Lens frames for eye examinations, methods for measuring visual values, and methods for designing eyeglass lenses.

Abstract

To provide a lens frame for optometry which can easily perform optometry in an appropriate state even in a state which is not a horizontal view state, such as a downward view.SOLUTION: A lens frame 1 includes: a lens holding member 20 with a pair of lens frames 220 for holding a lens; and a pair of temple members 10. The temple members 10 each include: a front temple part 32 for supporting the lens holding member 20; a back template part 34 connected to the back of the front template part 32; and an angle adjustable connection unit 36 for adjusting the angle of the front temple part 32 to the back temple part 34 on the basis of the center part of rotation. The front temple part 32 has a length adjusting mechanism 324 for adjusting the length of the front temple part 32.SELECTED DRAWING: Figure 2

Description

Technical Field

[0006] , , ,

[0005] , , , ,

[0001] The present disclosure relates to an ophthalmic lens frame, a method for measuring numerical values related to vision, and an ophthalmic lens design method.

Background Art

[0002] Generally, in order to create a prescription required for making glasses, a method is used in which a subject visually inspects the refractive power while wearing an ophthalmic lens frame. The ophthalmic lens frame has a lens holding frame, and a plurality of ophthalmic lenses with different characteristics are sequentially attached to this lens holding frame to determine an appropriate glasses prescription for the subject.

[0003] As such an ophthalmic lens frame, for example, Patent Document 1 discloses a lens frame including a pair of lens holding devices and temples attached to each lens holding device, and a rotating means for adjusting the inclination of the temple end is provided between the lens holding device and the temple end.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, when performing ophthalmoscopy using an ophthalmic lens frame, as shown in FIG. 12A, when measuring visual acuity in a state where an index T is viewed through an ophthalmic lens L in horizontal vision (a state of looking in the horizontal direction), the line of sight S passes through the optical center of the lens parallel to the optical axis of the ophthalmic lens L, so that the visual acuity can be accurately measured.

[0006] However, as shown in Figure 12B, visual acuity may not be accurately measured when the subject looks at the target T through the ophthalmic lens L while looking downwards (looking downwards relative to the horizontal direction). This is because when looking downwards, the line of sight S does not pass through the optical center of the ophthalmic lens L, causing axial misalignment, which can lead to blurring due to aberrations and power errors in the ophthalmic lens L, changes in the distance between the ophthalmic lens L and the corneal apex between horizontal and downward gaze, and the addition of unintended prism. Although such a use of the line of sight is rarely instructed during eye examinations, such downward gaze is routinely required, especially for users of progressive lenses when viewing near objects. Therefore, although there is a potential need to accurately measure refractive power in such a downward gaze state, it has been difficult to accurately measure refractive power using conventional ophthalmic lens frames.

[0007] This disclosure has been made in view of the above-mentioned problems, and its purpose is to provide a lens frame for optometry that can perform optometry in an appropriate manner even in conditions other than horizontal gaze, such as downward gaze. In this specification, optometry refers to a method for measuring numerical values ​​related to vision, and refers to a series of operations in which the subject visually perceives a target and determines refractive values, prism values, etc., based on their subjective response. [Means for solving the problem]

[0008] According to this disclosure, a lens frame for optometry is provided, comprising a lens holding member having a pair of lens holding portions, each holding a lens, and a pair of temples, wherein each temple comprises a front temple portion supporting the lens holding member, a rear temple portion connected to the rear of the front temple portion, and an angle adjustment mechanism that can adjust the angle of the front temple portion relative to the rear temple portion about a pivot point, and the front temple portion has a length adjustment mechanism for adjusting the length of the front temple portion. [Effects of the Invention]

[0009] According to the present invention, a lens frame for eye examination is provided that allows for appropriate eye examination even in states other than horizontal gaze, such as downward gaze. [Brief explanation of the drawing]

