JP6297378B2 - Spectacle lens design method, spectacle lens manufacturing method, spectacle lens design system, and spectacle lens design apparatus - Google Patents

Description

The present invention is a spectacle lens design how, spectacle lens manufacturing method, a design device spectacle lens design system and a spectacle lens.

  A distance portion having a refractive power corresponding to a distant view, a near portion having a refractive power corresponding to a near view, and an intermediate portion connecting the distance portion and the near portion by continuously and smoothly changing the refractive power. Are known as progressive eyeglass lenses. In such a progressive spectacle lens, a method of determining the inset amount of the near portion based on individual wear situation data of each wearer and the deflection of the line of sight due to the lens refraction action is known (Patent Document). 1).

JP 2010-237402 A

  In the above-described prior art, the difference in the individual inclination angle before wearing is taken into consideration, but assuming that the face of the wearer is directly in front of the object to be watched, it is symmetrically used on both sides symmetrically. The amount of inset of the part has been determined. However, when a person looks at an object at hand, there are people who tend to face the object to be watched in an oblique direction without directing the face in front of the object to be watched, due to the manner in which the object is held or the wrinkle of the posture. In the prior art, the inset amount of the near portion cannot be appropriately determined for such a wearer.

(1) A spectacle lens design method according to claim 1 includes a distance portion having a refractive power corresponding to a distant view, a near portion having a refractive power corresponding to a close view, and a distance portion and a near portion. A spectacle lens design method for designing a spectacle lens having an intermediate portion that is provided in between and continuously connects refractive power from a distance portion to a near portion, and is a face of a wearer with respect to a near gaze point A measurement step for measuring the orientation of the eye, and a determination step for determining the inset amount of the near portion on the left and right sides based on the difference in convergence angle between the left eye and the right eye according to the orientation of the face measured in the measurement step, It is characterized by having.
(2) A spectacle lens design method according to claim 4 is provided with a distance portion having a refractive power corresponding to a distant view, a near portion having a refractive power corresponding to a close view, and a distance portion and a near portion. A spectacle lens design method for designing a spectacle lens having an intermediate portion that is provided in between and continuously connects refractive power from a distance portion to a near portion, and is a face of a wearer with respect to a near gaze point Obtaining a measurement result of measuring the orientation of the eye, and determining the inset amount of the near-use part for each of the left and right based on the difference in convergence angle between the left eye and the right eye depending on the face orientation of the measurement result It is characterized by.
(3) 請 Motomeko 6 spectacle lens manufacturing method according to is characterized in that to produce a spectacle lens designed by the spectacle lens designing method according to any one of claims 1-5.
( 4 ) The spectacle lens design system according to claim 7 includes a distance portion having a refractive power corresponding to a distant view, a near portion having a refractive power corresponding to a close view, and a distance portion and a near portion. An eyeglass lens design system for designing a spectacle lens having an intermediate portion that is provided in between and continuously connects refractive power from a distance portion to a near portion, and is a face of a wearer with respect to a close gaze point An input device that inputs measurement results obtained by measuring the orientation of the eye, and a design device that determines the inset amount of the near-use part on the left and right sides based on the difference in the convergence angle between the left and right eyes depending on the face orientation of the measurement results It is characterized by having.
( 5 ) The spectacle lens design device according to claim 8 is provided with a distance portion having a refractive power corresponding to a distant view, a near portion having a refractive power corresponding to a close view, and a distance portion and a near portion. An eyeglass lens design apparatus for designing a spectacle lens having an intermediate portion that is provided between and continuously connecting refractive power from a distance portion to a near portion, and is a face of a wearer with respect to a close gaze point The measurement result obtained by measuring the orientation of the left and right eyes is determined based on the difference in the convergence angle between the left eye and the right eye depending on the face orientation of the measurement result. .

  According to the present invention, it is possible to appropriately determine the inset amount of the near portion of the progressive spectacle lens.

