JP2014134782A - Visual distance calculation method of spectacle lens, visual distance display device and evaluation method of spectacle lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a visual distance calculation method of a spectacle lens by which a visual distance matched to consciousness of a user can be accurately computed and the user is enabled to comprehend the visual distance in wearing spectacle lenses, a visual distance display device and an evaluation method of the spectacle lens.SOLUTION: In the case where a wearing frequency of a spectacle lens for a user at any arbitrary coordinates is defined as A (diopter) and a reference distance frequency in which the user can focus a reference distance C (meters) is defined as B (diopter) when the user watches a distance (such a distance is defined as a reference distance hereafter), a value obtained by a following expression can be determined as a visual distance X (meter) in a visual line direction passing any arbitrary coordinates (Z, Y) where the spectacle lens is located.

Description

  The present invention relates to a spectacle-lens viewing distance calculation method, a viewing-distance display device, and a spectacle-lens viewing distance calculation method for evaluating the viewing distance of a spectacle lens at an arbitrary line of sight of the user according to the user's awareness when wearing the spectacle lens The present invention relates to an eyeglass lens evaluation method.

A user (wearer) of a spectacle lens may switch to a new spectacle lens depending on a change in the lens power of the user or may use a plurality of spectacle lenses having different characteristics depending on the purpose of use. Cases using multiple spectacles with different characteristics include, for example, focusing on looking far away with a progressive-power lens, and medium distances specialized for sitting at a desk and using a computer or reading a document ~ A case where the main object is to look near is assumed, and progressive power lenses having different characteristics are interchanged. In this case, it is more convenient to focus on a closer distance when looking straight at the front than when focusing on looking at a distance when focusing on looking from a middle distance to near with a progressive-power lens. For this reason, the lens design is selected and the power condition is adjusted so that the power when viewed from the front is slightly on the plus power side. Even when using a single vision (SV) lens to specialize to sit at a desk and use a personal computer or read a document, the frequency condition should be set slightly more positive than when focusing on looking far away. May be adjusted.
When adjusting the prescription power appropriately according to the application as described above or selecting the lens design according to the application, the distance that the user can see suitably when actually using a certain part of the lens ( In the following, there is a demand for knowing how much such distance is used as the viewing distance.

Japanese Patent No. 4804096

However, for example, as in Patent Document 1, there is an evaluation technique itself that simulates what an object looks like when an object is viewed using optical information of the lens and the wearer's eye. However, the evaluation is only a simulation value calculated in a computer based on optical information, and there is a problem that it does not necessarily match the subjective appearance of the wearer. This is due to the following reason.
The method of simulating the appearance of a spectacle lens according to the prior art in Patent Document 1 is to evaluate the appearance of an object point at a certain distance, trace the ray emitted from the object point, and determine how small it is on the retina. It evaluates whether the image point (focal point) is formed. However, under the condition that the image point is formed on the retina in the simulation evaluation of Patent Document 1, it is not necessarily true that a certain object point that is the starting point of the ray tracing ray is perceived so as to be best seen by the user. It has been found out by the inventors that this is not the case. For example, even if the result of simulation evaluation is that a distance of 3 m should look good, a user's awareness can only see a distance of about 1.5 m, or a user's awareness can see 5 m. There is a case. This is not an absolutely essential requirement to realize that a user can see a certain distance, which may be very small in focus on the retina, but not the user's previous experience, eyewear calendar, personality. This is because the user's request level changes depending on the reason.

However, since the simulation cannot always be performed according to the user's awareness, the conventional ray tracing method uses numerical values derived from the frame such as the sled angle, the forward tilt angle, the apex distance, etc. Improvements have been made to make the image point on the retina as close as possible to the actual user by reflecting the above information, for example, the axial length and pupil diameter in the simulation evaluation. However, no matter how much the user's image point on the retina is simulated, the user's required level varies from user to user. That's not necessarily the case when it is necessary that image points are connected on the retina. For this reason, the result of simulation evaluation using the conventional technique that uses only ray tracing for the focal point on the retina is only a reference value. It was difficult to explain what was visible.
The present invention has been made paying attention to such problems. The purpose is to accurately calculate the viewing distance according to a user's awareness and to allow the user to understand the viewing distance when wearing a spectacle lens. An apparatus and a method for evaluating spectacle lenses are provided.

  In order to achieve the above object, the invention described in the means 1 is a method for calculating a viewing distance in a line-of-sight direction that passes through certain coordinates of the spectacle lens when the spectacle lens is worn. The wearing power at an arbitrary coordinate of A is A (diopter), and when the user sees a certain distance (hereinafter referred to as such a reference distance), the user focuses on the reference distance C. When the frequency (hereinafter referred to as the reference distance frequency) is set to B (diopter), the value obtained by the following formula is used as the viewing distance X in the line-of-sight direction passing through certain coordinates of the spectacle lens. The gist is to seek as

Further, in the invention of the means 2, in addition to the configuration of the invention described in the means 1, the reference distance frequency B is suitable for the user to focus on the reference distance C when the user views the reference distance C. The gist is to use the frequency of awareness.
Further, the gist of the invention of means 3 is that, in addition to the configuration of the invention according to either means 1 or 2, the wearing power is represented by an equivalent spherical power.
Further, the gist of the invention of means 4 is that, in addition to the configuration of the invention according to any one of means 1 to 3, the viewing distance of the spectacle lens represented by the formula 1 is expressed by the following mathematical formula.

  Further, in the invention of the means 5, in addition to the configuration of the invention of the means 4, the viewing distance X of the spectacle lens is an adjustment force used by the user when the viewing distance X is viewed. ”), The gist is that it is expressed by the following mathematical expression by the sign of (A− (B−1 ÷ C)).

In addition, in the invention of the means 6, in addition to the structure of the invention of the means 5, when the viewing distance X of the spectacle lens is (A− (B−1 ÷ C)) <0, The gist is that it is represented by the following mathematical formula according to the relationship between the use adjustment force F used and (A− (B−1 ÷ C)).

In addition, in the invention of means 7, in addition to the structure of the invention described in means 5 or 6, the residual adjustment power that decreases as the age increases is defined as a function using age as a parameter, and the use adjustment power of the wearer is The gist is that F is set in consideration of the residual adjusting power corresponding to the age of the wearer.
Further, in the invention of means 8, in addition to the configuration of the invention described in any of means 1 to 7, the gist is that the reference distance power B is a distance diopter and the reference distance C is a far distance. .
In addition, in the invention of means 9, in addition to the configuration of the invention described in any one of means 1 to 8, the reference distance power B is an intermediate diopter power and the reference distance C is an intermediate distance of 1 m to 4 m. The gist.
Further, in the invention of means 10, in addition to the configuration of the invention described in any of means 1 to 7, the reference distance power B is a near vision power and the reference distance C is a near distance of 20 cm to 80 cm. Is the gist.
Further, in the invention of means 11, in addition to the configuration of the invention according to any one of means 1 to 7, the spectacle lens is gradually added in the plus direction from the distance portion area to the near portion area. A progressive addition lens having an addition gradient set, and the gist thereof is that an additional power corresponding to the addition ratio at the coordinate is added to the wearing power A at a certain arbitrary coordinate (Z, Y). .
Further, in the invention of the means 12, in addition to the configuration of the invention described in any one of the means stages 1 to 11, the gist is that the arbitrary coordinate is a distance fitting point position.

