodiment is 1.1 millimeters. A point where the straight line intersects the refractive surface on the eye side is a reference point O, a tangent line at the reference point O of a curve representing the refractive surface on the eye side is a reference line, the reference point O is an origin, and the reference line is an X axis. Define XY Cartesian coordinates. In this embodiment, the first region is a region where the rotation angle is 30 degrees or less, the second region is a region where the rotation angle is greater than 30 degrees and is 44 degrees or less, and the third region is a rotation angle of 44 degrees. Larger area. In FIG. 9, the lens shape of the comparative example is indicated by a dotted line, and the lens shape according to the present example is indicated by a solid line.

  As shown in FIG. 9, the edge thickness of the outer side (ear side) of the spectacle lens according to this example is 3.3 millimeters. Compared to the edge thickness (4.7 mm) of the comparative example, the thickness is 1.4 mm thinner.

In the fourth embodiment,
R1 = 98.660
R2 = 96.901
R3 = 628.077
It is.

  FIG. 10 is a diagram showing the power at each point of the spectacle lens according to the present embodiment as a difference from the central power. The horizontal axis in FIG. 10 indicates the difference from the central power (−6 diopters), and the vertical axis indicates the rotation angle. The solid line represents the meridional plane data (M), and the dotted line represents the sagittal plane data (S). The rotation angle of the data of the meridional surface is based on the left scale, and the data rotation angle of the sagittal surface is based on the right scale.

  FIG. 11 is a cross-sectional view of the spectacle lens according to the fifth embodiment of the present invention, including a straight line connecting the rotation center point C2 of the eyeball and the optical center C1. In FIG. 11, the outer side (ear side) of the spectacle lens is indicated by “Out”, and the inner side (nose side) is indicated by “In”. The central power of the spectacle lens according to this example is −6 diopters, and the distance from the optical center to the outer (ear side) end is 33 millimeters. Further, the center thickness of the spectacle lens according to the present embodiment is 1.1 millimeters. A point where the straight line intersects the refractive surface on the eye side is a reference point O, a tangent line at the reference point O of a curve representing the refractive surface on the eye side is a reference line, the reference point O is an origin, and the reference line is an X axis. Define XY Cartesian coordinates. In this embodiment, the first region is a region having a rotation angle of 30 degrees or less, the second region is a region having a rotation angle greater than 30 degrees and 47 degrees or less, and the third region is a rotation angle of 47 degrees. Larger area. In FIG. 11, the lens shape of the comparative example is indicated by a dotted line, and the lens shape according to the present example is indicated by a solid line.

  As shown in FIG. 11, the outer (ear side) edge thickness of the spectacle lens according to this example is 3.5 millimeters. Compared to the edge thickness (5.8 mm) of the comparative example, the thickness is 2.3 mm thinner. The spectacle lens according to the present example has a larger distance from the optical center to the outer (ear side) end than the spectacle lens according to the fourth example. Therefore, the decrease in the edge thickness is large compared to the fourth embodiment.

In the fifth embodiment,
R1 = 98.660
R2 = 96.930
R3 = 141.994
It is.

  FIG. 12 is a diagram showing the power at each point of the spectacle lens according to the present embodiment as a difference from the central power. The horizontal axis in FIG. 12 indicates the difference from the central power (−6 diopters), and the vertical axis indicates the rotation angle. The solid line represents the meridional plane data (M), and the dotted line represents the sagittal plane data (S). The rotation angle of the data of the meridional surface is based on the left scale, and the data rotation angle of the sagittal surface is based on the right scale.

