JP6458262B2 - Design method and manufacturing method for eyeglass lens - Google Patents

Description

  The present invention relates to a spectacle lens design method and manufacturing method.

Human visual information is input to the retinas of the two left and right eyeballs, and is integrated into one in the brain. In addition, humans are known to have dominant eyes (or “professional eyes”) in either the left or right eye, as well as the dominant hand in either left or right hand, and information input to the two left and right eyeballs in general. It is considered that the information of the dominant eye is important when these are integrated into one.
For example, in determining the lens power of a spectacle lens, when determining the left and right powers, there may be a prescription that makes it easier to see the dominant eye in consideration of information on the dominant eye. That is, in order to improve the appearance seen through the spectacle lens, it is considered to be effective to design a spectacle lens that reflects the information of the dominant eye on the spectacle lens design.
Patent document 1 is shown as a prior art regarding the design which considered such a dominant eye. In Patent Document 1, when the prescription including the frequency is a predetermined difference (for example, 1.0D or more) on the left and right sides of the pair of left and right spectacle lenses, the first surface of the left and right lenses is based on information on the dominant eye (interest). And changing the curve of the second surface.

Japanese Patent No. 4726791

  However, since the above Patent Document 1 is a method of changing the curve according to the information of the dominant eye, the invention is different only in the case where the power of the left and right eyes is not less than a predetermined value (for example, 1D), that is, the base curves of the left and right lenses are different. It is applicable only when there is a problem that it is not general. Further, in the above-mentioned Patent Document 1, it is said that the performance of any one of astigmatism, field curvature, and distortion should be within an allowable range with the left and right lenses. The balance is not disclosed. In particular, astigmatism and curvature of field are in a trade-off relationship where either one increases or the other increases, so if one of the aberrations is controlled considering the dominant eye, the other aberration is expected. The possibility of worsening to the outside cannot be excluded, and there is a possibility that the appearance will be worse than when the dominant eye is not considered.

Here, the formation (shape) of the spectacle lens is considered. The spectacle lens is located at a certain distance (lens thickness) apart from the front and back surfaces. Each of the front surface and the back surface has a configuration in which an aspherical element (aspherical surface sag) and a progressive surface element (progressive sag) are combined with a spherical curve shape that is generally a base. A spherical lens is a state in which both aspherical elements and progressive surface elements are zero on both the front and back surfaces. An aspheric element is generally constituted by a relatively simple expression (such as an aspheric design expression), and the surface shape can be controlled by determining an aspheric coefficient or the like. The progressive surface element is generally used for forming a surface of a progressive power lens, and forms a free-form surface using spline interpolation or the like. Here, how to design the aspherical element and / or the progressive surface element in consideration of the information of the dominant eye has not been clarified in the prior art. Patent Document 1 relates to a spherical curve serving as a base. In general, in lens design, the lens shape is calculated so that a certain point of optical aberration on the lens becomes a certain target value, but the design of progressive surface elements is more free than the design of aspherical elements. The calculation cost is much higher. Designing aspherical elements is particularly desirable from the viewpoint of reducing industrial calculation costs, such as when designing a subtle look for an individual case after designing an eyeglass lens from a lens manufacturer. It is not clear how to consider the information of the dominant eye.
The present invention has been made paying attention to such problems existing in the prior art. The purpose is suitable for viewing with both eyes by improving the balance of astigmatism and field curvature in consideration of dominant eye information when designing eyeglass lenses in consideration of dominant eyes. It is an object to provide a design method and a processing method for a spectacle lens capable of obtaining a clear field of view.

In order to solve the above-mentioned problem, as a first means, there is a design method for a pair of left and right eyeglass lenses reflecting dominant eye information, and the left or right side of the wearer is determined as to either the left or right side of the wearer. It was designed to have astigmatism less than the lens on the non-dominant eye side.
With such a configuration, a spectacle lens capable of obtaining a suitable field of view when viewed with both eyes even if the field curvature, which is a trade-off relationship with astigmatism, increases on the dominant eye side. It can be manufactured. Here, “reducing astigmatism” means reducing the absolute value of astigmatism, and does not simply mean that the numerical value of astigmatism is small, that is, negative. The dominant eye information is information relating to the dominant eye of the wearer, and is information such as whether the dominant eye is the right eye or the left eye or whether the right eye and the left eye are equal without eye superiority. In addition, it is known that there are a person who has a great eye advantage and a person who is not so big with the right and left eyes depending on the wearer, that is, the eye advantage is strong and weak. The information preferably includes information on the strength of eye superiority. For example, in some wearers, the dominant eye is the right eye, but the information is recognized by 70% of the right eye and 30% of the left eye.
Further, in addition to the first means as the second means, the curvature of field of the aspheric lens on the dominant eye side and the non-dominant eye side is designed so that either one is worse than the other. did.
With such a configuration, the field curvature, which is a trade-off relationship with astigmatism, is not deteriorated in both eyes (that is, astigmatism is improved in both eyes), and when viewed with both eyes. It is possible to manufacture a spectacle lens capable of obtaining a suitable field of view.

