JP2010237402A - Progressive refractive power spectacle lens and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a progressive refractive power spectacle lens, suitably determining an inset amount of a near vision part even when a pantoscopic angle is different from a standard one, and obtaining a distinct vision range for a near vision fused by right and left eyes to achieve comfortable binocular vision. <P>SOLUTION: The progressive refractive power spectacle lens 1 includes a progressive part 13 continuously changing in refractive power, which is provided intermediate between a far vision part 11 and the near vision part 12. The inset amount H of the near vision part 12 is determined based on individual wearing status data of individual wearers and deflection of a visual line due to lens refraction. The individual wearing status data include information on the pantoscopic angle PA of the individual wearers. The inset amount H of the near vision part 12 is determined in consideration of the individual wearing state including the pantoscopic angle PA as well, so that it is possible to improve the problem of the conventional progressive refractive power spectacle lens 1 where distinct vision ranges for a near vision are not fused in the right and left eyes when the pantoscopic angle is different from the standard one. Thus, comfortable binocular vision can be achieved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a progressive-power spectacle lens having a near portion corresponding to near vision and a method for manufacturing the same.

  In general, as shown in FIG. 1, a progressive-power spectacle lens has a distance portion 11 for viewing a far object above the lens and a near portion 12 for viewing a near object below the lens. And a progressive portion 13 whose refractive power continuously changes between the distance portion 11 and the near portion 12 and other regions 14 and 15 called “side portions” or “peripheral portions”. Furthermore, a main gaze line 16 that passes through substantially the center of the lens 1 and penetrates the distance portion 11, the progressive portion 13, and the near portion 12 and is expected to have a high frequency of line-of-sight passage and a well-corrected aberration. Exists.

Usually, when the spectacle wearer looks near, the line of sight of both eyes is on the inside, so the main gazing line 16 is also displaced inward (to the nose side) from the distance portion 11 to the near portion 12. The horizontal distance between the main gaze line 16A in the distance portion 11 and the main gaze line 16B in the near portion 12 is an inset (INSET) amount H.
FIG. 2 shows a schematic plan view of the progressive-power spectacle lens wearing state.
In FIG. 2, the distance between the object O and the center of the outer surface of the lens 1 is the near object distance OD, the distance between the center of the outer surface of the lens 1 and the eyeball E is the eyeball rotation distance EP, and the interpupillary distance between the eyes E Is the inter-pupil distance PD. The line of sight is deviated inward (to the nose side), and an inset amount H is generated on the outer surface of the lens 1 between the main gaze line 16A in the distance portion and the main gaze line 16B in the near portion 12.

In progressive-power eyeglass lenses, the inset amount H is set to a constant value in the range of 2.5 to 3.0 mm regardless of the refractive power of the lens. However, the refractive power of the lens and the individual wearing situation of each wearer There is a conventional example (Patent Document 1) in which the inset amount H is changed based on data.
In the conventional example of this patent document 1, the distance power DF, the addition power ADD of the spectacle lens 1 and the near object distance OD, the distance between the distance pupils PD, and the eyeball rotation distance EP are considered as the individual wearing situation data. Thus, it is disclosed that the inset amount H is determined.
In addition, there is a conventional example (Patent Document 2) in which a progressive-power eyeglass lens is designed and manufactured in consideration of individual wearing situations including a forward tilt angle during wearing.

Japanese Patent Laid-Open No. 11-305173 JP 2001-356303 A

In patent document 1, in determining the amount of inset, the forward tilt angle during wearing is not taken into consideration. Patent Document 2 discloses a method for designing and manufacturing a progressive-power spectacle lens in consideration of individual wearing situations including a forward tilt angle during wearing, but the inset amount H is changed depending on the forward tilt angle during wearing of the lens. What to do is not considered.
Some spectacle frames are difficult to adjust due to the design and material, and the pre-inclination angle deviates significantly from the pre-inclination angle during wearing, deviating from the originally intended optical performance. Although the inconvenience of inappropriate optical performance occurs, the conventional examples shown in Patent Documents 1 and 2 cannot solve this inconvenience.