  FIG. 13 is a cross-sectional view of the spectacle lens according to the sixth embodiment of the present invention, including a straight line connecting the rotation center point C2 of the eyeball and the optical center C1. In FIG. 13, the outer side (ear side) of the spectacle lens is indicated by “Out”, and the inner side (nose side) is indicated by “In”. The central power of the spectacle lens according to this example is −6 diopters, and the distance from the optical center to the outer (ear side) end is 29 mm. Further, the center thickness of the spectacle lens according to the present embodiment is 1.1 millimeters. A point where the straight line intersects the refractive surface on the eye side is a reference point O, a tangent line at the reference point O of a curve representing the refractive surface on the eye side is a reference line, the reference point O is an origin, and the reference line is an X axis. Define XY Cartesian coordinates. In this embodiment, the first region is a region where the rotation angle is 30 degrees or less, the second region is a region where the rotation angle is greater than 30 degrees and is 50 degrees or less, and the third region is a rotation angle of 50 degrees. Larger area. In FIG. 13, the lens shape of the comparative example is indicated by a dotted line, and the lens shape according to the present example is indicated by a solid line.

  As shown in FIG. 13, the outer (ear side) edge thickness of the spectacle lens according to this example is 4.5 millimeters. Compared to the edge thickness (4.7 mm) of the comparative example, the thickness is 0.2 mm thinner. The spectacle lens according to the present example has an upper rotation angle of the second region wider than that of the spectacle lens according to the fourth example. Therefore, the decrease in the edge thickness is small compared to the fourth embodiment.

In the sixth embodiment,
R1 = 98.660
R2 = 96.645
R3 = 1239.886
It is.

  FIG. 14 is a diagram showing the frequency at each point of the spectacle lens according to this example as a difference from the central frequency. The horizontal axis in FIG. 14 indicates the difference from the central power (−6 diopters), and the vertical axis indicates the rotation angle. The solid line represents the meridional plane data (M), and the dotted line represents the sagittal plane data (S). The rotation angle of the data of the meridional surface is based on the left scale, and the data rotation angle of the sagittal surface is based on the right scale.

  FIG. 15 is a cross-sectional view including a straight line connecting the rotation center point C2 of the eyeball and the optical center C1 of the spectacle lens according to the seventh example of the present invention. In FIG. 15, the outer side (ear side) of the spectacle lens is indicated by “Out”, and the inner side (nose side) is indicated by “In”. The central power of the spectacle lens according to this example is −6 diopters, and the distance from the optical center to the outer (ear side) end is 33 millimeters. Further, the center thickness of the spectacle lens according to the present embodiment is 1.1 millimeters. A point where the straight line intersects the refractive surface on the eye side is a reference point O, a tangent line at the reference point O of a curve representing the refractive surface on the eye side is a reference line, the reference point O is an origin, and the reference line is an X axis. Define XY Cartesian coordinates. In this embodiment, the first region is a region where the rotation angle is 30 degrees or less, the second region is a region where the rotation angle is greater than 30 degrees and is 50 degrees or less, and the third region is a rotation angle of 50 degrees. Larger area. In FIG. 13, the lens shape of the comparative example is indicated by a dotted line, and the lens shape according to the present example is indicated by a solid line.

  As shown in FIG. 15, the edge thickness (outer side) of the spectacle lens according to this example is 4.9 mm. Compared to the edge thickness (5.8 mm) of the comparative example, the thickness is 0.9 mm thinner. The spectacle lens according to the present example has a larger distance from the optical center to the outer (ear side) end portion and a third area compared to the spectacle lens according to the sixth example. Therefore, the decrease in the edge thickness is large compared to the sixth embodiment.

In the seventh embodiment,
R1 = 98.660
R2 = 96.649
R3 = 1345.400
It is.

  FIG. 16 is a diagram showing the power at each point of the spectacle lens according to the present embodiment as a difference from the central power. The horizontal axis in FIG. 16 indicates the difference from the central power (−6 diopters), and the vertical axis indicates the rotation angle. The solid line represents the meridional plane data (M), and the dotted line represents the sagittal plane data (S). The rotation angle of the data of the meridional surface is based on the left scale, and the data rotation angle of the sagittal surface is based on the right scale.

  FIG. 17 is a diagram showing the optical center of the spectacle lens according to the eighth embodiment of the present invention. The distance from the optical center to the end on the ear side (right side in the figure) is 30 millimeters, and the distance from the optical center to the end on the nose side (left side in the figure) is 25 millimeters.

