JP6298231B2 - Spectacle lens design method and spectacle lens manufacturing method - Google Patents

Description

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

  A progressive power lens comprising a distance portion which is a region having a refractive power corresponding to a distant view and located above the lens, and a near portion which is a region having a refractive power corresponding to a distant view and located below the lens. Are known.

  In order to design a progressive-power lens suitable for spectacle wearers, parameters such as the interpupillary distance in the far vision state, the interpupillary distance in the near vision state, the corneal apex distance, the forward tilt angle, and the warp angle are set. It is used. As an apparatus for measuring these parameters, for example, a measuring apparatus that uses an image obtained by capturing a spectacle wearer is known (see Patent Document 1).

JP 2007-93636 A

  In a spectacle store, for example, when a customer purchases new spectacles, the customer wears a new spectacle frame selected by the customer and measures the above parameters. In this case, the selected spectacle frame is in a state in which a dummy lens having no power is attached. However, when the customer actually uses spectacles, a spectacle lens having a frequency corresponding to the customer's spectacle prescription value is attached to the selected spectacle frame. Therefore, in the measurement apparatus of the prior art, for the parameters related to the eye position in the near vision state, such as the distance between the pupils in the near vision state, the measured value and the actual glasses are used by the prism action of the spectacle lens. The value at will be different. Therefore, when a spectacle lens is designed using this measurement value, there is a possibility that a spectacle lens suitable for a spectacle wearer cannot be designed.

(1) A spectacle lens design method according to the first aspect of the present invention includes a far vision image imaging step of imaging a spectacle wearer in a far vision state by an imaging means, and an imaging means for a spectacle wearer in a near vision state. A distance vision parameter measurement step for measuring a distance vision parameter related to the position of the eye in the distance vision state, based on the distance vision image captured by the distance vision image imaging step; The near work distance measurement that measures the near work distance that is the distance from the spectacle wearer to the spectacle wearer's gazing point in the near vision state based on the near vision image captured by the near vision image capturing process For ray tracing calculation using the distance vision parameter measured by the distance vision parameter measurement process, the near work distance measured by the near distance measurement process, and the spectacle prescription value of the spectacle wearer What has a design process for designing a spectacle lens, and in the design process, based on the far vision parameters, by ray tracing calculation, the interpupillary distance in near vision state, the spectacle lens in the near vision state A near vision fitting height that is the height of the pupil with respect to is calculated, and a near eyepoint in the spectacle lens is set based on the parameter calculated by ray tracing calculation .
(2) spectacle lens manufacturing method according to the invention of claim 6, produce spectacle lens designed by the spectacle lens designing method according to any one of claims 1 to 5.

  According to the present invention, a spectacle lens suitable for a spectacle wearer can be designed.

It is a figure explaining the structure of a parameter measurement apparatus. It is a figure explaining the spectacles wearer of a far vision state. It is a figure explaining the spectacles wearer of a near vision state. It is a figure explaining a fitting parameter. It is a figure explaining a fitting parameter. It is a figure explaining the change of the amount of inset according to the power of a spectacle lens. It is a flowchart explaining a series of procedures which provide spectacles. It is a figure explaining fitting height. It is a figure which illustrates typically the relationship of the light ray when a spectacles wearer gazes at a nearby point.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining the configuration of a parameter measuring apparatus 1 for measuring various parameters (hereinafter referred to as fitting parameters) in a state in which a spectacle wearer wears spectacles. The parameter measuring device 1 includes a main body device 10, a main body computer 20, a tablet computer 30, and a touch panel display 40.

  The main unit 10 has a vertically long casing 11, and a mirror 12 is provided on the surface of the casing 11. In the housing 11 of the main body device 10, a far vision camera 13 for imaging a state in which the spectacle wearer viewed far, a light source (not shown) for illuminating the spectacle wearer, and the like are provided. Yes. The far vision camera 13 includes an upper camera 13T arranged on the upper side and a lower camera 13D arranged on the lower side. The main device 10 is connected to the main computer 20 and outputs an image captured by the far vision camera 13 to the main computer 20.