It is a figure which shows the outline | summary of the progressive spectacle lens which concerns on one embodiment of this invention. It is a figure explaining the relationship between the direction of a face, and the amount of insets. It is a figure explaining the definition of the direction angle of a face. It is a figure explaining the method of calculating | requiring a left eye convergence angle and a right eye convergence angle. It is a figure explaining the method of determining an inset amount. It is a figure which shows the structure of the supply system of a progressive spectacle lens. It is a flowchart explaining the procedure which provides a spectacles lens.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, when the progressive spectacle lens is described as “upper”, “lower”, “upper”, “lower”, etc., when the progressive spectacle lens is processed for spectacles, It is based on the positional relationship of the lenses.

(Outline of progressive spectacle lens)
FIG. 1 is a plan view showing an outline of the progressive spectacle lens LS according to the present embodiment. In FIG. 1, the progressive spectacle lens LS is in a state before processing the lens according to the shape of the spectacle frame (a state before lashing processing), and is formed in a circular shape in plan view. The progressive spectacle lens LS is disposed on the upper side in the figure when worn, and the lower side in the figure is arranged on the lower side when worn. The progressive spectacle lens LS has a distance portion F, a near portion N, and an intermediate portion P.

  The distance portion F is arranged on the upper part of the progressive spectacle lens LS, and becomes a portion having a refractive power corresponding to a distant view after the progressive spectacle lens LS is processed for spectacles. The near portion N is disposed below the progressive spectacle lens LS, and after the progressive spectacle lens LS is processed for spectacles, has a refractive power corresponding to the near view. The intermediate portion P is disposed between the distance portion F and the near portion N of the progressive spectacle lens LS, and continuously and smoothly changes the refractive power between the distance portion F and the near portion N. This is the part to be connected.

  The progressive spectacle lens LS has a plurality of reference points. Examples of such a reference point include an eye point (also called a fitting point) EP, a distance reference point FV, and a near reference point NV, as shown in FIG. The eye point EP is a reference point when the wearer wears the lens. The distance reference point FV is a measurement reference point for measuring the distance power of the lens. The near reference point NV is a measurement reference point for measuring the near power of the lens in the near portion N.

  Further, a main gazing line M, which is a virtual line on the lens through which the line of sight passes when the wearer sees an object located from the upper front to the lower front, is provided at the approximate center of the progressive spectacle lens LS. The main gazing line M is also called a main meridian, the distance line part Mf passing through the distance part F, the intermediate line part Mp passing through the intermediate part P, and the near line part Mn passing through the near part N. It consists of. The distance line portion Mf passes through the distance reference point FV and the eye point EP, and is formed along the vertical direction during wearing. The near line portion Mn passes through the near reference point NV and is formed along the vertical direction at the time of wearing. In consideration of the congestion at the near vision, the distance line portion Mf has an inset amount H from the nose side ( It is inset on the left side in FIG. The intermediate line portion Mp is formed obliquely with respect to these line segments in order to connect the lower end of the distance line portion Mf and the upper end of the near line portion Mn.

(Determining the amount of inset in the near part)
Next, a method for determining the inset amount of the near portion of the progressive spectacle lens will be described. In the following description, for the sake of simplicity, the description will be made on the assumption that the left and right powers of the progressive spectacle lens are the same. First, an outline of a method for determining the inset amount will be described with reference to FIG.

  FIG. 2 is an overhead view schematically showing the wearer's head At, left eyeball EL, right eyeball ER, left eye progressive spectacle lens LSL, and right eye progressive spectacle lens LSR. . It is assumed that the wearer is looking at a nearby gaze point Pg. Here, the left eye gaze angle αL due to the left eye convergence is defined as the left eye convergence angle αL. The left eye convergence angle αL is an angle formed by the left eye's line of sight when viewing a distant object and the left eye's line of sight when viewing a near object. Also, the right eye gaze angle αR due to the right eye convergence is defined as the right eye convergence angle αR. The right eye convergence angle αR is an angle formed by the line of sight of the right eye when looking far and the line of sight of the right eye when looking near.