  FIG. 18 is a cross-sectional view of the spectacle lens according to the eighth embodiment of the present invention, including a straight line connecting the rotation center point C2 of the eyeball and the optical center C1. In FIG. 18, the outer side (ear side) of the spectacle lens is indicated by “Out”, and the inner side (nose side) is indicated by “In”. The central power of the spectacle lens according to this example is −5.75 diopters. Further, the center thickness of the spectacle lens according to the present example is 1.0 millimeter. A point where the straight line intersects the refractive surface on the eye side is a reference point O, a tangent line at the reference point O of a curve representing the refractive surface on the eye side is a reference line, the reference point O is an origin, and the reference line is an X axis. Define XY Cartesian coordinates. In this embodiment, the first region is a region where the rotation angle is 30 degrees or less, the second region is a region where the rotation angle is greater than 30 degrees and is 45 degrees or less, and the third region is a rotation angle of 45 degrees. Larger area. In FIG. 18, the lens shape of the comparative example is indicated by a dotted line, and the lens shape according to the present example is indicated by a solid line.

  As shown in FIG. 18, the edge thickness of the outer side (ear side) of the spectacle lens according to this example is 3.8 mm. Compared to the edge thickness (4.7 mm) of the comparative example, the thickness is 0.9 mm thinner.

In the eighth embodiment,
R1 = 102.463
R2 = 100.523
R3 = 445.584
It is.

FIG. 19 is a diagram showing the frequency at each point of the spectacle lens according to the present example and the comparative example as a difference from the central frequency. The horizontal axis in FIG. 19 indicates the difference from the central power (−5.75 diopters), and the vertical axis indicates the rotation angle. The solid line represents the meridional plane data (M), and the dotted line represents the sagittal plane data (S). The thick solid line and the dotted line represent the data of this example, and the thin solid line and the dotted line represent the data of the comparative example.
FIG. 20 shows the ear-side and nose-side edges of the spectacle lens in which the central power is changed in the range from −8.50 to −3.75 diopters while the design conditions other than the power are the same as in the present embodiment. Edge and nose side edges of spectacle lenses in which the central power is changed in the range from −8.50 diopters to −3.75 diopters while the thickness and the design conditions other than the power are the same as in the comparative example. It is a figure which shows the change of thickness. A group of eyeglass lenses in which the central power is changed from the present embodiment is referred to as a group of the present embodiment, and changes in the edge thickness on the ear side and the nose side are represented by solid lines. A group of eyeglass lenses in which the central power is changed from the comparative example is referred to as a comparative example group, and changes in the edge thickness on the ear side and the nose side are indicated by dotted lines. The difference in the edge thickness between the ear side and the nose side of the group of the present example is the largest when the central power is −8.50 diopter, which is about 0.6 millimeters (indicated by A in FIG. 20). On the other hand, the difference in the edge thickness between the ear side and the nose side of the group of the comparative example is the largest when the central power is −8.50 diopter, which is about 1.8 millimeters (indicated by B in FIG. 20). As described above, the difference in edge thickness between the ear side and the nose side of the spectacle lens is extremely small in the group of this example compared with the group of the comparative example, and the appearance of the spectacle lens is improved.

  FIG. 21 is a diagram showing the optical center of the lens according to the ninth embodiment of the present invention. The distance from the optical center to the end on the ear side (right side in the figure) is 35 millimeters, and the distance from the optical center to the end on the nose side (left side in the figure) is 25 millimeters.

  FIG. 22 is a cross-sectional view of the spectacle lens according to the ninth embodiment of the present invention, including a straight line connecting the rotation center point C2 of the eyeball and the optical center C1. In FIG. 22, the outer side (ear side) of the spectacle lens is indicated by “Out”, and the inner side (nose side) is indicated by “In”. The central power of the spectacle lens according to this example is −5.75 diopters. Further, the center thickness of the spectacle lens according to the present example is 1.0 millimeter. A point where the straight line intersects the refractive surface on the eye side is a reference point O, a tangent line at the reference point O of a curve representing the refractive surface on the eye side is a reference line, the reference point O is an origin, and the reference line is an X axis. Define XY Cartesian coordinates. In this embodiment, the first region is a region where the rotation angle is 30 degrees or less, the second region is a region where the rotation angle is greater than 30 degrees and is 50 degrees or less, and the third region is a rotation angle of 50 degrees. Larger area. In FIG. 22, the lens shape of the comparative example is indicated by a dotted line, and the lens shape according to the present example is indicated by a solid line.