Further, as a third means, a design method for a pair of left and right eyeglass lenses reflecting dominant eye information, which is designed to design left and right lenses that do not reflect dominant eye information having predetermined astigmatism and curvature of field. In contrast, the lens on the dominant eye side of the wearer is designed to reduce astigmatism and increase field curvature.
With such a configuration, the left and right lenses do not reflect dominant eye information when viewed with both eyes, even if the curvature of field, which has a trade-off relationship with astigmatism, increases on the dominant eye side. Compared to this, it is possible to manufacture a spectacle lens capable of obtaining a suitable field of view. “Left and right lens design that does not reflect superior eye information” is a design that is the base before reflecting the dominant eye information, or a design in which there is no difference in the eye superiority of the left and right eyes. The lens power and aberration may be the same or different according to the user's prescription. The design in the case where there is no difference in the eye superiority between the left and right eyes is preferably the same as the base design before reflecting the preferential eye information. Here, “reducing astigmatism and increasing field curvature” means reducing the absolute value of astigmatism and increasing the absolute value of field curvature. The same shall apply to the description relating to the large and small aberrations in the following claims.
Further, in addition to the third means as the fourth means, the astigmatic difference is expressed more than the curvature of field in the design of the left and right lenses that do not reflect the dominant eye information.
In other words, the design of the left and right lenses that do not reflect the dominant eye information is designed to reduce the field curvature in terms of astigmatism and field curvature, which are in a trade-off relationship. For this reason, in the design that does not reflect the dominant eye information, the aberration (blurring) derived from the astigmatic difference becomes strong, but the lens on the dominant eye side is designed to reduce the astigmatic difference and increase the field curvature. This will improve the overall blur. Here, “the astigmatism difference is greater than the curvature of field” means that the absolute value of the astigmatism difference is greater than the absolute value of the curvature of field. The astigmatic difference is the difference between the image formation state (meridional power) of the light beam in the meridional direction around the principal ray incident on the lens and the image formation state (sagittal power) of the light beam in the sagittal direction. The value is half of the astigmatic difference.
When processing a specific lens, it is not necessary to design a base for each lens in advance. If data corrected once based on the base design is acquired, and thereafter processing is performed according to the data, each lens can be interpreted as an improved design with respect to the base design.

Further, as a fifth means, a method for designing a pair of left and right eyeglass lenses reflecting dominant eye information,
Compared to the design of the left and right lenses that do not reflect the dominant eye information with the predetermined astigmatism and field curvature, the astigmatism is increased for the lens on the left or right side of the wearer to reduce the curvature of field. Designed to be designed to do.
With such a configuration, even if astigmatism that has a trade-off relationship with curvature of field increases on the dominant eye side, it is preferable compared to a design that does not reflect dominant eye information when viewed with both eyes. It is possible to manufacture a spectacle lens capable of obtaining a field of view.
Further, in addition to the fifth means as the sixth means, in the design of the left and right lenses that do not reflect the dominant eye information, the field curvature is expressed more than the astigmatic difference.
In other words, the design that does not reflect the dominant eye information is designed to reduce the astigmatism that is a trade-off relationship and the astigmatism in the field curvature. Therefore, in such a design that does not reflect the dominant eye information, aberration (blurring) derived from curvature of field is strong, but the lens that is non-dominant eye is designed to reduce the curvature of field and increase the astigmatic difference. This will improve the overall blur. Here, “the field curvature is greater than the astigmatic difference” means that the absolute value of the field curvature is larger than the absolute value of the astigmatic difference.