3 and 4 show the relationship between the aberration of the progressive-power spectacle lens and the field of view when the lens is worn.
FIG. 3A is a diagram schematically showing the aberration distribution on the lens. FIG. 3A shows the front of a pair of spectacle lenses on both the left and right sides for binocular use, and there is a region S with many aberrations shown as a hatched region at the side of each lens. When viewed through this region S, the image appears blurred.
In the spectacle lens 1 in which the inset amount H is appropriately set when an object in front is viewed with both eyes at a distance corresponding to the refractive power of each part of the progressive-power spectacle lens, FIG. As shown, the assumed main gaze line 16 and the trajectory 17 of the front line-of-sight passing point almost coincide with each other. At this time, the clear vision range for each eye (the range that can be clearly seen without blurring) is almost the same width on the nose side and the ear side with respect to the center of the visual field, as shown in FIG. D. FIG. 3C shows a state in which the left and right images in FIG. 3B are superimposed, and one image is viewed with both eyes. As shown in FIG. 3C, the clear vision ranges of the left and right eyes coincide and there is no visual field loss.

In the conventional progressive-power spectacle lens, even if it is a spectacle lens corresponding to the individual wearing state as disclosed in Patent Document 1, a standard value (for example, 10 °) is set for the forward tilt angle during wearing. ing.
However, even in such a spectacle lens, when the forward tilt angle during wearing is different from the standard, the front line of sight passes through a position deviated from the assumed main gaze line 16. When the forward tilt angle during wearing is small, the front line of sight passes more through the nose side (see FIG. 4A). If the forward tilt angle during wearing is large, the ear side passes more. As a result, the clear vision range for each eye when the forward tilt angle during wearing is smaller than the standard is biased toward the ear as shown in FIG. 4B. That is, the ear-side width D1 is larger than the nose-side width D2 with respect to the center of the visual field (D2 <D1). Therefore, as shown in FIG. 4C, there is a problem that the near vision range for the left and right eyes is shifted, and comfortable binocular vision is hindered.

  For example, the progressive power that the spherical power SPH of the lens is +4.00 diopter, the addition power ADD is 2.00 diopter, the refractive index N is 1.67, and the progressive zone length PL is 14 mm. An optimal inset is assumed when a spectacle lens is worn by a person with a distance-to-pupil distance PD of 63 mm and a vertex distance of 12 mm (eyeball rotation distance EP 25 mm), a near object distance OD 300 mm, and a forward tilt angle PA 10 ° during wearing. The quantity H is 3.11 mm. However, if the progressive-power spectacle lens designed in this way is worn at a forward tilt angle of 0 ° for wearing reasons due to inadequate frame fitting adjustment or design reasons, the line of sight is below the fitting point vertical. It will pass through the position on the nose side of 3.44 mm. If the near vision distance of this lens is 8 mm for each of the left and right eyes, the near vision width that can be comfortably viewed with both eyes is 7.67 mm, which is a loss of 4%. In addition, the distortion of the image peculiar to the progressive-power eyeglass lens also does not match with both eyes, which contributes to a sense of incongruity in spatial perception.

  The object of the present invention is to appropriately determine the inset amount of the near portion even when the forward tilt angle during wearing is different from the standard one, and to obtain a near vision range that is fused with the left and right eyes. It is an object of the present invention to provide a progressive-power spectacle lens that can be viewed visually and a method of manufacturing the same.

The progressive-power spectacle lens of the present invention includes a near portion corresponding to near vision, and is based on individual wear situation data of each wearer and gaze deflection due to lens refraction action. In the progressive-power spectacle lens in which the set amount is determined, the individual wearing state data includes information on the forward tilt angle of each individual wearer.
The method for manufacturing a progressive-power spectacle lens according to the present invention includes a near part corresponding to near vision, and the near part based on individual wear situation data of each wearer and gaze deflection caused by lens refraction In the method of manufacturing a progressive-power spectacle lens in which the amount of inset is determined, the individual wearing status data includes information on the forward tilt angle of each individual wearer.

