JP4059274B2 - Progressive multifocal lens manufacturing equipment - Google Patents

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus for a progressive multifocal lens for correcting vision, a progressive multifocal lens and a spectacle lens manufactured by the manufacturing method.

  A progressive multifocal lens is a lens having two field parts having different refractive powers and a field part in which the refractive power changes progressively between them. Furthermore, a field of different refractive power can be obtained with one lens. For this reason, it is often used as a spectacle lens having a vision correction function such as presbyopia. In many progressive multifocal lenses, a far-field portion, which is a visual field portion for viewing an object at a long distance, is provided above, and a visual field portion having a refractive power different from that of the far-field portion is used to view an object at a short distance The near portion is provided below the far portion. The distance portion and the near portion are smoothly communicated by a progressive portion which is a visual field portion having a refractive power that continuously changes so as to see an object at an intermediate distance between the long distance and the short distance. Therefore, even a user who has advanced presbyopia and the ability to adjust has decreased, by using glasses using a progressive multifocal lens, a clear visual field can be obtained focusing on both far and near. . Further, since the refractive power gradually changes between the distance portion and the near portion, a comfortable visual field can be obtained even at an intermediate distance. Therefore, the progressive multifocal lens is favored by many users as a spectacle lens, and will be adopted by many users in the future.

  The progressive multifocal lens has at least two regions having different refractive powers, and has a progressive surface in which these are continuously connected by a progressive portion. Therefore, since this progressive surface is not a single spherical surface, curvatures in two orthogonal directions are different in at least one region of the progressive surface, thereby causing astigmatism. However, for example, a user (user) of eyeglasses without astigmatism does not perceive image blur so much if the astigmatism appearing on the lens is 1.0 diopter, preferably 0.5 diopter or less. A clear vision can be obtained. Therefore, it can be said that a progressive multifocal lens having a wide area (clear vision area) where clear vision can be obtained in the distance portion is desirable for drivers and sports enthusiasts who often see far away. On the other hand, a progressive multifocal lens with a wide clear visual field in the near portion is desirable for users who are interested in clerical work or knitting who often have a chance to look close. As described above, in the progressive multifocal lens, it is desirable that the lens performance according to the eyesight of the user is changed, and it is desirable to change the lens performance depending on the use of the glasses.

  Furthermore, the movement of the eye from a distance to the vicinity is accompanied by a movement (convergence) in which the eyeball approaches the nose side. For this reason, it is desirable that the main gazing line (main meridian) extending from the distance portion toward the near portion is bent slightly toward the nose side in consideration of the convergence of the eyes. It is desirable to arrange a clear vision area. Since the amount of convergence varies depending on the user, a clear visual field cannot be obtained sufficiently unless the progressive multifocal lens has a clear vision area suitable for the user. In addition, there are several factors that influence the matching between the progressive multifocal lens and the user, such as the rotation angle and the length of the progressive zone.

  As described above, when a user tries to obtain a comfortable visual field, it is necessary to select a progressive multifocal lens in consideration of the above-described points.

  Conventionally, as shown in FIG. 14, a basic type progressive multifocal lens in which progressive surfaces of several average optical characteristics are formed on the convex side is prepared by the manufacturer, and among these, suitable for the user. The system that selects the lens that seems to be, and processes the concave side according to the power of the user is adopted. The outline process until the progressive multifocal lens is shipped to the user will be described. First, in step 91, the manufacturer places importance on several types, for example, distance use and medium use, depending on the user's average use and eye movement. Set a progressive surface suitable for lenses, lenses that focus on near and medium use, and lenses that are balanced for far, medium, and near use, and lenses with the progressive surface formed on the convex side. Process. In step 92, an inventory of processed semi-finished lenses is prepared.

  As shown in step 93, the user obtains information about the eye such as power, astigmatism, or vergence or rotation angle at a spectacle store, and further determines the use of the spectacles. In step 94, the user selects the semi-finished lens. Choose the lens that you think is most suitable. The task of selecting an appropriate lens from these semi-finished lenses often requires specialized knowledge, so it is often performed at dealers and manufacturers, and software for selection may be prepared. is there.

  In step 95, the concave side of the selected lens is processed to a power suitable for the user including astigmatism correction, and the lens is shipped in step 96. At the time of processing, the processing shape is determined according to the spectacle frame selected by the user, and a color coat or the like is added if requested. Through such a process, a lens suitable for the user is selected from the product group prepared by the manufacturer and delivered to the user. Further, by examining the user information obtained in step 93 in more detail, it is possible to provide a lens that can provide a comfortable visual field that matches the user's requirements from among the product group prepared in a semi-finished state. .

  In order to select a product that matches the user, it is necessary to have a semi-finished lens in stock that can handle the user's request. However, in order to keep the number or quantity of types that can be stocked within an appropriate range, the types that can be manufactured as semi-finished products are limited, and the average and high demand for outdoor types as described above is important. However, it is limited to several types such as a general-purpose type far / middle / near balance and an indoor type middle / middle focus. Therefore, the user can only select the most suitable kind of progressive multifocal lens prepared, and cannot always wear the optimum lens.

  Therefore, an object of the present invention is to provide a manufacturing method and a manufacturing apparatus that can provide an optimal progressive multifocal lens to an individual user suitable for the user's life, eye condition, or movement. In particular, progressive multifocal lenses provide a clear field of view even when the ability to adjust visual acuity declines, but on the other hand, the refractive power of each part of the lens differs and the area obtained as a clear vision area is limited. End up. Therefore, the usage environment varies depending on each user depending on the purpose of use of the glasses, past history, eye condition, movement, etc., and it is not possible to provide the same progressive multifocal lens optimally for multiple users. Is possible. Therefore, an object of the present invention is to provide a progressive multifocal lens having a progressive surface adapted to the eye movement and life of each individual user, and each user with different usage environment is always comfortable. An object of the present invention is to provide a spectacle lens capable of obtaining a field of view.