Further, in the invention of means 13, when the wearing power of a certain user eyeglass lens is A (diopter) and the reference distance power that the user can focus on when viewing the reference distance C is B (diopter) Input screen display means for displaying on the monitor screen an input screen prompting the user to input numerical values of the wearing frequency A and the reference distance frequency B, and the wearing frequency A and the reference distance input on the input screen. Calculation means for performing calculation by the viewing distance calculation method for a spectacle lens according to any one of claims 1 to 11 using the frequency B;
A viewing distance display means for displaying on the monitor screen the distance calculated when the value calculated by the calculating means is viewed with a line of sight passing through the coordinates of the spectacle lens;
The gist is that
Further, in the invention of the means 14, in addition to the configuration of the invention described in the means 13, the input screen display means has numerical values of a plurality of types of wearing frequencies A and reference distance frequencies B corresponding to a plurality of types of spectacle lenses on the monitor screen. An input screen that prompts the user to input, and the viewing distance display means displays the plurality of values calculated by the calculating means on the monitor screen as the viewing distances of the plurality of types of eyeglass lenses. The gist.
In addition, in the invention of the means 15, in addition to the configuration of the invention according to any of the means 13 or 14, the calculation means calculates a ratio of the viewing distances of the plurality of types of spectacle lenses based on one viewing distance. The gist of the visual distance display means is to display the ratio on the monitor screen.
In addition, in the invention of means 16, in addition to the configuration of the invention described in any of means 13 to 15, the input screen display means displays a correction input screen for prompting correction of the frequency at the distance power measurement position on the monitor screen. If there is an input to the correction input screen, an arbitrary first correction frequency is given to the frequency at the distance power measurement position based on the input information to correct the frequency at the distance power measurement position. At the same time, the gist of the present invention is that a calculation is performed by the calculating means by giving the addition power a second correction power having the same absolute value as the first correction power and a different plus or minus sign.
In addition, in the invention of the means 17, in addition to the configuration of the invention described in any one of the means 13 to 16, the input screen display means displays a correction input screen for prompting the input of the correction amount of the frame position on the monitor screen. When there is an input to the correction input screen, the wearing frequency A is changed according to the corrected vertical position participation rate based on the input information, and the calculation by the calculation means is performed. The method for displaying a viewing distance of a lens according to any one of means 12 to 15, characterized in that:
Further, the gist of the invention of the means 18 is that, in addition to the configuration of the invention described in any of the means 13 to 17, the arbitrary coordinate is a distance fitting point position.
In addition, in the invention of the means 19, in addition to the configuration of the invention according to any one of the means 13 to 18, the viewing distance display means sets the distance on the monitor screen with a length corresponding to the numerical value calculated by the calculation means. The gist of this is shown and displayed.
In addition, in the invention of the means 20, in addition to the configuration of the invention described in the means 18 or 19, the viewing distance displayed on the monitor screen by the viewing distance display means is either the right eye or the left eye of the wearer. The gist is that the weight is given to the side for calculation.
The gist of the invention of means 21 is that, in addition to the configuration of the invention described in any of means 13 to 20, the display of the monitor screen is three-dimensionally performed.
In addition, in the invention of the means 22, in addition to the configuration of the invention described in any one of the means 13 to 21, the input screen is disclosed on the WEB page, and the wearing frequency A and the reference distance frequency input to the input screen are displayed. The gist is that a value calculated based on the numerical data of B is displayed on the WEB page as the viewing distance of the spectacle lens.
Further, in the invention of means 23, in addition to the configuration of the invention described in any one of means 1 to 12, the gist of calculating the visual distance at each point of the spectacle lens and evaluating the spectacle lens based on the visual distance. And
Further, in the invention of the means 24, in addition to the configuration of the invention described in any one of the means 13 to 22, the viewing distance at each point of the spectacle lens is calculated, and the viewing distance is displayed on the monitor screen. The gist is that the spectacle lens is evaluated using the viewing distance display result and the result is displayed on the monitor screen.

In such a configuration, when the wearing power at an arbitrary coordinate of a certain spectacle lens of a user is A (diopter) and the user looks at a certain distance (hereinafter, such distance is referred to as a reference distance), When the reference distance frequency at which the user can focus on the reference distance C is B (diopter), the value obtained by the above equation 1 is the viewing distance in the line-of-sight direction that passes through certain coordinates of the spectacle lens. X can be obtained. Here, the arbitrary coordinates are coordinates through which a line of sight passes when calculating the viewing distance, and indicate coordinates (Z, Y) when the geometric center of the lens is the origin (horizontal direction, vertical direction) For example, Z is positive in the right direction when viewed from the lens surface (that is, the nose side of the right eye), and Y is positive in the upper part of the lens. For example, in a progressive-power lens, the viewing distance changes depending on which coordinate on the lens the line of sight passes. Therefore, the coordinates through which the line of sight passes when calculating the viewing distance are set as arbitrary coordinates. For example, meters are generally used as the distance unit, but other units may be used.
Here, the expression 1 will be described. The wearing power A is a power at an arbitrary coordinate of the lens selected or about to be selected by the user, and the wearing power A is not necessarily a power at which the user can see infinite distance. Rather, the frequency is such that it cannot be focused at infinity for some reason. On the other hand, the reference distance frequency B is a frequency unique to the user that can be focused on the reference distance C when the user views the reference distance C. Therefore, the reference distance frequency B is a frequency in a state where the distance C is in focus. is there. In the equation (1), since the calculation is performed by a function using the reference distance frequency B that the user can focus at the reference distance C as a parameter, a viewing distance that matches the user's awareness can be calculated. In the formula (1), in addition to the wearing power A, it is important to calculate the viewing distance that matches the user's awareness that the function is composed of two parameters, the reference distance power B and the reference distance C. The reason and the structure of Equation 1 will be described below.
First, for example, consider obtaining the viewing distance in the viewing direction passing through some arbitrary coordinate (Z, Y). If a light ray starts from a certain viewing distance X, the light beam passes through the lens and is focused on the retina. At this time, the viewing distance X is determined by the frequency of a minute region through which the light ray passes on the lens. For example, when the frequency of the minute area is 0D, the viewing distance X = infinity, and when the frequency of the minute area is 0.5D, the viewing distance = 2 m. Thus, the frequency of this minute area is a frequency error, and the viewing distance X is the reciprocal of the frequency error of an arbitrary coordinate (Z, Y). Therefore, if a power error at an arbitrary coordinate (Z, Y) of a certain user is obtained, the imaging state on the retina can be known, and the viewing distance can be obtained. However, as described above, since the viewing distance perceived by the user is different from the imaging state on the retina, it is not possible to calculate the viewing distance that matches the user's awareness only from the imaging state on the user's retina. Have difficulty. Therefore, in order to obtain a power error at an arbitrary coordinate (Z, Y) when a certain user wears a spectacle lens, a function f (reference distance frequency B and reference distance C perceived by the user and parameters f ( B, C) is used to obtain information on the image point (focal point) on the retina that a certain user recognizes as preferable, and use the difference between the reference distance A and f (B, C) as the frequency error. Good. Therefore, the viewing distance X can be obtained by the reciprocal of the frequency error obtained by Af (B, C) as shown in Equation 1.

Here, the reference distance frequency B is suitable not only when the reference distance C is viewed, but also when the user looks at the reference distance C, as well as the frequency when the retina is in focus (in focus). It may be the frequency that can be realized. This means that when the user sees a certain distance, it is not essential that the user is aware that the distance is visible, so it is not essential that the user is most focused on the retina. This is because it is important. When using the most focused power on the user's retina (for example, a perfect correction power for an infinite distance), the user's “distance that can be perceived as suitable” does not necessarily match Therefore, in order to make the user's awareness and the distance obtained by the visual distance evaluation the same, it is preferable to use the reference distance frequency B that the user can recognize as suitable when viewing the reference distance C.
The wearing power A is preferably represented by an equivalent spherical power. The equivalent spherical power is a power represented by S power + C power / 2, and can be evaluated including astigmatism power information when there is astigmatism.

