eyeglasses

Abstract

The present invention provides eyeglasses in which the difference in appearance compared to when a wearer wears trial lenses is small. Provided are eyeglasses including an eyeglass frame and two eyeglass lenses attached to the eyeglass frame, wherein each of the two eyeglass lenses is such that, in a direction parallel to a line A connecting the fitting points of the two eyeglass lenses, a peripheral region, which is located on the side of the eyeglass frame opposite the bridge side from a line B intersecting the line A at a right angle and passing through a position shifted from a fitting point and toward the side of the eyeglass frame opposite the bridge side by a distance L1 determined by using formula (1): L1=(PD-BW) / 2, has a lower transmittance or a shorter focal length relative to the central region including the fitting point or is a different color than the central region. Note that PD indicates the interpupillary distance of the wearer of the eyeglasses. BW indicates the bridge width of the eyeglass frame.

Description

glasses

[0001] This disclosure relates to eyeglasses.

[0002] Patent Document 1 describes a nighttime light-shielding lens with a luminous transmittance exceeding 75%, characterized in that the average transmittance in the 400-500 nm wavelength band of the peripheral region is higher than the average transmittance in the 400-500 nm wavelength band of the central region.

[0003] Japanese Patent Publication No. 2012-042522

[0004] This disclosure relates to eyeglasses, comprising an eyeglass frame and two eyeglass lenses mounted on the eyeglass frame, wherein, for each of the two eyeglass lenses, along a direction parallel to line A connecting the fitting points of the two eyeglass lenses, a distance L1 from the fitting point toward the opposite side of the bridge of the eyeglass frame, determined by equation (1), passes through a line B perpendicular to line A, and the peripheral region opposite the bridge of the eyeglass frame has lower transmittance, a shorter focal length, or a color difference between the peripheral region and the central region than the central region including the fitting point. Equation (1) L1 = (PD - BW) / 2 where PD represents the interpupillary distance of the eyeglass wearer, and BW represents the bridge width of the eyeglass frame.

[0005] Another aspect of this disclosure relates to eyeglasses, comprising an eyeglass frame and two eyeglass lenses mounted on the eyeglass frame, wherein, for each of the two eyeglass lenses, the contour line of the eyeglass lens passes through a position at a distance L1 from the fitting point toward the opposite side of the bridge of the eyeglass frame, along a direction parallel to line A connecting the respective fitting points of the two eyeglass lenses, as determined by equation (1). Equation (1) L1 = (PD - BW) / 2 where PD represents the interpupillary distance of the eyeglass wearer, and BW represents the bridge width of the eyeglass frame.

[0006] Figure 1 is a schematic diagram showing an example of eyeglasses according to the first embodiment of the present invention. Figure 2 is a schematic diagram showing another example of eyeglasses according to the present invention. Figure 3 is a schematic diagram showing another example of eyeglasses according to the present invention. Figure 4 is a schematic diagram showing another example of eyeglasses according to the present invention. Figure 5 is a schematic diagram showing another example of eyeglasses according to the present invention. Figure 6 is a schematic diagram showing an example of eyeglasses according to the second embodiment of the present invention.

[0007] The eyeglasses described in this disclosure are described in detail below.

[0008] When making eyeglasses, it is necessary to determine the prescription for each wearer. The prescription for eyeglass lenses is determined after objective refractive index measurement using equipment, as well as after confirming that there are no subjective problems with vision using an eye examination frame and eye examination lenses (also called trial lenses in the case of progressive lenses). However, when a wearer puts on the finished eyeglasses, there is a difference in vision compared to when wearing the eye examination lenses, and this can cause discomfort.

[0009] The eyeglasses described herein show little difference in vision compared to when the wearer is wearing prescription lenses.

[0010] The following descriptions of constituent elements may be based on representative embodiments of this disclosure, but this disclosure is not limited to such embodiments.

[0011] In this specification, "~" is used to mean that the numbers before and after it are included as the lower and upper limits, respectively.

[0012] [Eyeglasses] [First Embodiment] An example of eyeglasses according to the first embodiment of the present disclosure is the eyeglasses 10a shown in Figure 1.

[0013] In Figure 1, the eyeglasses 10a comprises an eyeglass frame 12 and two eyeglass lenses (a right-eye lens 14R and a left-eye lens 14L) attached to the eyeglass frame 12. Figure 1 also shows the positions of the wearer's right eye Er and left eye El superimposed on the eyeglasses 10a when the wearer is wearing them. The same applies to Figures 2 to 6 below.

[0014] The eyeglass frame 12 is a conventionally known eyeglass frame having a lens holder portion (hereinafter also referred to as the right rim) 12b for holding the right eye lens 14R, a lens holder portion (hereinafter also referred to as the left rim) 12c for holding the left eye lens 14L, a bridge 12a connecting the right rim 12b and the left rim 12c, a right temple 12d attached to the end of the right rim 12b opposite to the bridge 12a, and a left temple 12e attached to the end of the left rim 12c opposite to the bridge 12a. The right temple 12d and the left temple 12e are each attached to the right rim 12b or the left rim 12c via a hinge or the like, and may be foldable.

[0015] In the eyeglasses 10a of this disclosure, for each of the two eyeglass lenses (right eye eyeglass lens 14R and left eye eyeglass lens 14L), along a direction parallel to line A connecting the fitting points of the two eyeglass lenses, a distance L1 is reached from the fitting point toward the opposite side of the bridge 12a of the eyeglass frame 12, as determined by the following formula (1). The peripheral region on the opposite side of the bridge 12a of the eyeglass frame 12 from line B, which extends in a direction perpendicular to the direction parallel to line A, has lower transmittance, a shorter focal length, or exhibits a color difference between the peripheral region and the central region compared to the central region including the fitting point. Formula (1) L1 = (PD - BW) / 2

[0016] Note that PD represents the interpupillary distance of the wearer of glasses, and BW represents the bridge width of the eyeglass frame.

[0017] This point will be explained in detail using Figure 1.

[0018] As shown in Figure 1, the interpupillary distance PD is the distance between the pupil of the wearer's right eye Er and the pupil of their left eye El. The bridge width BW is the width of the bridge 12a of the eyeglass frame 12, and can also be defined as the shortest distance between the opening in the right rim 12b for mounting the right eye lens 14R and the opening in the left rim 12c for mounting the left eye lens 14L.