  Further, as a seventh means, a design method for a pair of left and right eyeglass lenses reflecting dominant eye information, which does not reflect the dominant eye information of left and right lenses having predetermined astigmatism and field curvature. When the lens is designed to be modified in consideration of the wearer's right or left dominant eye, the following formulas (1), (3), and (4) are used for a negative power lens, and (2) (3) for a plus lens: It is preferable to set astigmatism and field curvature aberration so as to satisfy the expression (4).

According to the seventh means, in the case of a correction design with respect to a design that does not reflect the dominant eye information, if the lens has a minus power, the plus power so as to fall within the formulas (1), (3), and (4) If the lens is designed so as to fall within the formulas (2), (3), and (4), a spectacle lens capable of obtaining a suitable field of view in consideration of the dominant eye can be manufactured.
The reason why the inequality sign is different between the minus power lens and the plus power lens is that the tendency of astigmatism and field curvature aberration is different between the minus power lens and the plus power lens. For example, in an aspheric lens designed with zero astigmatism, a positive curvature of field occurs at a minus power, but a negative curvature of field occurs at a plus power.
Since field curvature has a trade-off relationship with astigmatism, the expressions (1) and (2) can be set from the viewpoint of astigmatism. In that case, (1) and (2) in the above equation 1 can be set as (5) and (6) in the following equation 2. Although the following formula 2 is described with astigmatism, the same formula can be applied even if an astigmatism difference that is twice astigmatism is used for A1, B1, C1, and D1.

Further, as an eighth means, in addition to any of the third to seventh means, the left and right lenses that do not reflect the dominant eye information are designed for only one of the left and right lenses. .
By doing so, it is possible to reflect the dominant eye information while maintaining the appearance of the base design with one eye and obtain a suitable field of view with both eyes. In addition, the design work is reduced because an additional design is required for the base design on only one side.
Further, as a ninth means, the eyeglass lens design method according to any one of claims 1 to 8 is designed by including the design data of the aspherical element in the design data of the lens surface element.
By designing the aspherical element in this way, it is possible to easily adjust astigmatism and curvature of field for the entire lens surface. Here, the design data of the lens surface element defines the three-dimensional shape of the lens surface, and includes, for example, a sag value, a curvature, a curvature change, a direction of the curvature change at each position of the lens. In addition, “the design data of the aspherical element is included in the design data of the lens surface element” means that the shape of the spherical curve (spherical element) and the aspherical element that is the base even if the design data of the lens surface element is small (Aspherical surface sag) design data.
As tenth means, the design data for designing a spectacle lens according to any one of claims 1 to 9 includes progressive surface design data for designing a progressive power lens. By doing this, it is possible to balance astigmatism and curvature of field for design data including design data of progressive surface elements in consideration of dominant eye information, which is suitable when viewing with both eyes. A progressive power lens capable of obtaining a field of view can be provided. The progressive surface element design data is preferably combined with the lens design surface in which the aspherical design data is combined with the base spherical surface.
Further, as an eleventh means, a spectacle lens is manufactured by processing a lens surface based on design data acquired by any one of the first to tenth spectacle lens design methods.
As a result, a spectacle lens having a lens surface processed based on design data that specifically reflects the information of the dominant eye can be manufactured.

In each of the above means, astigmatism and field curvature setting conditions are determined for the dominant eye side and the non-dominant eye based on the following theory.
First, consider eye superiority.
Eye superiority is not treated equally when the information input to the left and right eyes is integrated in the brain, but the information input to the eye with superior eye (dominant eye) is “main”. Information that is recognized by the brain.
On the other hand, astigmatism and curvature of field are factors that degrade the quality of the appearance of light rays input to the eye through the spectacle lens. Astigmatism and field curvature are in a trade-off relationship when a certain lens is designed, so if you do not consider eye superiority in conventional design, do you focus on astigmatism or field curvature? In other words, it is only whether the astigmatism or the curvature of field is good. However, even with the same amount of deterioration factors (that is, the same amount of aberration), it is better than the conventional design by appropriately inputting information in consideration of the eye superiority characteristics of dominant and non-dominant eyes. The gist of the present invention is that it can be expected to be visible.
Since information input from both eyes is integrated in the visual cortex of the brain, it is possible to measure how the information input to both eyes looks in the brain as one piece of information. . Therefore, the inventors loaded the astigmatic difference (twice astigmatism) and curvature of field with the load lens for each of the dominant eye and the non-dominant eye and both the dominant eye and the non-dominant eye, Assuming that the case of no binocular load is 100%, an examination was made as to how much the appearance deteriorates under each load condition. In preparing the graph, we obtained statistically sufficient number of subject data. The results are shown in Table 1. In the experiment, an astigmatism difference (twice astigmatism) is applied, but astigmatism and astigmatism are the same as the astigmatism. It is reflected as.
This study evaluates the visual appearance when different loads are applied to both eyes, and inputs the information on the different appearances to the left and right eyes and evaluates the results. Become an experiment.