  The tablet computer 30 is a portable computer that can be held by a spectacle wearer. The tablet computer 30 is provided with a near vision camera 31 for photographing a state in which a spectacle wearer has viewed near, a touch panel display 32, and the like. The tablet computer 30 transmits an image captured by the near vision camera 31 to the main computer 20 by wireless communication, for example.

  The main body computer 20 is provided with a calculation unit such as a CPU for performing calculation processing, a storage unit for storing various data, and the like. The storage unit stores a program for executing the fitting parameter measurement process, and the calculation unit performs the fitting parameter measurement process by executing the program stored in the storage unit.

  The touch panel display 40 is connected to the main computer 20, and various information output from the main computer 20 (for example, images captured by the far vision camera 13 and the near vision camera 31, the measurement results of the fitting parameters, and the like). ) Is displayed. Further, the measurer can operate the main body computer 20 or input various information by a touch operation on the touch panel display 40.

  FIG. 2 is a diagram for explaining a state in which the spectacle wearer 2 captures a state viewed from a distance. As shown in FIG. 2, the imaging device 10 is disposed in front of the spectacle wearer 2 when photographing the state in which the spectacle wearer 2 viewed from a distance. At this time, the imaging device 10 is arranged so that the upper camera 13T images the vicinity of the glasses of the spectacle wearer 2 from the front, and the lower camera 13D images the vicinity of the glasses of the spectacle wearer 2 from the oblique lower side. For example, the spectacle wearer 2 is in a far vision state by looking straight at the center of the bridge of his / her glasses reflected on the mirror 12 of the imaging device 10. In this state, the spectacle wearer 2 is imaged by the upper camera 13T and the lower camera 13D. Actually, even in this state, the eye is slightly inward, so in the fitting parameter measurement process described later, the interpupillary space obtained based on the image captured by the far vision camera 13 is used. The distance (PD) is corrected using the distance between the spectacle wearer and the mirror 12.

  FIG. 3 is a diagram for explaining a state in which the spectacle wearer 2 takes a close-up view. As shown in FIG. 3, when photographing the near-sighted state of the spectacle wearer 2, the spectacle wearer 2 is a tablet type so that the near-eye camera 31 can capture the vicinity of the spectacle wearer 2. Hold computer 30 in your hand. At this time, the spectacle wearer 2 is in a near vision state by holding the tablet computer 30 in his / her natural state, for example, when reading a book or operating a portable terminal. It becomes. In this state, the eyeglass wearer 2 is imaged by the near vision camera 31.

  The main body computer 20 measures the fitting parameters of the spectacle wearer based on images taken by the far vision camera 13 and the near vision camera 31. First, the fitting parameter measured based on the image captured by the far vision camera 13 will be described with reference to FIG. 4A is a view of the spectacle wearer as viewed from the front, FIG. 4B is a view of the spectacle wearer as viewed from the side, and FIG. 4C is a spectacle wearer. It is the figure which looked at from the top. The main computer 20 measures the distance between the one-eye pupils in the far vision state (far-right PD and far-left PD) based on the image captured by the upper camera 13T. As shown in FIG. 4A, the far right PD (RFPD) and the far left PD (LFPD) are distances from the pupil center of the right eye or the left eye to the center of the bridge of the glasses 3 in the far vision state. is there. The main computer 20 measures the corneal apex distance VD, the forward tilt angle TI, and the warp angle WR based on the images captured by the upper camera 13T and the lower camera 13D. As shown in FIG. 4B, the corneal apex distance VD is a distance from the apex of the cornea of the spectacle wearer to the inner surface of the spectacle lens. As shown in FIG. 4B, the forward tilt angle TI is an angle of the spectacle lens surface with respect to the vertical direction. The warp angle WR is the angle of the spectacle lens surface with respect to the horizontal direction along the bridge of the spectacles 3 as shown in FIG. In the parameter measuring apparatus 1 of the present embodiment, the eyeglass wearer is imaged from two different directions depending on the upper camera 13T and the lower camera 13D, thereby measuring the corneal apex distance VD, the forward tilt angle TI, and the warp angle WR. It is possible.