  As shown in FIG. 22, the outer (ear side) edge thickness of the spectacle lens according to this example is 4.6 mm. Compared to the edge thickness of the comparative example (6.0 mm), the thickness is 1.4 mm thinner.

In the ninth embodiment,
R1 = 102.463
R2 = 100.571
R3 = 2606.515
It is.

FIG. 23 is a diagram showing the frequency at each point of the spectacle lens according to the present example and the comparative example as a difference from the central frequency. The horizontal axis in FIG. 23 indicates the difference from the central power (−5.75 diopters), and the vertical axis indicates the rotation angle. The solid line represents the meridional plane data (M), and the dotted line represents the sagittal plane data (S). The thick solid line and the dotted line represent the data of this example, and the thin solid line and the dotted line represent the data of the comparative example.
FIG. 24 shows the ear-side and nose-side edges of a spectacle lens in which the central power is changed in the range from −8.50 to −3.75 diopters while the design conditions other than the power are the same as in this embodiment. Edge and nose side edges of spectacle lenses in which the central power is changed in the range from −8.50 diopters to −3.75 diopters while the thickness and the design conditions other than the power are the same as in the comparative example. It is a figure which shows the change of thickness. A group of eyeglass lenses in which the central power is changed from the present embodiment is referred to as a group of the present embodiment, and changes in the edge thickness on the ear side and the nose side are represented by solid lines. A group of eyeglass lenses in which the central power is changed from the comparative example is referred to as a comparative example group, and changes in the edge thickness on the ear side and the nose side are indicated by dotted lines. The difference in the edge thickness between the ear side and the nose side of the group of this example is the largest when the central power is −8.50 diopter, and is about 1.8 millimeters (indicated by A in FIG. 24). On the other hand, the difference in the edge thickness between the ear side and the nose side of the group of the comparative example is the largest at about 4.1 mm when the central power is −8.50 diopter (indicated by B in FIG. 24). As described above, the difference in edge thickness between the ear side and the nose side of the spectacle lens is extremely small in the group of this example compared with the group of the comparative example, and the appearance of the spectacle lens is improved.

  In the above embodiments, spectacle lenses designed based on a single refractive power have been described, but the present invention can also be applied to progressive power lenses, astigmatic power lenses, and the like.

  FIG. 25 is a flowchart showing a method for manufacturing a spectacle lens according to an embodiment of the present invention.

  In step S25010 of FIG. 25, for example, a fingerprint value of a spectacle wearer is obtained at a spectacle store.

  In step S25020 of FIG. 25, for example, a spectacle lens is designed by the designing method according to the present invention based on the fingerprint value of the spectacle wearer using a manufacturer's computer. The fingerprint value of the spectacle wearer may be input to the personal computer of the spectacle store and transmitted to the manufacturer's computer via a network such as the Internet or an intranet.

  In step S25030 in FIG. 25, the spectacle lens is processed in the manufacturer.

  In step S25040 of FIG. 25, the spectacle lens processed by the manufacturer is framed in, for example, a spectacle store to complete the spectacles.

  As described above, according to the present invention, the edge thickness is thin and the difference in the edge thickness between the ear side and the nose side is small in consideration of the characteristics of the wearer regarding the usage state of the spectacle lens using the visual pattern value or the like. The spectacle lens can be designed. In addition, a spectacle lens having a thin edge thickness and a small difference in edge thickness between the ear side and the nose side in consideration of the wearer's characteristics regarding the usage state of the spectacle lens can be obtained.