As a result of Table 1, it was found that there is the following relationship between dominant eye information, astigmatism and curvature of field.
(1) About astigmatism When the load is applied to the dominant eye and when both eyes are loaded, the appearance is almost the same, but when the load is applied to the non-dominant eye, it is visible. You don't get so bad.
That is, it can be considered that the deterioration of the retinal image due to astigmatism is dominated by the dominant eye load, and the appearance with both eyes is influenced by the appearance of the dominant eye.
(2) About curvature of field When both eyes are loaded, the appearance is worse. On the other hand, when the dominant eye is loaded and when the non-dominated eye is loaded, the appearance is not so much. It doesn't get worse.
That is, the deterioration of the retinal image due to the curvature of field becomes significantly worse when both eyes deteriorate. And it can be considered that there is no big difference between dominant eye load and non-dominant eye load.
Considering the design from these considerations, the following conditions A and B are important.
<Condition A>
Astigmatism should be reduced with a dominant eye. Since the dominant eye is dominant, the astigmatism may be slightly larger in the non-dominant eye than in the dominant eye.
<Condition B>
The curvature of field is not good for both eyes. That is, a design that improves astigmatism is not good for both eyes. Therefore, it is preferable to design the field curvature so that one of the left and right lenses is worse (or better) than the other.
The above formula 1 is a law derived when the condition A and the condition B are more specifically applied to a negative power lens and a positive power lens. By designing so as to satisfy the above formula 1, the present invention can be applied with practically reasonable optical performance.

More specifically, the design data of the aspherical element uses, for example, ray tracing, etc. to add a sag amount to the base spherical design, and to change the optical performance when the added sag amount is changed minutely. And calculating a preferred sag amount. For example, the lens is manufactured by the following process.
(A) First step (lens wearing data acquisition step)
For example, using a communication means that connects a spectacle store and a lens manufacturer, such as the Internet, a dedicated line, a telephone, and a fax, the spectacle lens wearer's prescription power (S power, C power, progressive power lens is added power from the spectacle store. ), Lens material refractive index, lens curve, lens center thickness, lens edge thickness, and other thickness specification items, lens diameter, interpupillary distance, apex distance, near distance, near object distance, near object distance The manufacturer (lens manufacturer) provides wearing data such as progressive zone length in progressive-power lenses, forward tilt angle of the frame, tilt angle of the frame, lens shape information of the frame, specification of the light passing point (or downward rotation angle) below the lens ) Is the process of receiving. At this time, it is necessary to receive at least the prescription frequency of the spectacle wearer from the spectacle store, and the standard value prepared in advance by the lens manufacturer is used for the deficient data.
(B) Second process (selection and design process of basic lens information)
Prescription power acquired in the first step, lens material refractive index, lens center thickness / lens edge thickness specification items, lens curve, lens diameter, frame forward tilt angle, frame tilt angle, frame lens shape, etc. This is a step of determining the surface curve shape and back surface curve shape, center thickness, lens diameter, prism amount, and prism base direction of the manufactured lens. In this process, the calculation of adding a sag amount to the spherical design of at least one of the surface curve shape and the back curve shape is performed by the computer to design the aspherical element. This design can be performed by a known technique. For example, Japanese Unexamined Patent Application Publication No. 2008-299168 discloses an aspherical element design of an aspherical lens, and Japanese Unexamined Patent Application Publication No. 2009-244600 discloses an aspherical element design of a progressive power lens. Is disclosed.
(C) Third step (lens processing step)
A lens material such as a semi-finished blank is processed by a CAM device as a processing device that receives an output from a computer (or integrated with the computer) based on the design data obtained in the above design process.

  According to the invention of each claim of the present application, it is possible to provide a spectacle lens capable of obtaining a suitable field of view when viewed with both eyes in which astigmatism and curvature of field are balanced by considering the dominant eye. It becomes possible.