  Next, the fitting parameters measured based on the image captured by the near vision camera 31 will be described with reference to FIG. 5A is a view of the spectacle wearer as viewed from the front, and FIG. 5B is a view of the spectacle wearer as viewed from the side. The main body computer 20 measures the distance between the one-eye pupils in the near vision state (right eye near PD and left eye near PD) and the near work distance based on the image captured by the near vision camera 31. . As shown in FIG. 5A, the right eye near PD (RNPD) and the left eye near PD (LNPD) are from the pupil center of the right eye or the left eye in the near vision state to the center of the bridge of the glasses 3. Is the distance. As shown in FIG. 5B, the near work distance ND is the distance from the eye of the spectacle wearer to the gazing point (here, the tablet computer 30).

  In this way, the parameter measuring device 1 actually measures the fitting parameters of the spectacle wearer in the far vision state and the near vision state. Note that various methods may be used for obtaining the above-described fitting parameters based on the images captured by the far vision camera 13 and the near vision camera 31. For example, it is possible to use a method of photographing in a far vision state and a near vision state with a measuring jig having a known length attached to a spectacle frame. In this method, first, a value on a captured image is obtained for each fitting parameter. Then, the value of each fitting parameter on the captured image is converted into an actual value on the basis of the length of the measurement jig on the captured image. Further, the near working distance is calculated based on the size of the measuring jig mounted on the spectacle frame on the image captured by the near vision camera 31.

  By the way, in a spectacle store, for example, when a customer newly purchases spectacles, when the customer selects a spectacle frame for new spectacles, the fitting parameters described above are measured with the spectacle frame worn by the customer. At this time, the fitting parameter is measured in a state in which the selected spectacle frame is mounted with a dummy lens that does not include the power. However, when the customer actually uses spectacles, a spectacle lens having a frequency corresponding to the customer's spectacle prescription value is attached to the selected spectacle frame. Therefore, for the right eye near PD and the left eye near PD, the values at the time of measurement and at the time of actual use change due to the prism action of the spectacle lens.

  This will be described with reference to FIG. Even if the power of the spectacle lens is changed, the far right PD and the far left PD do not change. Therefore, when the power of the spectacle lens is changed, the change amount of the right eye near PD and the inset amount of the right eye (the amount obtained by subtracting the right eye near PD from the right eye far PD) are the same. The amount of change in the left eye near PD and the inset amount of the left eye (the amount obtained by subtracting the left eye near PD from the left eye far PD) are the same. Therefore, in the following description, how the inset amount changes according to the power of the spectacle lens will be described with reference to FIG. 6A shows a case where the spectacle lens GL has a positive power (a convex lens), and FIG. 6B shows a case where the power of the spectacle lens GL is zero (a plano lens). FIG. 6C shows the case where the spectacle lens GL is a minus power (concave lens). 6A to 6C, conditions other than the power of the spectacle lens GL (for example, the far right PD, the far left PD, and the near working distance) are the same.

  As can be seen by comparing FIG. 6A and FIG. 6B, when the spectacle lens GL has a positive power, the light beam L1 from the object is refracted by the prism action of the spectacle lens GL, thereby causing spectacles. On the lens GL, it passes through a point on the inner side (nose side) from the point through which the light ray L2 from the object when the power of the spectacle lens GL is zero. For this reason, when the spectacle lens GL is a plus power, the amount of inset is larger than when the power is zero.

  Further, as can be seen by comparing FIG. 6B and FIG. 6C, when the spectacle lens GL has a negative power, the light beam L3 from the object is refracted by the prism action of the spectacle lens GL. On the spectacle lens GL, the point on the outer side (ear side) is transmitted from the point where the light ray L2 from the object is transmitted when the power of the spectacle lens GL is zero. For this reason, when the spectacle lens GL has a negative power, the amount of inset is smaller than when the power is zero.