3 is a flowchart illustrating a spectacle lens design method according to an embodiment of the present invention. It is a figure for demonstrating a visual print value. It is a figure of the cross section containing the straight line which connects the rotation center point of the eyeball, and the optical center of the spectacle lens by 1st Example of this invention. It is a figure which shows the difference from the center frequency of the power in each point of the spectacle lens by the 1st Example of this invention. It is a figure of the cross section containing the straight line which connects the rotation center point of the eyeball, and the optical center of the spectacle lens by the 2nd Example of this invention. It is a figure which shows the difference from the central frequency of the power in each point of the spectacle lens by the 2nd Example of this invention. It is a figure of the cross section containing the straight line which connects the rotation center point of the eyeball, and the optical center of the spectacle lens by the 3rd Example of this invention. It is a figure which shows the difference from the central frequency of the power in each point of the spectacle lens by the 3rd Example of this invention. It is a figure of the cross section containing the straight line which connects the rotation center point of the eyeball, and the optical center of the spectacle lens by the 4th Example of this invention. It is a figure which shows the difference from the center frequency of the power in each point of the spectacle lens by the 4th Example of this invention. It is a figure of the cross section containing the straight line which connects the rotation center point of an eyeball, and an optical center of the spectacle lens by the 5th Example of this invention. It is a figure which shows the difference from the central frequency of the power in each point of the spectacle lens by the 5th Example of this invention. It is a figure of the cross section containing the straight line which connects the rotation center point of an eyeball, and an optical center of the spectacle lens by the 6th Example of this invention. It is a figure which shows the difference from the center frequency of the power in each point of the spectacle lens by the 6th Example of this invention. It is a figure of the cross section containing the straight line which connects the rotation center point of an eyeball, and an optical center of the spectacle lens by the 7th Example of this invention. It is a figure which shows the difference from the central frequency of the power in each point of the spectacle lens by the 7th Example of this invention. It is a figure which shows the optical center of the spectacle lens by the 8th Example of this invention. It is a figure of the cross section containing the straight line which connects the rotation center point C2 of the eyeball, and the optical center C1 of the spectacle lens by the 8th Example of this invention. It is the figure shown with the difference from the center frequency of the power in each point of the spectacle lens by the 8th Example and comparative example of this invention. While the design conditions other than the power are the same as those in the eighth embodiment of the present invention, the eyeglass lens with the central power varied in the range from −8.50 diopter to −3.75 diopter, While the design conditions other than the change in the rim thickness and the power are the same as those in the comparative example, the ear lens and the nasal lens of the spectacle lens in which the central power is changed in the range from −8.50 diopter to −3.75 diopter. It is a figure which shows the change of edge thickness. It is a figure which shows the optical center of the lens by the 9th Example of this invention. It is a figure of the cross section containing the straight line which connects the rotation center point C2 of the eyeball, and the optical center C1 of the spectacle lens by the 9th Example of this invention. It is the figure shown with the difference from the center frequency of the power in each point of the spectacle lens by the 9th Example and comparative example of this invention. While the design conditions other than the power are the same as those of the ninth embodiment of the present invention, the ear lens and the nasal lens of the spectacle lens in which the central power is changed in a range from −8.50 to −3.75 diopters are used. While the design conditions other than the change in the rim thickness and the power are the same as those in the comparative example, the ear lens and the nasal lens of the spectacle lens in which the central power is changed in the range from −8.50 diopter to −3.75 diopter. It is a figure which shows the change of edge thickness. 3 is a flowchart illustrating a method for manufacturing a spectacle lens according to an embodiment of the present invention.

