JP2009092509A - Eyeglass measuring tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eyeglass measuring tool for simply and easily measuring a warpage angle of an eyeglass lens. <P>SOLUTION: The eyeglass measuring tool 1 is provided with a plate 2 comprising a light transmission material. A measuring section A is provided so as to measure the warpage angles of left and right eyeglass lenses mounted to an eyeglass frame at a light transmission section 3a in the front of the plate 2. The warpage angle measuring section A comprises: a warpage angle measuring horizontal reference line 20; a plurality of indication scales 21a-21e intersecting the horizontal reference line 20 at different angles; and a left lens warpage angle indication scale 21L and a right lens warpage angle indication scale 21R symmetrically indicated. Values 23 for representing inclination angles to the horizontal reference line 20 are indicated in the indication scales 21a-21e. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a spectacle measuring instrument for measuring a warp angle of a spectacle lens, and further, a pupil distance, a vertex distance, a lens tilt angle, a convex curve, a lens diameter, a downward rotation amount of a pupil, an eye point height, and the like. The present invention also relates to a measuring instrument for spectacles that makes it possible to also measure.

  When trimming the lens lens (unprocessed lens) to fit the shape of the left and right frame parts of the spectacle frame, the eyepoints of the right and left eyes of the spectacle wearer (when the spectacle frame is worn, If the pupil position of the left and right eyes of the wearer (hereinafter also referred to as IP) is shifted from the optical center of the left and right lenses, the feeling of wearing is greatly affected. The distance from the center of the lens to the left and right pupils (one eye PD) is accurately measured to determine the distance between the optical center points of the left and right lenses, and the optical center of each lens and the IP of the left and right eyes match each other. It is necessary to process the lens. For this reason, for example, PDs and one-eye PDs are measured using measuring instruments disclosed in Patent Documents 1, 2, 3, and the like.

  In addition, when framed with a rimmed spectacle lens, especially a progressive multifocal lens for both near and near, the distance line of sight of the wearer passes through the distance center of the eyeglass lens, and the near line of sight passes through the near center. Thus, since it is necessary to put the frame in the frame, measurement of such far and near line of sight is also performed (see, for example, Patent Documents 4 and 5).

  By the way, the warp angle of the spectacle lens is an inclination angle in the front-rear direction in the horizontal plane with respect to the horizontal line in the state where the spectacles are worn. ) When it is tilted so as to be located further forward, it is called outward warp, and conversely, when it is tilted so that the bridge side edge is located behind the temple side end edge, it is called inward warp. Basically, it is desirable that the warp angle of the lens is zero and the direction of the line of sight (visual axis) coincides with the optical axis of the lens. For this reason, general spectacles are adjusted so that the lens is held in front and parallel to the left and right eyes.

  If the warp angle of the lens is shifted and the line of sight and the optical axis are inclined (oblique), not only the front view but also the appearance is greatly affected. That is, since the refractive index in the oblique direction increases, in the case of an outward curvature lens, the retinal image appears to be reduced in the horizontal direction at minus power for myopia, and the retinal image is enlarged in the horizontal direction at plus power for hyperopia. Looks like. In addition, since the eyes are binocularly viewed, if the line of sight is turned to the side, the left and right eyes will be seen with different oblique light angles, and in near vision, In addition, since the oblique angle becomes larger, the uncomfortable feeling at the time of wearing is amplified, so that a sufficient check of the warp angle is necessary.

  In particular, in general, glasses for eyesight correction are also shaped like sunglasses and require a deep lens curve, and the number of protruding frames (excursion) has increased. When setting (curve and position), it is necessary to be careful to minimize the deviation between the completed glasses and each lens when worn.

JP 2001-161645 A JP-A-8-98810 Japanese Utility Model Publication No. 5-64824 Japanese Utility Model Publication No. 63-120225 JP-A-6-138422

  However, there is still no measuring tool for measuring the warp angle of the spectacle lens, and there is a demand for the development of a warp angle measuring tool that can be measured easily at low cost.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a spectacle measuring instrument that can easily and easily measure the curvature angle of a spectacle lens. It is in.

  In addition to the measurement of the warp angle, the present invention is also capable of measuring the tilt angle of the lens (forward tilt angle), the distance between the vertices, the distance between the pupils, the convex curve, the lens diameter, the downward rotation amount of the pupil, and the eye point. It is an object of the present invention to provide a spectacle measuring tool that can measure height and the like and can easily check the lens specifications.

  In order to achieve the above object, the present invention is a plate made of a light-transmitting material, and a measuring part for measuring the curvature angle of the left and right eyeglass lenses mounted on the eyeglass frame is provided on the light-transmitting portion of the plate. The warp angle measurement unit is composed of a horizontal reference line for measuring the warp angle and a plurality of display graduations intersecting the horizontal reference line at different angles, and the warp angle for the left lens displayed symmetrically. A display scale and a warp angle display scale for the right lens are provided, and a numerical value indicating an inclination angle with respect to the horizontal reference line is displayed on each display scale.

  In the present invention, the plate is provided with a measurement unit for measuring the inclination angle of the spectacle lens, and the inclination angle measurement unit is provided for each of the inclination angle measurement vertical reference line and the measurement vertical reference line. A plurality of display scales for tilt angle measurement intersecting at different angles are provided, and each display scale displays a numerical value indicating the tilt angle with respect to the vertical reference line.

  In the present invention, the plate is provided with a measurement unit for measuring the distance between the vertexes of the spectacle lens and the pupil, and the distance measurement unit between the vertexes includes a display scale for measuring the distance between the vertexes. A numerical value indicating the distance is displayed.