  In the progressive multifocal lens manufacturing apparatus according to the present invention, which has a progressive surface that forms a distance portion and a near portion having different refractive powers, and a progressive portion in which the refractive power changes progressively therebetween, Designing a progressive surface that reflects user-specific customization information including at least one of information related to the user's eye and information related to the user's life, and a progressive multifocal lens with this custom-made progressive surface It has a lens design section that derives processing data. The lens design unit includes a design parameter determination unit that reflects customization information in the design parameters of the progressive surface, a coordinate data derivation unit that derives coordinate data of the progressive surface custom-made based on the design parameters, and a custom-made lens design unit. A lens shape determination unit that determines the shape of a custom-made lens with a progressive surface based on customization information, an optical performance correction unit that corrects the shape of the custom-made lens based on customization information so that optical performance is improved, and correction A processing data creation unit that derives processing data for the shape of the custom-made lens that has been created, and a basic parameter in which a plurality of basic parameters relating to the setting of the clear vision area of at least the distance portion or the near portion are prepared in advance among the design parameters File and distance or near distance corresponding to these basic parameters A frequency distribution data file frequency distribution is prepared in advance of the base curve to set the surface power of the distance portion is provided with a plurality of types previously prepared base curve file.

Furthermore, the design parameter determination unit selects a basic parameter from the basic parameter file based on each of at least first and second main life information of different categories related to the user's life included in the customization information. And
Designing a custom-made lens from a plurality of basic parameters selected by the basic parameter selection unit based on the sub-life information reflecting the ratio that the first and second main life information included in the customization information affects the eyes of the user A basic parameter adjustment unit that determines the basic parameters to be used, a base curve selection unit that selects base curves for the distance and near parts from the base curve file based on the frequency information included in the customization information, and frequency distribution data A first frequency distribution determining unit that determines the frequency distribution of the distance portion or the near portion based on the frequency distribution data of the file, and a first frequency distribution determining portion that determines the frequency distribution of the progressive portion based on the frequency distribution of the distance portion and the near portion. 2 frequency distribution determination unit. In addition, the design parameter determination unit also includes information on the user's spectacles included in the customization information, whether there is any experience in using spectacle lenses, suitability for progressive multifocal lenses, and current or past wearing A basic parameter correction unit that corrects basic parameters based on history information regarding suitability for glasses can be provided.

  As described above, in the present invention, a progressive surface reflecting the customization information of each user is custom-made, and a progressive multifocal lens with the custom-made progressive surface is designed to be optimal for each user. It is possible to make custom-made eyeglass lenses. Therefore, it is significantly different from selecting from several types of lenses with basic optical characteristics appropriately set by the manufacturer, as in the past, and progressive images with optimal optical characteristics for individual users. A focus lens can be created and provided. Therefore, users can purchase the most suitable eyeglass lenses that incorporate their own eye condition and lifestyle, and even their own claims, rather than selecting from among eyeglass lenses on the market. Get a very comfortable view and enjoy your life.

  Furthermore, by employing the manufacturing method of the present invention, it is possible to eliminate the labor and cost of processing and stocking a semi-finished lens. For this reason, the optimal spectacle lens for the user can be provided at low cost.

  Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 shows a main process of the method for manufacturing a progressive multifocal lens according to the present invention using a flowchart. In order to manufacture the progressive multifocal lens of the present invention, it is first necessary to collect user-specific information (customized information) 1. In order to manufacture a custom-made progressive multifocal lens suitable for a user, it is desirable to roughly obtain information related to the user's eyes and information related to the user's life. Information relating to the eye includes frequency (S frequency, C frequency and axis if astigmatism needs to be corrected), addition indicating the difference in power between the distance portion and the near portion, pupil indicating the position of the pupil The distance, the amount of convergence that is the movement of the eye from the distance portion to the near portion, the rotation angle indicating the range in which the eyeball rotates (line-of-sight movement), the line-of-sight movement, and the like. Furthermore, as fitting data when wearing spectacles, the distance between the corneal apex, which is the distance between the eyeball side surface of the lens and the cornea, the forward tilt angle indicating the angle between the face normal and the lens surface, the tilt between the left and right lenses Can be included. Information on these eyes can be obtained mainly by measuring the movement of the user's eyes at an ophthalmologist or a store.

  On the other hand, information related to the user's life includes life information related to the main use of the eyeglasses such as the user's work and hobbies, compatibility / preference with eyeglasses worn now or in the past, and presence / absence of eyeglasses experience And the like, and further, the frame shape for the glasses selected by the user. Information related to the life of these users can be obtained mainly in an ophthalmology department or a store by an interview or questionnaire.

[Outline of manufacturing method of progressive multifocal lens]
In the progressive multifocal lens manufacturing method 10 of this example, a design step 2 for designing a progressive multifocal lens including a progressive surface reflecting the customization information 1 collected as described above and deriving processing data; A processing step 3 for manufacturing progressive multifocal lenses and spectacle lenses based on the processing data and a step 4 for shipping custom-made lenses according to the user are provided. For this reason, the customization information 1 of this example is not information for selecting a lens suitable for the user from ready-made eyeglass lenses, but information used for manufacturing a progressive multifocal lens.

  Therefore, it is necessary to reflect on the design parameters later, but it is not information for deriving any one answer, that is, any one of the ready-made lenses, so that the user can obtain a comfortable view using glasses. You can include any kind of information that you think is relevant to. In addition, in the manufacturing method of this example, it is possible to manufacture a custom-made progressive surface starting from the design of the progressive surface based on the customization information and a custom-made lens having the progressive surface.

  Therefore, it is possible to provide a spectacle lens corresponding to each of a wide variety of users, and it is possible to provide a spectacle lens that always provides a comfortable visual field for each user.

  Further, in the manufacturing method of this example, a lens that can be shipped can be manufactured immediately in one process by processing the lens based on the processing data derived based on the customization information. Therefore, a process for manufacturing a conventional semi-finished lens is unnecessary, and a custom-made lens suitable for the user can be provided in a short time. Further, since it is not necessary to stock a lens in a semi-finished state, the cost can be reduced in this respect. And, since the design is made from the progressive surface based on the customization information, if there is a progress in the technology that improves the performance of the progressive multifocal lens, the design software can be upgraded to upgrade the technology. Accordingly, it is possible to provide a progressive multifocal lens with improved performance to the user. In addition, even if the user renews the design or changes the lens specifications, it is not necessary to change the information supplied to the manufacturer (lens manufacturer), including new and old types or types with different purposes. The troublesomeness of selecting an appropriate lens from a wide variety of lenses can be eliminated.