[0010] [Figure 1A] This figure shows the state of eye examination in horizontal vision, as proposed by the inventors for measuring numerical values ​​related to vision. [Figure 1B] This figure shows the state of performing an eye examination while looking downwards, as proposed by the inventors for measuring numerical values ​​related to vision. [Figure 2] This is a perspective view showing a lens frame according to one embodiment of the present invention. [Figure 3] This is a front view showing a lens frame according to one embodiment of the present invention. [Figure 4] This is a side view showing a lens frame according to one embodiment of the present invention. [Figure 5] This is a front view showing a progressive refractive power lens manufactured by a method for measuring and designing numerical values ​​related to vision according to one embodiment of the present invention. [Figure 6] This is a front view showing a progressive refractive power lens manufactured by the method for measuring and designing numerical values ​​related to vision according to this embodiment. [Figure 7] This flowchart shows the flow of a method for measuring visual values ​​using a lens frame according to one embodiment of the present invention, and a method for designing eyeglass lenses based on the measurement results. [Figure 8] This figure shows an example of image data captured by an imaging device. [Figure 9] This is a side view showing a lens frame according to one embodiment of the present invention being worn by a subject. [Figure 10] This diagram shows how to adjust the lens frame so that the pivot point of the angle-adjustable connector coincides with the rotation center point. [Figure 11] This diagram shows how the front temple section rotates downwards using an angle-adjustable connector. [Figure 12A]This is a diagram showing the state of measuring visual acuity while looking at an indicator through an ophthalmic lens in horizontal view in the prior art. [Figure 12B] This is a diagram showing the state of measuring visual acuity while looking at an indicator through an ophthalmic lens in downward view in the prior art.

Embodiments for Carrying Out the Invention

[0011] In view of the above problems, as a result of intensive studies, the inventors considered that accurate ophthalmoscopy can be performed by the following procedure. FIG. 1A and FIG. 1B are diagrams showing the states of performing ophthalmoscopy in horizontal view and downward view, respectively, in the method for measuring numerical values related to vision proposed by the inventors. The eyeball E can be regarded as a substantially spherical body. When shifting from horizontal view to downward view, the eyeball E rotates so that the line of sight is directed downward. At this time, it can be considered that the eyeball E rotates about the center of rotation point O, which is the center point of the spherical body in the state where the eyeball E is regarded as a spherical body.

[0012] This center of rotation point O is located on or near the horizontal line passing through the center of the circle when the cross-sectional shape of the eyeball surface is approximated by an arc. When there is no significant ptosis of the eyelid due to aging or the like, it may be regarded as being located on or near the horizontal line passing through the point that bisects the palpebral fissure height (palpebral aperture height) vertically in horizontal view. The palpebral fissure height is the vertical distance from the lower eyelid margin LE to the upper eyelid margin UE.

[0013] As shown in FIG. 1A, when performing ophthalmoscopy in horizontal view, the line of sight coincides with the optical axis XL of the ophthalmic lens, and further, the line of sight passes through the optical axis XL of the ophthalmic lens and the reference point CL on the back surface of the lens, and the ophthalmic lens is held in a state where the distance from the reference point CL to the corneal apex is a predetermined distance VC.

[0014] Then, as shown in FIG. 1B, when performing ophthalmoscopy in a downward view, the subject directs the line of sight S downward at a predetermined angle with respect to the horizontal direction. At this time, the ophthalmoscope lens L is rotated about the rotation center point O by the same angle as the rotation angle of the eyeball E while maintaining the distance r between the reference point CL on the back surface of the ophthalmoscope lens and the rotation center point O. This distance r can be calculated as the sum of the value of the distance VC from the reference point CL on the back surface of the ophthalmoscope lens to the apex of the cornea C of the subject's eyeball E and the distance CR from the apex of the cornea C to the rotation center point O of the eyeball E. Thereby, the distance from the reference point CL on the back surface of the ophthalmoscope lens L to the apex of the cornea C becomes equal to the distance VC in the horizontal view. Also, the line of sight S coincides with the optical axis XL of the ophthalmoscope lens L.

[0015] By performing ophthalmoscopy in this downward view, the line of sight S does not deviate from the optical center axis of the ophthalmoscope lens L, and blurring or prisms due to aberration do not occur, enabling highly accurate ophthalmoscopy.