  According to the present invention, an interpupillary distance measuring unit for measuring an interpupillary distance is provided on the plate. The interpupillary distance measuring unit includes a PD horizontal reference line indicating a datum line of a frame frame, and the PD A left-eye pupil horizontal position reading display scale and a right-eye pupil horizontal position reading display scale for reading the horizontal position of the left and right pupils with respect to the horizontal reference line On the display scale for position reading, a numerical value indicating a half value of the distance between the geometric center points of the left and right frame frames is displayed.

  Further, in the present invention, the interpupillary distance measurement unit includes a distance pupil distance measurement unit that measures a distance pupil distance and a near pupil distance measurement unit that measures a near pupil distance. is there.

  Further, the present invention is provided with an expanded portion integrally at the edge portion of the plate, and provided with a measuring unit for measuring the convex curve of the spectacle lens at the edge of the expanded portion. A plurality of concave curved surface portions formed corresponding to the convex curve of the spectacle lens are provided, and a numerical value indicating the convex curve is displayed on each concave curved surface portion.

  In the present invention, the plate is provided with a measurement unit for measuring the lens diameter, and the lens diameter measurement unit is a plurality of lens diameter measurement curves displayed concentrically corresponding to various lens diameters. Each curve is displayed with a numerical value indicating the corresponding lens diameter.

  In the present invention, the plate includes a measurement unit that measures the downward rotation amount of the left and right eyes. The rotation measurement unit includes a left-eye rotation measurement display scale that reads the downward rotation amount of the left eye, and a right eye. And a display scale for measuring the right eye rotation for reading the downward rotation amount, and a numerical value indicating the downward rotation amount is displayed on each display scale.

  Further, the present invention is provided with a measurement unit for measuring the eye point height on the plate, and the eye point height measurement unit includes an eye point height measurement display scale for reading the eye point height. A numerical value indicating the height of the eye point is displayed on the display scale.

  In the present invention, the plate is provided with a measuring unit for determining visual acuity.

  Further, according to the present invention, the visual acuity determination measuring unit includes a plurality of pinholes having different hole diameters.

  In this invention, since the curvature angle measurement part is provided, it can measure whether a spectacles lens is outward curvature or internal curvature.

  In the present invention, since the tilt angle measuring unit is provided, the tilt angle of the spectacle lens can be measured.

  In the present invention, since the inter-vertex distance measuring unit is provided, the rear-side apex of the lens and the apex of the front of the cornea (inter-vertex distance) can be measured.

  In the present invention, the distance-to-distance and near-distance pupil distance measuring units are provided, so that the distance-to-distance distance pupil and the near-distance distance between the pupils can be measured.

  In the present invention, since the convex curve measuring unit is provided, the convex curve of the lens can be measured.

  In the present invention, since the lens diameter measuring unit is provided, the lens diameter can be measured.

  In the present invention, since the rotation measurement unit is provided, the downward rotation amount of the left and right eyes can be measured.

  In the present invention, since the eye point height measuring unit is provided, the eye point height can be measured.

  Furthermore, in the present invention, since the visual acuity determination measuring unit is provided, it is possible to measure whether or not visual acuity correction using a normal lens or a contact lens is possible.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
FIG. 1 is a front view showing an embodiment of a spectacle measuring instrument according to the present invention, and FIG. 2 is a rear view of a main part of the spectacle measuring instrument. In these drawings, a spectacle measuring instrument generally indicated by reference numeral 1 includes a plate 2 made of a transparent material. The plate 2 is formed in a substantially J-shape when viewed from the front by a transparent plastic plate having a thickness of about 1 mm, so that a substantially rectangular plate body 2A that is long in the left-right direction and one side edge of the plate body 2A. It is comprised by the expansion part 2B extended integrally. Further, the plate 2 forms a transparent portion 3a in the lower half from the central portion in the height direction and a transparent portion 3b in the upper half over substantially the entire length. The plate 2 having the transparent portion 3a and the opaque portion 3b is formed by a well-known two-color molding method or easily manufactured by sticking an opaque sheet to the portion to be the opaque portion 3b. Can do.

  The plate body 2A has a size of about 145 mm × 43 mm, a rectangular cutout 4 of 4 × 4 mm is formed in the upper right corner, and a pair of left and right pupillary distance measurement windows 5L, 5R are formed in the center in the height direction. In addition, a V-shaped recess 7 is formed in the center of the lower edge 6. Each inter-pupil distance measurement window 5L, 5R is formed of a long hole in the left-right direction having a length of about 33 mm and a width of about 12 mm, and the longitudinal center line is a horizontal line 8 indicating the boundary between the transparent portion 3a and the opaque portion 3b. It is formed to match. The horizontal line 8 is a horizontal line passing through the center O of the frame body 2A, and indicates a datum line of the frame (a virtual horizontal line connecting the geometric center points of the left and right frame portions (frame frame) in the spectacle frame). A horizontal reference line for PD is formed. “The geometric center point of the left and right frame parts” is a point determined by an intermediate position between the left end and the right end of the lens to be attached to each frame part and an intermediate position between the upper end and the lower end of the lens shape. It is.

  Further, the pupil distance measurement windows 5L and 5R are formed so as to be spaced apart at equal distances on both sides of the center O of the plate body 2A. The distance between the pupil distance measurement windows 5L and 5R is about 27 mm.

  The concave portion 7 is provided to prevent the subject's nasal bridge from coming into contact with the lower end edge 6 of the plate body 2A when measuring the spectacle lens, and is positioned directly below the vertical line 9 passing through the center O. Is formed.