FIG. 11 is an aberration distribution diagram of a progressive surface element combined with an aspheric element in Example 6. FIG. 10 is a diagram illustrating lens edge thickness of a base design including a progressive surface obtained by synthesizing a progressive surface with an aspherical base design in Example 6. FIG. 7 is a diagram for explaining a lens edge thickness after applying the present invention with FIG. 2 as a base design in Example 6.

Hereinafter, specific examples of the present invention will be described based on graphs.
Example 1
<Lens ordering process>
In Example 1, a lens purchaser visits a spectacle store, and as a result of measuring the lens power of this lens purchaser, the right eye is S-4.00D, the left eye is S-5.00D, and is superior in the hole-in card test. Assume that the eye determination is the right eye. From the eyeglasses store via telephone or the internet, the lens manufacturer gives the lens power (right eye S-4.00D, left eye S-5.00D), dominant eye information (right eye), lens design selected by the lens purchaser ( For example, an inner aspheric lens having a refractive index of 1.70 is transmitted.
<Base design process>
Next, at the lens manufacturer, the table curve of the semi-finished lens (thick lens molded only on the surface in the target shape) is selected as 1.0 curve according to the type and frequency of the lens ordered, and is registered as the standard value. A center thickness of 1 mm and a lens diameter of 75 mm are designated by the numerical values of the center thickness and the lens diameter. Then, using these designated preconditions, the lens shape of the base design for designing in consideration of the dominant eye information is calculated. In Example 1, it is assumed that the design that does not consider the dominant eye as shown in Table 2 is a base design that improves astigmatism over the entire lens surface. Table 2 is a graph showing the astigmatic difference (twice astigmatism) and the curvature of field in the lens edge direction from the lens geometric center of the left and right aspherical lenses of the base design, and the vertical axis is from the lens center. Distance (unit: mm), and the horizontal axis is aberration (unit: diopter). A solid line indicates astigmatism, and a broken line indicates field curvature. The graph is drawn as a result calculated by a computer based on the design data of the lens surface. In other words, in the base design, the design data is based on the design data after the aspherical elements are given after modification (all the following graphs are created in the same manner).
The lens shape of this base design is as follows.
・ Lens diameter: 75mm
Lens material refractive index: 1.70
-Right eye S frequency: S-4.00D
-Left eye S frequency: S-5.00D
Lens center thickness (right eye): 1.0mm
Lens center thickness (left eye): 1.0mm
Lens edge thickness (right eye): 4.33mm
・ Lens edge thickness (left eye): 5.27mm

<Design process in consideration of superiority>
The base design of the first embodiment is a design in which astigmatism is zero. A positive field curvature occurs in the lens periphery, and the amount of aberration increases around the lens. For such a base design, the present invention is applied to reflect the information on the dominant eye of the order information (dominant eye: right eye) in the design. The results are shown in Table 3. In Table 3, the astigmatism is worsened for the lens for the left eye, which is a non-dominant eye (the shape is gradually changed to a negative power toward the lens periphery), and the field curvature is improved (the aberration is reduced). Reduced). In other words, the design is such that the astigmatism of the right eye, which is the dominant eye, is relatively small, and the curvature of field is different between the left and right eyes, thus satisfying the above formulas (3) and (4). . Further, for the above equation 1, the amount of change in the field curvature of the dominant eye = A−B = 0, but the amount of change in the field curvature of the non-dominant eye = C−D> 0, so that AB− < It becomes CD and satisfies the above formula 1 (1). From the above, the lens with the base design modified as shown in Table 3 reflects the information on the dominant eye in the design compared with the case where the lens with the base design with the characteristics shown in Table 2 is worn when viewed with both eyes. A suitable field of view can be obtained.
The center thickness and edge thickness of the lens after application of the present invention are as follows. Since the field curvature is improved with the left eye, the amount of aspherical sag is reduced and the lens edge thickness is increased.
Lens center thickness (right eye): 1.0mm
Lens center thickness (left eye): 1.0mm
Lens edge thickness (right eye): 4.33mm
・ Lens edge thickness (left eye): 5.34 mm (5.27 mm for the base design)
When the present invention is applied when the dominant eye is the left eye in Example 1, astigmatism is deteriorated for the right eye lens, and the field curvature is improved. Even in that case, the above-mentioned formulas (1), (3), and (4) are satisfied.