  Each process included in the design process 2 of this example will be described in more detail. The design process 2 of this example is a design parameter determination process 5 that reflects information related to the design of the progressive surface from the customization information 1 to the design parameters, and the progressive surface is designed based on those design parameters. Step 6 for deriving the coordinates of the lens, Step 7 for determining a lens shape having a custom-made progressive surface based on customization information 1 such as a frame shape, and the progressive surface and lens shape set above are customized information. 1 includes a step 8 of correcting so as to optimize the optical performance based on the fitting data included in 1 and a step 9 of creating processing data of the lens determined in this way.

[Outline of Progressive Multifocal Lens Manufacturing Equipment]
The method of manufacturing a progressive multifocal lens of the present invention having such steps can be provided as software, and can be supplied by being stored in a storage medium such as a magnetic disk or a CD-ROM. A processing device having an appropriate processing function such as a personal computer and a function of storing a file or the like can be used as the progressive multifocal lens manufacturing device 60. The main configuration of the manufacturing device is shown in FIG. It is shown. The manufacturing apparatus 60 of this example corresponds to each of the above-described steps 5 to 9, a design parameter determination unit 61 that determines design parameters for a custom-made lens by determining design parameters for a custom-made lens, and a custom parameter A coordinate data deriving unit 62 for deriving the coordinates of the made progressive surface, a lens shape determining unit 63 for determining a lens shape suitable for each user based on customization information such as the coordinates and the frequency, and a user included in the customization information And an optical performance correction unit 64 that corrects a custom-made lens shape based on individual fitting information so as to optimize the optical performance, and further for lens processing from the coordinate data thus determined. Is provided with a machining data creation unit 65 for deriving the numerical data. The manufacturing apparatus 60 of this example also includes a file group in which various data created in advance are stored. For example, a basic design type (basic parameter) file 51 in which a fine combination of distance vision / near vision areas (basic parameters) is defined in advance, and the surface refractive power of the curved surface is given by the user's spherical power and astigmatism power A base curve file 53 prepared so that an optimal basic curve (base curve) can be set, and a distance part frequency distribution prepared so that a horizontal frequency distribution of the distance part and the near part can be obtained by basic parameters. A file 54 and a near part frequency distribution file 55 are provided. The data stored in these is used for processing in the design parameter determination unit 61, so that a variety of progressive surfaces different for each user can be designed in a short time.

  The coordinate distribution of the progressive surface determined by the design parameter determination unit 61 is output to the coordinate distribution data file 81, and the coordinate data derived by the coordinate data deriving unit 62 based on this coordinate distribution data is output to the coordinate data file 82. . The lens shape determination unit 63 determines the lens shape based on the coordinate data in the coordinate data file 82 and values selected from the lens diameter file 57, the minimum center thickness file 58, and the minimum edge thickness file 59 based on the customization information. The numerical data shown is output to the lens shape file 83. The optical performance correction unit 64 corrects the shape of the lens shape file 83 based on the optical characteristics, and the processing data creation unit 65 derives the processing data from the numerical data indicating the corrected lens shape and outputs the processing data to the processing data file 84. To do. This processing data is transferred to an NC machine or the like, and an optimal spectacle lens is molded for each user and supplied to the user.

  In the following, a more detailed description of each process of the manufacturing apparatus and the above-described progressive multifocal lens manufacturing method will be described with reference to the flowcharts of the processes shown below.

[Outline of design parameter determination process]
As shown in FIG. 3, the design parameter determination process 5 for reflecting the customization information 1 of this example in the design parameters is a rough processing step, as shown in FIG. 3, for basic parameters for distance / near use regarding the basic performance of the progressive multifocal lens. Step 14 for determining the distance curve, step 14 for determining the power distribution (refractive power) of the distance portion according to the basic parameters by obtaining a base curve, step 18 for determining the frequency distribution of the near portion according to the basic parameters, And step 22 for determining the frequency distribution of the progressive portion based on the distribution of. Corresponding to these, the design parameter determination unit 61 of the manufacturing apparatus 60 of the present example also includes the basic parameter setting unit 66 that performs the processing of step 11, and the base curves of the distance portion and the near portion in step 14 and step 18. A base curve selection unit 67 that performs setting, a first frequency distribution determination unit 68 that determines the frequency distribution of the distance portion and the near portion, and a frequency distribution that determines the frequency distribution of the entire progressive surface based on these frequency distributions. 2, and the determined frequency distribution is output to the frequency distribution data file 81.

  In the progressive multifocal lens manufacturing method of this example, first, in step 11, the basic region of the progressive multifocal lens is set. For this purpose, the basic information of the distance portion and the near portion is determined in step 12 based on information related to the lifestyle 1a of the customized information 1 (occupation, hobby, place / range of activity, type and evaluation of past glasses, etc.). Determine location and size. In this example, a progressive surface and a progressive multifocal lens customized for each user are designed by computer processing, and processing data is derived so that the design processing can be performed in a short time. In addition, by adopting computer processing, it is possible to select the most suitable one from a large number of parameters in a short period of time, and to quickly cope with even complex functionalized design parameters. Progressive surfaces and progressive multifocal lenses can be provided. In step 12 for selecting basic parameters for determining the positions and widths of the distance portion and the near portion, several tens or more basic design types (basic parameters) are previously set as basic design type files (basic parameter files) 51. The basic design type that matches the lifestyle information 1a is selected from among them, and, for example, as shown in FIG. 13, the distance area boundary line in the progressive surface area 71 of the progressive multifocal lens 70 72a is set to determine the position and size of the distance portion 71. Unlike selecting an appropriate lens from several conventional semi-finished lenses, in the manufacturing method of this example, since it is an initial stage of designing the progressive surface 71, several tens or more basic patterns are used. A fine selection is possible. For example, it is possible to freely change the position and angle of the distance portion region boundary line 72a, and also the curvature, etc., and thereby the position and the width of the distance portion can be freely set.