Further, the viewing distance X is preferably expressed by the formula 2 above. By using the equation (2), it is possible to evaluate and calculate the viewing distance based on the reference distance frequency B and the reference distance C when the wearing power is A. The denominator of the equation (2) indicates the image state on the retina, that is, the power error at an arbitrary coordinate (Z, Y). The meaning of the equation is that the reference distance C is the viewing distance at 1 / C. B-1 / C is the difference between the ideal lens power and the reference distance power B that the user has actually determined to be preferable, that is, the reference distance C and the reference distance power B. The tolerance of the frequency error with respect to the user's view request calculated from the above is shown. A- (B-1 / C) is an allowable difference between the wearing power A and the user's power error, and this is the power error actually noticed by the user. And the image formation state on the retina becomes blurred regardless of whether the focal point (image point) is in front of or behind the retina. The viewing distance X can be obtained.
Further, the viewing distance X can be expressed by the above formula 3 when the adjustment force used by the user when viewing the viewing distance X is F (diopter, hereinafter referred to as “use adjustment force”). When calculating the viewing distance when wearing a good mirror lens, when focusing on the back side of the retina, that is, when (A− (B−1 ÷ C)) is negative, the lens is inflated to focus more closely. The adjustment that makes it fit occurs. For this reason, in the denominator of Equation 3, the use error F is added to (A− (B−1 ÷ C)) to calculate the frequency error perceived by the user when adjustment occurs. is there.
The viewing distance X is preferably expressed by the equation (4). This is because, when the focal point is formed on the back side of the retina and the amount of defocus is within the range of the use adjustment force F, the adjustment works so that the focal point is formed on the retina and a long distance can be seen. This is because
Further, the residual accommodation power that decreases with increasing age is defined as a function using age as a parameter, and the use accommodation power F of the wearer is set in consideration of the residual accommodation power corresponding to the age of the wearer. It is good. This is because when a person ages, the residual adjustment power weakens, and therefore, when calculating the use adjustment power F, the residual adjustment power according to the age of the person is taken into consideration.
The reference distance C may be any one of a long distance of 5 m or more, an intermediate distance of about 1 to 4 m, and a short distance of about 20 to 80 cm. When the reference distance C is a distant distance, the reference distance frequency B is a distant frequency. However, the far frequency is good because it is easy to calculate an accurate frequency because adjustment intervention is unlikely to occur when measuring the power of the user's eyes. In addition, when the reference distance C is an intermediate distance of about 1 to 4 m, the reference distance frequency B is an intermediate diopter, but is actually a distance that can be measured in an ophthalmic examination room or a spectacle store. This is because a combination of the reference distance C and the reference distance frequency B that is close to the user's feeling is easily obtained. Further, when the reference distance is a short distance of about 20 to 80 cm, the reference distance frequency B is a near diopter power, but it is good because an intermediate visual distance evaluation from the near can be evaluated according to the user's actual feeling. .
In addition, the spectacle lens used here includes a myopic lens, a hyperopic lens, and a presbyopic lens, and further includes a progressive addition lens.

In particular, in a progressive-power lens, the addition gradient is set so that the spectacle lens is gradually added in the plus direction from the distance portion region to the near portion region. The wearing power at the coordinates (Z, Y) on the lens through which the line of sight passes depends on whether it passes through. Therefore, when the spectacle lens is a progressive power lens, it is necessary to add an additional power corresponding to the addition ratio at the coordinates (Z, Y) to the wearing power A of the progressive power lens. This additional power is obtained by multiplying the addition power by the addition ratio, and the addition power is generally the difference in power between the distance power measurement position at the top of the lens and the near power measurement position at the bottom of the lens. There is a correlation in which the power is gradually added in the positive direction with the displacement of the vertical position from the distance power measurement position to the near power measurement position. The power change on the main gaze that connects the distance power measurement position and the near vision power measurement position and moves the distance vision from the far vision to the intermediate vision, and the near vision and the line of sight is called an addition curve. This addition curve is an important indicator of the product characteristics of the progressive power lens because it is related to the power change on the main gazing line, that is, the viewing distance about the sight line passing through the respective coordinates on the main gazing line.
In particular, the viewing distance when looking straight ahead when wearing a spectacle lens indicates the usability of the lens. For example, in a progressive power lens A, an additional power of 10% of the addition power is added to a line of sight 2 mm above the geometric center of the lens, that is, a line of sight when looking straight ahead (recommended frame position), and a certain progressive refractor is added. In the power lens B, it is assumed that an additional power of 30% is added in the same line of sight. Assuming that a user with a power of S-4.00D (diopter) and a power of addition of 2.00D hangs the progressive power lens A and the progressive power lens B at the distance measurement position, it looks straight. In the case of the progressive addition lens A, the wearing power is −4.00 + 2.00 × 0.1 = −3.80D, and in the case of the progressive addition lens B, −4.00 + 2.00 × 0.3 = −3. 40D.

  In addition, there is a demand to see whether the viewing distance changes when the distant appearance of a user at a certain vertical position is changed. In this case, if the lens is not a progressive-power lens, it is only necessary to input a different power. However, in the case of a progressive-power lens, the addition gradient is set as described above, and the power in the near-field region is not changed. Therefore, it is necessary to consider the addition power when changing the power. Therefore, when correcting the frequency, an arbitrary first correction frequency is given to correct the S frequency, and a second correction frequency having the same absolute value as the first correction frequency but having a different plus or minus sign is used as the addition frequency. By calculating so as to give, it is possible to accurately calculate the viewing distance even when such a correction is made.

Also, for progressive-power lenses, when the lens frame position (height) is arbitrarily changed according to the user's purpose of use or the vertical width of the frame, for example, the viewing distance when looking straight ahead is to be confirmed. There is a request. For example, it is a case where the viewing distance is calculated when the recommended frame placement position of the lens is moved 3 mm upward from the geometric center and the lens is placed 3 mm upward.
In this case, the difference between the recommended frame position of the lens and the actual frame position is used as the correction amount, and the addition power is set to the addition power corresponding to the addition ratio of the corrected vertical position based on the input information of the correction. Change to obtain the wearing frequency A. The addition power change according to the addition ratio in the vertical position is based on the recommended frame position (height) of the lens, and the addition ratio on the addition curve according to the position where the frame is changed vertically from there And calculating the wearing power A as described above from the participation rate, and even when such a frame position change has occurred, an accurate viewing distance can be calculated. .
For example, in the above case, when the frame is moved 3 mm above the recommended frame position of the lens, that is, when the eye position (fitting point) is 1 mm below the geometric center, the addition at the recommended frame position is performed. Consider a case in which a progressive power lens A having a ratio of 10% is worn by a user who has a power of S-4.00D (diopter) at a distance measurement position and an addition power of 2.00D. In that case, based on the addition curve of the progressive power lens A, the addition ratio 1 mm below the geometric center is calculated. For example, when the joining ratio below 1 mm is 25%, the wearing frequency can be calculated as −4.00 + 0.25 × 2 = −3.50D.

Examples of the input screen display means, the calculation means for executing the calculation, and the viewing distance display means for displaying the viewing distance on the monitor screen include a computer in which a calculation program held in a spectacle store is installed. In this case, the viewing distance is calculated according to the calculation program in the computer of the person who operates based on the contents input on the input screen displayed on the monitor screen.
Further, it is assumed that the input screen is displayed on, for example, the lens manufacturer's WEB page and is displayed on the monitor screen by operating the client computer and accessing the WEB page through a communication line. In this case, the calculation program is stored in the server on the lens manufacturer side. In response to a WEB page request from the client computer on the client side, the server returns a WEB page to the client side, and further from the client side. On the server side, the viewing distance is calculated based on the data transmission, and the calculated simulation frequency is made public on the WEB page.
The visual distance may be displayed as it is, or the distance corresponding to the calculated numerical value may be displayed on the monitor screen as shown in the figure.
Further, when calculating the viewing distance, a viewing distance close to the actual appearance of the wearer can be obtained by weighting and calculating either the right eye or the left eye of the wearer. .

  In the present invention, it is possible to accurately calculate the viewing distance in accordance with the user's awareness and to allow the user to understand the viewing distance when wearing the spectacle lens.