(Example 2)
Example 2 is a case where the left and right sides are both S-4.00D and the dominant eye is the right eye. The design process in the lens manufacturer after the lens order information is transmitted to the lens manufacturer as in the first embodiment will be described.
<Base design process>
Depending on the type and frequency of the lens ordered by the lens manufacturer, the table curve of the semi-finished lens (thick lens molded only on the surface only in the target shape) is selected as 1.0 curve, and the value registered as the standard value is used. A center thickness of 1 mm and a lens diameter of 75 mm are designated. Then, using these designated preconditions, the lens shape of the base design for designing in consideration of the dominant eye information is calculated. In Example 2, the design that does not consider the dominant eye as shown in Table 4 is the case of the base design in which the field curvature is improved over the entire lens surface.
The lens shape of this base design is as follows.
・ Lens diameter: 75mm
Lens material refractive index: 1.70
-Right eye S frequency: S-4.00D
-Left eye S frequency: S-4.00D
Lens center thickness (right eye): 1.0mm
Lens center thickness (left eye): 1.0mm
・ Lens edge thickness (right eye): 4.63 mm
・ Lens edge thickness (left eye): 4.63 mm

<Design process in consideration of superiority>
The base design of the second embodiment is a design in which the curvature of field is zero. As a result, negative astigmatism occurs in the lens periphery, and the amount of aberration increases around the lens. For such a base design, the present invention is applied to reflect the information on the dominant eye of the order information (dominant eye: right eye) in the design. The results are shown in Table 5. In Table 5, astigmatism is improved (shifted from the minus side to the plus side) for the lens for the left eye, which is the non-dominant eye, and only for the lens for the right eye, which is the dominant eye, and the curvature of field is accordingly deteriorated. It was. That is, the right eye, which is the dominant eye, has little astigmatism, and the left and right lenses have different field curvatures. Here, the amount of change in the field curvature of the dominant eye = A−B <0 and the amount of change in the field curvature of the non-dominant eye = C−D = 0, so that A−B <C−. D, which satisfies (1) in Equation 1 above. In addition, since the astigmatism of the right eye, which is the dominant eye, is less than the astigmatism of the non-dominant eye, and the curvature of field is different between the left and right eyes, (3 ) And (4) are also satisfied. Therefore, in the second embodiment, the above equations (1), (3), and (4) are satisfied. A lens with a modified base design as shown in Table 5 can provide a better field of view than when a lens with a base design having the characteristics shown in Table 4 is worn when viewed with both eyes.

(Example 3)
The third embodiment is a variation in which the base design is changed in the second embodiment. The graph of Table 6 shows the astigmatism and field curvature change characteristics of the left and right aspheric lenses of the base design in Example 3. In the base design of Example 3, a well-balanced design in which aberrations are distributed to both astigmatism and field curvature is used. Since the lens of Example 3 is a minus lens, the astigmatism increases toward the lens periphery, and the curvature of field increases toward the plus side.
The aberration characteristics were changed so that such a base design had the characteristics shown in Table 5 of Example 2. In Example 3, astigmatism was deteriorated only for the lens for the left eye, which is a non-dominant eye, and the curvature of field was improved accordingly. That is, the right eye, which is the dominant eye, has little astigmatism, and the left and right lenses have different field curvatures.
This satisfies the formulas (1), (3), and (4) of the above equation (1). A lens with a modified base design as shown in Table 5 can provide a better field of view when worn with both eyes than when a lens with a base design having the characteristics shown in Table 6 is worn.

(Example 4)
In the fourth embodiment, the present invention is applied to the plus power. S + 5.00D for both left and right, and the dominant eye is the case for the right eye. The design process in the lens manufacturer after the lens order information is transmitted to the lens manufacturer as in the first embodiment will be described.
<Base design process>
The lens manufacturer selects the 5.0 curve for the semi-finished lens (thick lens formed only on the surface in the target shape) according to the type and frequency of the lens ordered. The minimum lens edge thickness is 1.0 mm and the lens diameter is specified as 70 mm from the numerical values registered as standard values. Then, using these designated preconditions, the lens shape of the base design for designing in consideration of the dominant eye information is calculated. In Example 4, the design that does not consider the dominant eye as shown in Table 7 is a base design in which astigmatism is improved over the entire lens surface.
The lens shape of this base design is as follows.
・ Lens diameter: 70mm
Lens material refractive index: 1.70
・ Right eye S frequency: S + 5.00D
・ Left eye S frequency: S + 5.00D
Lens center thickness (right eye): 4.79 mm
Lens center thickness (left eye): 4.79 mm
・ Lens edge thickness (right eye): 1.0mm
・ Lens edge thickness (left eye): 1.0mm