[0019] Distance L1 is the value obtained by subtracting the bridge width BW from the interpupillary distance PD and dividing by 2, as shown in equation (1) above. This distance L1 corresponds to the distance from the bridge 12a side end of the spectacle lens to the pupil (fitting point).

[0020] Since the positions of the eyes are not always symmetrical, if there is a difference between the left and right eyes, the distance L1 may be calculated using the above formula (1), and then the distance L1 may be corrected for the right and left eyes respectively to match the difference in pupil size, and the distance L1 for the right eye spectacle lens 14R and the distance L1 for the left eye spectacle lens 14L may be calculated and used.

[0021] Furthermore, as shown in Figure 1, line A is defined as the line connecting the fitting point of the right eye's spectacle lens 14R and the fitting point of the left eye's spectacle lens 14L. In Figure 1, the fitting points are shown to coincide with the position of the pupil.

[0022] On the line segment of line A, position P is defined as a position L1 away from the fitting point in the direction opposite to the bridge 12a. That is, for the right eye spectacle lens 14R, position P is a position L1 away from the fitting point toward the right temple 12d along line A, and for the left eye spectacle lens 14L, position P is a position L1 away from the fitting point toward the left temple 12e along line A.

[0023] Note that the distance between position P and the fitting point may deviate from the calculated distance L1 by an amount corresponding to the measurement error. Specifically, position P should be within a range of L1 ± 2 mm from the fitting point, more preferably within a range of L1 ± 1.5 mm, and even more preferably within a range of L1 ± 1.0 mm.

[0024] In the right-eye spectacle lens 14R, line B is defined as a line segment passing through position P and perpendicular to line A. The region on the bridge 12a side of line B is defined as the central region 15R, and the region including line B and extending from line B to the right temple 12d is defined as the peripheral region 16R. The central region 15R includes the fitting point of the right-eye spectacle lens 14R. Similarly, in the left-eye spectacle lens 14L, line B is defined as a line segment passing through position P and perpendicular to line A. The region on the bridge 12a side of line B is defined as the central region 15L, and the region including line B and extending from line B to the left temple 12e is defined as the peripheral region 16L. The central region 15L includes the fitting point of the left-eye spectacle lens 14L.

[0025] In the example shown in Figure 1, in the right eye spectacle lens 14R, the central region 15R is not stained, while the peripheral region 16R is, for example, uniformly stained and has a lower transmittance than the central region 15R. Therefore, the transmittance in the central region 15R is approximately constant within the central region 15R, and the transmittance in the peripheral region 16R is also approximately constant within the peripheral region 16R. Similarly, in the left eye spectacle lens 14L, the central region 15L is not stained, while the peripheral region 16L is, for example, uniformly stained and has a lower transmittance than the central region 15L. Therefore, the transmittance in the central region 15L is approximately constant within the central region 15L, and the transmittance in the peripheral region 16L is also approximately constant within the peripheral region 16L.

[0026] In the following explanation, if there is no need to distinguish between the right eye spectacle lens 14R and the left eye spectacle lens 14L, it will be referred to as spectacle lens 14; if there is no need to distinguish between the central region 15R and the central region 15L, it will be referred to as central region 15; and if there is no need to distinguish between the peripheral region 16R and the peripheral region 16L, it will be referred to as peripheral region 16. Also, in the following explanation, when referring to the lens holder (rim), it refers to the lens holder 12b for the right eye spectacle lens 14R and the lens holder 12c for the left eye spectacle lens 14L. Furthermore, when referring to the temple, it refers to the right temple 12d for the right eye spectacle lens 14R and the left temple 12e for the left eye spectacle lens 14L.

[0027] Trial lenses are manufactured in a symmetrical circular shape, and the examination frame (eyeglass frame for eye examination) is selected to match the wearer's interpupillary distance (PD), so the wearer's pupil is always located at the geometric center of the trial lens. However, in the case of actually manufactured eyeglasses, the lens-holding part (rim) of the eyeglass frame has a variety of shapes, and the pupil is not necessarily located at the geometric center of the eyeglass lens (lens-holding part). In many cases, the lens-holding part (rim) has a shape that is long in the left-right direction, and the pupil is located on the nasal side (bridge side) of the geometric center of the eyeglass lens (lens-holding part), and the field of view is relatively wider on the temporal side (temple side) than the pupil. In other words, as shown in Figure 1, the distance L1 from the bridge 12a to the pupil is less than half the width LW of the eyeglass lens on line A. In that case, the edge of the eyeglass lens is used in the field of view on the temporal side (temple side) than the pupil, but the edge of the eyeglass lens has greater distortion than the central part. According to the inventors' research, in actual eyeglasses, the edges with such significant distortion are used, causing wearers to perceive a difference in vision compared to when wearing optometric lenses, and to experience discomfort with their vision. Furthermore, because the field of vision on the temporal side (temple side) of the pupil is wider than the field of vision on the nasal side (bridge side) of the pupil, the left-right imbalance in the field of vision through the eyeglass lenses causes a difference in vision compared to when wearing optometric lenses, and also causes discomfort to the wearer.

[0028] In contrast, the eyeglasses of this disclosure reduce the influence of the peripheral field of view, where distortion is greater, by making the transmittance (visible transmittance) of the peripheral region 16 of the eyeglass lens 14, which is determined based on the distance L1 obtained by the above formula (1), lower than the transmittance (visible transmittance) of the central region 15. Furthermore, it reduces the left-right imbalance in the field of view seen through the eyeglass lens 14, thereby reducing the difference in how things look compared to when wearing optometric lenses, and also reducing discomfort.

[0029] Here, the difference between the luminous transmittance of the central region 15 and the luminous transmittance of the peripheral region 16 is preferably 5% or more, more preferably 10% or more, and even more preferably 15% or more, from the viewpoint of visibility. The upper limit is 100%. In this specification, luminous transmittance is also simply referred to as transmittance.

[0030] The luminous transmittance can be measured using a spectrophotometer (for example, the U-4100 manufactured by Hitachi High-Technologies Corporation).

[0031] An example of a specific measurement procedure is shown below. Using a spectrophotometer equipped with an integrating sphere (Hitachi High-Technologies Corporation U-4100), the reference light is measured without a sample. Next, the convex surface of the spectacle lens is placed facing the incident light side, and the transmitted light is measured to determine the spectral transmittance of the spectacle lens. The light beam size at the sample position is approximately 11 mm vertically x 8 mm horizontally, the measurement wavelength range is 380 nm to 780 nm, the scan speed is 300 nm / min, the sampling interval is 0.50 nm, the number of measurements is 1, and the slit width is 5 nm. Subsequently, the luminous transmittance Y value is calculated from the obtained spectral transmittance using the color calculation program provided in the U-4100.