  The expanding portion 2B is formed of a substantially trapezoidal protruding portion integrally projecting on the left edge of the plate body 2A, and the upper end edge 10 has the same height as the upper end edge 11 of the plate body 2A and has a length of about 37 mm. And the bottom edge extends about 20 mm below the left edge of the plate body 2B, and the left edge 13 connecting the left edge 10a of the upper edge 10 and the lower edge 12a of the right edge 12 has four concave curved surfaces with different radii of curvature. It is comprised by the parts 14a-14d and the five linear surface parts 14e-14i. The concave curved surface portions 14a to 14d and the linear surface portions 14e to 14i are alternately formed.

  In the front surface of the plate 2, the transparent portion 3 a and the opaque portion 3 b include a total of 10 measurement units, that is, a curvature angle measurement unit A, a distance pupil distance measurement unit B, and a near pupil distance measurement unit. C, inter-vertex distance measuring unit D, inclination angle measuring unit E, convex curve measuring unit F, lens diameter measuring unit G, convolution measuring unit H, eye point height measuring unit I and measurement for eyesight determination Part J is provided. When the distance pupil distance measuring unit B and the near pupil distance measuring unit C are collectively referred to, they are simply referred to as an interpupillary distance measuring unit.

  The warp angle measurement unit A is a part for measuring the warp angles of the left and right eyeglass lenses, and intersects the warp angle measurement horizontal reference line 20 and the warp angle measurement horizontal reference line 20 at intervals of 5 °. It has six angle display scales 21a to 21f, and includes a left lens warpage angle display scale 21L and a right lens warpage angle display scale 21R that are displayed symmetrically across the vertical line 9. The horizontal reference line 20 for measuring the warp angle is displayed below and parallel to the horizontal reference line 8 so as to coincide with the lower edges of the inter-pupil distance measuring windows 5L, 5R. On each of the angle display scales 21a to 21f, numerical values 23 of −5 °, 5 °, 10 °, 15 °, 20 °, and 25 ° indicating the inclination angle with respect to the horizontal reference line 20 for PD are displayed. The display scale 21a is positioned above the warp angle measurement horizontal reference line 20, and displays the inward warp angle of the spectacle lens of −5 °. The display lines 21b to 21f are positioned below the horizontal reference line 20 for measuring the warp angle, and display the eyeglass lens's outward warp angles of 5 °, 10 °, 15 °, 20 °, and 25 °, respectively. In addition, about the display scale 21f, since it overlaps with another display scale, the angle display is abbreviate | omitted.

  The distance-to-pupil distance measuring unit B is a part that measures the distance between the distance pupils (FPD) when viewing from a distance, and includes the inter-pupil distance measurement windows 5L and 5R, and the horizontal reference line 8 for PD. A left-eye distance pupil horizontal position reading display scale 26L and a right-eye distance pupil horizontal position reading display for reading the horizontal position of the left and right eye pupils with respect to the PD horizontal reference line 8, respectively. And a scale 26R. The pupil horizontal position reading display scales 26L and 26R are displayed at intervals of 1 mm along the upper edges of the inter-pupil distance measuring windows 5L and 5R, respectively, and the distance from the center O of the plate body 2A is indicated. Numerical values 27 of 20 mm, 30 mm, and 40 mm are displayed. This numerical value 27 is half the distance between the geometric center points of the left and right frame frames, and indicates a single eye PD with a distance between the far pupils (FPD).

  The near-pupil distance measuring unit C is a part that measures a near-pupil distance (NPD) during near vision, and includes the inter-pupil distance measuring windows 5L and 5R and a PD horizontal reference line. 8, a left-eye near-eye pupil horizontal position reading display scale 30 </ b> L and a right-eye near-eye pupil horizontal position reading for reading the horizontal position of the left and right pupils with reference to the PD horizontal reference line 8. And a display scale 30R. The pupil horizontal position reading display scales 30L and 30R are displayed at intervals of 1 mm along the lower edge 6 of the plate body 2A and the lower edges of the inter-pupil distance measurement windows 5L and 5R, respectively. Numerical values 31 of 20 mm and 30 mm indicating the distance from O are respectively displayed. This numerical value 31 is a half value of the distance between the geometric center points of the left and right frame frames, and indicates a single eye PD having a near interpupillary distance (NPD).

  The inter-vertex distance measuring unit D is a part that measures the distance (inter-vertex distance) between the rear apex of the lens and the apex of the front of the cornea and is used for measuring the inter-vertex distance that enables measurement from the side of the subject. A display scale 33 and two inter-vertex distance measurement display scales 34 and 35 that enable measurement from above the spectacle frame are provided. Display scales 33 for measuring the distance between vertices enabling measurement from the side are displayed at an interval of 1 mm above the horizontal reference line 8 for PD so as to extend rightward from the left end of the plate body 2A. A numerical value 36 of 5 mm, 10 mm, 15 mm, 20 mm, and 25 mm indicating a distance (distance between vertices) from the vertical line 37 orthogonal to the PD horizontal reference line 8 is displayed. The vertical line 37 coincides with the left side edge of the plate body 2A, in other words, the right side edge 12 of the expanded portion 2B.

  The display scale 34 for measuring the distance between the apexes is displayed at 1 mm intervals along the right edge 12 of the expanded portion 2B, and the numerical value 38 indicating the distance between the apexes with the lower end 12a of the expanded portion 2B being zero is upward at 5 mm intervals. It is displayed.

  The inter-vertex distance measurement display scale 35 is displayed at an interval of 1 mm from the vertical line 37 toward the left end 39 of the expanded portion 2B, and a numerical value 40 indicating the distance from the vertical line 37 (inter-vertex distance) is 5 mm. Displayed at intervals. The left end 39 of the expanded portion 2B is located on the horizontal reference line 8 for PD and forms a substantially vertical flat surface 14f.