[Basic parameter setting method]
FIG. 4 shows a more detailed process flow of step 12, which is a process of setting the basic parameters of this example. In the manufacturing method of this example, when setting the width of the clear visual field in the near and far, the basic parameters of the glasses suitable for each user in order to obtain a comfortable visual field for the user, information related to life It can be set with. As information related to life for setting basic parameters, as described above, it is possible to select occupations and hobbies (hereinafter referred to as main life information) closely related to the purpose of use of the glasses. Furthermore, in the manufacturing method of this example, the basic parameters are not set with the information of one category of the main life information, but the individual user's life situation (lifestyle) is captured from different aspects. Basic parameters are selected based on the main life information of multiple categories so that the most suitable eyeglass lenses can be supplied. For example, in the present example, occupation information 1a. 1 is selected and the occupation information 1a. 1 makes it possible to select the first basic parameter. Also, as main life information of the second category, hobby information 1a. 2 and the hobby information 1a. 2 makes it possible to select the second basic parameter.

  In the progressive multifocal lens manufacturing method of the present invention, the progressive surface design can be performed in response to individual users, so that a wide variety of progressive multifocal lens patterns can be prepared as basic parameters. . FIG. 5 shows an example of basic parameters prepared in the basic parameter file 51 of this example. In this example, the width of the horizontal clear vision area (aberration 0.50D or less) of the distance portion at the fitting point 7 mm above the upper end of the progressive zone is set at a pitch of 5 mm from 5 to 50 mm. The width of the clear visual region in the horizontal direction of the near portion 3 mm below the lower end is set at a 2 mm pitch from 2 to 20 mm, and these combinations are used as basic patterns (basic parameters) of the basic progressive surface. Accordingly, basic parameters indicating 100 types of progressive surfaces are prepared in advance in the basic parameter file 51. In FIG. 5, those that can be classified into types that place importance on the middle visual field are “middle”, those that can be classified into types that place importance on the far field, “far”, and those that can be classified into types that place importance on the far field. Those that can be classified into types that focus on “far” and “middle and near vision” can be classified into “middle and near”, those that can be classified into types that balance far, middle and near, “rose”, and those that can be classified into types that emphasize near vision Can be classified into types that place importance on near vision and perspective, and are grouped under the name “perspective” as basic parameters. Of course, basic parameters are limited to these names and classification criteria. It is not a thing.

  Data corresponding to these basic parameters and occupations are prepared in advance in the occupation file 52a shown in FIG. For example, if the results of past sales of eyeglass lenses show that a progressive multifocal lens with a clear vision area of 20 mm for the distance and 10 mm for the near is generally desirable, the lawyer's occupation Is assigned a basic parameter of middle four. Similarly, for doctors, the result is that a progressive multifocal lens with a clear vision area of 30 mm for the distance and 12 mm for the near is generally desirable. Is assigned. Accordingly, in step 12a, basic parameters suitable for the user's occupation can be set with reference to the occupation file 52a.

  Furthermore, in the manufacturing method of the multifocal lens of this example, a hobby file 52b shown in FIG. 7 is also prepared. For example, when the hobby is driving, if a progressive multifocal lens having a clear vision area of 50 mm for the distance portion and 2 mm for the near portion is generally desirable, the basic parameter of distance 2 is obtained. Assigned. Accordingly, in step 12b, basic parameters suitable for the user's hobby can be set with reference to the hobby file 52b. The basic parameters shown in FIGS. 6 and 7 are, of course, merely examples, and are set based on past sales results of eyeglass lenses and subsequent tracking surveys.

  Thus, in the progressive multifocal lens manufacturing method of this example, even if the occupation is the same, the purpose of use of the glasses and the required position and width of the field of view differ depending on the individual user. It is supplemented by main life information in another category of hobbies, so that it is possible to provide an optimal progressive multifocal lens for each user.

  For example, a user whose occupation is a doctor and whose hobby is golf obtains medium 13 as the first basic parameter in step 12a, and distance 2 as the second basic parameter in step 12b. These basic parameters are design parameters indicating different types of progressive surfaces, and a custom-made progressive surface cannot be designed as it is. Therefore, in the manufacturing method of this example, as shown in FIG. 3, the ratio that the user spends on occupations and hobbies is included in the customization information 1 as lifestyle data. For example, if the ratio of golf, which is a hobby, is about once a month, it can be determined that the frequency of using the distance portion is low, so that the minimum required clear vision area is based on the first basic parameter related to occupation. It can be set to a basic parameter that can secure a rose 4 in which only the use portion is raised by two ranks, that is, a clear vision area of the distance portion 40 mm and the near portion 12 mm.

  For this reason, a basic parameter adjustment process for adjusting the first and second basic parameters set in steps 12a and 12b is provided in step 12c.

  In addition, users who have been wearing eyeglasses for many years will be able to reduce the field of view when the clear vision area of the new spectacle lens is large compared to the clear vision area of the spectacle lens that was previously worn. Not only the range but also the aberration distribution in the progressive part is greatly different, and a sense of incongruity tends to occur. On the other hand, when there is dissatisfaction such as a narrow field of view, the spectacle lens that removes this dissatisfaction is desirable. For users who are wearing a progressive multifocal lens for the first time, there are many concerns about the field of view and image distortion that are unique to progressive lenses. Therefore, a spectacle lens that emphasizes distance use with a wide clear vision area is desirable. As described above, the spectacle lens specifications that are optimum may differ depending on the user's spectacle history. Therefore, in the manufacturing method of this example, as shown in FIG. Information 12k is provided, and a basic parameter correction step for correcting the basic parameter set in step 12c with the history information 1k is provided in step 12d.