The conceptual diagram explaining that the terminal computer and server explaining embodiment of this invention are integrated in the internet. FIG. 3 is a schematic diagram of a viewing distance display form displayed on a monitor by a browser in the first embodiment. A graph of the addition curve of a perspective progressive lens. The schematic diagram of the input form of the correction amount of the fitting position in Embodiment 2. FIG. The schematic diagram of an input form which shows the change of an image when the correction amount is input into the input form of FIG. The distribution map of the viewing distance showing an example of the viewing distance evaluation when the user 2 wears the perspective progressive wearing. 18 is a graph showing the relationship between age a and residual accommodation power in the seventh embodiment. In Embodiment 8, (a) is an index to be displayed on the input form so that the wearer can check the dominant eye, and (b) is an input form of the dominant eye. The table which showed the weighting rate at the time of giving a weight according to dominant eyes in Embodiment 8. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a lens viewing distance display device, a viewing distance calculation method, and a lens evaluation method according to the present invention will be described below with reference to the drawings.
(Embodiment 1)
In the first embodiment, examples of the viewing distance calculation method and the viewing distance display device under conditions where no adjustment occurs will be described. The information of user 1 in the first embodiment is as follows.
<Information of User 1 in Embodiment 1>
・ Frequency of previous glasses (same power on the left and right) S-4.00 C-0.00 ADD 2.00
・ Types of previous glasses: Perspective progression ・ Frequency of new glasses (assuming the same power on the left and right) S-4.00 C-0.00 ADD2.00
・ New glasses types: Comparison between middle and middle progressions ・ Reference distance C: Infinite distance (more than 5m)
Reference distance power B (distance dioptric power): S-4.25 C-0.00
In the first embodiment, a specific case is assumed in which a visual distance when looking straight ahead in a simulation is calculated by accessing a manufacturer's homepage mainly through a value measured at an eyeglass dealer. ing.
As shown in FIG. 1, the Internet is a communication network in which a plurality of LANs (Local Area Networks) 10 are connected on a large scale through communication lines such as telephone lines.
The eyeglass store has a terminal computer 11. The terminal computer 11 is a WWW (World Wide Web) client connected to the Internet. The terminal computer 11 is an information processing apparatus having a normal hardware configuration that can execute a program in response to a user input, and a built-in hard disk includes a browser necessary for using the WWW, an OS (Operation System), and the like. Are installed in advance. Control of each program is executed by a CPU (Central Processing Unit) in the terminal computer 11. An input device 12 (mouse, keyboard, etc.) and a monitor 13 are connected to the terminal computer 11.
As shown in FIG. 1, the manufacturer has a server 15 connected to the Internet. The server 15 is an information processing apparatus having a normal hardware configuration capable of loading a program onto a memory and executing the program in response to an instruction from the outside. Software such as httpd (HyperTextTransferProtocolDaemon) that gives available files to the browser when a request is received, CGI (CommonGatewayInterface) script that processes data from httpd, number calculation program started by CGI script, OS, etc. are installed Yes. The control of each program is executed by a CPU (central control unit) in the server 15. Here, the CPU of the server 15 is an input screen display means, a calculation means, and a viewing distance display means.

The spectacles store operates the terminal computer 11 to start a browser on the monitor 13 and inputs a URL (UniformResourceLocators) of a predetermined site on the manufacturer side, and calls the manufacturer's WEB page to display it on the monitor 13.
As shown in FIG. 2, a visual distance display form 21 for a progressive power lens that also serves as an input screen for inputting data values to be input on the spectacles store side is prepared on the WEB page on the manufacturer side. Yes. The layout of this form 21 is an example, and the display in the changed mode is free. The actual display mode in the viewing distance display form 21 is color display.

The area on the upper side 2/3 of the viewing distance display form 21 is an input area 21A. In the input area 21A, a first area 22A for displaying the contents of “previous glasses” and a second area 22B for displaying the contents of “new glasses” are displayed in order from the top. Three regions 22C are provided. The previous spectacles refer to the spectacles used by the lens purchase examiner when purchasing the lenses and their frequencies, and the new spectacles refer to the spectacles considered by the lens purchase examiners and their frequencies. Further, in the first embodiment, the reference distance C shown in the claims is set in the program to be infinitely far away, and the input of the distance diopter is obtained as the reference distance frequency B.
An icon of a list box 24 for selecting one (previous glasses) from a plurality of products is displayed on the left side of the first region 22A, and a plurality of first items for inputting lens data are displayed on the right side. An icon of a lens data box 25 and a frequency copy button 28 capable of GUI input is provided. The program user (for example, an eyeglass shop clerk) has three types of “perspective progression, middle progression, and near middle progression” in the list box 24 according to the type of spectacle lens used by the wearer (user) before. One lens is selected, and the S lens, C power, astigmatic axis (AX), and addition power (ADD) values of the left and right lenses are input to the first lens data box 25 as lens data of the selected lens. Enter by.
Here, there are products with various product specifications for the perspective progression, the mid-range progression, and the near-mid progression, but here, the “perspective progression” means the addition at the recommended frame position (fitting point) 2 mm above the geometric center. The lens has a ratio of almost 0%, a viewing distance when looking straight ahead is a far distance, and a viewing distance from a distance to the hand on the main line of sight. “Middle-progression” means that the addition ratio at the recommended frame position (fitting point) is 25%, the viewing distance when looking straight ahead is the intermediate distance, and the view from the middle to the hand on the main line of sight It is a lens that becomes a distance.
“Near middle progression” means that the addition ratio at the distance measurement position is 37.5%, the viewing distance when looking straight ahead is closer to the hand than the above middle progression, and slightly on the main gaze. It is a lens that provides a viewing distance from the middle to the hand.

On the left side of the second region 22B, information on two types of lenses, ie, medium and near progression A and near and middle progression B, is displayed in advance as “new glasses”, and a plurality of pieces of lens data are input on the right side. The second lens data box 26 is displayed. The program user inputs the values of S power, C power, astigmatism axis (AX), and addition power (ADD) of the left and right lenses of the wearer (user) to be prescribed with these spectacle lenses into the second lens data box 26. Input by device 12. The numerical value in the first lens data box 25 is copied into the corresponding box in the second lens data box 26 by inputting the icon of the frequency copy button 28 with the GUI.
The new glasses to be prepared may be one type or three or more types instead of two types.
On the left side of the third area 22C, the characters “Please input the distance diopter as a reference diopter” are displayed, and on the right are a plurality of third diopters for inputting the distance diopter data. A lens data box 27 is displayed. In the first embodiment, this distance diopter is the reference distance frequency B in the claims, and in this case, information that the reference distance C = infinite distance is described in the program. Here, the program user recognizes that the distance of the single-focus spectacle lens that the wearer (user) sees far enough is the distance diopter power, and sets the values of the S power, C power, and astigmatic axis (AX) of the left and right lenses. The data is input to the third lens data box 27 by the input device 12.
A calculation completion notification box 35 is displayed at the lower center position of the third region 22C along with the completion of the calculation, and the text “Calculated viewing distance” is displayed. The button 30 icon is displayed. The visual distance is calculated based on the numerical value by inputting the icon of the visual distance calculation button 29 using the GUI, and the calculation result is canceled by inputting the GUI of the clear button 29 using the GUI.

The area on the lower side 1/3 of the viewing distance display form 21 is a display area 21B. A calculation result display area 31A in which numerical values obtained by calculation are displayed on the right side of the display area 21B, and the area from the left to the center is relatively close to the position in plan view of the face (here, 0 m). (4m) is displayed, and a drawing area 31B is displayed on the scale for displaying the image of the arc-shaped color line segment 32 at a position corresponding to the viewing distance.
In the calculation result display area 31A, the viewing distance (cm) of “previous (glasses)”, the viewing distance (cm) of “new glasses (progressive middle)”, and the ratio (%) to the viewing distance of the previous glasses, The result of the calculation of the viewing distance (cm) of “new glasses (progress in the middle)” and the ratio (%) to the viewing distance of the previous glasses for each of the right eye (R) and the left eye (L) is displayed. A box 33 is displayed. In the actual viewing distance display form 21, the “previous” character is displayed in blue, the “middle progressive” character is displayed in red, and the “middle progressive” character is displayed in green.
The visual distance color line segment 32 displayed in the drawing area 31B employs an average value when both R-eye and L-eye data are input, and is effective when only one eye is input. Eye figures are adopted. Each color line segment 32 of “previous glasses (no glasses)”, “new glasses (progressive near-neighborhood)”, and “new spectacles (progressive near-neighborhood)” is drawn with a color corresponding to the color of the above character for distinction. The
In the lower area of the calculation result display area 31A, an icon of the expert adjustment button 34 for performing correction calculation by giving the S frequency of “new glasses” a slight frequency (here, 0.25D) as the correction value ΔS is displayed. ing. This is for adjusting the power at the distance power measurement position while keeping the near power constant.

  In the configuration as described above, numerical data input to the boxes 25 to 27 in the first to third regions 22A to 22C is GUI-inputted to the viewing distance calculation button 29 or the expert adjustment button 34 (for example, a mouse click operation) To the server 15 side. The server 15 receives this transmission and causes the CGI script to execute the calculation program. The server 15 displays the executed result in the box 33 in the calculation result display area 31A. At the same time, the color line segment 32 is displayed in the drawing area 31B so as to be in a position corresponding to the distance of each of the “previous glasses (no glasses)”, “new glasses (middle and near progressive)”, and “new glasses (near and middle progressive)” . At the same time, the text “Calculated viewing distance” is displayed in the calculation completion notification box 35. FIG. 2 shows an example of a state in which these calculation results are displayed in the display area 21B based on the GUI input.