  The tilt angle measuring unit E is a portion for measuring the tilt angle (forward tilt angle) of the spectacle lens, and the tilt angle measuring vertical reference line 42 and three crossing the vertical reference line 42 at different angles. Inclination angle measurement display scales 43a to 43c, and the display scales 43a to 43c have numerical values 44 of 5 °, 10 °, and 15 ° indicating the forward inclination angle of the spectacle lens with respect to the vertical reference line 42 for inclination angle measurement. Are displayed. The tilt angle measuring vertical reference line 42 is formed near the right end of the plate body 2 </ b> A, and its upper end substantially coincides with the corner of the rectangular cutout 4.

  The convex curve measuring part F is a part for measuring the convex curve (L curve) of the spectacle lens, and is formed on the left edge 13 of the spread part 2B. The concave curved surface portions 14a to 14d have 6 and 8 curves (BC), and numerical values 46 of 2, 4, 6, and 8 indicating the convex curved curves of the lens are displayed on the concave curved surface portions 14a to 14d. Table 1 shows the relationship between the convex curve converted with the refractive index Nd = 1.53 and the radius of curvature.

The lens diameter measuring part G is a part for measuring the lens diameter, and five lens diameters formed concentrically on the expanded part 2B around the intersection O ₁ between the horizontal reference line 8 for PD and the vertical line 37. Measurement curves 48a to 48e are provided, and each curve 48a to 48e displays a numerical value 49 of 55φ, 60φ, 65φ, 70φ, 75φ, and 80φ indicating the corresponding lens diameter.

  The rotation measurement unit H is a part that measures the downward rotation amount of the left and right eyes, and is a left-eye rotation measurement display scale 50L that reads the downward rotation amount and a right-eye rotation measurement display scale 50R that reads the downward rotation amount of the right eye. And. These display scales 50L and 50R are displayed obliquely upward from the lower edge 6 on both sides of the concave portion 7 of the plate body 2A, and numerical values 51 of 5 and 10 indicating the amount of rotation in the height direction are displayed. ing. Each display scale 50L and 50R is displayed as a pair of left and right parallel scales. These display scales 50L and 50R also serve as scales for measuring the distance between vertices (described later).

  The eye point height measuring part I is a part for measuring the eye point height (EPHI), and two eye point height measuring display scales displayed at 1 mm intervals on the left end of the plate body 2A and the expanded part 2B. 53A and 53B are provided, and on these display scales 53A and 53B, a numerical value 54 indicating the height of the eye point is displayed at intervals of 5 mm. The display scales 53A and 53B for measuring the eye point height form the same scale as the display scales 33 and 35 for measuring the distance between vertexes.

  The visual acuity determination measuring portion J is a portion for measuring whether or not visual acuity correction using a normal lens or contact lens is possible, and two pinholes (PH) 55a and 55b formed in the opaque portion 3b of the spread portion 2B. It has. The hole diameters of the pinholes 55a and 55b are 1 mmφ and 2 mmφ, respectively, and inspection is performed using the one that is convenient for the subject.

  Further, on the surface of the plate 2, in addition to the above-described ten measurement parts A to J, a near point index K, a simple calculation conversion table 65 and a ruler M are displayed, and a ruler M and a simpler are displayed on the upper back side. The calculation conversion tables 66 and 67 are displayed.

  The near point index K is for measuring a near point distance, and is displayed around a part of the horizontal reference line 8 for PD, a vertical line 9 orthogonal thereto, and these lines 8 and 9. And four thick L-shaped lines 60.

  The ruler M is formed along the upper end edge 11 of the plate body 2A, and has a length of 140 mm from the vertical wall of the notch 4 at 1 mm intervals.

  The calculation conversion tables 65, 66, and 67 are displayed between the ruler M and the pupil distance measurement windows 5L and 5R. The calculation conversion tables 65, 66, and 67 will be described later.

  Table 2 shows a list of the measurement items and the simple calculation tables 65 to 67 of the eyeglass measuring tool 1 described above.

Next, a measuring method using the measuring units A to J and the near point index K by the eyeglass measuring tool 1 will be described with reference to FIGS.
3 to 4 are diagrams for explaining the measurement of the warpage angle of the eyeglass lens. FIG. 3 shows the measurement of the outward curvature angle, and FIG. 4 shows the measurement state of the internal curvature angle. When measuring the warp angle, the plate 2 is placed on the eyeglass frame 70 with the front surface on which the various measurement parts A to J are displayed facing upward and horizontally and reversed left and right. Then, the horizontal reference line 20 for measuring the warp angle is aligned with the rear end surface of the bridge side rim, and the angle display scales (21a to 21f) of the warp angle display scales 21L and 21R for the left lens and the right lens are positioned on the rear side of the ear rim. ) And the warp angles of the left and right lenses 71L and 71R are read from the matching angle display scale. For example, as shown in FIG. 3, when the position of the rear surface of the ear side rim is located between the angle display scales 21b and 21c, the outer curvature angle is measured as 12.5 °. Also, as shown in FIG. 4, when the position of the rear surface of the ear side rim coincides with the angle display scale 21a, the inner curvature angle is measured as -5 °. Thus, it is possible to easily measure the curvature angle of the glasses when the subject wears the glasses. As a result, it is possible to confirm whether the left and right lenses 71L and 71R have the same curvature angle.

  Here, in measuring the warp angle, the plate 2 is measured upside down, so that the left and right lens warp angle display scales 21L and 21R are subscripts (L: Left) and R (Right) are left and right and are confusing, because this is to maintain consistency with the subscripts of the other scales 26L, 26R and interpupillary distance measurement windows 5L, 5R. . In actual measurement, if the warping angle is read while ignoring the subscripts L and R, it is not a problem. Further, since the curvature angle display scales 21L and 21R are displayed on the transparent portion 3a, if the plate 2 is used upside down (because the scale can be read), the lenses 71L and 71R and the curvature angle display scale are used. The subscripts L and R of 21L and 21R can be matched and read.