  FIG. 2A shows a state in which the wearer's face (head At) is facing directly in front of the gazing point Pg. This state is indicated on the center line of the face (head At) (here, the perpendicular bisector L2 of the line segment L1 connecting the center of the left eye eyeball EL and the center of the right eye eyeball ER). This is a state where the viewpoint Pg is located. In this state, the left eye convergence angle αL and the right eye convergence angle αR are the same angle. Therefore, the inset amount HL of the progressive eyeglass lens LSL for the left eye and the inset amount HR of the progressive eyeglass lens LSR for the right eye are determined to be the same amount. Conventionally, the amount of inset is determined symmetrically on the left and right, assuming that the wearer's face (head At) is facing directly in front of the gazing point Pg.

  However, in daily life, people do not always look at things in front. When looking at an object at hand, such as when reading or operating a mobile device, it is easy to make a difference between people because of the way the object is held and the posture, etc. Some people tend to turn. For example, FIG. 2B shows a state in which the wearer faces the left side of the face with respect to the gazing point Pg. In this state, the gazing point Pg is not on the center line L2 of the face (head At), but on the left side of the center line L2. In this state, the right eye convergence angle αR is larger than the left eye convergence angle αL. For this reason, it is appropriate to set the right eye inset amount HR larger than the left eye inset amount HL. However, in the conventional method, the inset amount is determined symmetrically on the left and right sides. Progressive eyeglass lenses were designed with inset amounts that do not match.

  Thus, for a wearer who tends to turn his / her face obliquely to a nearby gazing point, the conventional method cannot determine the inset amount appropriately. Therefore, in the present embodiment, the inset amount is appropriately determined in consideration of the orientation of the face with respect to the wearer's gazing point Pg.

  Hereinafter, in the present embodiment, a method for determining the inset amount of the near portion in the progressive spectacle lens will be specifically described. In the following description, as shown in FIG. 3, a vertical bisector L2 of a line segment L1 connecting the center of the left eye eyeball EL and the center of the right eye eyeball ER is defined, and the midpoint of the line segment L1 A straight line L3 passing through O and the nearby gazing point Pg is defined, and an angle formed by the vertical bisector L2 and the straight line L3 is defined as a wearer's face orientation angle φ. The orientation angle φ of the wearer's face is 0 degrees when the wearer's face is facing directly in front of the gazing point Pg. That is, the orientation angle φ of the wearer's face is an angle based on the orientation of the face when the wearer's face is directly in front (facing directly) with respect to the gazing point Pg.

FIG. 4 is a diagram for explaining a method for obtaining the left eye convergence angle αL and the right eye convergence angle αR when the wearer's face is not facing the front with respect to the gazing point Pg (that is, facing the oblique direction). is there. FIG. 4 shows a state in which the wearer faces the left side of the face with respect to the gazing point Pg. Here, assuming that the left eye convergence angle and the right eye convergence angle when the wearer's face is facing the front with respect to the gazing point Pg are the temporary convergence angle θ, the wearer is left of the face with respect to the gazing point Pg. As shown in FIG. 4, the left eye convergence angle αL and the right eye convergence angle αR are calculated by the following equations (1) and (2).
αL = θ−φ (1)
αR = θ + φ (2)

Conversely, the left eye convergence angle αL and the right eye convergence angle αR when the wearer is facing the right side of the face with respect to the gazing point Pg are calculated by the following equations (3) and (4).
αL = θ + φ (3)
αR = θ−φ (4)

  In this manner, the left eye convergence angle αL and the right eye convergence angle αR can be calculated using the provisional convergence angle θ and the wearer's face orientation angle φ.

  FIG. 5 is a diagram for explaining a method of calculating the left and right near portion inset amounts based on the difference between the left eye convergence angle αL and the right eye convergence angle αR depending on the face orientation φ as described above. . First, the inset amount of the near portion assuming that the gazing point is directly in front of the wearer's face is obtained as a temporary inset amount Hk. As a method for obtaining the temporary inset amount Hk, for example, as described in Japanese Patent Application Laid-Open No. 2010-237402, the distance power of the wearer, the addition power, the near object distance, the eyeball rotation distance, and the distance use A method of calculating the temporary inset amount Hk by an approximate expression using the interpupillary distance may be used. The near object distance is a distance from the eyeball to the gazing point in the near vision state. The eyeball rotation distance is the distance from the rotation center of the eyeball to the progressive spectacle lens surface. The distance between pupils for distance is the distance between pupils in the far vision state. Further, the method for obtaining the temporary inset amount Hk is not limited to this method, and other methods may be used. As described above, the provisional inset amount Hk may be obtained by a known method, and thus detailed description thereof is omitted.