[0032] Furthermore, luminous transmittance can also be calculated according to JIS T7333:2018 by measuring the spectral transmittance using a spectrophotometer (for example, Hitachi High-Technologies Corporation's U-4100, etc.).

[0033] Furthermore, the luminous transmittance of the central region 15 can be determined by measuring the spectral transmittance described above at the fitting point of the spectacle lens 14. If the spectacle lens 14 is a progressive lens, measurements may be taken at one or more of the prism reference point, distance vision measurement point, and near vision measurement point. Additionally, the luminous transmittance of the central region 15 may be the average value of multiple points within the region, including the fitting point.

[0034] Furthermore, the luminous transmittance of the peripheral region 16 can be determined by measuring the spectral transmittance at position P of the spectacle lens. Alternatively, the luminous transmittance of the peripheral region 16 may be the average value of multiple points within the region, including position P.

[0035] Further, the central region 15 of the spectacle lens 14 may be dyed or undyed (it may be a clear lens). Even when the central region 15 is dyed, it is only required that the difference between the luminous transmittance of the central region 15 and the luminous transmittance of the peripheral region 16 is 5% or more.

[0036] The spectacle lens may be dyed by dyeing at least one surface of the spectacle lens with a predetermined dyeing solution. Further, the spectacle lens can also be colored by providing a film containing a colorant on the spectacle lens, or by providing an interference film that transmits only specific wavelengths. Further, when the central region 15 is dyed, a colorant may be mixed into the lens base material itself.

[0037] Here, in the example shown in FIG. 1, it is assumed that the transmittance in the central region 15 is substantially constant within the region, and the transmittance in the peripheral region 16 is substantially constant within the region, but the present invention is not limited thereto.

[0038] FIG. 2 is a diagram schematically showing another example of the spectacles of the present invention.

[0039] The spectacles 10b shown in FIG. 2 have the same configuration as the spectacles 10a shown in FIG. 1 except that the dyeing states in the central region 15 and the peripheral region 16 of the spectacle lens 14 are different, so the following description will mainly focus on the different parts.

[0040] In the spectacles 10b shown in FIG. 2, the two spectacle lenses 14R and 14L are each dyed such that the density gradually increases (in a gradation) from a part of the central region 15 (15R, 15L) to the peripheral region 16 (16R, 16L) in a direction parallel to the line A connecting the fitting points of the two spectacle lenses 14R and 14L. In the illustrated example, dyeing starts at a position closer to the temple side than the fitting point of the central region 15, and the dyeing density increases toward the temple side (the peripheral region 16).

[0041] Thus, even if the eyeglass lens 14 is dyed in a gradient and there is no clear boundary between the dyed area (area with low transmittance) and the undyed area (area with high transmittance), the central area 15 and the peripheral area 16 can be defined using the line B defined by the distance L1 obtained by the above formula (1) as the boundary line, and it is sufficient that the transmittance of the peripheral area 16 is lower than the transmittance of the central area 15. In other words, even if the eyeglass lens 14 is dyed in a gradient, it is sufficient that the difference between the luminous transmittance at the fitting point of the central area 15 and the luminous transmittance at position P is 5% or more.

[0042] When the dyed areas (areas with low transmittance) and the undyed areas (areas with high transmittance) are dyed in a gradient, the fashionability can be enhanced.

[0043] Furthermore, in the example shown in Figure 1, in the eyeglass lens 14, line B is used as the boundary line, with the area on the bridge 12a side of line B being defined as the central region 15, and the area including line B and extending from line B towards the temple (opposite side of the bridge 12a) being defined as the peripheral region 16. However, the method is not limited to this, and the peripheral region 16 only needs to include line B and the area extending from line B towards the temple, and the peripheral region 16 may also include a part of the area on the bridge 12a side of line B.

[0044] Figure 3 schematically shows another example of the eyeglasses of the present invention.

[0045] The eyeglasses 10c shown in Figure 3 have the same configuration as the eyeglasses 10a shown in Figure 1, except that the shape of the central region 15 and peripheral region 16 of the eyeglass lens 14 is different. Therefore, the following explanation will mainly focus on the differences.

[0046] In the eyeglasses 10c shown in Figure 3, the peripheral region 16 of the eyeglass lens 14 includes the region from line B towards the temple, as well as a portion of the region closer to the bridge 12a than line B.

[0047] Specifically, in the example shown in Figure 3, the boundary line between the central region 15 and the peripheral region 16 is set such that the shape of the central region 15 of the spectacle lens 14 is approximately symmetrical with respect to line C. Line C is a straight line that passes through the fitting point of the spectacle lens 14 and is parallel to line B. That is, the central region 15 has a shape that is approximately symmetrical in the left-right direction. Therefore, it can also be said that the boundary line between the central region 15 and the peripheral region 16 is approximately symmetrical with respect to the shape of the bridge 12a side of the lens holding part of the spectacle frame 12. Alternatively, the boundary line between the central region 15 and the peripheral region 16 can also be said to be a curve that passes through position P and divides the spectacle lens 14 into the bridge 12a region and the temple side region.

[0048] By making the shape of the central region 15 approximately symmetrical with respect to line C, the influence of the field of view at the edges, where distortion is significant, can be reduced, and the left-right imbalance in the field of view seen through the spectacle lens 14 can be further reduced.

[0049] Figure 4 is a schematic diagram showing another example of the eyeglasses of the present invention.

[0050] The eyeglasses 10d shown in Figure 4 have the same configuration as the eyeglasses 10a shown in Figure 1, except that the shape of the central region 15 and peripheral region 16 of the eyeglass lens 14 is different. Therefore, the following explanation will mainly focus on the differences.

[0051] In the eyeglasses 10d shown in Figure 4, the peripheral region 16 of the eyeglass lens 14 includes the region from line B towards the temple, as well as a portion of the region closer to the bridge 12a than line B.