FIG. 10 is a diagram for explaining the measurement of the tilt angle (forward tilt angle) of the lens.
In measurement, the plate 2 is held horizontally, and the upper part of the lens or the rear (or front) of the upper rim of the spectacle frame 70 is aligned with the vertical reference line for tilt angle measurement, and the lower edge of the lens 71 or the rear surface of the lower rim The position is measured by the tilt angle measurement display scales 43a to 43c, and the tilt angle is read.

  A spectacle lens is designed to best correct aberrations in its refractive system when the line of sight coincides with the principal axis of the lens. On the other hand, when viewing from a distance, the line of sight is inclined downward by 5 to 10 ° with respect to the horizontal line. Therefore, it is necessary for the far spectacles to give a forward tilt angle of 5 to 10 ° to the frame frame in order to make the common visual line coincide with the optical axis of the lens. The near eyeglasses are set to have a forward tilt angle of 12 to 15 ° on the assumption that the glasses are viewed downward at hand. It is desirable to set the forward tilt angle to 10 to 12 degrees for the bifocal type. Based on the above, it is important to measure and confirm whether or not the forward tilt angle is properly maintained before and after making glasses.

7 to 9 are diagrams for explaining the measurement of the distance between the vertices. FIGS. 7 and 9 show a state in which the distance is measured from above, and FIG. 8 shows a state in which the distance is measured from the side.
In FIG. 7, when measuring the distance between the vertices from above, the flat surface 14i of the spread part 2B of the plate 2 is aligned with the corneal vertex W, and the distance to the front vertex Q of the lens 71 is measured to measure the distance between the vertices. A value obtained by subtracting the center thickness of the lens 71 from the display scale 34 is defined as a distance between vertices. Similarly, when the flat surface 14f of the expanded portion 2B is aligned with the corneal apex W, the distance to the front apex Q of the lens is read by the inter-vertex distance measurement display scale 35, and the value obtained by subtracting the center thickness of the lens 71 is obtained. Can be the distance between vertices.

  When reading from the side of the subject, as shown in FIG. 8, the front vertex Q of the lens 71 is aligned with the horizontal reference line 8, the distance to the cornea vertex W is measured, and the inter-vertex distance measurement display scale 33 is used. The value obtained by reading and subtracting the thickness of the lens 71 is defined as the distance between the vertices. In the present embodiment, the upper half of the plate 2 is the opaque portion 3b and the vertex distance measurement display scale 33 is displayed on the opaque portion 3b. The vertex distance measurement display scale 33 is displayed. If the portion to be transparent is made a transparent portion, it is easy to measure the distance between the vertices using the scale 33 even when there is a measuring tool between the subject and the measurer.

  It is necessary to keep the distance between the apexes approximately 12 mm (in JIS, the precondition for lens design is 27 mm from the rotation center S of the eye). If the distance is more than 12 mm, the refractive power of the lens shifts to the plus side for the wearer and myopia is weak and the hyperopia feels strong. If the distance is closer than that, the refractive power of the lens shifts to the negative side for myopia. It is important to measure and confirm whether or not the eyeglasses are properly held at the same distance before and after making glasses.

  FIG. 9 is a diagram for explaining another measurement method for measuring the distance between vertices from above. At the time of measurement, the plate 2 is placed sideways, the front surface is directed upward, and the recess 7 is positioned below the spectacle frame 70 so as to coincide with the nose bridge. Then, the lower end 6 of the plate 2 is aligned with the corneal apex W, the distance to the front apex Q of the lens 71 is measured, read by the display scales 50L and 50R, and the value obtained by subtracting the center thickness of the lens 71 is the inter-vertex distance. To do. In this case, since the measurement is performed by matching the measurement subject's nasal bridge with the concave portion 7 of the plate 2, it is easy to confirm whether the distance between the left and right vertices is equal.

FIG. 5 is a diagram for explaining the measurement of FPD.
In measurement, the V-shaped concave portion 7 of the plate 2 is placed on the subject's nasal bridge 90, and the positions of the left and right pupils PL and PR are confirmed by the left and right pupil distance measurement windows 5L and 5R. To the center of each pupil is read by the left-eye distance pupil horizontal position reading display scale 26L and the right-eye distance pupil horizontal position reading display scale 26R. At that time, when measuring the FPD of the right eye of the subject, a target 73 such as a fingertip is placed in front of the subject, and the subject is gazed (first eye position), and the left side of the measurer is behind that. The center of the pupil PR is read by the eye SL by the right-eye distance pupil horizontal position reading display scale 26R. When measuring the FPD of the left eye, the FPD of the pupil PR of the subject's left eye is read by the right eye SR of the subject by the left-eye distance pupil horizontal position reading display scale 26L in the same manner.

FIG. 6 is a diagram for explaining the measurement of NPD.
In measurement, the V-shaped concave portion 7 of the plate 2 is placed on the subject's nasal bridge, the left and right pupil positions are confirmed by the left and right pupil distance measurement windows 5L and 5R, and the left and right pupil centers are centered from the nasal bridge center. Is read by the left-eye near pupil horizontal position reading display scale 30L and the left-eye distance pupil horizontal position reading display scale 30R. At that time, when measuring the FPD of the subject's left eye, the target 73 such as a fingertip is placed slightly in front of the subject's left eye in the near work distance D, and he / she gazes at this. From the rear of the extension line, the center of the pupil is read by the left eye SL of the measurer with the left-eye-distance pupil horizontal position reading display scale 30L. When measuring the NPD of the right eye, the distance between the near pupils of the subject's right eye is read by the right eye SR of the subject using the right-eye near pupil horizontal position reading display scale 30R in the same manner.