Next, using the provisional inset amount Hk and the distance (eyeball rotation distance) De from the center of rotation of the eyeball to the progressive spectacle lens surface, the face of the wearer faces the front with respect to the gazing point according to Equation (5). Left eye convergence angle and right eye convergence angle (provisional convergence angle) θ are calculated.
θ = arctan (Hk / De) (5)

  The eyeball rotation distance De can be obtained by adding the distance from the center of rotation of the eyeball to the corneal apex and the distance from the corneal apex to the progressive spectacle lens surface (corneal apex distance). These distances may be preset values or may be measured for each wearer.

  Next, as described above, using the temporary convergence angle θ and the orientation angle φ of the wearer's face, the left eye convergence angle αL according to the expressions (1) and (2) or the expressions (3) and (4). And the right eye convergence angle αR is calculated.

Then, using the left eye convergence angle αL, the right eye convergence angle αR, and the eyeball rotation distance De, the inset amount HL of the left eye and the inset amount HR of the right eye are respectively calculated by the equations (6) and (7). calculate.
HL = De · tan (αL) (6)
HR = De · tan (αR) (7)

  As described above, the left eye inset amount HL and the right eye inset amount HR are determined based on the difference between the left eye convergence angle αL and the right eye convergence angle αR depending on the face orientation angle φ. Thereby, even for a wearer who tends to turn his / her face obliquely with respect to a nearby gazing point, the inset amount of the near-use portion of the progressive spectacle lens can be appropriately determined on each of the left and right sides.

(Progressive eyeglass lens supply system)
Next, a progressive eyeglass lens supply system will be described. FIG. 6 is a diagram illustrating a configuration of a progressive eyeglass lens supply system according to the present embodiment. The progressive eyeglass lens supply system includes a data terminal 101, a data storage unit 107, a design unit 105, and a processing machine control unit 111. The data terminal 101, the design unit 105, and the processing machine control unit 111 may be various types of computers. The data terminal 101 is installed in the spectacle store 10, for example. The design unit 105, the data storage unit 107, and the processing machine control unit 111 are installed in a lens manufacturer's factory 20, for example. The data terminal 101 and the design unit 105 are connected by a line 103 such as the Internet, for example. The design unit 105 and the processing machine control unit 111 are connected by a line 109 such as an intranet, for example. The lens processing machine 113 is connected to the processing machine control unit 111.

(Procedure for providing progressive eyeglass lenses)
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 procedure performed at the eyeglass store is shown on the left side of FIG. 7, and the procedure performed at the lens manufacturer is shown on the right side of FIG. In step S10, the customer determines a spectacle frame to purchase at the spectacle store.

  In step S11, a prescription value (for example, spherical power, astigmatism power, astigmatism axis degree, addition power, etc.) of the spectacle lens attached to the spectacle frame determined in step S10 is 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.

  In step S12, various parameters (fitting parameters) in a state where the wearer wears glasses are measured. As the fitting parameter, for example, distance between pupils for distance, near object distance, corneal apex distance, forward tilt angle (angle of progressive spectacle lens surface with respect to vertical plane) and the like are measured.

  In step S13, the orientation angle φ of the wearer's face with respect to a nearby gazing point is measured. An example of a method for measuring the face orientation angle φ is as follows. First, a measurement cap with the front direction of the wearer's face drawn on the top is put on the wearer's head. And a wearer is made into a near vision state by having a wearer hold a book, a portable terminal, etc. in a hand, and seeing in a natural state. In this state, the front direction of the wearer's face is detected by observing the measurement cap, and the position of the wearer's point of gaze is measured with a known gaze detection device or the like. As a result, the orientation angle φ of the wearer's face with respect to a nearby gazing point can be obtained.