  In the invention of this configuration, since the inset amount of the near portion is determined in consideration of the individual wearing state including the wearing front tilt angle, the conventional progressive-power spectacle lens is different from the standard wearing front tilt angle. In this case, the problem that the near vision range did not merge with the left and right eyes is improved, and comfortable binocular vision becomes possible.

Here, in the present invention, it is preferable that the inset amount is set to be a decreasing function with respect to the forward tilt angle during wearing.
In the invention of this configuration, the inset amount is set to be large when the forward tilt angle during wearing is small, and the inset amount is set to be small when the forward tilt angle during wearing is large, corresponding to the magnitude of the forward tilt angle during wearing. The amount of inset can be determined optimally.

The individual wearing status data preferably includes information on the near object distance of each wearing person.
In the invention of this configuration, the near object distance is an important element as the individual wearing situation data, and therefore a near vision range fused with the left and right eyes can be obtained.

The individual wearing status data preferably includes information on distances between distance pupils of individual wearers.
In the invention with this configuration, the distance between the distance pupils is an important element as the individual wearing status data, and therefore a near vision range fused with the left and right eyes can be obtained.

Further, in the method of manufacturing a progressive power spectacle lens, the inset amount is a ray tracing of a near line of sight under an individual wearing condition with respect to a progressive power spectacle lens having a desired refractive power and a standard inset amount. It is preferable to determine by this.
In the invention of this configuration, since the method of ray tracing the near line of sight is used in order to determine the inset amount, the inset amount can be accurately obtained.

Further, in the method for manufacturing a progressive power spectacle lens, the inset amount is preferably determined using an approximate expression based on desired refractive power and individual wear situation data of each wearer.
In the invention of this configuration, since the approximate expression is used to determine the inset amount, the inset amount can be easily obtained.

The schematic front view of a progressive-power eyeglass lens. FIG. 2 is a schematic plan view of a progressive power eyeglass lens wearing state. Schematic diagram showing the relationship between the aberration of the progressive power eyeglass lens and the field of view, and when the forward tilt angle is standard. Schematic diagram showing the relationship between the aberration of the progressive-power eyeglass lens and the field of view, and the forward tilt angle when worn is different from the standard. BRIEF DESCRIPTION OF THE DRAWINGS The progressive-power eyeglass lens concerning 1st Embodiment of this invention is shown, (A) is a schematic vertical side view, (B) is a schematic front view. The progressive-power eyeglass lens concerning 1st Embodiment is shown, (A) is a schematic vertical side view, (B) is a schematic front view. The progressive-power eyeglass lens concerning 1st Embodiment is shown, (A) is a schematic vertical side view, (B) is a schematic front view. (A)-(I) are the graphs which show the relationship between the wearing front inclination | tilt angle PA and the inset amount H in each Example. FIG. 3 is a schematic diagram illustrating the relationship between the aberration and the field of view of the progressive-power spectacle lens according to the first embodiment when the forward tilt angle during wearing is 0 °.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
5 to 7 show a schematic configuration of the progressive-power spectacle lens according to the present embodiment. FIG. 5A is a side view of the progressive-power spectacle lens, and FIG. 5B is a front view of the progressive-power spectacle lens.
In FIG. 5, the progressive-power spectacle lens 1 has the same basic configuration as the lens of FIG. 1, and includes a distance portion 11, a near portion 12, and a progression portion 13. Both sides of the progression portion 13 are "side" The regions 14 and 15 are called “parts” or “peripheral parts”. The main gaze line 16 exists almost through the center of the lens 1, and an inset amount H exists between the main gaze line 16 </ b> A in the distance portion 11 and the main gaze line 16 </ b> B in the near portion 12. .