FIG. 11 is a diagram for explaining the measurement of the convex curve of the lens.
To measure the convex curve, an approximate curve is read by the dummy lens 95 and used as a guide for lens selection and bevel curve selection.

  At the time of measurement, it is measured which of the concave curved surface portions 14a to 14d the convex surface of the dummy lens 95 coincides with, and if they coincide, the numerical value displayed on the concave curved surface portion is read. For example, when it substantially coincides with the concave curved surface portion 14c, it is measured as 6 curves. For example, when it is larger than the radius of curvature of the concave curved surface portion 14b and smaller than the radius of curvature of the concave curved surface portion 14c, it is measured as 7 curves which are intermediate curves.

  If the lens curve is not taken into account, there is a risk that the viewing angle will be further deteriorated if the oblique angle increases in relation to the warp angle or if the lens curve changes due to excessive frame insertion. is there. In addition, changes in the lens curve due to excessive frame insertion cause a great stress on the lens itself and cause a great tension on the coating film on the surface, thus promoting the cracking of the coating film and scratches and cracks. Since this will lead to the promotion of film peeling starting from the point of view, it will have a great influence not only on the appearance but also on the life of the lens. In particular, since the shape of a lens frame with a narrow vertical width has been increasing recently, in the case of such a frame, if the lens curve and the processing curve are not taken into consideration, the frame becomes deep in the lateral direction when the frame is completed. For this reason, it is expected that various risks can be reduced by checking the convex curve with the measuring instrument 1 for eyeglasses before and after placing the frame.

FIG. 12 is a diagram for explaining the measurement of the lens diameter.
At the time of measurement, the intersection point O ₁ between the horizontal reference line 8 for PD and the vertical line 37 that is the geometric center of the measurement part of the lens diameter measurement part G is made to coincide with the eye point position T on the spectacle frame. Then, measured by the maximum radius (maximum effective diameter) as the lens diameter measuring curve 48a~48e the distance D ₁ of the from the intersection O ₁ of the eyeglass frame 70 to the most distant sites.

By checking the maximum effective diameter (D ₁ ) in advance in the processing layout based on the subject's interpupillary distance (FPD, NPD), eyepoint height, and other data, It can be determined whether or not the lens 71 can be edge printed. On the other hand, in the case of a plus lens, it can be used as a basis for specifying an outer diameter for finishing thinner than processing with a standard diameter.

FIG. 13 is a diagram for explaining the measurement of the downward rotation amount.
At the time of measurement, the V-shaped concave portion 7 of the plate 2 is applied to the subject's nasal bridge 90, and the positions of the left and right pupils PL, PR are confirmed by the left and right pupil distance measurement windows 5L, 5R. In addition, the height of the pupil center at the first eye position is set on the horizontal reference line 20 for warp angle measurement, and the lower side is visually recognized in a state where the face of the subject and the plate 2 are fixed. The approximate downward rotation amount and / or rotation angle of both eyes is determined by the left-eye rotation measurement display scale 50L and the right-eye rotation measurement display scale 50R displayed immediately below the pupillary distance measurement windows 5L and 5R. measure.

  When measuring the downward rotation amount, the mirror table 80 is used as an auxiliary tool, and the small circle 80a displayed at the center thereof is adjusted to the near work target distance D of the subject. Further, the distance between the plate 2 and the corneal apex is about 12 mm, and the inclination angle of the lens is about 12 °. The reflected image of the pupil PL of the left eye of the subject reflected at the center of the mirror table 80 is viewed with the left eye SL of the measurer, and the left eye rotation measurement display scale 50L reflected in the reflected image is used. Measure the pupil center. Similarly, when the reflected image of the pupil PR of the right eye of the subject reflected by the mirror table 80 is viewed by the right eye SR of the measurer, the pupil center is determined by the display scale 50R for measuring the right eye rotation reflected in the reflected image. taking measurement.

  The rotation angle can be obtained by a trigonometric function tan θ = a / b, where a is the downward rotation amount, b is the distance from the rotation center S to the lens position, and θ is the rotation angle. The rotation angle θ is a value obtained by approximately doubling the lower rotation amount a when the distance b is measured as 27 mm (JIS). For example, the lower rotation amount a is 10, 11, 12, 13, 14, 15 mm. In this case, the rotation angle θ is 20.3 °, 22.2 °, 24.0 °, 25.7 °, 27.4 °, and 29.1 °.

  If such a mirror table 80 is used, it is possible to measure near-field PDs. When measuring near-field PD, subject and measurer face each other across mirror table 80, and measure pupil's measurement eye on extension line of sight reflected by mirror table 80 of non-measurement person, and confirm pupil position To do.

FIG. 14 and FIG. 15 are diagrams for explaining the eyepoint height measurement.
FIG. 14 shows the eye point height measured by aligning the vertical center line (datum line) DL of the frame with the position of the eye point IP on the horizontal reference line 8 for PD (position 0 of the scale 53A). The state which is measuring with the display scale 53A is shown.

  FIG. 15 shows a state in which the lowermost end of the frame 100 is made to coincide with the flat surface 14f of the expanded portion 2B, and the IP position is measured as a distance from the flat surface 14f by the eye point height measurement display scale 53B. Show.