  Corresponding to these steps 12a to 12d, basic parameters corresponding to occupation are set from the occupation file 52a in the basic pattern setting section 66 of the progressive multifocal lens manufacturing apparatus 60 of this example shown in FIG. The first basic parameter setting unit 66a, the second basic parameter setting unit 66b for setting basic parameters corresponding to the hobby from the hobby file 52b, and the basic parameters used for the design of the progressive surface according to the ratio of occupation and hobby And a basic parameter correction unit 66d for correcting the basic parameter according to the user's history.

[Correction of distance and near parts]
Next, in step 13, the rotation angle 1b and the amount of convergence 1c included in the customization information 1 or the usage of the user's line of sight from the distance to the near distance is used to determine the distance and near areas set according to the basic parameters. Correct the height and position. In this example, the length of the progressive zone, the progressive zone shape, and the addition change rate in the progressive zone are obtained by the customization information 1 described above, and thereby the near portion is finally positioned.

  The rotation angle 1b can be included in the customization information 1 by measuring, for each user, the maximum value (maximum rotation angle) that can be rotated downward based on the horizontal line of sight. When the distance from the rear surface of the spectacle lens to the rotation center of the eyeball is 25 mm, the position of the line of sight when the maximum rotation angle A is used can be approximately 25 × tan (A) mm on the lens. For example, when the maximum rotation angle A is 40 °, the line of sight can be moved from the horizontal line of sight to about 20 mm below on the lens surface. Therefore, it is desirable to set a near-use area that is frequency-stable at a position 20 mm below. For this reason, the near start point (the lower end of the progressive zone) is set about 17 mm below the position of the horizontal line of sight that is about 3 mm above the lens center. Also, the normal user's line of sight is often about 5 to 6 degrees below the horizontal line of sight, and this is called the normal line of sight, but considering this, the progressive start point is set about 2 mm below the horizontal line of sight. Therefore, for a user having such a maximum turning angle A, the near portion is positioned as described above, and the length of the progressive zone length is set to 15 (17-2) mm.

  Conventionally, the convergence amount 1c is set to a general value of approximately 2.5 mm per eye on the lens, but the convergence amount 1c actually differs for each user depending on the movement of the eye muscles and the adjustment force. Furthermore, it may be desirable to change the amount of convergence on the left and right for users who have a habit of tilting their heads when looking closely. In this case, set the near-use part at different positions with the left and right eyeglass lenses. It is desirable. The amount of convergence 1c of each user can be measured, for example, by how much mm the position of the near line of sight is on the inner side (nose side) with respect to the position of the distance line of sight. In the progressive multifocal lens manufacturing method of this example, the progressive surface is designed for each individual user. Therefore, the eye movement and eye movement for each user are reflected, and the left and right eyes are different. It is possible to provide a spectacle lens having a progressive surface that takes into account the amount of convergence.

  In this way, based on the rotation angle 1b and the amount of radiation 1c indicating the movement when the line of sight moves from far-distance to near-distance for each user, as shown in FIG. It is possible to set the positions of the center for use 72b and the center of the near portion 73 (center for near use) 73b according to the user. Thereby, the area of the distance portion 72, the near portion 73 and the progressive portion 74 connecting them is determined, and the main gaze line 75 can be set, so the basic specifications of the progressive surface 71 are determined.

[Determination of base curve and frequency distribution]
Next, in step 14, the refractive power (frequency) distribution of the distance portion 72 is determined.

  First, in step 15, a base curve is selected from the S frequency 1d indicating the frequency of the customization information 1 and the C frequency 1e indicating astigmatism correction. In this example, as shown in FIG. 8, a look-up table in which a base curve value can be selected by a combination of S frequency 1d and C frequency 1e is set in the base curve file 53. For example, S frequency 1d and C frequency are set. 1e can set an appropriate base curve in units of 0.25 diopters (D).

  The basic curve (base curve) that gives the surface refractive power of the distance portion of the progressive lens is a spherical power (S power) 1d and an astigmatism power in consideration of optical performance, appearance, and whether the lens can be physically manufactured as a lens. (C frequency) 1e can be set in advance. Therefore, the base curve of the distance portion is determined from the prescription power (spherical power and astigmatic power) included in the customization information 1. Further, as described in step 19 below, the base curve of the near portion can be set by adding the addition power 1f to the base curve of the far portion. For example, if the S frequency 1d is 1.50D and the C frequency 1e is -1.00D, and the addition power is 2.25D, based on the base curve file 53 shown in FIG. The curve is set to 3.50D, and the base curve for the near portion is set to 5.75D.

  When the base curve of the distance portion is determined in step 15, the horizontal frequency distribution of the distance portion corresponding to the basic parameter determined based on the information related to the lifestyle 1 a of the customization information 1 is used in step 16. Extracted from the frequency distribution file 54. Regarding the frequency distribution, a lookup table for determining the distance frequency distribution corresponding to each of the basic parameters prepared in the basic parameter file 51 is prepared in advance in the file 54, and the frequency for each user is referenced with reference to this table. The distribution can be determined. As described above, it is possible to prepare a frequency distribution relating to a pattern of several tens or more progressive surfaces as a lookup table. Of course, it is also possible to obtain a frequency distribution using a function or the like. Further, in step 17, the frequency distribution of the entire distance portion 72 is determined from the base curve and the horizontal frequency distribution. The determined frequency distribution is output to the frequency distribution data file 81.

  Next, in step 18, the refractive power (frequency) distribution of the near portion 73 is determined.

  In this step, first, in step 19, the near portion curve is determined from the base curve determined in step 15 based on the addition degree 1f of the customization information. Further, in the same way as the distance portion, the near frequency distribution is determined with reference to the file 55 in step 20 based on the basic parameters set based on the lifestyle 1a information, and in the step 21, the frequency distribution of the entire near portion 72 is determined. To decide. The determined frequency distribution of the near portion is also output to the frequency distribution data file 81.