Explanation of symbols

C1 ... optical center, C2 ... rotation center point of eyeball, O ... reference point

Claims (17)

Based on the prescription data of the spectacle wearer, the curvature radius on the object side and the curvature radius on the eyeball side of the spectacle lens are determined,
On at least one surface of the spectacle lens, a first region that is frequently used by the spectacle wearer and a second region that is not frequently used by the spectacle wearer are determined based on the rotation angle of the eyeball of the spectacle wearer. ,
The curvature radius in the second region is corrected by continuously changing the radius of curvature of the lens toward the peripheral portion in a direction in which the edge thickness of the lens becomes thinner than the curvature radius determined based on the prescription data. Design method for eyeglass lenses.   2. The spectacle lens design method according to claim 1, wherein an upper limit value of a rotation angle of the first region is in a range of 20 degrees to 30 degrees.   3. The spectacle lens design method according to claim 1, wherein an upper limit value of a rotation angle of the first region is determined based on a visual pattern value of the spectacle wearer.   4. The spectacle lens design method according to claim 1, wherein an upper limit value of a rotation angle of the second region is in a range of 40 degrees to 60 degrees. 5.   5. The spectacle lens design method according to claim 1, wherein an upper limit value of a rotation angle of the second region is determined based on a visual pattern value of the spectacle wearer. 6.   In the third region where the rotation angle is larger than the upper limit value of the rotation angle of the second region, a curve showing a predetermined cross section including a straight line connecting the rotation center point of the eyeball and the optical center of the at least one surface. The spectacle lens design method according to claim 1, wherein the shape of the curve is corrected so as to have an inflection point. In a predetermined cross section including a straight line connecting the center of rotation of the eyeball and the optical center of the spectacle lens, a point where the straight line intersects the at least one surface is a reference point, and a tangent line at the reference point of the at least one surface XY orthogonal coordinates with the reference point as the origin, the reference point as the X axis, and the X coordinate of an arbitrary point in the second region

age,

The correction amount in the Y-axis direction of the curve representing the at least one surface in

age,

Is a constant,

The spectacle lens design method according to claim 1, wherein the spectacle lens is a design method.   A spectacle lens manufacturing method, comprising: manufacturing a spectacle lens designed by the spectacle lens design method according to claim 1. Find the fingerprint value of the spectacle wearer,
A spectacle lens is designed by the spectacle lens design method according to any one of claims 1 to 7 based on the fingerprint value,
Processing eyeglass lenses,
A method for manufacturing spectacles, in which a spectacle lens is placed in a frame.   10. The method for manufacturing spectacles according to claim 9, wherein a fingerprint value of a spectacle wearer is obtained in a spectacle store, and the processed spectacle lens is put in a frame.   At least one surface is divided into a first region where the spectacle wearer's use frequency is high and a second region where the spectacle wearer's use frequency is low based on the rotation angle of the spectacle wearer's eyeball, The curvature radius in the first region is determined based on the prescription data of the spectacle wearer, and the curvature radius in the second region is smaller than the curvature radius determined based on the prescription data. A spectacle lens, which is modified by being continuously changed toward a peripheral portion in a certain direction.   The spectacle lens according to claim 11, wherein an upper limit value of a rotation angle of the first region is in a range of 20 degrees to 30 degrees.   The spectacle lens according to claim 11 or 12, wherein an upper limit value of a rotation angle of the first region is determined based on a visual pattern value of a spectacle wearer.   14. The spectacle lens according to claim 11, wherein an upper limit value of a rotation angle of the second region is in a range of 40 degrees to 60 degrees.   The spectacle lens according to any one of claims 11 to 14, wherein an upper limit value of a rotation angle of the second region is determined based on a vision pattern value of the spectacle wearer.   In the third region where the rotation angle is larger than the upper limit value of the rotation angle of the second region, a curve showing a predetermined cross section including a straight line connecting the rotation center point of the eyeball and the optical center of the at least one surface. The spectacle lens according to claim 11, further comprising an inflection point. In a predetermined cross section including a straight line connecting the center of rotation of the eyeball and the optical center of the spectacle lens, a point where the straight line intersects the at least one surface is a reference point, and a tangent line at the reference point of the at least one surface XY orthogonal coordinates with the reference point as the origin and the reference line as the X axis, and the X coordinate of an arbitrary point in the second region

age,

The correction amount in the Y-axis direction of the curve representing the at least one surface in

age,

Is a constant,

The spectacle lens according to claim 11, wherein the eyeglass lens is a spectacle lens.

Images