  As described above, when the spectacle wearer wears spectacles with a dummy lens that does not contain power and when wearing spectacles with a spectacle lens that contains power, the near PD and The amount of inset will be different. Therefore, in the present embodiment, when designing a spectacle lens, parameters that do not change even if the power of the spectacle lens is different (far right PD, far left PD, corneal apex distance, anteversion angle, sled angle, near distance). For the working distance), the measurement result obtained by the parameter measuring device 1 is used as it is. On the other hand, for the parameters (right-eye near PD, left-eye near PD) that change when the power of the spectacle lens is different, the value when the spectacle wearer wears spectacles with the spectacle lens including the power. Is calculated by ray tracing calculation.

  In this ray tracing calculation, a ray that is emitted from a nearby object (a point of sight of the spectacle wearer), enters the spectacle lens, and reaches the rotation center of the spectacle wearer's eyeball is obtained. Here, as the power of the spectacle lens, a prescription value (spherical power (S power), astigmatic power (C power), astigmatic axial power, addition power, etc.) of the spectacle lens for the spectacle wearer is used. Further, as parameters representing the positional relationship between the spectacle lens and the eyeball of the spectacle wearer, the far right PD, the far left PD, the corneal apex distance VD, the forward tilt angle TI, and the warp angle measured by the parameter measuring apparatus 1 are used. WR is used. Further, as the distance between the spectacle wearer and the gaze point, the near work distance ND measured by the parameter measuring device 1 is used.

  As described above, the spectacle lens prescription value of the spectacle lens and the fitting parameter measured by the parameter measuring apparatus 1 are used to perform ray tracing calculation, and the spectacles having the frequency corresponding to the spectacle wearer's prescription value are included. The right eye near PD and the left eye near PD when the lens is worn are calculated.

  Next, in this embodiment, a series of procedures for providing glasses to a customer will be described with reference to the flowchart shown in FIG. The left side of FIG. 7 shows the procedure performed at the eyeglass store, and the right side of FIG. 7 shows the procedure performed at the lens manufacturer. In step S10, the customer determines a spectacle frame to purchase at the spectacle store.

  In step S11, prescription values (for example, spherical power (S power), astigmatism power (C power), astigmatic axial power, addition power, etc.) of the eyeglass lens to be mounted on the eyeglass frame determined in step S10 are determined. The prescription value of the spectacle lens is determined based on a prescription issued to the customer by an ophthalmologist or a vision check performed at a spectacle store. A store clerk of the spectacle store inputs the prescription value of the spectacle lens to the parameter measuring device 1 via the touch panel display 40.

  In step S <b> 12, the fitting parameter is measured by the parameter measuring device 1 in a state where the customer wears the spectacles in which the dummy lens not included in the spectacle frame determined in step S <b> 10 is attached.

  Specifically, as described above, the parameter measuring apparatus 1 images the customer (glasses wearer) in the far vision state with the far vision camera 13. Further, the parameter measuring device 1 images a customer (glasses wearer) in the near vision state by the near vision camera 31. Then, the main body computer 20 of the parameter measuring apparatus 1 measures the fitting parameters based on the images captured by the far vision camera 13 and the near vision camera 31.

  In step S13, the clerk of the spectacle store stores spectacle lens information including the spectacle frame information determined in step S10, the spectacle lens prescription value determined in step S11, and the fitting parameter measured by the parameter measuring device 1 in step S12. The ordering information is input to an ordering computer (not shown) installed in the spectacle store. The ordering computer transmits the input ordering information to a receiving order computer (not shown) installed at the lens manufacturer via a network such as the Internet.

  In step S20, in the lens manufacturer, the order receiving computer receives the spectacle lens ordering information from the ordering computer of the spectacle store. In step S21, the order receiving computer designs a spectacle lens based on the received spectacle lens ordering information.

  Specifically, the order receiving computer includes the prescription value of the spectacle lens included in the received spectacle lens ordering information, the far right PD, the far left PD, the corneal apex distance VD measured by the parameter measuring device 1, The ray tracing calculation described above is performed using the tilt angle TI, the warp angle WR, and the near work distance, and the right eye near PD and the left eye near PD are calculated.