  Since the frequency distributions of the distance portion 72 and the near portion 73 shown in FIG. 13 are determined in this way, in step 22, the progressive portion (intermediate portion) is determined based on the frequency distribution of these regions output to the frequency distribution data file 81. ) 74 power (frequency) distribution is determined. The frequency distribution of the intermediate portion may be determined by setting a substantially constant frequency change from the distance portion to the near portion, but can be changed in accordance with how the user's line of sight is used. In the manufacturing method of this example, since the position and length of the progressive zone are determined in step 11, the frequency change of the progressive zone is determined in step 23 from the information of the line of sight 1g of the customized information 1. Then, referring to the horizontal frequency distributions of the distance portion 72 and the near portion 73 positioned above and below, in step 24, the progressive zone side frequency change is determined. Through the above steps, the information to be reflected in the design of the progressive surface in the customization information 1 can be reflected in the design parameter of the progressive surface. In this example, the frequency distribution of each region is finally obtained. I have to. The frequency distribution of each area finally determined is output to the frequency distribution data file 81 and passed to step 6 for deriving the wake coordinates.

[Different setting method of design parameters]
In the above, a large number of basic parameters for defining the clear vision area of the distance portion and the near portion, which are the basis of the design of the progressive multifocal lens, are prepared in advance in the file 51, and the optimum basic parameters among them are customized information 1 of the user. The manufacturing method which can make the progressive multifocal lens most suitable for an individual user by customizing by selecting is illustrated. Of course, the present invention is not limited to this manufacturing method. Select a large progressive multifocal lens type based on the occupation of the main life information, for example, a distance-oriented type, a far-medium / near balance type, or a near-oriented type, and a plurality of similar types based on hobbies. It is also possible to select one of them and set the basic parameters by weighting them with the sub-life information.

When the distance-oriented type is A group, the far-near-near balance type is B group, and the near-weighted type is C group, occupations suitable for adopting these types of spectacle lenses are, for example, It can be divided as shown in FIG. Similarly, hobbies suitable for employing each type of spectacle lens can be classified as shown in FIG. For each group A, B and C, it is possible to set basic parameters that indicate the size and position of the distance vision and near vision areas and further design parameters such as frequency distribution. When the selection results based on hobbies indicate the same type, the progressive multifocal lens can be designed with the design parameters set for each group. On the other hand, if the type based on occupation and the type based on hobby are different, the weighting function W1 is obtained from the ratio information of occupation and hobby for each user, and the design parameters such as the basic parameters that are optimal for the user by the following formula: Can be requested.
Optimal design parameters = Design parameters of the type selected based on occupation x W1
+ Design parameters of the type selected based on hobbies x (1-W1) (1)

  Here, the weighting function W1 is a weighting function according to occupation.

  For example, a user who uses glasses almost evenly for occupation and hobby can set the weighting function W1 to 50%. On the other hand, if 90% is a user who uses glasses for occupation, the weighting function W1 can be set to 90%. In this example as well, design parameters such as basic parameters are set based on two main life information in different categories as described above, and these are adjusted with sub-life information such as the ratio of time spent on the user's occupation and hobby. Thus, a progressive multifocal lens more suitable for an individual user can be manufactured and supplied.

  In this way, since the optimum spectacle lens design parameters corresponding to the individual life work of the user are determined, it is possible to proceed with the design using customization information related to the eyes of other users in the same manner as the manufacturing method described above. it can. Also in this example, it is also possible to further correct the optimum design parameter set by the above equation (1) based on the user's experience (history) of eyeglass lens usage.

As an example, in the case of a user who is wearing a progressive multifocal lens for the first time this time, there are many cases where the limitation of the field of view and image distortion peculiar to the progressive multifocal lens are concerned. Therefore, for such users, a progressive multifocal lens of a type that emphasizes distance use, that is, a design close to the group A is preferable. Therefore, the optimum design parameter determined by the above equation (1) can be corrected by the following equation (2) as the optimum design parameter 1.
Optimal design parameter 2
= Optimum design parameter 1 × W2 + A group design parameter × (1−W2) (2)

  Here, the weighting function W2 is a value relating to the user's suitability for the progressive multifocal lens, and a value of 0 to 1 can be adopted, but about 0.1 to 0.7 seems to be good.

Further, the weighting function W2 can be a function of the addition frequency 1f of the user. For a user with a low addition 1f, the optimum function parameter 1 remains unchanged, and the field of view is limited and distortion is small. Therefore, the weighting function W2 may be a value close to 1. On the other hand, in the case of a user with a large addition 1f, it is easier to get used to even the first user when the weighting function W2 is close to 0, that is, closer to the distance-oriented type. As such a weighting function W2, a function as shown in the following equation (3) can be adopted.
W2 = α−ADD × β (3)

  Here, ADD is the addition 1f, and α and β are coefficients set so as to obtain an appropriate weighting function W2 for the addition 1f. For example, when α = 0.8 and β = 0.2, Equation (3) takes a value of 0.1 to 0.7 in the range where the addition 1f is 0.50 to 3.50D.

Further, in the case of a user who has already worn a progressive multifocal lens, it is possible to perform correction that reflects in the optimum design parameter 1 whether or not the user has been satisfied with the previously worn lens. For example, in the case of a user who is satisfied with the previous (current) lens, the optimum design parameter 3 is obtained by the following equation (4) using the previous progressive multifocal lens type and the optimum design parameter 1. be able to.
Optimal design parameter 3
= Optimal design parameter 1 x (1-W3)
+ Design parameter of previous progressive multifocal lens type × W3 (4)

  Here, the weighting function W3 is a value related to the user's suitability for the previous progressive multifocal lens, and a value of 0 to 1 can be adopted.

  Alternatively, design parameters indicating individual elements of the previous lens can be analyzed in advance, and the individual design parameters can be corrected to approach the previous lens design parameters.

  Conversely, for users who are dissatisfied with the previous lens, the design parameters can be corrected to improve the dissatisfied part. For example, for a user who has not been able to apply the previous lens due to a large distortion, the design parameter of the previous lens is compared with the optimum design parameter 1, and if it is desirable to keep the distortion low, A Add weighted group design parameters. For users who are dissatisfied with the fact that the near portion is narrow, the design parameters of the group C, which is a type that emphasizes near vision, can be weighted and added to derive the optimum design parameters.