In the present embodiment, the CPU of the server 15 calculates the following numerical formula using a calculation program executed by the CGI script using the input numerical data as a parameter.
(1) Calculation of Wearing Frequency A at Fitting Point In the first embodiment, arbitrary coordinates (Z, Y) = (0 mm, 2 mm), that is, the viewing distance about the line of sight passing through the fitting point 2 mm above the geometric center. It is what you want. First, the wearing power A of each spectacle lens of “previous spectacles”, “new spectacles (proximal progressive)”, and “new spectacles (progressive near)” is obtained by the following equation (5). As the “previous glasses”, different joining ratios are used depending on any of the selected “prospective progressive, medium-neighbor progressive, and near-mid progressive”.

Here, the joining ratio in the equation (5) is a numerical value indicating how much power of the addition power is contained at the fitting point. The vertical position of the lens and the addition ratio are determined by a unique addition curve depending on the lens type as a function of the distance and addition power from the distance power measurement position to the near power measurement position. Here, it is assumed that a unique addition curve is prepared for each of the near-progressive, middle-neighbor progressive, and near-neighbor progressive glasses (lenses), and the addition ratio at the fitting point acquired in advance is used for each.
In the Perspective Progression, the addition power has not yet been added, so it is 0.00% as the addition power is 0%, In the Middle Progression, the addition power is 25%, and the addition power is 0.25. As the frequency, 0.375 is set.
Next, the wearing frequency A at the fitting point of “previous spectacles”, “new spectacles (progression in the middle and near)”, and “new spectacles (promotion in the near and middle)” is obtained. Assuming that the wearing power of each user's glasses is A (old), A (newA), and A (newB), the wearing power A can be calculated as follows.
Previous glasses (progressive perspective)
Wear frequency A (old) = (− 4.00 + 0.00 / 2) + 2.00 × 0.00 = −4.00D
New glasses (progression in the middle and near)
Wear power A (newA) = (− 4.00 + 0.00 / 2) + 2.00 × 0.25 = −3.50D
New glasses (progress in the middle)
Wear frequency A (newB) = (− 4.00 + 0.00 / 2) + 2.50 × 0.375 = −3.25D

(2) Calculation of viewing distance X at fitting point Viewing distance X of each spectacle lens of “previous spectacles”, “new spectacles (proximal progressive)”, and “new spectacles (progressive near)” Find (meter). Let X (old), X (newA), and X (newB) respectively.

Specifically, the viewing distance at the fitting point of the user 1 is as follows.
Previous glasses (progressive perspective)
X (old) = 1 / (| −4.00 − (− 4.25-1 / ∞) |)
= 0.4m = 400cm
New glasses (progression in the middle and near)
X (newA) = 1 / (| −3.50 − (− 4.25-1 / ∞) |)
= 0.133m = 133cm
New glasses (progress in the middle)
X (newB) = 1 / (| −3.25 − (− 4.25-1 / ∞) |)
= 0.1m = 100cm

(3) Calculation of Relative Ratio with respect to Viewing Distance of “Previous Glasses” The relative ratio with respect to the viewing distance of “previous glasses” is calculated by the following equation.

The numerical values obtained by the calculations (1) to (3) are performed for the left and right eyes, and these numerical values are displayed in the corresponding boxes 33. Then, for the numerical values performed for the left and right eyes, a value obtained by adding them and dividing by 2 (that is, the average value of the left and right eyes) is calculated, and the color line segment 32 is arranged at a position corresponding to the numerical value.
Also, by inputting the expert adjustment button 34, a numerical value obtained by correcting the calculated value can be obtained. The correction by the expert adjustment button 34 is executed by correcting the wearing power A by the following formula. The numerical value corrected simultaneously with the completion of the correction calculation is displayed in the corresponding box 33, and the position of the color line segment 32 is changed and displayed. Here, the reason why the correction value ΔS is subtracted from the addition power is to prevent the near power from being changed even if the S power is changed.

With the configuration as described above, the following effects are achieved in the first embodiment.
(1) By calculating the viewing distance from the distance diopter power, which is the power at which the distant view is suitable for the wearer, the reference distance C (infinitely far) at that time, and the wear power A at the fitting point, The viewing distance can be obtained as a close numerical value. For example, in the first embodiment, the viewing distance of new spectacles (proximity progressive) is evaluated as 133 cm. However, if the present invention is not used, that is, the calculation is performed without considering the reference distance and the reference distance frequency, the viewing distance = 1 / (addition power × addition ratio) = 200 cm. Therefore, in the conventional calculation, although it is simulated that the distance up to 200 cm can be seen, only 133 cm is actually seen, and there is a deviation from the actual feeling, but the viewing distance that the user feels is calculated by the effect of the present invention. it can.
(2) The viewing distance of the “previous glasses” and the viewing distances of a plurality of glasses having different viewing distances as “new glasses” are displayed as color line segments 32 in the drawing region 31B as distances according to the viewing distance at the same time. The difference in viewing distance between the glasses can be understood at a glance. Further, since the relative ratio of how far the viewing distance of the “new glasses” is relative to the viewing distance of the “previous glasses” is also displayed, it is easy to compare the two.
(3) By operating the expert adjustment button 34, it is possible to know the change in the viewing distance when the distance power is slightly changed, which is convenient for fine adjustment of the distance power.
(4) In the spectacles store, how easily the viewing distance changes at the fitting point when changing from perspective to middle / near / mid-range or between middle / near / mid-range progression It becomes possible to understand, and it becomes possible to judge a change risk due to a change in viewing distance when changing lenses and a merit due to a change in view distance when changing lenses.

(Embodiment 2)
The second embodiment is a variation of the first embodiment, and is a visual distance calculation method for changing the frame insertion position (height) when the lens is framed in the spectacle frame.
In the second embodiment, the same user 1 as in the first embodiment changes the frame height when creating new glasses using the same lens as the previous spectacles (perspective progression) in the first embodiment. . User 1's previous glasses (progressive perspective) are as shown in the addition curve in FIG. The recommended fitting position (height) for this perspective progression is +2 mm from the geometric center. The participation rate at this position is 0%. For example, a case where the lens is moved 4 mm above the recommended fitting point when framed in the frame with new glasses for the user 1 will be described below. In the second embodiment, as in the first embodiment, the viewing distance for the line of sight viewed straight is evaluated. The addition curve is not constant depending on the characteristics of the lens, and FIG. 3 is an example. A function expression indicating the addition curve is associated with each lens and stored in the memory in the server 15.

(1) Acquisition of fitting height correction amount at the time of frame insertion The fitting position correction amount input form 35 shown in FIG. 4 is included in the visual distance display form of the first embodiment in the input form of the second embodiment. It has been added. FIG. 4 shows a vertical shift state between the user's eye point and the corrected fitting position as a lens schematic diagram 36 in which the pupil is arranged on one lens (here, the left side). In the default state, the eye point and the fitting position match as shown in FIG. A correction amount input box 37 is displayed on the input form 36. In the correction amount input box 37, a correction amount of the recommended fitting point position specific to the lens is input. Here, for example, +4.0 is input as shown in FIG. Then, the display line indicating the fitting position moves according to the correction amount, and the amount of movement and the direction of movement in the vertical direction can be known in relation to the broken line indicating the eye point position. Hereinafter, an example of calculation executed by the CPU of the server 15 with the correction amount of 4 mm will be described.
(2) Calculation of addition ratio after correction of fitting position Since the recommended fitting position (height) is +2 mm and the correction amount of the fitting position is +4 mm, the reference height of the addition curve is obtained by the following equation. In the second embodiment, the reference height of the addition curve = −2 mm. And the position of -2 mm can be read with the addition curve of FIG. 3, and the addition ratio = 15% can be obtained.

(3) Calculation of wearing power A The wearing power A is calculated as follows from the joining ratio after the fitting position is corrected.
Wear frequency A (new) = (− 4.00 + 0.00 / 2) + 2.00 × 0.15 = −3.70D
(4) Evaluation of Viewing Distance X Using the above equation (6), the viewing distance X (new) of new spectacles whose fitting position has been corrected is obtained as follows.
X (new) = 1 / (| −3.70 − (− 4.25-1 / ∞) |)
= 0.182m = 182cm

By configuring as described above, the following effects are achieved in the second embodiment.
(1) When the user 1 wears the previous glasses, the viewing distance when viewed straight was 400 cm, but when the fitting position was corrected 4 mm upward as new glasses, the viewing distance was straight The viewing distance in this case is 182 cm. In this way, even with the same lens, the viewing distance that the user feels can be evaluated by calculating the actual frame position as a parameter.
(2) The visual distance perceived by the user can be evaluated by calculating in consideration of the reference distance and the reference distance frequency.