  In FIG. 16, the visual acuity determination measuring portion J is composed of 1 mm and 2 mm pinholes 55a and 55b as described above, the small diameter pinhole 55a is low, the middle-aged person, and the large diameter pinhole 55b have insufficient light quantity. For the elderly who are easy to do. When the index is viewed through the pinhole 55a or 55b, the depth of focus becomes deep due to the aperture effect, and focusing is facilitated, thereby improving visual acuity. By utilizing this principle, it is possible to easily determine the refraction correction effect.

  When determining visual acuity, one eye looks into one of the pinholes 55a and 55b to visually recognize a distant or near indicator. Next, it is visually recognized without passing through the pinhole 55a or 55b. Then, it compares the appearance when viewed through a pinhole and when viewed through a pinhole. When viewing through a pinhole, it is judged that if the visual acuity is improved, it is possible to improve the visual acuity with a general lens or contact lens. If the visual acuity does not improve, the optical response outside the eyeball is unlikely to improve. Judge.

FIG. 17 is a diagram for explaining the measurement of the near point distance by the near point index K.
The plate 2 is moved back and forth, and the near point distance D when the near point index K becomes unclear is measured separately with a tape measure or the like, and the eye accommodation force is calculated from the measured value. In the measurement, the measurement is performed a plurality of times, the average value thereof is obtained, and the adjustment force is calculated.

  The near point index K is composed of the combination of the thin cross lines 8 and 9 and the L-shaped thick line 60 as described above, and when the visual acuity is insufficient due to the degree of near vision, the thick line 60 is noted. When the visual acuity is sufficient, attention is paid to the thin lines 8 and 9 to determine whether the lines are clear or unclear. The magnitude of the adjustment power of the subject is an important factor in determining the near-field refractive index, and the extra increase in the refractive index improves the usability of the distance type.

In FIG. 1, the simplified calculation table 65 shows the frequency in the upper stage and the distance f (cm) in the lower stage, the adjustment power in the near-point distance measurement, and the far-point distance prediction using the near-correction power. It is a simple calculation table applied to near point distance calculation. The formula for frequency and distance is given by
D = 100 / f, f = 100 / D
Where f: focal length → D: lens power
f: distance from far point → D: degree of refractive error
f: Near-point distance → D: Adjustment power 100 / (refractive anomaly + wear lens power) = far point distance when wearing a lens 100 / (refractive anomaly + wear lens power + adjusting power) = near-point distance when wearing

  The simple calculation table 65 is a clear view area calculation table, and senior glasses (carrier glasses) provide a clear view area. A list of frequently used ranges is displayed for awareness.

  The simple calculation table 66 is a prism calculation table. Since the number of aspherical lenses is increased, the number of cases where the prism prescription is decentered is reduced. However, it is always necessary to consider the prism action due to the deviation from the eye point. You should be conscious.

The prism calculation table 67 displays the relationship between D and H in one prism in a list, with the upper part being the frequency and the lower part being the eccentricity H (cm). Multiplying the upper frequency and the lower eccentricity gives 1 prism. Using this, it is possible to calculate not only for each frequency but also for the prism frequency.
Plentes formula P = HD
Example 1> When 1/10
0.25D → H = 0.04 (cm)
0.75D → H = 0.013 (cm)
Example 2> In the case of P4Δ, the lower row is quadrupled.
2.50D → H = 1.6 (cm)
5.00D → H = 0.8 (cm)

  The simple calculation table 67 is a displacement amount calculation table by the prism, and the amount of displacement of the object changes depending on the distance due to the prism action, but when using an aspherical design, the line-of-sight passage position on the lens at a certain distance from the eye. By taking into account, an ideal aspheric effect can be expected.

The simplified calculation table 67 displays the amount of image shift when the upper row is the distance from the prism and the lower row is P ₁ Δ. Using this, the amount of image movement due to the prism power and the distance to the target is displayed. Is calculated. In addition, the amount of change in the passing position of the line of sight on the lens can be calculated.
P ₁ Δ: 1 cm away at a distance of 1 m (1000 mm: 10 mm)
Example 1> When the distance from the center of rotation to the lens is 25 mm, it can be seen that 1P: 0.25 mm and 4 prisms cause a displacement of 1 mm on the lens.

  As described above, according to the spectacle measuring instrument 1 according to the present invention, it is possible to easily measure necessary items when the selected lens is more ideally fitted to the wearer's face, and the multipurpose type. A measuring tool can be provided. Precise measurement is performed by dedicated measuring devices such as PD meters, curve meters, and wall thickness gauges, so it is not a substitute for it. It is a very useful measuring instrument.

  The spectacle measuring instrument 1 according to the present invention is commonly used for various spectacle frames having different frame shapes and materials, such as plastic frames, metal frames, blow line frames, two-point frames, and nylon wire frames. It is what is done.

  Moreover, the spectacles measuring instrument 1 according to the present invention can measure the measuring part displayed on the transparent portion 3a by inverting the plate 2 back and forth.