  In this way, design parameters that reflect customization information related to each user's life work are determined, and further corrections are made based on customization information related to each user's eyes in the same manner as described above. The frequency distribution of is derived. As described above, according to the present invention, it is possible to design and manufacture a custom-made progressive multifocal lens by converting customization information into an optimum design parameter for each user using an appropriate function.

[Derivation of coordinate data of progressive surface]
FIG. 11 shows the processing in step 6 for deriving the coordinates of the custom-made progressive surface 71 performed by the coordinate data deriving unit 62. Specifically, in this processing, coordinates are calculated one after another from the center of the lens toward the outer peripheral direction by connecting microspheres having a radius of curvature corresponding to the frequency distribution of each point. The radius of curvature R (m) at each point can be obtained by the following equation where the frequency distribution is D (diopter) and the material refractive index of the lens is n.
R = (n−1) / D (5)

  First, in step 25, the surface shape along the main meridian (main gaze line) 75 is determined. Usually, in many cases, the surface shape is determined so that astigmatism does not occur along the main meridian 75, but it is possible to provide an astigmatism correction function or to fold predetermined aberrations for other purposes. is there. In step 26, the surface shape along the main meridian 75 of the distance portion 72 is determined according to the frequency distribution of the distance portion 72 determined above. Similarly, in step 27, the surface shape along the main meridian 75 of the near portion 73 and in step 28 the surface shape along the main meridian 75 of the progressive portion 74 are determined.

  Next, in step 29, the coordinates of the progressive surface 71 extending laterally from the main meridian 75 are determined. First, in step 30, the distance side shape is determined according to the frequency distribution of the distance portion 72 determined by the customization information 1. Similarly, the near side shape is determined according to the frequency distribution of the near portion 73 at step 31, and the progressive band side shape is determined according to the frequency distribution of the progression portion 74 at step 32. In this way, the coordinates of the progressive surface reflecting the customization information 1, that is, the custom-made progressive surface 71 are determined. The custom-made progressive surface 71 is a uniform progressive surface that is different for each user, and is a progressive surface that matches the user's eye condition, lifestyle, and the like. Therefore, it is possible to provide a progressive surface that provides an easy-to-use and comfortable visual field for each user.

[Lens shape determination]
Since the progressive surface is determined as described above, next, as shown in more detail in FIG. As the lens shape, if the progressive surface 71 is formed on the convex surface, it is necessary to determine the shape of the concave surface. The rear surface of the lens usually has a spherical surface having a radius R1 or a toric surface shape having radii R1 and R2, and the base curve of the surface of the distance portion is D0 (dioptry) and the center thickness of the lens is t (m). Then, it can be calculated by the following equation (6).
R1 = (n-1) / D1
R2 = (n-1) / D2
D1 = D0 / (1-t · D0 / n) -S
D2 = D1 + C (6)

  Here, S is the spherical power (S frequency) 1d of the prescription of the custom information 1, and C is the astigmatic power (C frequency) 1e.

  In this way, the toric surface forming the back surface of the lens is determined by the S power 1d, C power 1e of the customization information 1 and the astigmatic axis 1h indicating the direction of astigmatism.

  For users who are prescribed a plus power, the center thickness t that can be physically manufactured depends on the size of the lens. Therefore, the center thickness t is evaluated based on the frame shape 1i of the customization information, and the optimum thickness is obtained. The lens can be determined. Further, the curvatures R1 and R2 of the back surface also change depending on the value of t. On the other hand, for users who do not specify the frame shape, the standard lens diameter, minimum center thickness, and minimum edge thickness can be set according to the prescription powers 1d and 1e. The shape of the progressive multifocal lens is determined. For this reason, in the manufacturing method of this example, a lens diameter file 57, a minimum center thickness file 58, and a minimum edge thickness file 59 are prepared. In these files, respective values are obtained by S frequency and C frequency. A look-up table formed so as to be stored is stored. A value indicating the shape of the lens for each user determined based on the coordinate data stored in the coordinate data file 82 in this manner is output to the lens shape file 83 and passed to the next step.

(Optical performance correction)
Further, in the manufacturing method of this example, the lens shape determined as described above can be corrected in more detail in step 8 by the fitting data 1j of the customization information 1 such as the bend angle, the forward tilt angle, and the vertex distance. For example, the distance between the vertices is usually 12 mm as a reference, but when the distance between the vertices deviates from this value when the user actually wears the lens, the correction effect of the spectacle lens is lowered and the frequency that is actually felt by the eye It is generally known that changes. In addition, in a lens having an astigmatism correction function, the astigmatism correction effect also changes. Accordingly, in this step 8, it is assumed that the user actually puts his / her glasses on the eye, and the curvatures R1 and R2 on the back surface can be corrected so that appropriate spherical power and astigmatic power can be obtained at that time. Yes. In step 8 for performing such correction, for example, a ray tracing method or the like can be used. In addition, after the lens shape is determined, the difference in astigmatism and refractive power distribution at the actual eye position is obtained, and the progressive surface or concave surface of the convex surface is corrected so that these are minimized, and the warp angle and forward tilt are corrected. The distance between the near part and the user's cornea can be calculated from the corner, and the addition can be corrected in consideration of the deviation of the adjustment effect. The optical power of the spectacle lens designed for each user The performance can be further enhanced. In this example, a progressive surface is designed for each individual user, and the lens shape is determined based on the progressive surface. Therefore, depending on the wearing state of the glasses (frequency, physical characteristics, wearing information, etc.) for each individual user. The progressive surface or lens shape design can be corrected. Therefore, it is possible to provide a spectacle lens that is optimal for the individual user including the wearing state.

[Derivation of machining data]
As described above, when the lens shape output to the lens shape file 83 is finally determined, processing data for performing NC processing or the like is created in step 9 as described above, and the lens is actually processed. . Accordingly, the processed progressive multifocal lens becomes a lens custom-made for each user, and a lens that can provide the user with the most comfortable field of view can be supplied. In addition, conditions such as the user's power, lifestyle, and fitting situation are all reflected before the lens processing data described above is created, so processing can be done in one step, and a progressive multifocal lens can be installed in a short time. Can be custom made. In the processing step 3, the lens base material is processed to form a progressive multifocal lens, and the target lens is processed in accordance with the frame frame, and is molded into a spectacle lens 79 as shown in FIG. Further, a color coat, a UV coat, etc. are added at the same time as requested by the user.