In the spectacle lens 1 shown in FIG. 5, the forward tilt angle PA is set to 10 °, which is the standard. Here, the forward tilt angle PA is defined as the angle formed by the normal T of the outer surface in the cross-sectional view of the prism measurement reference point P and the horizontal plane including that point.
In FIG. 6, the progressive-power eyeglass lens 1 has the same basic configuration as the lens of FIG. 5, and the forward tilt angle PA and the inset amount H are different from the lens of FIG. In the progressive-power spectacle lens 1 shown in FIG. 6, the forward tilt angle PA is 0 ° when worn.
In FIG. 7, the progressive-power spectacle lens 1 has the same basic configuration as the lens of FIG. 5, and differs from the lens of FIG. 5 in the forward tilt angle PA and the inset amount H when worn. In the progressive-power spectacle lens 1 shown in FIG. 7, the forward tilt angle PA is 20 ° when worn.
In the progressive-power spectacle lens 1 shown in these figures, the inset amount H is determined based on individual wear situation data of individual wearers and the deflection of the line of sight due to the lens refraction action.
The individual wearing state data includes the forward tilt angle PA, the near object distance OD, the distance between pupils PD for distance, and the eyeball rotation distance EP of each wearer.

A method for manufacturing the progressive-power spectacle lens 1 according to the present embodiment will be described.
First, the distance power DF and the addition power ADD corresponding to the wearer are input. Furthermore, if there is designation of prism refractive power or the like, it is inputted. Next, the near object distance OD and the distance between the distance pupils PD of the wearer are input from the individual wear situation data of the wearer. The eyeball rotation distance EP and the pre-wear inclination angle PA in the wearing state can be additionally inputted.
After that, based on the input information, a ray tracing simulation is performed with a spectacle lens designed in advance assuming a standard wearing state in which the pre-tilt angle PA is 10 °, and the optimal inset amount H To decide. Further, the passing position of the near line of sight when the spectacle lens is worn at the front tilt angle PA of 0 ° and 20 ° when worn is obtained by real ray tracing. Thus, the inset amount H is determined when the forward tilt angle PA is between 0 ° and 20 °.

  Next, an appropriate one according to the specification is selected from a plurality of types of semi-finished lenses prepared in advance. In the combination with the completed surface of the selected semi-finished lens, the unprocessed surface side is designed so that the inset amount H determined in the above step is obtained. In that case, the optical performance can be optimized in consideration of the assumed near object distance OD, the amount of prism thinning according to the lens diameter and the target lens shape, the center thickness, and the like. A so-called free-form surface machining technique can be used in which NC data is created from the shape of the designed unmachined surface and the material is directly machined by driving an ultra-precision 3D NC cutting machine.

  Accordingly, in the first embodiment, (1) a distance portion 11 for viewing a far object, a near portion 12 for viewing a near object, and a distance between the distance portion 11 and the near portion 12 are continuous. In the progressive-power spectacle lens 1 provided with a progressive portion 13 that changes its refractive power, the inset amount of the near portion 12 based on individual wear situation data of individual wearers and the deflection of the line of sight due to the lens refraction action H is determined. The individual wearing status data includes information on the forward tilt angle PA of each individual wearer. Therefore, since the inset amount H of the near portion 12 is determined in consideration of the individual wearing state including the wearing front tilt angle PA, in the conventional progressive power lens 1, what is the standard wearing front tilt angle? When different, the problem that the near vision range did not merge with the left and right eyes is improved, and comfortable binocular vision becomes possible.

  In the first embodiment, (2) the inset amount H is determined by ray tracing the near line of sight under the individual wearing situation, so that the inset amount H is obtained accurately and individually. Can do. Therefore, the near vision range fused with the left and right eyes is obtained, and more comfortable binocular vision is possible.

Next, examples will be described in order to confirm the effects of the first embodiment.
[Example 1]
The specifications of Example 1 are shown in Table 1.