  Note that the method of measuring the face orientation angle φ is not limited to the above-described method, and an appropriate method may be used from various methods. For example, a method of photographing a wearer's face with a camera installed in the vicinity of the gazing point in a state where a measuring jig of a known length is attached to the spectacle frame may be used. In this case, the length of the measurement jig that appears on the captured image differs depending on whether the wearer's face is facing the front direction or the oblique direction with respect to the gazing point. The orientation angle of the face can be obtained based on the length of the measuring jig shown.

  Further, for example, when reading the right end from the left end of the book, the head may be moved together with the line of sight, and the orientation angle φ of the wearer's face may change with time. Therefore, the face orientation angle φ may be continuously measured for a predetermined time, and the average value of the measured values may be used as the face orientation angle φ used for the design of the spectacle lens.

  In step S14, the store clerk of the spectacle store determines the spectacle frame information determined in step S10, the prescription value of the spectacle lens determined in step S11, the fitting parameter measured in step S12, the face orientation angle measured in step S13, and the like. The order information of the spectacle lens including is input to the data terminal 101 installed in the spectacle store. The data terminal 101 transmits the input ordering information to the design unit 105 installed in the lens manufacturer via the line 103.

  In step S20, in the lens manufacturer, the design unit 105 receives spectacle lens ordering information from the spectacle store ordering computer. In step S21, the design unit 105 designs a spectacle lens based on the received progressive spectacle lens ordering information. That is, a spectacle lens is designed based on information such as spectacle frame information, spectacle lens prescription values, fitting parameters, and face orientation angle.

  When designing the spectacle lens, as described above, the design unit 105 calculates the left eye convergence angle αL and the right eye convergence angle αR using the face orientation angle φ, and the left eye inset amount HL and right eye Each eye inset amount HR is determined.

  In step S <b> 22, the design unit 105 outputs the spectacle lens design data designed in step S <b> 21 to the processing machine control unit 111 via the line 109. The processing machine control unit 111 sends a processing instruction to the lens processing machine 113 based on the design data. As a result, the eyeglass lens based on the design data is processed and manufactured by the lens processing machine 113. Then, the spectacle lens manufactured by the lens processing machine 113 is shipped to a spectacle store. In step S15, 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.
(1) The spectacle lens design method is based on a measurement step of measuring the orientation of the wearer's face relative to a nearby gazing point, and a difference in convergence angle between the left eye and the right eye depending on the face orientation measured in the measurement step. And determining steps for determining the inset amount of the near-use portion on the left and right sides, respectively. Specifically, in the measurement step, the face orientation angle φ is measured based on the face orientation when the wearer's face is directly facing the near gazing point as the face orientation, and the determination step Then, based on the difference in the convergence angle of the left eye and the right eye depending on the face orientation angle φ, the inset amount of the near portion is determined for each of the left and right sides. Thereby, even for a wearer who tends to turn his / her face obliquely with respect to a nearby gazing point, the inset amount of the near-use portion of the progressive spectacle lens can be appropriately determined on each of the left and right sides.

(2) In the spectacle lens design method described above, in the determination step, the inset amount of the near-use portion when the wearer's face is directly facing the near gazing point is obtained as the temporary inset amount Hk. Based on the inset amount Hk and the face orientation angle φ, the inset amount of the near portion is determined for each of the left and right sides. Thus, after obtaining the temporary inset amount Hk using a known method, the appropriate inset amount can be easily determined simply by correcting the temporary inset amount Hk using the face orientation angle. .

The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.
(Modification 1)
In the embodiment described above, the inset amount of the near portion when the wearer's face is directly facing the near gazing point is obtained as the temporary inset amount Hk, and the inset amount of the near portion is calculated. Although the example to determine was demonstrated, you may obtain | require directly the inset amount of a near part, without going through temporary inset amount Hk. For example, a ray tracing simulation may be performed using the prescription value of the spectacle lens, the fitting parameter, and the face orientation angle φ, and the inset amount of the near portion may be determined on the left and right sides.