[0052] Specifically, in the example shown in Figure 4, the boundary line between the central region 15 and the peripheral region 16 is a curve with radius (curvature) L1 centered on the fitting point of the spectacle lens 14. Therefore, the boundary line between the central region 15 and the peripheral region 16 can also be described as a curve that passes through position P and divides the spectacle lens 14 into the bridge region 12a and the temple region.

[0053] By making the boundary line between the central region 15 and the peripheral region 16 a semicircle with radius L1, the influence of the field of view at the edges, where distortion is significant, can be further reduced, and the left-right imbalance in the field of view seen through the spectacle lens 14 can be further reduced.

[0054] Furthermore, the shapes of the central region 15 and the peripheral region 16, that is, the shape of the boundary line between the central region 15 and the peripheral region 16, are not limited to the example described above; it is sufficient that the peripheral region 16 includes at least the area on the crane side from line B.

[0055] Preferably, the boundary line between the central region 15 and the peripheral region 16 is a straight line or curve passing through position P and dividing the spectacle lens 14 into the bridge region 12a region and the temple region. In this case, the central region 15 is the region at a distance L1 from the fitting point in each direction to the left and right along the line A connecting the two fitting points, thus further reducing the left-right imbalance in the field of view through the spectacle lens 14.

[0056] Furthermore, it is preferable that the shape of the central region 15 includes at least a region that is substantially symmetric with respect to line C, which passes through the fitting point of the spectacle lens 14 and is parallel to line B. Alternatively, it is preferable that the shape of the central region 15 includes at least a circular region with radius L1 centered on the fitting point.

[0057] Furthermore, in the examples described above, the method of lowering the transmittance of the peripheral region 16 to that of the central region 15 was to stain the peripheral region 16, but this is not the only method. Methods for lowering the transmittance of the peripheral region 16 include attaching an opaque or semi-transparent tape to the peripheral region 16, or arranging a light scattering structure in the peripheral region 16.

[0058] Methods for staining the peripheral region 16 include coloring the lens substrate itself, staining the surface of the lens substrate, staining a coating (various functional coatings) provided on the lens substrate, and providing a colored coating such as paint.

[0059] A light-scattering structure is a structure that scatters light, and because light is diffusely reflected by the light-scattering structure, the transmittance can be reduced. Specific examples of methods for arranging the light-scattering structure include: forming fine irregularities on the surface of the lens substrate in the peripheral region 16 by sandblasting or the like; forming a film having an irregular structure on the lens substrate in the peripheral region 16; mixing fine particles with different refractive indices into the lens substrate in the peripheral region 16; forming a film containing fine particles with different refractive indices on the lens substrate in the peripheral region 16; and arranging a microlens array on the lens substrate in the peripheral region 16.

[0060] These methods may be performed on the front surface of the eyeglass lens (the side opposite the wearer), on the back surface (the side facing the wearer), or on both sides.

[0061] Furthermore, if a method is used to reduce the transmittance of the peripheral area 16 by attaching an opaque or semi-transparent tape to the peripheral area 16, the tape can be removed after the user has become accustomed to seeing without being conscious of the peripheral area 16's field of vision. In other words, it can also be used as a training aid.

[0062] In the example described above, the peripheral region 16 of the spectacle lens 14 was configured to have lower transmittance than the central region 15 (hereinafter also referred to as requirement A), but the invention is not limited to this. In the spectacle of this disclosure, the peripheral region 16 of the spectacle lens 14 may have a shorter focal length than the central region 15 (hereinafter also referred to as requirement B), or the peripheral region 16 and the central region 15 of the spectacle lens 14 may have a color difference (hereinafter also referred to as requirement C). Furthermore, the spectacle of this disclosure only needs to satisfy at least one of requirements A to C, and may satisfy two or more.

[0063] In addition, the ranges of the central region 15 and the peripheral region 16 in the cases of requirements B and C are the same as in the case of requirement A described above.

[0064] For configurations where the peripheral region 16 has a shorter focal length than the central region 15 (Requirement B), it is preferable that the lens power of the peripheral region 16 differs from that of the central region 15 by 0.5 diopters or more, more preferably by 1.0 diopter or more, and even more preferably by 1.5 diopters or more. Furthermore, the upper limit of the difference in lens power is preferably 5.0 diopters or less, and more preferably 4.0 diopters or less.

[0065] By configuring the peripheral region 16 of the spectacle lens 14 to have a shorter focal length than the central region 15, defocus can be created in the peripheral region 16, reducing the impact of distortion in the peripheral field of view. Furthermore, the left-right imbalance in the field of view through the spectacle lens 14 can be reduced. This reduces the difference in vision compared to wearing a standard optometrial lens, and also reduces discomfort.

[0066] Furthermore, even if the focal length of the peripheral region 16 of the spectacle lens 14 is longer than the focal length of the central region 15, defocus can still be produced in the peripheral region 16. The lens power of the peripheral region 16 may be in the positive direction (myopic defocus, where the focal point is in front of the retina) or the negative direction (hyperopic defocus, where the focal point is behind the retina), but the positive direction is preferable as it is less affected by accommodation by the crystalline lens and more reliably produces defocus.

[0067] Examples of methods for making the focal length of the peripheral region 16 shorter than the focal length of the central region 15 include using a multifocal lens where the lens shape of the central region 15 and the lens shape of the peripheral region 16 are different, thereby making the focal length of the peripheral region 16 shorter than the focal length of the central region 15, and arranging a large number of microlenses (microlens arrays) 20 in the peripheral region 16, as shown in Figure 5, to make the overall focal length of the peripheral region 16 shorter than the focal length of the central region 15.

[0068] Figure 5 is a schematic diagram showing another example of the eyeglasses of the present invention. The eyeglasses 10e shown in Figure 5 have the same configuration as the eyeglasses 10a shown in Figure 1, except that instead of the peripheral region 16 of the eyeglass lens 14 being stained, a large number of microlenses 20 are arranged therein.

[0069] The focal length can be determined from the refractive index of the lens material and the shape of the mold used to manufacture the lens. Alternatively, it can be calculated from the surface shape of the lens.

[0070] Next, we will describe a configuration (Requirement C) in which the peripheral region 16 and the central region 15 of the spectacle lens 14 have a color difference. As mentioned above, both the central region 15 and the peripheral region 16 of the spectacle lens 14 may be tinted. In this case, even if the difference in transmittance between the central region 15 and the peripheral region 16 is less than 5%, if the peripheral region 16 and the central region 15 have a color difference, the wearer will unconsciously recognize that the central region 15 and the peripheral region 16 are different regions due to the difference in color. Therefore, the effect of the peripheral field of view, which has a large distortion, can be reduced. In addition, the left-right imbalance in the field of view through the spectacle lens 14 can be reduced. This reduces the difference in how things look when wearing an ophthalmic lens and also reduces discomfort.