In Example 1, a progressive-power spectacle lens with a distance portion spherical refractive power SPH of +4.00 diopters, an addition refractive power ADD of 2.00 diopters, a refractive index N of 1.67, and a progressive zone length PL of 14 mm, Assuming that a person with a distance-to-pupil distance PD of 63 mm is worn at an apex distance of 12 mm (eyeball rotation distance EP25 mm), a near object distance OD300 mm, and a forward tilt angle PA10 of wearing, the optimum inset amount H is 3 .11 mm.
When this lens is worn at a pretilt angle PA of 0 ° and 20 °, the passing position of the near line of sight is obtained by tracing the actual ray, and the results are 3.44 mm and 2.85 mm below the fitting point vertical, respectively. there were.
Therefore, when the progressive surface is individually designed, the inset amount H is 3.44 mm (when the forward tilt angle PA is 0 °), 3.11 mm (when the forward tilt angle PA is 10 °), 2 What is necessary is just to design so that it may be set to 85 mm (when the forward tilt angle PA = 20 ° during wearing). The relationship between the forward tilt angle PA and the inset amount H is shown in FIG. As shown in FIG. 8 (A), it can be seen that the forward tilt angle PA and the inset amount H are set to be a decreasing function.
In the first embodiment, the near vision range for the left and right eyes can be matched even when the forward tilt angle PA is 0 °, 10 °, or 20 °.

  FIG. 9 is a diagram showing the coincidence of the near vision range when the forward tilt angle PA is 0 °. FIG. 9A schematically shows the aberration distribution on the lens. FIG. 9A shows the front of a pair of spectacle lenses on both the left and right sides for both eyes, and there is a region S with much aberration at the side of each lens. Since an inset amount H is set when an object in front is viewed with both eyes at a distance corresponding to the refractive power of each part of the progressive-power eyeglass lens 1, as shown in FIG. The main gaze line 16 thus made and the locus 17 of the front line-of-sight passage point substantially coincide. At this time, the clear vision range for each eye has substantially the same width D on the nose side and the ear side with respect to the center of the visual field, as shown in FIG. 9B. In FIG. 9C showing a state where one image is viewed with both eyes, it can be seen that the clear vision ranges of the left and right eyes coincide with each other and there is no visual field loss.

[Example 2]
The specifications of Example 2 are shown in Table 2.

Example 2 is the same as Example 1 except that the near object distance OD is 200 mm.
By setting the inset amount H as shown in the right end of Table 2, the near vision range for the left and right eyes can be made to coincide even when the forward tilt angle PA is 0 °, 10 °, or 20 °. did it. In Example 2, the relationship between the forward tilt angle PA and the inset amount H is shown in FIG. As shown in FIG. 8B, it can be seen that the forward tilt angle PA and the inset amount H are set to be a decreasing function.

[Example 3]
The specifications of Example 3 are shown in Table 3.

The third embodiment is the same as the first embodiment except that the distance pupil distance PD is 68 mm.
By setting the inset amount H as shown in the right end of Table 3, the near vision range for the left and right eyes can be made consistent when the forward tilt angle PA is 0 °, 10 °, or 20 °. did it. In Example 3, a relationship between the forward tilt angle PA and the inset amount H is shown in FIG. As shown in FIG. 8C, it can be seen that the forward tilt angle PA and the inset amount H are set so as to be a decreasing function.

[Example 4]
The specifications of Example 4 are shown in Table 4.

  In Example 4, a progressive-power spectacle lens in which the distance portion spherical refractive power SPH is −4.00 diopter, the addition refractive power ADD is 2.00 diopter, the refractive index N is 1.67, and the progressive zone length PL is 14 mm. Assuming that a person with a distance PD distance of 63 mm wears at a vertex distance of 12 mm (eye rotation distance EP25 mm), a near object distance OD 300 mm, and a forward tilt angle PA 0 °, 10 °, 20 ° during wearing, As shown at the right end of FIG. 4, the inset amount H is 2.66 mm (when the forward tilt angle PA = 0 ° when worn), 2.47 mm (when the forward tilt angle PA is 10 °) 2.39 mm (wear) By setting the forward tilt angle PA = 20 °), the near vision range for the left and right eyes could be matched when the forward tilt angle PA was 0 °, 10 °, or 20 °. . In the fourth embodiment, the relationship between the forward tilt angle PA and the inset amount H is shown in FIG. As shown in FIG. 8D, it can be seen that the forward tilt angle PA and the inset amount H are set to be a decreasing function.