<Design process in consideration of superiority>
The graph of Table 7 shows the astigmatism and field curvature change characteristics of the left and right aspheric lenses of the base design in Example 4. In the base design of Example 4, the astigmatism was emphasized (no astigmatism). Since the lens according to the fourth exemplary embodiment is a plus lens, the curvature of field increases toward the minus side toward the lens periphery.
The results of changing the aberration characteristics by applying the present invention to such a base design are shown in Table 8 as a graph similar to Table 7. In Table 8, the astigmatism of the left-eye lens, which is a non-dominant eye, was worsened (the lens periphery was adjusted to achieve positive astigmatism), and the curvature of field was improved accordingly (aberration was reduced) did). That is, since the astigmatism of the right eye, which is the dominant eye, is small and the field curvature of the left and right lenses is not the same, the above formulas (3) and (4) are satisfied. For Equation 1, the amount of change in the field curvature of the dominant eye = A−B = 0 and the amount of change in the field curvature of the non-dominant eye = C−D <0, so that A−B> C−D. And the above equation 1 (2) is satisfied. That is, in Example 4, the above formulas (2), (3), and (4) are satisfied. A lens with a modified base design as shown in Table 8 can provide a better field of view when viewed with both eyes, compared to the case where a lens with the base design having the characteristics shown in Table 7 is worn.

(Example 5)
Example 5 is a case where the base design is different from Example 4 with the same frequency and the same superiority as Example 4. The design process in the lens manufacturer after the lens order information is transmitted to the lens manufacturer as in the first embodiment will be described.
<Base design process>
Similar to the fourth embodiment, the lens manufacturer selects the front curve of the semi-finished lens (thick lens formed only in the target shape only on the surface) as 5.0 curve depending on the type and frequency of the order received. A minimum lens edge thickness of 1.0 mm and a lens diameter of 70 mm are specified from the numerical values registered as standard values. Then, using these designated preconditions, the lens shape of the base design for designing in consideration of the dominant eye information is calculated. In Example 5, the design that does not consider the dominant eye as shown in Table 9 is a base design in which the curvature of field is improved over the entire lens surface. Since the lens of Example 5 is a plus lens, the astigmatism increases toward the plus side toward the lens periphery.
The lens shape of this base design is as follows.
・ Lens diameter: 70mm
Lens material refractive index: 1.70
・ Right eye S frequency: S + 5.00D
・ Left eye S frequency: S + 5.00D
Lens center thickness (right eye): 5.09mm
Lens center thickness (left eye): 5.09mm
・ Lens edge thickness (right eye): 1.0mm
・ Lens edge thickness (left eye): 1.0mm

<Design process in consideration of superiority>
The results of changing the aberration characteristics by applying the present invention to such a base design are shown in Table 10 as a graph similar to Table 9. In Table 10, the curvature of field of only the right eye lens, which is the dominant eye, was deteriorated (a negative curvature of field was added), and astigmatism was improved accordingly. That is, the right eye, which is the dominant eye, has little astigmatism, and the left and right lenses have different field curvatures. This satisfies the formulas (2), (3), and (4) of the above equation (1). A lens with a modified base design as shown in Table 10 can provide a better field of view when viewed with both eyes than when a lens with a base design having the characteristics shown in Table 9 is worn.

(Example 6)
Example 6 is an example of a progressive addition lens composed of a combination of an aspherical element and a progressive surface element. Assume that the left and right are both S-4.00D, the addition power is 2.00D, and the dominant eye is the right eye. Although the contents shown in the first to fifth embodiments can be applied as they are to the design method of the aspheric element, here, a progressive power lens is designed based on the aspheric element of the second embodiment.
<Base design process>
First, as in Example 2, the surface curve of the semi-finished lens (thick lens molded only in the target shape only on the surface) is selected as 1.0 curve depending on the type and frequency of the lens ordered, and registered as the standard value. From these numerical values, a center thickness of 1 mm and a lens diameter of 75 mm are designated. As shown in Table 4 of Example 2, an aspherical element is designed to be an aspherical base design. The progressive surface shown in FIG. 1 is combined with this aspherical base design. As a result of the synthesis, the lens thickness shown in FIG. 2 is obtained.