[0071] The color difference ΔE00 between the peripheral region 16 and the central region 15 should be 0.6 or greater, more preferably 2.0 or greater, and even more preferably 3.0 or greater. The upper limit of the color difference ΔE00 is 33, and exceeding this value will cause discomfort. A color difference ΔE00 of 30 or less is more preferably, and even more preferably 20 or less.

[0072] In this disclosure, the color difference is a color difference ΔE00 obtained by introducing coefficients corresponding to the values ​​of lightness, saturation, and hue in order to correct the visual inconsistencies of CIELAB.

[0073] L * a * b * The coordinates in the display change depending on the reference light source. In this disclosure, values ​​calculated using the CIE standard light source D65 with a 2-degree field of view, which is standard for outdoor daylight, are used as the reference light source.

[0074] L* a * b * The color difference in display is represented by L in each of the central region 15 (fitting point) and the peripheral region 16 (position P) of the spectacle lens 14 * a * b * coordinates are measured with a spectrophotometer (e.g., U-4100 manufactured by Hitachi High-Technologies Corporation) using a D65 light source (2° field of view) as the reference light, and the L of the two obtained regions * a * b * The color difference ΔE00 can be calculated and obtained from the coordinates.

[0075] An example of a specific measurement procedure is shown below. Using a spectrophotometer equipped with an integrating sphere (U-4100 manufactured by Hitachi High-Technologies Corporation), reference light is measured without a sample. Next, the spectacle lens is placed with its convex surface facing the incident light side, and the spectral transmittance is measured by measuring transmitted light at each position of the central region 15 and the peripheral region 16. The light beam size at the sample position is approximately 11 mm in length × approximately 8 mm in width, the measurement wavelength range is 380 nm to 780 nm, the scanning speed is 300 nm / min, the sampling interval is 0.50 nm, the number of measurements is 1, and the slit width is 5 nm.

[0076] It should be noted that, as described above, when the light beam size used for measurement is relatively large, the transmittance of the peripheral region 16 may be measured with the center position of the light beam closer to the temple side than position P. In this case, it is preferable that the light beam passes through position P.

[0077] Subsequently, from the obtained spectral transmittance, the luminous transmittance Y value and L when a D65 light source (2° field of view) is used as the reference light are obtained using the color calculation program provided in U-4100 * value, a * value, b * are calculated.

[0078] Finally, the method for calculating the color difference ΔE00 is described in the literature (Gaurav Sharma, et al., "The CIEDE2000 Color-Difference Formula: Implementation Notes, Supply Test Data, and Mathematical Observations, COLOR research and application, Volume 30, Number 1, February) Using the spreadsheet provided by the authors of the 2005 document (http: / / www2.ece.rochester.edu / ~gsharma / ciede2000 / ) and the L of the two regions (central region 15 and peripheral region 16) measured earlier, * Value, a * value, b * It is calculated from the value.

[0079] Furthermore, the spectral transmittance of the central region 15 can be measured at the fitting point of the spectacle lens. If the spectacle lens is a progressive lens, the measurement may be performed at one or more of the prism reference point, distance vision measurement point, and near vision measurement point. In addition, the spectral transmittance of the central region 15 may be the average value of multiple points within the region, including the fitting point.

[0080] Furthermore, the spectral transmittance of the peripheral region 16 can be measured by taking the spectral transmittance measurement at position P of the spectacle lens. As mentioned above, if the size of the light beam used for measurement is relatively large, the transmittance of the peripheral region 16 may be measured so that the center of the light beam is on the temple side of position P. In this case, it is desirable that the light beam passes through position P. Also, the spectral transmittance of the peripheral region 16 may be the average value of multiple points within the region, including position P.

[0081] There are no particular restrictions on the colors of the central region 15 and the peripheral region 16. The colors can also be selected according to the wearer's preference. For example, the central region 15 of the eyeglass lens 14 may be colored according to the wearer's preference, while the peripheral region 16 may be a less conspicuous color (for example, light gray). The central region 15 and the peripheral region 16 may be uniformly colored within their respective regions, or there may be a distribution within each region. Furthermore, the central region 15 and the peripheral region 16 may have a clear boundary, and the color may change in a gradient manner at the boundary between the central region 15 and the peripheral region 16.

[0082] The following provides a detailed explanation of eyeglass lenses.

[0083] <Lens Substrate> The lens substrate for eyeglass lenses may be plastic or glass. When coloring a plastic substrate, the coloring agent may be mixed in during the curing process of the plastic substrate. Similarly, with a glass substrate, the coloring agent may be mixed into the glass itself.

[0084] Examples of resins included in the plastic substrate used as the lens substrate include acrylic resin, thiourethane resin, methacrylic resin, allyl resin, episulfide resin, polycarbonate resin, polyurethane resin, polyester resin, polystyrene resin, polyethersulfone resin, polymethylpentene resin, diethylene glycol bisallyl carbonate resin, polyvinyl chloride resin, and sulfur-containing copolymers.

[0085] Furthermore, the refractive index of the plastic substrate at a wavelength of 546.1 nm is preferably in the range of 1.50 to 1.74.

[0086] <Dyeing> In this disclosure, the dyeing solution used for dyeing the plastic substrate preferably contains a dye, a surfactant, and a solvent (for example, water). Furthermore, one dyeing solution may contain one type of dye, i.e., one color dye, or it may be a mixed dyeing solution containing two or more types of dyes, i.e., two or more colors of dyes. That is, in dyeing the plastic substrate, multiple dyeing solutions of different colors may be used, or a mixed dyeing solution prepared by blending two or more colors of dyes may be used. The mixed dyeing solution may be prepared by mixing multiple dyeing solutions of different colors, or by blending multiple dyes in advance and using the blended dye.

[0087] Examples of dyes include disperse dyes, reactive dyes, direct dyes, complex dyes, acid dyes, metal complex dyes, vat dyes, sulfur dyes, fluorescent dyes, phosphorescent dyes, resin coloring dyes, and other functional dyes. Examples of dyes include yellow (Y) dyes, red (R) dyes, blue (B) dyes, brown dyes, violet dyes, orange dyes, and black dyes. From the viewpoint of minimizing the change in the color of eyeglass lenses due to light sources, it is preferable to use two or more types of dyes in combination rather than using only one type.