[Example 5]
Specifications of Example 5 are shown in Table 5.

Example 5 is the same as Example 4 except that the near object distance OD is 200 mm.
By setting the inset amount H as shown at the right end of Table 5, the near vision range for the left and right eyes can be made consistent when the forward tilt angle PA is 0 °, 10 °, or 20 °. did it. In the fifth embodiment, the relationship between the forward tilt angle PA and the inset amount H is shown in FIG. As shown in FIG. 8 (E), it can be seen that the forward tilt angle PA and the inset amount H are set to be a decreasing function.

[Example 6]
The specifications of Example 6 are shown in Table 6.

The sixth embodiment is the same as the fourth embodiment except that the distance pupil distance PD is 68 mm.
By setting the inset amount H as shown in the right end of Table 6, the near vision range for the left and right eyes can be made to coincide even when the forward tilt angle PA is 0 °, 10 °, or 20 °. did it. In Example 6, the relationship between the forward tilt angle PA and the inset amount H is shown in FIG. As shown in FIG. 8 (F), it can be seen that the forward tilt angle PA and the inset amount H are set to be a decreasing function.

Next, a second embodiment of the present invention will be described.
In the second embodiment, in order to determine the inset amount, an approximate expression is used based on the desired refractive power and individual wearer's individual wear situation data, and other configurations are the same as those of the first embodiment. The same.
The distance power of the lens is DF (diopter), the addition power is ADD (diopter), the near object distance is OD (mm), the eyeball rotation distance is EP (mm), and the distance between the distance pupils is PD (mm). The optimum inset amount H (mm) is approximately obtained by the following equation (1).
H = EP × PD / 2 × {EP + OD−EP × OD × (DF + ADD) / 1000}
...... (1)

Equation (1) is derived from paraxial ray tracing using a spectacle lens as a thin lens. For lenses with positive refractive power that are actually thick, the error between the approximate expression and the result obtained by tracking the actual ray becomes large, but the optimum inset amount H and the standard in the assumed standard wearing state The difference from the optimum inset amount H ′ in the non-existing state is not so different between the one using the approximate expression and the one using the real ray tracing. When each amount of the assumed standard wearing state is OD ⁰ , EP ⁰ , PD ⁰ , the inset change amount ΔH by the approximate expression is obtained by the following expression (2).
ΔH = EP × PD / 2 × {EP + OD-EP × OD × (DF + ADD) / 1000} -EP 0 × PD 0/2 × {EP 0 + OD 0 -EP 0 × OD 0 × (DF + ADD) / 1000} ...... (2)

The change amount ΔH obtained by the equation (2) can be set as an inset change amount from a standard design lens designed in advance by real ray tracing. Expression (2) is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 11-305173), but this expression does not include the forward tilt angle PA when used as a parameter.
In the second embodiment of the present invention, the wearing front tilt angle is PA (°), and when the wearing front tilt angle PA deviates from the wearing front tilt angle PA ⁰ in the standard wearing state, Focusing on the change in the distance to the eye, the progressive zone length is PL (mm), and the eyeball rotation distance EP is replaced by the following equation (3).
EP ′ = EP−PL × (PA−PA ⁰ ) * π / 180 (3)
Then, the inset change amount ΔH is obtained by Expression (4).
ΔH = EP '× PD / 2 × {EP' + OD-EP '× OD × (DF + ADD) / 1000} -EP 0 × PD 0/2 × {EP 0 + OD 0 -EP 0 × OD 0 × (DF + ADD) / 1000}
(4)