(Modification 2)
In the embodiment described above, an example has been described in which the left eye convergence angle αL and the right eye convergence angle αR are calculated using the temporary inset amount Hk and the face orientation angle φ, and the left and right inset amounts are respectively calculated. However, this need not be the case. For example, if you tend to turn your face to the near gaze point, tend to face your left side to the near gaze point, and right face to the near gaze point 3 patterns of inset amounts are prepared in advance, and the optimal inset amount for the wearer is selected from these 3 patterns of inset amounts using the face orientation measurement results. You may make it do.

  Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. In addition, the present invention can be applied to a perspective-type progressive eyeglass lens, and can also be applied to a middle-range type progressive eyeglass lens.

  LS ... progressive spectacle lens, F ... distance portion, N ... near portion, P ... intermediate portion, 101 ... data terminal, 105 ... design portion, 111 ... processing machine control portion, 113 ... lens processing machine

Claims (8)

A distance portion having a refractive power corresponding to a distant view, a near portion having a refractive power corresponding to a close view, and the distance portion to the near portion provided between the distance portion and the near portion. A spectacle lens design method for designing a spectacle lens having an intermediate portion for continuously connecting refractive powers up to
A measurement process for measuring the orientation of the wearer's face relative to a nearby gazing point;
A determination step of determining the inset amount of the near-use part on each of the left and right sides based on the difference in convergence angle between the left eye and the right eye due to the orientation of the face measured in the measurement step;
An eyeglass lens design method comprising: In the spectacle lens design method according to claim 1,
In the measuring step, as the orientation of the face, an orientation angle based on the orientation of the face when the wearer's face is directly facing the gazing point is measured,
In the determining step, the inset amount of the near-use portion is determined on each of the left and right sides based on a difference in convergence angle between the left eye and the right eye according to the orientation angle measured in the measuring step. Lens design method. In the spectacle lens design method according to claim 2,
In the determination step, an inset amount of the near portion when the wearer's face is directly facing the gazing point is obtained as a temporary inset amount, and the temporary inset amount and the orientation angle are determined. An eyeglass lens design method comprising: determining an inset amount of the near portion based on each of the left and right sides. A distance portion having a refractive power corresponding to a distant view, a near portion having a refractive power corresponding to a close view, and the distance portion to the near portion provided between the distance portion and the near portion. A spectacle lens design method for designing a spectacle lens having an intermediate portion for continuously connecting refractive powers up to
A measurement result obtained by measuring the orientation of the wearer's face with respect to a nearby gazing point is obtained, and based on the difference in the convergence angle of the left eye and the right eye according to the face orientation of the measurement result, A spectacle lens design method comprising a determining step of determining a set amount for each of the left and right sides. Oite the spectacle lens design method according to any one of claims 1 to 4,
In the measurement of the orientation of the face of the wearer, the orientation of the face of the wearer with respect to the near gaze point is measured when an object held by the wearer is set to the near gaze point. An eyeglass lens design method characterized by the above . Spectacle lens manufacturing method characterized by producing a spectacle lens designed by the spectacle lens designing method according to any one of claims 1-5. A distance portion having a refractive power corresponding to a distant view, a near portion having a refractive power corresponding to a close view, and the distance portion to the near portion provided between the distance portion and the near portion. An eyeglass lens design system for designing an eyeglass lens having an intermediate portion for continuously connecting refractive powers up to
An input device for inputting a measurement result obtained by measuring the orientation of the face of the wearer with respect to a nearby gazing point;
A design device that determines the amount of inset of the near-use part on each of the left and right sides based on the difference in convergence angle between the left eye and the right eye depending on the orientation of the face of the measurement result;
An eyeglass lens design system comprising: Refracting power from the distance portion to the near portion provided between the distance portion having the refractive power corresponding to the distant view, the near portion having the refractive power corresponding to the close view, and the distance portion and the near portion. A spectacle lens design device for designing a spectacle lens having an intermediate portion for continuously connecting
A measurement result obtained by measuring the orientation of the wearer's face with respect to a nearby gazing point is obtained, and based on the difference in the convergence angle of the left eye and the right eye according to the face orientation of the measurement result, A spectacle lens design apparatus characterized in that a set amount is determined on each of left and right sides.

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