[0088] Examples of yellow dyes, red dyes, and blue dyes are given, for example, in Japanese Patent Publication No. 2024-004430.

[0089] The surfactant is not particularly limited as long as it can uniformly disperse the above dye in a solvent such as water. Examples of surfactants include ionic surfactants (e.g., anionic surfactants, cationic surfactants, etc.) and nonionic surfactants.

[0090] Examples of solvents include water and organic solvents. Examples of organic solvents include alcohol-based solvents, ketone-based solvents, ether-based solvents, ester-based solvents, hydrocarbon-based solvents, halogenated hydrocarbon-based solvents, amide-based solvents, sulfone-based solvents, and sulfoxide-based solvents.

[0091] The staining solution may contain various additives as needed, such as pH adjusters, viscosity adjusters, leveling agents, matting agents, stabilizers, UV absorbers, and antioxidants.

[0092] The amount of dye contained in the dyeing solution is preferably 0.001 to 10% by mass, and more preferably 0.01 to 5% by mass, relative to the total mass of the dyeing solution. Furthermore, the amount of surfactant contained in the dyeing solution is preferably 0.01 to 10% by mass, and more preferably 0.05 to 5% by mass, relative to the total mass of the dyeing solution.

[0093] Conventional methods such as coating, dipping, and sublimation staining can be used to stain the lens substrate. Alternatively, to stain only the peripheral region 16 or only the central region 15, the areas to be unstained may be masked before staining.

[0094] <Other Functional Films> Eyeglass lenses may include functional films. Functional films are films placed on lens substrates such as the plastic substrates mentioned above. Examples of functional films include polarizing films, photochromic films, primer films, hard coat films, interference films such as anti-reflective films, and water-repellent and oil-repellent films.

[0095] Furthermore, if the spectacle lens has various functional films placed on the lens substrate, the spectacle lens including the functional film satisfies at least one of the above requirements A to C, with respect to the central region 15 and the peripheral region 16.

[0096] <Procedure for manufacturing eyeglasses> Below, an example of the procedure for manufacturing eyeglasses according to this disclosure will be described as an example of staining the peripheral area.

[0097] First, the wearer selects the eyeglass frames they wish to purchase at the optician's. At that time, the optician measures the wearer's interpupillary distance (PD).

[0098] Next, the optician orders the eyeglass lenses from the lens manufacturer. At this time, they provide the lens manufacturer with information on the wearer's interpupillary distance (PD) and the bridge width (BW) of the eyeglass frame. The color and shape of the peripheral area are also specified at this time (either by selecting a lens product name or specifying options).

[0099] Meanwhile, the lens manufacturer calculates the distance L1 based on information from the optician. The lens manufacturer prepares untinted, unpolished spectacle lenses, dyes the peripheral areas based on the calculated distance L1, and then ships them to the optician.

[0100] Furthermore, opticians determine the pupil position relative to the vertical direction of the eyeglass frame. Generally, for single-vision lenses, the pupil position is set 2 mm below the center of the lens area (the opening of the lens holder) of the eyeglass frame. For progressive lenses, to be more accurate, the distance from the bottom of the eyeglass frame to the pupil is measured with a ruler or similar tool while the wearer is actually wearing the eyeglass frame.

[0101] Next, when the optician receives the dyed, un-ground spectacle lenses from the lens manufacturer, the optician cuts the outer shape of the spectacle lens to match the shape of the lens holder of the selected spectacle frame so that the fitting point of the spectacle lens is at the pupil position, and then inserts the cut spectacle lens into the spectacle frame (lens holder). Note that the cutting of the spectacle lens may be performed by the lens manufacturer. In that case, the optician provides the lens manufacturer with information on the vertical position of the pupil relative to the spectacle frame. Through the above steps, the spectacle according to this disclosure is manufactured.

[0102] [Second Embodiment] An example of the eyeglasses of the second embodiment of the present disclosure is the eyeglasses 50 shown in Figure 6.

[0103] In Figure 6, the eyeglasses 50 comprises an eyeglass frame 12 and two eyeglass lenses (a right-eye lens 52R and a left-eye lens 52L) attached to the eyeglass frame 12. The eyeglass frame 12 has the same configuration as the eyeglass frame 12 shown in Figure 1, so its description is omitted. In the following description, when it is not necessary to distinguish between the right-eye lens 52R and the left-eye lens 52L, they will also be referred to as eyeglass lenses 52.

[0104] In the eyeglasses 50 of this disclosure, for each of the two eyeglass lenses (right eye lens 52R and left eye lens 52L), if position P is a distance L1 from the fitting point in the direction parallel to line A connecting the fitting points of the two eyeglass lenses, and in the direction opposite to the bridge 12a side of the eyeglass frame 12, as determined by the following formula (1), then the contour line of the eyeglass lens passes through position P. Formula (1) L1 = (PD - BW) / 2

[0105] Note that PD represents the interpupillary distance of the wearer of glasses, and BW represents the bridge width of the eyeglass frame.

[0106] Specifically, as shown in Figure 6, the interpupillary distance PD is the distance between the pupil of the wearer's right eye Er and the pupil of their left eye El. The bridge width BW is the width of the bridge 12a of the eyeglass frame 12, and can also be defined as the shortest distance between the opening of the right rim 12b for mounting the right eye lens 14R and the opening of the left rim 12c for mounting the left eye lens 14L.

[0107] Distance L1 is the value obtained by subtracting the bridge width BW from the interpupillary distance PD and dividing by 2, as shown in equation (1) above. This distance L1 corresponds to the distance from the bridge 12a side end of the spectacle lens to the pupil (fitting point).

[0108] Since the positions of the eyes are not always symmetrical, if there is a difference between the left and right eyes, the distance L1 may be calculated using the above formula (1), and then the distance L1 may be corrected for the right and left eyes respectively to match the difference in pupil size, and the distance L1 for the right eye spectacle lens 52R and the distance L1 for the left eye spectacle lens 52L may be calculated and used.

[0109] Furthermore, as shown in Figure 6, line A is defined as the line connecting the fitting point of the right eye's spectacle lens 52R and the fitting point of the left eye's spectacle lens 52L. In Figure 6, the fitting points are shown to coincide with the position of the pupil.