  For example, when designing a progressive power lens, the designer of the lens manufacturer proceeds progressively based on the far right PD and far left PD measured by the parameter measuring device 1 (that is, included in the ordering information). Set the distance eyepoint in the power lens. The designer of the lens manufacturer sets a near eye point in the progressive power lens based on the right eye near PD and the left eye near PD calculated by the ray tracing calculation.

  In step S22, the order receiving computer outputs the spectacle lens design data designed in step S21 to a processing machine control device (not shown). Based on this design data, the processing machine control device sends a processing instruction to a spectacle lens processing machine (not shown). As a result, the spectacle lens based on the design data is processed and manufactured by the spectacle lens processing machine. Then, the spectacle lens manufactured by the spectacle lens processing machine is shipped to a spectacle store. In step S14, the spectacle store completes the spectacle lens by manufacturing the spectacle lens manufactured in step S22 in the spectacle frame determined in step S10, and provides it to the customer.

According to the embodiment described above, the following operational effects can be obtained.
The spectacle lens design method in the present embodiment includes a step of imaging a spectacle wearer in a far vision state with the far vision camera 13 and a step of imaging a spectacle wearer in a near vision state with the near vision camera 31. And a step of measuring the right-eye far-field PD, the left-eye far-field PD, the corneal apex distance, the forward tilt angle, and the warp angle based on the image captured by the far vision camera 13, and the near vision camera 31. Measuring the near working distance based on the obtained image, the right eye far PD, the left eye far PD, the corneal apex distance, the forward tilt angle and the warp angle, the near work distance, the spectacle prescription value of the spectacle wearer, Calculating the right eye near PD and the left eye near PD by ray tracing calculation using the eyeglass, the spectacle prescription value of the spectacle wearer, and the measured right eye far PD, left eye far PD, corneal vertex distance , With forward tilt and sled angle, By using the right eye near vision PD and the left eye near vision PD that serial calculated, having a design process for designing a spectacle lens. Accordingly, since the spectacle lens can be designed using the right eye near PD and the left eye near PD in a state where the spectacle wearer wears the spectacles actually used, the spectacle lens suitable for the spectacle wearer can be obtained. Can be designed.

(Modification 1)
Furthermore, the spectacle lens may be designed using the height of the pupil center with respect to the spectacle lens (hereinafter referred to as the fitting height). The fitting height (FH, NH) is, for example, the distance from the center of the pupil to the lower side of the spectacle lens GL as shown in FIG.

  Further, in the near vision state as shown in FIG. 8B, the pupil is closer to the lower side than the far vision state shown in FIG. 8A, so the fitting height NH in the near vision state is This is lower than the fitting height FH in the far vision state. Also, the fitting height NH in the near vision state varies depending on the power of the spectacle lens due to the prism action of the spectacle lens. Therefore, in the case of the first modification, in addition to the corneal apex distance, the forward tilt angle, and the warp angle, the distance height fitting height FH is measured by the parameter measuring device 1, and the measured corneal apex distance, forward tilt angle, and warp angle are measured. The fitting height NH in the near vision state is calculated by ray tracing calculation using the fitting height FH in the far vision state and the prescription value of the spectacle wearer.

  As described above, the present invention relates to parameters relating to the eye position of the spectacle wearer in the distance vision state and the near vision state (for example, the distance between the pupils of both eyes, the distance between the pupils of one eye, the inset amount, and the fitting height). Etc.) can be applied when designing a spectacle lens.

(Modification 2)
FIG. 9 is a diagram schematically illustrating the relationship of light rays when the spectacle wearer gazes at a nearby point A when the left and right spectacle lenses have different frequencies. A light ray LR in FIG. 9 indicates a light ray that originates from the point A and enters the right eyeglass lens GL and reaches the rotation center O of the eyeball (right eye) Ey. A light ray LL in FIG. 9 indicates a light ray that is emitted from the point A and enters the left eyeglass lens GL and reaches the rotation center O of the eyeball (left eye) Ey. FIG. 9 shows a case where the right eyeglass lens has a higher negative power (higher refractive power) than the left eyeglass lens. Therefore, in the spectacle lens, the light ray LR is refracted more than the light ray LL, and the transmission point B through which the right eye line of sight (light ray LR) passes is the transmission point through which the left eye line of sight (light ray LL) passes. The position is higher than the position C.