<Design process in consideration of superiority>
As in Example 2, the aspherical element is designed, and astigmatism is improved only for the right-eye lens, which is the dominant eye (shift from the minus side to the plus side), and the curvature of field is worsened accordingly. . As a result, the optical performance of only the aspheric element is as shown in Table 5. As a result of synthesizing the progressive surface of FIG. 1 to this aspherical element, the lens thickness is as shown in FIG. At this time, since the difference in optical performance between the base design and the design considering the superiority is the same as in the second embodiment, even in the progressive-power lens as in the sixth embodiment, (1) and (3) in the above formula 1 (4) is satisfied. A lens with a modified base design as shown in FIG. 3 can provide a better field of view when viewed with both eyes compared to the case where the lens with the base design having the characteristics shown in FIG. 2 is worn.

It should be noted that the present invention can be modified and embodied as follows.
In each of the above embodiments, either the dominant eye or the non-dominant eye is corrected with respect to the base design, but both lenses may be corrected.
The design data of the aspheric element is not limited to the rotationally symmetric shape, and for example, it is included in the present invention even if it is vertically asymmetrical or laterally asymmetric. In this case, for example, in the case of an asymmetric aspherical surface, the present invention is applied to optical performance in at least one direction in the upward direction or the downward direction.
-An aspherical element is not limited to being added to one side, and even if it is added to both sides, it is included in the application of the present invention.
The progressive surface element is not limited to being added to one side, and it is included in the application of the present invention even if it is added to both sides.
In the first embodiment, the determination of the dominant eye is an example using the hole-in-card test, but the application of the present invention is not limited by the method of acquiring the dominant eye information. For example, application of superior eye information determined using a visual field battle or the like to the present invention is also included.
The present invention includes a case where the strength of the eye superiority is reflected in the design as information on the dominant eye. In this case, the design correction amount that is the difference between the base design and the design considering the dominant eye is made to depend on the strength of the eye advantage. For example, since the eye superiority becomes equal at 5: 5, the design correction amount for the right-eye person at 8: 2 is preferably 6: 4, which is three times the design correction amount for the left-eye person.
-Besides, it is free to implement in a mode that does not depart from the gist of the present invention.

Claims (9)

A design method for a pair of left and right eyeglass lenses reflecting dominant eye information,
Compared to the design of the left and right lenses that do not reflect the dominant eye information with the specified astigmatism and curvature of field, the astigmatism is reduced and the curvature of field is increased for the lens on the dominant eye side of the wearer. A method for designing a lens for spectacles, characterized by: Design method of a spectacle lens according to claim 1, astigmatism characterized that you have expressed greater than the curvature of field in the design of the do not reflect the dominant eye information of the right and left lenses. A design method for a pair of left and right eyeglass lenses reflecting dominant eye information,
The design of the right and left lenses that do not reflect the dominant eye information with a predetermined astigmatism and field curvature, a multi-comb curvature astigmatism for either right or left non-dominant eye side to become lens wearers design method of a spectacle lens, which comprises designed to no less. 4. The method for designing a spectacle lens according to claim 3, wherein in the design of the left and right lenses that do not reflect the dominant eye information, the field curvature is greater than the astigmatic difference . A design method for a pair of left and right eyeglass lenses reflecting dominant eye information,
For a given astigmatism and field curvature have designed such reflects dominant eye information of the right and left lenses with, in the case of modifying the design of the lens in consideration of the right or left advantage in the eyes of the wearer, minus Astigmatism and curvature of field are set so as to satisfy the following expressions (1), (3), and (4) for the power lens, and (2), (3), and (4) for the plus lens. A method for designing a lens for spectacles.
Design method of a spectacle lens according to any one of claims 1 to 5, characterized in that only the design left or right one of the lens for the design of the right and left lens that does not reflect the dominant eye information. 7. The method for designing a spectacle lens according to claim 1, wherein the design is performed by including the design data of the aspherical element in the design data of the lens surface element. . The design data for designing a spectacle lens according to any one of claims 1 to 7, including progressive surface design data for designing a progressive power lens . A method for manufacturing a spectacle lens, comprising manufacturing a spectacle lens by processing a lens surface based on the design data acquired by the design method for a spectacle lens according to claim 1.