Further, the optimum inset amount H in the standard wearing state is not obtained by actual ray tracing each time, but is approximated by a polynomial of a distance power DF from some sample design in advance, for example, a progressive zone length of 14 mm In this case, the equation (5) is used.
H ⁰ = 2.7699 + 0.080196 × DF + 0.0014418 × DF × DF
...... (5)
Finally, the optimum inset amount by the approximate expression is obtained by Expression (6).
H = H ⁰ + ΔH (6)

Therefore, in 2nd Embodiment, there can exist the following effect other than the same effect as (1) of 1st Embodiment.
(3) The inset amount H was determined using an approximate expression based on the desired refractive power and individual wear situation data of individual wearers. Therefore, it is possible to simplify the actual ray tracing process using the standard lens, and to improve the design and manufacturing efficiency.

Next, examples will be described in order to confirm the effects of the second embodiment.
[Example 7]
The specifications of Example 7 are shown in Table 7.

In Example 7, a progressive-power spectacle lens having a distance spherical power SPH of 0.00 diopter, an addition power ADD of 2.00 diopter, a refractive index N of 1.67, and a progressive zone length PL of 14 mm, Assume that a person with a distance pupil distance PD of 63 mm wears at a vertex distance of 15 mm (eyeball rotation distance EP 28 mm), a near object distance OD 300 mm, and a forward tilt angle PA of 0 °, 10 °, and 20 ° when worn. As shown at the right end of Table 7, using an approximate expression, the inset amount H is 3.30 mm (when the forward tilt angle PA is 0 °), 3.06 mm (when the forward tilt angle PA is 10 °), 2.82 mm (when the forward tilt angle PA = 20 ° during wearing) was obtained. This value is a sufficiently good approximation for practical use with respect to the values of 3.25 mm, 3.00 mm, and 2.83 mm obtained by real ray tracing. In Example 7, the relationship between the forward tilt angle PA and the inset amount H is shown in FIG. As shown in FIG. 8G, it can be seen that the forward tilt angle PA and the inset amount H are set so as to be a decreasing function.
By using the approximate expression, the process of tracing the actual ray by the standard lens can be simplified, and the design and manufacturing efficiency is improved. Furthermore, the near vision range for the left and right eyes could be substantially matched when the forward tilt angle PA was 0 °, 10 °, or 20 °.

[Example 8]
The specifications of Example 8 are shown in Table 8.

In Example 8, a progressive-power spectacle lens in which the distance portion spherical refractive power SPH is −6.00 diopter, the addition refractive power ADD is 2.00 diopter, the refractive index N is 1.67, and the progressive zone length PL is 14 mm. Suppose a person with a distance PD distance of 68 mm wears the apex distance 12 mm (eyeball rotation distance EP 25 mm), the near object distance OD 300 mm, and the forward tilt angle PA is 0 °, 10 °, 20 °. As shown in the right end of Table 8, using an approximate expression, the inset amount H is 2.71 mm (when the forward tilt angle PA is 0 °), 2.52 mm (when the forward tilt angle PA is 10 °) ) 2.32 mm (when the forward tilt angle PA = 20 ° during wearing) was obtained. This value is a sufficiently good approximation for practical use with respect to the values of 2.71 mm, 2.53 mm, and 2.46 mm according to real ray tracing. In the eighth embodiment, the relationship between the forward tilt angle PA and the inset amount H is shown in FIG. As shown in FIG. 8H, it can be seen that the forward tilt angle PA and the inset amount H are set so as to be a decreasing function.
By using the approximate expression, the process of tracing the actual ray by the standard lens can be simplified, and the design / manufacturing efficiency is improved. Furthermore, the near vision range for the left and right eyes could be substantially matched when the forward tilt angle PA was 0 °, 10 °, or 20 °.

[Example 9]
The specifications of Example 9 are shown in Table 9.