It is a front view which shows one Embodiment of the measurement tool for spectacles which concerns on this invention. It is a rear view of the principal part of the measuring tool for spectacles. It is a figure for demonstrating the measurement of the curvature angle of an eyeglass lens. It is a figure for demonstrating the measurement of the curvature angle of an eyeglass lens. It is a figure for demonstrating the measurement of FPD. It is a figure for demonstrating the measurement of NPD. It is a figure for demonstrating the measurement of the distance between vertices. It is a figure for demonstrating the other measuring method of the distance between vertexes. It is a figure for demonstrating the other measuring method of the distance between vertices. It is a figure for demonstrating the measurement of the inclination angle (forward inclination angle) of a lens. It is a figure for demonstrating the measurement of the convex curve of a lens. It is a figure for demonstrating the measurement of a lens diameter. It is a figure for demonstrating the measurement of downward rotation amount. It is a figure for demonstrating the measurement of eyepoint height. It is a figure for demonstrating the measurement of eyepoint height. It is a figure which shows the measurement part J for visual acuity determination. It is a figure for demonstrating the measurement of the near point distance by a near point parameter | index.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Measuring instrument for spectacles, 2 ... Plate, 2A ... Plate main body, 2B ... Expanding part, 3a ... Transparent part, 3b ... Opaque part, 5L, 5R Interpupillary distance measurement window, 8 ... Horizontal reference line for PD, 14a ˜14d: concave curved surface portion, 20: horizontal reference line for warp angle measurement, 21L: warp angle display scale for left lens, 21R: warp angle display scale for right lens, 26L: display scale for reading left eye far pupil horizontal position , 26R: right-eye distance pupil horizontal position reading display scale, 30L: left-eye near pupil horizontal position reading display scale, 30R: right-eye distance pupil horizontal position reading display scale, 33-35: vertex distance Measurement scale, 48a to 48e ... Lens diameter measurement curve, 42 ... Vertical reference line for tilt angle measurement, 43a to 43c ... Display scale for tilt angle measurement, 50L ... Display scale for left eye rotation measurement, 50R ... Right eye Display scale for rotation measurement, 53A 53B ... Eye point height display scale, 55a, 55b ... Pinhole, 70 ... Eyeglass frame, A ... Warpage angle measurement unit, B ... Distance between pupil distance measurement unit, C ... Near pupil distance measurement unit, D ... vertex distance measuring part, E ... inclination angle measuring part, F ... convex curve measuring part, G ... lens diameter measuring part, H ... convolution measuring part, I ... eye point height measuring part, J ... measuring part for visual acuity determination , PL, PR ... Pupil.

Claims (11)

  A plate made of a light-transmitting material, and a measuring unit for measuring the warp angle of the right and left spectacle lenses mounted on the spectacle frame is provided in the light-transmitting portion of the plate. A horizontal reference line for the left lens and a plurality of display graduations intersecting the horizontal reference line at different angles, and the left lens warp angle display scale and the right lens warp angle display scale are displayed symmetrically. And a numerical value indicating an inclination angle with respect to the horizontal reference line is displayed on each display scale. The measuring instrument for eyeglasses according to claim 1,
The plate is provided with a measuring unit for measuring the tilt angle of the spectacle lens, and the tilt angle measuring unit intersects the tilt angle measuring vertical reference line and the measuring vertical reference line at different angles. A measuring instrument for spectacles, comprising a plurality of display scales for measuring inclination angles, each display scale displaying a numerical value indicating an inclination angle with respect to the vertical reference line. The measuring instrument for spectacles according to claim 1 or 2,
The plate is provided with a measuring unit that measures the distance between the vertexes of the spectacle lens and the pupil, and the interapex distance measuring unit includes a display scale for measuring the distance between the apexes, and the display scale includes a numerical value indicating the distance between the apexes. A measuring instrument for spectacles characterized by being displayed. In the spectacles measuring instrument according to any one of claims 1, 2, and 3,
An interpupillary distance measuring unit for measuring the interpupillary distance is provided on the plate, and the interpupillary distance measuring unit is based on the PD horizontal reference line indicating the datum line of the frame frame and the PD horizontal reference line, respectively. The left-eye pupil horizontal position reading display scale and the right-eye pupil horizontal position reading display scale for reading the horizontal position of the left and right eye pupils. Is a measuring instrument for spectacles, characterized in that a numerical value indicating half the distance between the geometric center points of the left and right frame frames is displayed. The measuring instrument for spectacles according to claim 4,
The interpupillary distance measurement unit includes a distance pupil distance measurement unit that measures the distance between the distance pupils and a near pupil distance measurement unit that measures the distance between the near pupils. Measuring tool. In the measuring tool for spectacles as described in any one of Claims 1-5,
An extended portion is integrally provided at the edge of the plate, and a measuring portion for measuring the convex curve of the spectacle lens is provided at the end of the extended portion, and the convex curve measuring portion is provided on the convex curve of various spectacle lenses. A measuring instrument for spectacles, comprising a plurality of concave curved surface portions formed correspondingly, wherein each concave curved surface portion displays a numerical value indicating a convex curved surface. In the spectacles measuring instrument according to any one of claims 1 to 6,
The plate is provided with a measurement unit for measuring the lens diameter, and the lens diameter measurement unit includes a plurality of lens diameter measurement curves displayed concentrically corresponding to various lens diameters. Is a measuring instrument for spectacles, wherein a numerical value indicating the corresponding lens diameter is displayed. In the measuring instrument for spectacles as described in any one of Claims 1-7,
The plate is provided with a measurement unit for measuring the amount of downward rotation of the left and right eyes. The rotation measurement unit reads a left-eye rotation measurement display scale for reading the downward rotation amount of the left eye and a downward rotation amount of the right eye. A measuring instrument for spectacles, comprising a display scale for right eye rotation measurement, wherein each display scale displays a numerical value indicating a downward rotation amount. In the spectacles measuring instrument according to any one of claims 1 to 8,
The plate is provided with a measuring unit for measuring the eye point height, and the eye point height measuring unit is provided with an eye point height measuring display scale for reading the eye point height. The display scale has an eye point. A measuring instrument for spectacles, wherein a numerical value indicating the height is displayed. In the measuring tool for spectacles as described in any one of Claims 1-9,
A measuring instrument for spectacles, characterized in that a measuring unit for visual acuity determination is provided on the plate. The measuring instrument for spectacles according to claim 10,
The eyeglass determination measuring device includes a plurality of pinholes having different hole diameters.

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