  Here, when gazing at the same point A with the left and right eyes, in the left and right eyeglass lenses, the lens characteristics (including the addition power, and the transmission point B of the left eye gaze and the transmission point C of the right eye gaze) If the astigmatism, distortion, etc.) are different, the same image is not formed between the left and right eyes, which gives the spectacle wearer an uncomfortable feeling. Therefore, it is preferable that the transmission characteristics B of the left spectacle lens and the transmission point C of the right spectacle lens have similarity in lens characteristics.

  Therefore, when designing the spectacle lens in step S21 described above, in the ray tracing calculation described above, in the near vision state, the transmission positions at which the left and right lines of sight pass through the left and right spectacle lenses are calculated. The left and right eyeglass lenses are designed to have similarities in the lens characteristics at the calculated transmission position. Thereby, even if the power of the right and left spectacle lenses is different, a spectacle lens comfortable for the spectacle wearer can be designed.

(Modification 3)
Note that the measurement by the parameter measuring apparatus 1 may be performed in a state where the spectacle wearer wears a spectacle frame without a spectacle lens. Also in this case, the right eye near PD and the left eye near PD can be calculated by ray tracing calculation in the same manner as in the above-described embodiment. Alternatively, the spectacle wearer may perform the measurement by the parameter measuring device 1 while wearing spectacles with spectacle lenses with an arbitrary frequency. In this case, the right eye near PD and the left eye near PD are calculated by ray tracing calculation based on the power of the spectacles worn at the time of measurement and the prescription value of the spectacle wearer.

  The above description is merely an example, and is not limited to the configuration of the above embodiment. Moreover, you may combine the structure of each modification suitably with the said embodiment.

DESCRIPTION OF SYMBOLS 1 ... Parameter measuring device, 13 ... Camera for distance vision, 20 ... Main body computer, 31 ... Camera for near vision, 40 ... Touch panel type display

Claims (6)

A far vision image imaging step of imaging a spectacle wearer in a far vision state by an imaging means;
A near vision image imaging step of imaging the spectacle wearer in the near vision state by imaging means;
Based on the far vision image captured by the far vision image imaging step, a far vision parameter measuring step for measuring a far vision parameter related to the position of the eye in the far vision state;
A near distance measuring distance work distance that is a distance from the spectacle wearer to the spectacle wearer's gazing point in the near vision state based on the near vision image captured by the near vision image capturing step Working distance measurement process,
The spectacle lens is obtained by ray tracing calculation using the far vision parameter measured by the far vision parameter measurement step, the near work distance measured by the near work distance measurement step, and the spectacle prescription value of the spectacle wearer. Design process to design,
Have
In the design process,
Based on the far vision parameter, the ray tracing calculation calculates the interpupillary distance in the near vision state and the near vision fitting height that is the height of the pupil relative to the spectacle lens in the near vision state,
A spectacle lens design method in which a near eye point in the spectacle lens is set based on a parameter calculated by the ray tracing calculation . In the spectacle lens design method according to claim 1,
In the design step, the ray tracing calculation calculates a transmission position where the left and right eye lines of the spectacle wearer pass through the left and right eyeglass lenses, respectively, and the left and right eyeglass lenses are similar to the lens characteristics at the transmission position. eyeglass lens design how to design so as to have a sex. The spectacle lens design method according to claim 1 or 2,
The far vision parameters, pupillary distance in far vision state, one eye pupil distance, and at least Tsudea Ru eyeglass lens design method of the height of the pupil. In the spectacle lens design method according to any one of claims 1 to 3,
The spectacle prescription values, a spherical power, cylindrical power, at least Tsudea Ru eyeglass lens design method of the astigmatic axis of and addition power. In the spectacle lens design method according to any one of claims 1 to 4,
The spectacle wearer, when it is imaged in the far vision imaging step and the near vision imaging step, the state der Ru eyeglass lens design method wearing spectacles that does not have power. Spectacle lens design method designed eyeglass lens manufacturing how to produce a spectacle lens by according to any one of claims 1-5.

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