  The above embodiment is an example in the case where the reference distance C is set to infinity and in the condition where no adjustment occurs. However, in the following embodiment, the reference distance C is an intermediate distance or a near distance. There will be described a case where the viewing distance perceived by the user when there is an adjustment or adjustment occurs is calculated. Of course, the calculation result can be set to be input and displayed on the monitor 13 as in the first embodiment.

(Embodiment 3)
The following embodiment explains various conditions that may be added to the input form as in the first or second embodiment.
In the third embodiment, for the following user 2, the viewing distance when looking slightly below when wearing spectacles framed at the recommended fitting position with the perspective progression having the addition curve shown in FIG. Is an example of calculating Here, when looking slightly below, a line of sight passing through coordinates (Z, Y) = (1.5 mm, −6.0 mm) on the main gazing line is used, and the viewing distance is calculated. In this example as well, the calculation by the formula 2 is performed and the evaluation is as follows.
<Information of User 2 in Embodiment 3>
・ Frequency of spectacles to wear (the same power on the left and right) ... S-4.00 C-0.00 ADD2.00
・ Types of glasses to wear ... Progressive perspective ・ Reference distance C ... 2m
Reference distance power B (intermediate dioptric power): S-3.75 C-0.00
-Visual distance evaluation coordinates (Z, Y) = (1.5 mm, -6.0 mm)

(1) Calculation of joining ratio Since the viewing distance evaluation coordinates are on the main line of sight, the joining ratio is obtained as 53% from FIG.
(2) Calculation of wearing frequency A By the same calculation as in the first and second embodiments, the wearing frequency A is obtained as follows.
Wear frequency A (new) = (− 4.00 + 0.00 / 2) + 2.00 × 0.53 = −2.94D
(3) Evaluation of viewing distance X The viewing distance X is as follows according to equation (2).
X (new) = 1 / (| −2.94 − (− 3.75−1 / 2) |)
= 0.76m = 76cm
With the configuration as described above, the following effects are achieved in the third embodiment.
(1) When the reference distance C is 2 m, the viewing distance that the user 2 feels when the user 2 looks slightly down can be evaluated from the reference distance C, the reference distance B, and the wearing power.
(2) When the reference distance is an intermediate distance, an index at the reference distance is actually shown to the user at a spectacle store or an ophthalmologist, and the reference distance frequency B that the user actually feels preferable at that distance is easily obtained. . In the equation (2), the reference distance C and the reference distance frequency B are parameters, and thus can be applied to such an actual application.

(Embodiment 4)
The fourth embodiment is an example related to a case where the power of hyperopia is set to be weak. When the power is set to be weak in hyperopia, adjustment occurs because the image point (focal point) is formed behind the retina. Therefore, it is preferable to consider the use adjustment force F in the calculation. The information of the user 3 in the fourth embodiment is as follows.
<Information of User 3 in Embodiment 4>
・ Frequency of spectacles to wear (the same power on the left and right) ... S + 4.00 C-0.00 ADD2.00
・ Types of glasses to wear ... Progression in the middle and near (fitting points: 25%)
・ Reference distance C ... 0.5m
・ Reference distance frequency B (near vision frequency) ... S + 7.00 C + 1.00
-Visual distance evaluation coordinates (Z, Y) = (0mm, + 2.0mm)
・ Use adjustment force F ... 0.5D (Diopter)

For the user 3, for example, the calculation of the viewing distance for the line of sight seen straight is performed as follows.
(1) Calculation of addition ratio Since the visual distance evaluation coordinates are (Z, Y) = (0 mm, +2.0 mm) and the intermediate progression, the addition ratio is obtained as 25%.
(2) Calculation of wearing frequency A The wearing frequency A is obtained as follows by the same calculation as in the first to third embodiments.
Wear frequency A (new) = (+ 4.00 + 0.00 / 2) + 2.00 × 0.25 = 4.50
(3) Evaluation of viewing distance X In the fourth embodiment, the viewing distance X is calculated using the above equation (3).
The calculation process of Equation 3 is as follows.
First, (A− (B−1 / C)) = (4.5− (7.0 + 1.0 / 2−1 / 0.5)) = − 1.
It becomes. Therefore, in the two types of formulas (3), the formula taking into account the adjustment force F is used,
Viewing distance X = 1 / (| 4.5− (7.0 + 1.0 / 2−1 / 0.5) +0.5 |) = 2 m = 200 cm

By configuring as described above, the following effects are achieved in the fourth embodiment.
(1) When the reference distance C is a near distance, the viewing distance felt by the user 3 can be evaluated from the reference distance C, the reference distance B, and the wearing power.
(2) By considering the use adjustment power of the user, it can be expected that the visual distance evaluation when the adjustment occurs becomes a value closer to the user's actual feeling. When (A− (B−1 ÷ C)) <0, the image point is connected behind the retina. In this case, if the calculation is performed without considering the adjustment by the crystalline lens, the viewing distance is 100 cm under the condition of the fourth embodiment by the user 3, but the viewing distance is 200 cm as a result of the actual adjustment. I understand. As typical examples of such adjustment, there are a case where the power of hyperopia is set weak and a case where the power of myopia is set stronger than the original power. It should be noted that the value of the adjustment force actually used is preferably used as the use adjustment force F in the equation (3). For example, in the third embodiment, the focal point is moved by 1D behind the retina. Therefore, when the user 3 has a use adjustment force F of 3D, it is assumed that the adjustment force is used by 1D. = Can be evaluated as infinity.

(Embodiment 5)
In the fifth embodiment, the relationship between the use adjustment force F of the fourth embodiment and the posterior image point of the retina is made more specific, and when (A− (B−1 ÷ C)) <0. This is an example of using two types of equations (4). Here, the same calculation is performed for the same user 3 as in the fourth embodiment.
For example, when the use adjustment force F of the user 3 of Embodiment 4 is 0.5D, the discriminant of Equation 4
(A− (B−1 ÷ C)) + F = (4.50− (7.0 + 1.0 / 2−1 / 0.5)) + 0.5
= -0.5 <0
Therefore, X = 200 cm is obtained using the equation of equation (4).
If the use adjustment force F of the user 3 is 3.0D, the discriminant of Formula 4 (A− (B−1 ÷ C)) + F = (4.50− (7.0 + 1.0 / 2−) 1 / 0.5)) + 3.0
= 2.0> 0
Therefore, X = ∞ is obtained using the equation of equation (4).
By configuring as described above, the following effects are achieved in the fifth embodiment.
(1) It is possible to evaluate the visual distance perceived by the user by considering the use adjustment power.
(2) Generally, the remaining adjustment power decreases with age, and is about 3D at 50 years old and about 1D at 60 years old. In actual life, since it is impossible to keep watching with all the adjustment forces, the adjustment force obtained by multiplying the remaining adjustment force by the usage rate (0 to 100%) of the adjustment force is important. Since the remaining adjustment force × use ratio can be used as the use adjustment force F of the fifth embodiment, a viewing distance closer to the user's sense can be obtained even for a complicated optical system in which adjustment occurs. Can do.