In Example 9, a progressive-power spectacle lens having a distance spherical power SPH of +2.00 diopters, an addition power ADD of 3.00 diopters, a refractive index N of 1.67, and a progressive zone length PL of 14 mm is used. Suppose that a person with a distance between pupils PD of 63 mm is worn at a vertex distance of 12 mm (eyeball rotation distance EP25 mm), a near object distance OD 300 mm, and a forward tilt angle PA of 0 °, 10 °, and 20 °. As shown in the right end of Table 8, using an approximate expression, the inset amount H is 3.29 mm (when the forward tilt angle PA is 0 °), 3.01 mm (when the forward tilt angle PA is 10 °) ) 2.73 mm (when the forward tilt angle PA = 20 ° during wearing) was obtained. This value is a sufficiently good approximation for practical use with respect to the values of 3.27 mm, 2.97 mm, and 2.74 mm obtained by real ray tracing. In Example 9, the relationship between the forward tilt angle PA and the inset amount H is shown in FIG. As shown in FIG. 8 (I), it can be seen that the forward tilt angle PA and the inset amount H are set to be a decreasing function.
By using the approximate expression, the process of tracing the actual ray by the standard lens can be simplified, and the design / manufacturing efficiency is improved. Furthermore, the near vision range for the left and right eyes could be substantially matched when the forward tilt angle PA was 0 °, 10 °, or 20 °.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the above embodiments, the standard pantoscopic angle PA ^o and 10 °, has been described actually results when the pantoscopic angle PA of the wear the lens to the 0 ° and 20 °, in the present invention, standard pantoscopic angle PA of the pantoscopic angle PA ^o and actually worn by the lens is not limited to these angles.

  The present invention can be used for progressive-power spectacle lenses.

  DESCRIPTION OF SYMBOLS 1 ... Progressive-power eyeglass lens, 11 ... Distance part, 12 ... Near part, 13 ... Progressive part, 16 ... Main gaze, PA ... Front tilt angle at the time of wearing, H ... Inset amount

Claims (10)

Progressive power glasses having a near portion corresponding to near vision and in which the amount of inset of the near portion is determined based on individual wear situation data of each wearer and gaze deflection due to lens refraction action In the lens,
The progressive-power spectacle lens, wherein the individual wearing status data includes information on a forward tilt angle of each individual wearer. The progressive-power eyeglass lens according to claim 1,
The progressive-power spectacle lens according to claim 1, wherein the inset amount is set to be a decreasing function with respect to the forward tilt angle during wearing. In the progressive-power spectacle lens according to claim 1 or 2,
The progressive-power spectacle lens, wherein the individual wearing status data includes information on a near object distance of each wearer. In the progressive-power spectacle lens according to claim 1 or 2,
The progressive-power spectacle lens characterized in that the individual wearing status data includes information on distances between pupils of distances of individual wearers. A progressive power eyeglass lens having a near portion corresponding to near vision and in which the amount of inset of the near portion is determined based on individual wear situation data of each wearer and gaze deflection due to lens refraction action In the manufacturing method of
The method for manufacturing a progressive-power spectacle lens, wherein the individual wearing state data includes information on a forward tilt angle of each individual wearer. In the manufacturing method of the progressive-power eyeglass lens according to claim 5,
The method for manufacturing a progressive-power spectacle lens, wherein the inset amount is set to be a decreasing function with respect to the forward tilt angle during wearing. In the manufacturing method of the progressive-power spectacles lens according to claim 5 or 6,
The method of manufacturing a progressive-power spectacle lens, wherein the individual wearing status data includes information on a near object distance of each wearer. In the manufacturing method of the progressive-power spectacles lens according to claim 5 or 6,
The method for manufacturing a progressive-power spectacle lens, wherein the individual wearing status data includes information on distances between pupils for a distance of each wearer. In the manufacturing method of the progressive-power eyeglass lens according to any one of claims 5 to 8,
The inset amount is determined by ray tracing a near line of sight under individual wearing conditions with respect to a progressive power lens having a desired refractive power and a standard inset amount. A method of manufacturing a spectacle lens. In the manufacturing method of the progressive-power eyeglass lens according to any one of claims 5 to 8,
The method of manufacturing a progressive-power spectacle lens, wherein the inset amount is determined using an approximate expression based on desired refractive power and individual wear situation data of each wearer.

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