[0110] On the line segment of line A, position P is defined as a position L1 away from the fitting point in the direction opposite to the bridge 12a. That is, for the right eye spectacle lens 52R, position P is a position L1 away from the fitting point toward the right temple 12d along line A, and for the left eye spectacle lens 52L, position P is a position L1 away from the fitting point toward the left temple 12e along line A.

[0111] Note that the distance between position P and the fitting point may deviate from the calculated distance L1 by an amount corresponding to the measurement error. Specifically, position P should be within a range of L1 ± 2 mm from the fitting point, more preferably within a range of L1 ± 1.5 mm, and even more preferably within a range of L1 ± 1 mm.

[0112] As shown in Figure 6, in the right eye eyeglass lens 52R, the contour line on the right temple 12d side passes through position P. Similarly, in the left eye eyeglass lens 52L, the contour line on the left temple 12e side passes through position P. Position P is located within the opening of the lens holding portion (rim) of the eyeglass frame 12.

[0113] Generally, eyeglass lenses are processed (cut) to match the shape of the lens-holding portion (rim) of the eyeglass frame 12. However, in the eyeglasses of this disclosure, some of the contour lines of the eyeglass lens 52 are processed to a shape different from the shape of the lens-holding portion (rim) so that the contour lines of the eyeglass lens 52 pass through position P.

[0114] More specifically, in the example shown in Figure 6, the upper, right (bridge 12a side), and lower contour lines of the right-eye spectacle lens 52R are substantially the same as the shape of the lens holder 12b. Therefore, the upper, right, and lower ends of the right-eye spectacle lens 52R are inserted into the lens holder 12b. On the other hand, the left (right temple 12d side) contour line of the right-eye spectacle lens 52R is different in shape from the lens holder 12b and passes through position P. Therefore, the lens holder 12b and a part of the right-eye spectacle lens 52R (the part of the contour line passing through position P) are separated, and a region without a lens (hereinafter also referred to as the cutting region 54R) is formed between the lens holder 12b and the right-eye spectacle lens 52R.

[0115] In the illustrated example, the contour line of the right eye spectacle lens 52R at the position in contact with the cutting area 54R is a curve that curves convexly toward the bridge 12a side.

[0116] Similarly, the upper, left (bridge 12a side), and lower contour lines of the left eye spectacle lens 52L in the figure are substantially the same as the shape of the lens holder 12c. Therefore, the upper, left, and lower ends of the left eye spectacle lens 52L are inserted into the lens holder 12c. On the other hand, the right (left temple 12e side) contour line of the left eye spectacle lens 52L in the figure differs from the shape of the lens holder 12c and passes through position P. Therefore, the lens holder 12c and a part of the left eye spectacle lens 52L (the part of the contour line passing through position P) are separated, and a region without a lens (hereinafter also referred to as the cutting region 54L) is formed between the lens holder 12c and the left eye spectacle lens 52L.

[0117] In the illustrated example, the contour line of the left eye spectacle lens 52L at the position in contact with the cutting area 54L is a curve that curves convexly toward the bridge 12a side.

[0118] As mentioned above, trial lenses are manufactured in a symmetrical circular shape, and the eye examination frame (eyeglass frame for eye examination) is selected to match the wearer's interpupillary distance (PD), so the wearer's pupil is always located at the geometric center of the trial lens. However, in the case of actually manufactured eyeglasses, the lens-holding part (rim) of the eyeglass frame has a variety of shapes, and the pupil is not necessarily located at the geometric center of the eyeglass lens (lens-holding part). In many cases, the lens-holding part (rim) has a shape that is long in the left-right direction, and the pupil is located on the nasal side (bridge side) of the geometric center of the eyeglass lens (lens-holding part), and the field of view is relatively wider on the temporal side (temple side) than the pupil. In that case, the edge of the eyeglass lens is used in the field of view on the temporal side (temple side) than the pupil, but the edge of the eyeglass lens has greater distortion than the central part. According to the inventor's research, in actually manufactured eyeglasses, such a distorted edge is used, so the wearer feels a difference in vision compared to when wearing the trial lens, and also experiences discomfort in their vision. Furthermore, we found that the field of vision on the temporal side (temple side) of the pupil is wider than the field of vision on the nasal side (bridge side) of the pupil. This imbalance between the left and right fields of vision through the spectacle lenses causes a difference in how things appear compared to when wearing optometric lenses, and also causes discomfort to the wearer.

[0119] In contrast, the eyeglasses of this disclosure have a shape in which the contour line of the eyeglass lens 52 passes through a position P determined based on the distance L1 obtained by the above formula (1). This reduces the influence of the field of view at the edges where distortion is large, and also reduces the left-right imbalance in the field of view seen through the eyeglass lens 52. As a result, the difference in how things look compared to when wearing optometric lenses can be reduced, and discomfort can be reduced.

[0120] In the example shown in Figure 6, the contour line of the spectacle lens 52 at the position in contact with the cutting area 54 is a curved line that curves convexly toward the bridge 12a side, but it is not limited to this. For example, the contour line of the spectacle lens 52 at the position in contact with the cutting area 54 may be a straight line along line B perpendicular to line A connecting the fitting points of the two spectacle lenses. Furthermore, the contour line may include straight and curved portions, or it may be a combination of straight lines with different angles.

[0121] The contour line of the spectacle lens 52 at the position in contact with the cutting area 54 is preferably located on the temple side (opposite side from the bridge 12a side) from line B, which is perpendicular to line A connecting the fitting points of the two spectacle lenses. In other words, the cutting area 54 is preferably located on the temple side (opposite side from the bridge 12a side) from line B. However, it is not limited to this, and a part of the contour line of the spectacle lens 52 at the position in contact with the cutting area 54 may be located on the bridge 12a side of line B. In other words, a part of the cutting area 54 may be located on the bridge 12a side of line B.

[0122] From the viewpoint of preventing the spectacle lens 52 from shifting or coming off the lens holder, it is preferable that the contour line of the spectacle lens 52 at the position in contact with the cutting area 54 is a convex line toward the bridge 12a.

[0123] Furthermore, there are no particular restrictions on the size of the cutting area 54.

[0124] Furthermore, in the example shown in Figure 6, one cutting region 54 is formed between each spectacle lens 52 and the lens holder, but the configuration is not limited to this, and two or more cutting regions may be formed.