(Embodiment 6)
The sixth embodiment is an example of evaluating lens performance by using arbitrary coordinates (Z, Y) as all points on the lens and mapping the visual distance of the entire lens. Here, the user 2 of the third embodiment evaluates the viewing distance when wearing the perspective progression under the conditions of the third embodiment. At that time, in the third embodiment, the evaluation of the viewing distance with respect to a line of sight looking slightly below is performed, but in the sixth embodiment, a large number of arbitrary coordinates (Z, Y) arranged in a scattered manner on the lens. The visual distance is obtained for each, and the mapping is described. In addition, since the amount of calculation increases in the mapping notation, intermediate calculations (the following (1) to (4)) are repeatedly performed by a program inside the computer.
<Information of User 2 in Embodiment 6 (Same as Embodiment 3)>
・ Frequency of spectacles to wear (the same power on the left and right) ... S-4.00 C-0.00 ADD2.00
・ Types of glasses to wear ... Progressive perspective ・ Reference distance C ... 2m
Reference distance power B (intermediate dioptric power): S-3.75 C-0.00
・ Visual distance evaluation coordinates: Arbitrary coordinates on the lens (Z, Y)

(1) Calculation of Joining Ratio Similar to the calculation in the third embodiment, the joining ratio is calculated for arbitrary coordinates (Z, Y). Here, a certain arbitrary locus is calculated.
(2) Calculation of wearing frequency A The wearing frequency A (t1) is obtained from the joining ratio T1 (%) of the coordinates t1 (Z1, Y1).
(3) Evaluation of viewing distance X The wearing power A (t1), the reference distance C, and the reference distance power B are applied to Equation 2 to obtain the viewing distance X (t1) of a certain coordinate t1 (Z1, Y1).
(4) Mapping by repetitive calculation After calculating X (t1), (1) returning to the calculation of the joining ratio, selecting another coordinate t2 (Z2, Y2), calculating the joining ratio T2, and calculating the wearing frequency A ( t2) is calculated, and the viewing distance X (t2) is calculated. Then, (1) returning to the calculation of the joining ratio, another coordinate t3 (Z3, Y3) is selected, and the viewing distance X (t3) is calculated. Then, the viewing distance of the entire lens surface can be calculated by selecting tn (Zn, Yn) in the same procedure and calculating the viewing distance X (tn).
(5) Lens Evaluation Using Visual Distance Calculation Results The visual distance mapping state when the user 2 thus calculated wears the perspective progression is as shown in the distribution diagram of FIG. By calculating the viewing distance in all the areas of the lens as shown in FIG. 6, it is possible to know what viewing distance and what viewing distance when the user 2 wears the lens. Evaluation is possible. For example, from the mapping result of FIG. 6, although the viewing distance is 4 m in a narrow range above the lens, it is about 1.5 m to 2.0 m on the side of the distance portion where the line of sight is slightly shifted from the fitting point in the horizontal direction. I can only see it. Although this perspective progressive lens is supposed to have a relatively wide area where the distance can be seen, it is possible to simulate that the user 2 is not widely aware of as a result of calculating the viewing distance perceived by the user 2.
In addition, the sixth embodiment is an evaluation example of a single lens, but it is possible to perform a comparative evaluation of lens performance with respect to the viewing distance perceived by the user by creating a distribution map of viewing distance for a plurality of lenses. it can.
Conventionally, there has been a method of mapping and expressing optical aberrations on the lens, but there has been a problem that optical aberrations are difficult for the user and not accompanied by real feelings. Since such an evaluation is an evaluation according to the user's actual feeling, there is an advantage that it is easy to explain the lens performance to the user and the user can easily understand.

With the configuration described above, the following effects are achieved in the sixth embodiment.
(1) By using the reference distance C and the reference distance frequency B to evaluate the viewing distance at an arbitrary coordinate (Z, Y) when the user 2 wears the perspective, the viewing distance perceived by the user 2 can be calculated.
(2) Also, by calculating the viewing distance in all areas on the lens as in the sixth embodiment, what viewing distance can be seen by what line of sight when the user 2 wears the lens. Can be evaluated.
(3) The conventional optical aberration evaluation has a problem that it is difficult and unrealistic for the user, but the evaluation using the visual distance distribution map is an evaluation according to the user's actual feeling. On the other hand, the lens performance is easy to explain and the user can easily understand.

(Embodiment 7)
In the seventh embodiment, the relationship between the remaining accommodation power of the fifth embodiment and the age of the user 3 is made more specific. A number of researchers, including Donders, have reported on the decline in regulation with age. In the seventh embodiment, an age obtained by approximating a graph of an average value of the adjusting power for each age a shown in FIG. 7 obtained from the clinical examples of the researchers as a defining expression of the remaining adjusting power by a quadratic function expression. The residual adjustment force was obtained using a quadratic function with a parameter. The equation of the quadratic function is shown as the following equation (10).

In addition, when prescribing a spectacle lens as the usage rate of the adjustment force according to the study by the inventors, it is preferable to assume that half of the adjustment force is used. Therefore, in this example, the usage rate is 50%. It was.
With the above settings, the use adjustment force F is given by the following equation.
F = (0.002 * a * a-0.3756 * a + 1.573) * 0.5
Here, as an example, in the case where the age of the user 3 in the fifth embodiment is 32 years old and 58 years old, the viewing distance X about the line of sight as seen in a straight direction is specifically calculated.
First, from the discriminant of Equation 3,
(A− (B−1 / C)) = (4.5− (7.0 + 1.0 / 2−1 / 0.5)) = − 1.
・ When the age is 32 years old The residual accommodation power in this case is 6.60 (D) according to the formula (10).
Therefore, the use adjustment force F is F = 6.60 * 0.5 = 3.30 (D),
Formula 4 discriminant (A− (B−1 ÷ C)) + F = (4.50− (7.0 + 1.0 / 2−1 / 0.5)) + 3.30 = 2.3> 0
Therefore, the visual distance X = ∞ is obtained.
-When the age is 58 years old The residual adjustment power in this case is 1.52 (D) from the formula (10).
Therefore, the use adjustment force is F = 1.52 * 0.5≈0.76 (D).
Formula 4 discriminant (A− (B−1 ÷ C)) + F = (4.50− (7.0 + 1.0 / 2−1 / 0.5)) + 0.76 = −0.24 <0
The viewing distance X = 1 / | −0.24 |
≒ 4.17m = 417cm
If the configuration as in the seventh embodiment is adopted, the use adjustment force F corresponding to the age can be taken into consideration for the viewing distance X, and a more correct viewing distance X can be obtained.

(Embodiment 8)
In the eighth embodiment, the visual distance X is obtained with emphasis on the dominant eye in the first and second embodiments. In each of the first and second embodiments, the visual distance X is calculated by the average value of the numerical values obtained for the left and right eyes (that is, the weight of the left and right eyes is 50:50), and the distance is displayed as the color line segment 32. It was. However, since a person mainly uses either the left or right eye as a “dominant eye”, it is preferable to calculate the viewing distance X by giving a weight to the dominant eye side rather than treating the left and right viewing distance X equally. .
Therefore, let the wearer decide in advance the dominant eye and give weight to the dominant eye.
A number of methods for determining the dominant eye have been proposed, but here we first introduce a conventional method.
1) The tip of the left and right index fingers and the tip of the left and right thumbs are put together to form a triangular zone surrounded by these fingers. Then, a distance of about 3 to 4 m is taken, and, for example, a human face, a table clock, a photo frame, or the like is taken as an object in the triangular zone, and the object is visually observed so as to be contained.
2) First, look at the object in the triangular zone with both eyes open.
3) Next, look at the right eye with only the left eye closed.
4) Next, look at the left eye with only the right eye closed.
5) As a result, when viewed in either 3) or 4), the object disappears (or is largely missing) from the triangular zone. That disappearing eye is the non-dominant eye. This utilizes the fact that when a person visually observes an object, the appearance on the dominant eye side is used as a reference.
FIGS. 8A and 8B are examples of the index 41 for checking the dominant eye added to the input form of the first and second embodiments and the form 42 for inputting the dominant eye, for example. The wearer visually observes this index according to the above 1) to 5), examines his / her dominant hand, and inputs it into the form 42. In the eighth embodiment, since the program for giving the left and right eye weights as shown in FIG. 9 is set, the viewing distance X is calculated in consideration of the left and right eye weights based on the input to the form 42, The viewing distance X is displayed corresponding to the color line segment 32. By default, the program calculates the left and right eye weights at 50:50.