  As described above, in the progressive multifocal lens manufacturing method of this example, the process starts from the process of designing the optimum progressive surface for the user in accordance with the customization information obtained from the user, and is a custom-made progressive surface. Progressive multifocal lenses equipped with are processed and shipped. Therefore, the progressive multifocal lens having the optimum optical performance for each person can be custom-made according to the individual lifestyle, physical characteristics, wearing state, etc. of the wearer of the progressive multifocal lens. Therefore, it is possible to provide a progressive multifocal lens that can provide a more comfortable field of view than ever before for a wide variety of users. Further, since each progressive multifocal lens is manufactured by starting from the design of the progressive surface, it is not necessary to stock and manage the semi-finished lens. Accordingly, the processing cost can be reduced, and a spectacle lens having optical performance that satisfies the user can be provided at low cost.

  In the above description, the example in which the convex surface on the object side is a progressive surface is described, but it is of course possible to form a progressive surface on the concave surface on the eyeball side, and the functions of the progressive surface and the toric surface on the concave surface side are possible. It is also possible to add. Furthermore, depending on the user's request, it is possible to design that incorporates fashion factors, and to provide progressive multifocal lenses that are fashionable and have excellent optical performance according to individual user preferences. Can do.

  Furthermore, in the lens design software described above, an example in which many filed lookup tables are used has been explained. However, in addition to the filed data, instead of using the appropriate function, etc. It is of course possible to derive parameters, lens data, and further correction data. In addition, the design procedure of the progressive multifocal lens is not limited to the procedure shown in the flowchart above, but may be software that can obtain an equivalent result. Furthermore, even if the information used when custom-made progressive multifocal lenses are part of the information described above, the effects of the present invention can be achieved by starting the design of lenses for individual users from the progressive surface. Of course you can get it. Furthermore, in addition to the customization information described above, it is a matter of course that a lens more suitable for the user can be provided by reflecting more information on the eye state or life of the user in the lens design.

  The present invention relates to a manufacturing method and a manufacturing apparatus for a progressive multifocal lens for correcting vision, a progressive multifocal lens and a spectacle lens manufactured by the manufacturing method.

The flowchart which shows the main manufacturing processes of the progressive multifocal lens of this invention. The block diagram which shows the outline of the manufacturing apparatus of the progressive multifocal lens of this invention Among the flowcharts shown in FIG. 1, a flowchart showing in more detail the process of reflecting customization information in design parameters. Among the flowcharts shown in FIG. 3, a flowchart showing in more detail the process of determining basic parameters. Diagram showing the basic parameter file Diagram showing an overview of the occupation file with basic parameters based on occupation Overview of hobby files with basic parameters based on hobbies Overview of base curve file with base curve The figure which shows the example which chooses the type of progressive multifocal lens by occupation The figure which shows the example which selects the type of a progressive multifocal lens by hobby Among the flowcharts shown in FIG. 1, a flowchart showing in more detail the process of designing a progressive surface according to design parameters. Of the flowchart shown in FIG. 1, a flowchart showing in more detail the process of determining the shape of the lens and the process of correcting the optical performance. The figure explaining schematic structure of a progressive multifocal lens and a spectacle lens Flow chart showing the outline of the manufacturing process of a conventional progressive multifocal lens

Claims (2)

A progressive multifocal lens manufacturing apparatus having a progressive surface that constitutes a distance part and a near part having different refractive powers, and a progressive part in which refractive power changes progressively between these parts,
Design a progressive surface reflecting user-specific customized information including at least one of information related to each user's eyes and information related to the user's life, and a progressive image with this custom-made progressive surface It has a lens design unit that derives the processing data of the focal lens,
The lens design unit includes a design parameter determination unit that reflects the customization information in a design parameter of the progressive surface,
A coordinate data deriving section for deriving coordinate data of the custom-made progressive surface based on the design parameters;
A lens shape determination unit for determining a shape of a custom-made lens having the custom-made progressive surface based on the customization information;
An optical performance correction unit that corrects the shape of the custom-made lens so that optical performance is improved based on the customization information;
A processing data creation unit for deriving processing data of the corrected shape of the custom-made lens;
Among the design parameters, a basic parameter file in which a plurality of basic parameters relating to the setting of the clear vision area of at least the distance portion or the near portion is prepared in advance,
A frequency distribution data file in which the frequency distribution of the distance portion or the near portion corresponding to these basic parameters is prepared in advance;
A plurality of base curves for setting the surface refractive power of the distance portion and a base curve file prepared in advance;
The design parameter determination unit selects the basic parameters from the basic parameter file based on at least first and second main life information of different categories related to the user's life included in the customization information. A basic parameter selector,
From the plurality of basic parameters selected by the basic parameter selection unit based on sub-life information reflecting a ratio in which the first and second main life information included in the customization information affects the eyes of the user A basic parameter adjusting unit for determining the basic parameters used for designing a custom-made lens;
A base curve selection unit that selects the base curve of the distance portion and the near portion from the base curve file based on the frequency information included in the customization information;
A first frequency distribution determining unit that determines the frequency distribution of the distance portion or the near portion based on the frequency distribution data of the frequency distribution data file;
An apparatus for manufacturing a progressive multifocal lens, comprising: a second frequency distribution determining unit that determines the frequency distribution of the progressive unit based on the frequency distribution of the far and near units. In the progressive multifocal lens manufacturing apparatus according to claim 1,
The design parameter determination unit further includes, among information related to the user's glasses included in the customization information, presence / absence of use of a spectacle lens, suitability for a progressive multifocal lens, and current or past wearing. An apparatus for manufacturing a progressive multifocal lens, comprising: a basic parameter correction unit that corrects the basic parameter based on history information relating to suitability for glasses.

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