[0125] In the second embodiment, the lens substrate of the spectacle lens is the same as in the first embodiment. The spectacle lens may also be dyed. Furthermore, as in the first embodiment, the spectacle lens may have a functional coating such as a hard coat film or an anti-reflective coating.

[0126] <Procedure for manufacturing eyeglasses according to the second embodiment> Below, an example of the procedure for manufacturing eyeglasses according to the second embodiment will be described.

[0127] First, the wearer selects the eyeglass frames they wish to purchase at the optician's. At that time, the optician measures the wearer's interpupillary distance (PD).

[0128] Next, the optician calculates the distance L1 based on the wearer's interpupillary distance (PD) and the bridge width (BW) of the eyeglass frame.

[0129] Furthermore, opticians determine the pupil position relative to the vertical direction of the eyeglass frame. Generally, for single-vision lenses, the pupil position is set 2 mm below the center of the lens area (the opening of the lens holder) of the eyeglass frame. For progressive lenses, to be more accurate, the distance from the bottom of the eyeglass frame to the pupil is measured with a ruler or similar tool while the wearer is actually wearing the eyeglass frame.

[0130] Next, the optician prepares the eyeglass lenses before grinding and cuts the outer shape of the lenses to match the shape of the lens holder of the selected eyeglass frame, so that the fitting point of the eyeglass lenses is at the pupil position, and also cuts the cutting area. Then, the optician inserts the cut eyeglass lenses into the eyeglass frame (lens holder). Note that the cutting of the eyeglass lenses may be performed by the lens manufacturer. In that case, the optician provides the lens manufacturer with information such as the wearer's interpupillary distance PD, the bridge width BW of the eyeglass frame, and the vertical position of the pupil relative to the eyeglass frame. Through the above steps, the eyeglasses of this disclosure are manufactured.

[0131] The eyeglasses of this disclosure will be described in more detail below with reference to examples and comparative examples, but these embodiments are not limited in any way.

[0132] (Preparation of eyeglasses with progressive lenses) Five subjects (wearers) who were unfamiliar with progressive eyeglasses (had not previously worn them regularly) were selected. The interpupillary distance (PD) of each of the five wearers was measured, and plastic progressive lenses (Nikon-Essilor, Lohas 10 Active, add power 1.25D, inset 2.6mm) were fitted into Boston-type eyeglass frames so that the fitting point was at the pupil position of each wearer, and evaluation eyeglasses were prepared for each wearer.

[0133] [Example 1] (Creation of a field of vision occlusion area) For each wearer, distance L1 was calculated from the interpupillary distance PD and the bridge width BW of the eyeglass frame. For the eyeglasses corresponding to each wearer, a position P was identified at a distance L1 away from the fitting point, parallel to line A and on the opposite side from the bridge, based on the calculated distance L1. For the five subjects, the distance L1 was between 20 and 25 mm.

[0134] A 15 mm wide opaque masking tape was applied to the peripheral area of ​​the temple side of the eyeglass lens on the side opposite to the wearer, from line B which passes through position P and is perpendicular to line A. The entire peripheral area from line B to the temple side was covered with the masking tape.

[0135] [Comparative Example 1] The procedure was the same as in Example 1, except that masking tape was applied to the area on the temple side from a line perpendicular to line A, passing through a position at a distance L1 + 4 mm away from the bridge side in a direction parallel to line A from the fitting point.

[0136] [Evaluation] Each subject was asked to wear the glasses of Example 1 and Comparative Example 1. In a room lit by white LED light, they observed various objects in the room and were asked whether they experienced any discomfort due to blurring or distortion of their vision. The evaluation was based on the number of subjects who were deemed to be able to wear the glasses. The evaluation results are shown in Table 1.

[0137]

[0138] The evaluation results showed that in the example, although each wearer experienced some discomfort due to visual distortion, all five wearers were able to wear the device. On the other hand, in the comparative example, the discomfort was severe, and three out of five wearers were unable to wear the device.

[0139] The effects of the present invention are clear from the results above.

[0140] 10a-10e Eyeglasses 12 Eyeglass frame 12a Bridge 12b Lens holder (right rim) 12c Lens holder (left rim) 12d Right temple 12e Left temple 14R Right eye eyeglass lens 14L Left eye eyeglass lens 15R, 15L Central area 16R, 16L Peripheral area 20 Microlens 50 Eyeglasses 52R Right eye eyeglass lens 52L Left eye eyeglass lens 54R, 54L Cutting area

Claims

1. Eyeglasses comprising an eyeglass frame and two eyeglass lenses attached to the eyeglass frame, wherein, in each of the two eyeglass lenses, along a direction parallel to line A connecting the respective fitting points of the two eyeglass lenses, a distance L1 from the fitting point toward the opposite side of the bridge of the eyeglass frame, determined by formula (1), passes through a line B perpendicular to line A, and the peripheral region opposite the bridge of the eyeglass frame has lower transmittance, a shorter focal length, or a color difference between the peripheral region and the central region than the central region including the fitting point. Formula (1) L1 = (PD - BW) / 2 PD represents the interpupillary distance of the wearer of the eyeglasses. BW represents the bridge width of the eyeglass frame.

2. The eyeglasses according to claim 1, wherein the central region includes a circular region with radius L1 from the fitting point.

3. The eyeglasses according to claim 1, wherein the central region is the region on the bridge side of the eyeglass frame than line B.

4. The eyeglasses according to claim 1, wherein the central region is symmetrical with respect to a straight line passing through the fitting point and parallel to line B.

5. The eyeglasses according to any one of claims 1 to 4, wherein the peripheral region is stained.

6. The eyeglasses according to any one of claims 1 to 4, wherein a light scattering structure is arranged in the peripheral region.

7. Eyeglasses comprising an eyeglass frame and two eyeglass lenses attached to the eyeglass frame, wherein, for each of the two eyeglass lenses, the contour line of the eyeglass lens passes through a position at a distance L1 from the fitting point toward the opposite side of the bridge of the eyeglass frame, as determined by equation (1), in a direction parallel to line A connecting the respective fitting points of the two eyeglass lenses. Equation (1) L1 = (PD - BW) / 2 PD represents the interpupillary distance of the wearer of the eyeglasses. BW represents the bridge width of the eyeglass frame.

8. The eyeglasses according to claim 7, wherein the contour line of the eyeglass lens and the eyeglass frame are spaced apart.

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