It should be noted that the present invention can be embodied with the following modifications.
In the visual distance display form 21 of the first embodiment, the icon of the list box 24 for selecting one (previous glasses) from a plurality of products is displayed, but the type of lens in the list box 24 is changed as appropriate. And can be set.
In the visual distance display form 21 of the first embodiment, information on two types of lenses of middle and near progression and near and middle progression is displayed in advance as “new glasses”, and this power is input. It may be an aspect that is arbitrarily selected from products.
In the first embodiment, by inputting the expert adjustment button 34, a numerical value obtained by correcting the calculated value in the range of S ± 0.25 can be obtained, but other numerical values can be adopted, You may make it calculate by operating a keyboard and inputting arbitrary numerical values.
The information input to the viewing distance display form 21 is S frequency, C frequency, ADD, and AX, but is not limited to this and may be in other modes. For example, S + C / 2 may be input.
In the viewing distance display form 21 of the first embodiment, a scale is displayed in the drawing area 31B, and the image of the arc-shaped color line segment 32 is displayed on the scale at a position corresponding to the viewing distance. However, such a mode is merely an example, and other modes, for example, an icon other than the color line segment 32 or an animation can be used.
In the above, the client accesses the server 15 and calls the WEB page on which the viewing distance display form 21 is displayed. However, the viewing distance display form is used on the client side computer by using or downloading a storage medium. 21 may be displayed and the viewing distance may be calculated by the calculation program.
A system in which a spectacle store registered on the server 15 side is recognized and data can be transmitted only to a specific terminal computer 11 and the calculation result of the viewing distance can be viewed only by the monitor 13 of the terminal computer 11 But you can. In other words, the system may be used only by the contracted party.
In addition, when a forward tilt angle, a warp angle, and a vertex distance are set in the spectacle lens, it is preferable to calculate the viewing distance in consideration thereof.
・ In the above, use adjustment power, age, weight of dominant eye, etc. were listed as parameters for calculating viewing distance, but as eye information of the user, eyeball elements such as pupil diameter, axial length, rotation angle, etc. Can be obtained, the viewing distance can be calculated using the information as a parameter. When frame elements such as a warp angle, a forward tilt angle, and a distance between vertices (PD) can be acquired, the viewing distance can be calculated using the information as a parameter.
After calculating the viewing distance according to the present invention, it is possible to further calculate the degree of blurring at the viewing distance using information on astigmatism components at each point of the lens. Since the present invention is a starting point for the calculation calculation, the present invention also includes a case where the visual distance is further evaluated after the visual distance calculation using the present invention.
The display of the viewing distance display form 21 on the monitor 13 of the first and second embodiments and the contour lines of the mapping notation of the sixth embodiment can also be displayed as a three-dimensional graphic. In addition, when the contour lines are displayed three-dimensionally, the distance scale may be expressed logarithmically.
-Besides, it is free to implement in a mode that does not depart from the gist of the present invention.

  13: Monitor, 25-27: Box as an input screen, 15: Server for calculating viewing distance and displaying it on the monitor screen.

Claims (24)

A method for calculating a viewing distance in a line-of-sight direction that passes through certain coordinates of the spectacle lens when the spectacle lens is worn,
When the wearing power at an arbitrary coordinate on a spectacle lens of a user is A (diopter) and the user sees a certain distance (hereinafter, such a distance is referred to as a reference distance), the user sees the reference distance. When the frequency that can be focused on C (hereinafter, such frequency is referred to as a reference distance frequency) is B (diopter), the value obtained by the following formula passes through an arbitrary coordinate of the spectacle lens. A method for calculating a viewing distance of a spectacle lens, wherein the viewing distance X is obtained as a viewing distance X in a viewing direction.
  2. The spectacle lens according to claim 1, wherein the reference distance frequency B is a frequency that the user perceives as suitable for focusing on the reference distance C when the user views the reference distance C. Visual distance calculation method.   3. The spectacle lens viewing distance calculation method according to claim 1, wherein the wearing power is represented by an equivalent spherical power. The viewing distance calculation method for a spectacle lens according to any one of claims 1 to 3, wherein the viewing distance of the spectacle lens represented by Formula 1 is expressed by the following mathematical formula.
The viewing distance X of the eyeglass lens is (A− (B−1 ÷÷) when the adjustment force used by the user when viewing the same viewing distance X is F (diopter, hereinafter referred to as “use adjustment force”). The viewing distance calculation method of the spectacle lens according to claim 4, wherein the visual distance is expressed by the following mathematical formula according to C)).
When the viewing distance X of the spectacle lens is (A− (B−1 ÷ C)) <0, the use adjustment force F used when viewing the viewing distance X and (A− (B−1 ÷ C) are used. The method for calculating the viewing distance of a spectacle lens according to claim 5, wherein:
  Define the residual accommodation power that decreases with increasing age as a function of age as a parameter, and set the use accommodation power F of the wearer in consideration of the remaining accommodation power corresponding to the age of the wearer. The viewing distance calculation method for spectacle lenses according to claim 5 or 6.   The method for calculating a viewing distance of a spectacle lens according to any one of claims 1 to 7, wherein the reference distance power B is a far vision power and the reference distance C is a far distance.   8. The spectacle lens viewing distance calculation method according to claim 1, wherein the reference distance power B is an intermediate diopter power and the reference distance C is an intermediate distance of 1 m to 4 m.   8. The spectacle lens viewing distance calculation method according to claim 1, wherein the reference distance power B is a near vision power and the reference distance C is a near distance of 20 cm to 80 cm.   The spectacle lens is a progressive addition lens in which an addition gradient is set so that the power is gradually added in the plus direction from the distance portion region to the near portion region, and the wearing power A at an arbitrary coordinate is set. The eyeglass lens viewing distance calculation method according to any one of claims 1 to 10, wherein an addition power corresponding to the addition ratio in the coordinates is added to the eyeglass lens.   12. The spectacle lens viewing distance calculation method according to claim 1, wherein the arbitrary coordinates are distance fitting point positions. When the wearing power of a user's spectacle lens is A (diopter) and the reference distance power that the user can focus on when viewing the reference distance C is B (diopter), the wearing power A and An input screen display means for displaying an input screen prompting the user to input a numerical value of the reference distance frequency B on the monitor screen;
Calculation means for performing calculation according to the visual distance calculation method for a spectacle lens according to any one of claims 1 to 12, using the wearing power A and the reference distance power B input on the input screen;
A viewing distance display means for displaying on the monitor screen the distance calculated when the value calculated by the calculating means is viewed with a line of sight passing through the coordinates of the spectacle lens;
A viewing distance display device for eyeglass lenses, comprising:   The input screen display means displays on the monitor screen an input screen prompting the user to input numerical values of a plurality of types of wearing power A and reference distance power B corresponding to a plurality of types of spectacle lenses, and the viewing distance display means 14. The eyeglass lens viewing distance display device according to claim 13, wherein a plurality of values calculated by the calculating means are displayed on the monitor screen as viewing distances of the plurality of types of eyeglass lenses.   The calculation means calculates a ratio of a viewing distance of the plurality of types of spectacle lenses based on one viewing distance, and the viewing distance display means displays the ratio on the monitor screen. Item 15. The eyeglass lens viewing distance display device according to Item 13 or 14.   The input screen display means displays a correction input screen for prompting correction of the power at the distance power measurement position on the monitor screen, and when there is an input to the correction input screen, based on the input information, A first correction frequency is given to the frequency at the usage frequency measurement position to correct the frequency at the distance frequency measurement position, and a second correction with the same absolute value as the first correction frequency but with a plus or minus sign is different. The eyeglass lens viewing distance display device according to any one of claims 13 to 15, wherein the power is given to the addition power and the calculation by the calculation means is performed.   The input screen display means displays on the monitor screen a correction input screen that prompts input of the correction amount of the frame position, and when there is an input to the correction input screen, based on the input information, the wearing frequency The method for displaying a viewing distance of a lens according to any one of claims 13 to 16, wherein A is changed in accordance with the addition ratio of the corrected vertical position to perform calculation by the calculation means. .   18. The eyeglass lens viewing distance display device according to claim 13, wherein the arbitrary coordinates are distance fitting point positions.   The spectacle lens according to any one of claims 13 to 18, wherein the viewing distance display means displays the distance on the monitor screen with a length corresponding to the numerical value calculated by the calculation means. Viewing distance display device.   The viewing distance displayed on the monitor screen by the viewing distance display means is calculated by giving a weight to the dominant eye side of either the right eye or the left eye of the wearer. A viewing distance display device for spectacle lenses according to claim 19.   21. The eyeglass lens viewing distance display device according to claim 13, wherein the monitor screen is displayed in a three-dimensional manner.   The input screen is disclosed on the WEB page, and a value calculated based on the numerical data of the wearing power A and the reference distance power B input on the input screen is used as a viewing distance of the spectacle lens on the WEB page. The eyeglass lens viewing distance display device according to any one of claims 13 to 21, wherein the eyeglass lens viewing distance display device is displayed.   The spectacle lens evaluation method according to claim 1, wherein a visual distance at each point of the spectacle lens is calculated, and the spectacle lens is evaluated based on the visual distance.   The viewing distance at each lens point of the spectacle lens is calculated, the viewing distance is displayed on the monitor screen, the spectacle lens is evaluated using the viewing distance display result, and the result is displayed on the monitor screen. The eyeglass lens viewing distance display device according to any one of claims 13 to 22, wherein the eyeglass lens viewing distance display device is configured.