[0016] Hereinafter, an ophthalmoscope lens frame according to an embodiment of the present invention will be described with reference to the drawings. The lens frame of the present embodiment is for realizing the method for measuring numerical values related to vision conceived by the above-mentioned inventors. FIGS. 2 to 4 show a lens frame according to an embodiment of the present invention, FIG. 2 is a perspective view, FIG. 3 is a front view, and FIG. 4 is a side view. As shown in FIGS. 2 to 4, the lens frame 1 of the present embodiment includes a frame body 10 and a lens holding member 20.

[0017] The frame body 10 has a pair of temple members 30 and a nose rest frame 40. Each temple member 30 includes a front temple portion 32, a rear temple portion 34, and an angle-adjustable connection portion 36 that rotatably connects the front temple portion 32 to the rear temple portion 34.

[0018] The rear temple portion 34 has a shape in which the front part extends linearly in the front-rear direction and the rear end curves downward. The rear temple portion 34 includes a first rear temple material 340 located at the front and a second rear temple material 342 located at the rear.

[0019] The first rear temple material 340 has a hollow rectangular cross-section and extends in a straight line. The second rear temple material 342 has a hollow rectangular cross-section and has a curved portion 342A formed at its rear end that curves downward. This curved portion 342A of the second rear temple material 342 functions as an earpiece when the subject wears the lens frame 1.

[0020] The width and height of the inner surface of the cross-section of the second rear temple material 342 are approximately equal to the width and height of the outer surface of the cross-section of the first rear temple material 340. The rear end of the first rear temple material 340 is nested within the front end of the second rear temple material 342. This nested structure allows the second rear temple material 342 to be moved in the front-rear direction relative to the first rear temple material 340. In other words, this nested structure functions as a length adjustment mechanism 344 for adjusting the length of the rear temple portion 34. Note that the configuration of the length adjustment mechanism for the rear temple portion is not limited to a nested structure; for example, a slit may be formed in one of the first or second rear temple material 340, and a projection may be formed on the second rear temple material 342, allowing this projection to slide within the slit. Any suitable configuration for adjusting and maintaining the length may be adopted. Furthermore, the cross-sectional shape of the first rear temple material 340 and the second rear temple material 342 is not limited to a rectangle; any suitable shape such as a circle can be adopted.

[0021] The front temple portion 32 has a shape that extends linearly forward. The front temple portion 32 includes a first front temple material 320 located at the front and a second front temple material 322 located at the rear.

[0022] The first front temple material 320 has a hollow rectangular cross-section and extends in a straight line. The second front temple material 322 has a hollow rectangular cross-section and extends in a straight line. The width and height of the inner surface of the cross-section of the second front temple material 322 are approximately equal to the width and height of the outer surface of the cross-section of the second front temple material 322. The rear end of the first front temple material 320 is nested inside the front end of the second front temple material 322. This nesting structure allows the second front temple material 322 to be moved in the front-to-back direction relative to the first front temple material 320. In other words, this nesting structure functions as a length adjustment mechanism 324 for adjusting the length of the front temple portion 32. The configuration of the length adjustment mechanism 324 for the front temple portion 32 can be appropriately configured, similar to the configuration of the length adjustment mechanism 344 for the rear temple portion 34. The cross-sectional shapes of the first front temple material 320 and the second front temple material 322 are not limited to rectangles; they can be circular or other appropriate shapes.

[0023] The angle-adjustable connector 36 rotatably connects the front temple portion 32 and the nose rest frame 40 to the rear temple portion 34. That is, a pivot point is located in the center of the angle-adjustable connector 36, from which the front temple portion 32 and the nose rest frame 40 rotate relative to the rear temple portion 34. The angle-adjustable connector 36 allows the front temple portion 32 and the nose rest frame 40 to rotate relative to the rear temple portion 34 within a plane defined in the vertical and horizontal directions, and can also maintain the respective angles of the front temple portion 32 and the nose rest frame 40 relative to the rear temple portion 34 at a desired angle. A ratchet mechanism or the like can be used as the mechanism for such an angle-adjustable connector 36. The mechanism for the angle-adjustable connector 36 is not limited to a configuration that allows for stepwise angle changes, such as a ratchet mechanism, but may also be a configuration that allows for continuous angle changes.

[0024] The front temple portion 32 can be rotated from a state parallel to the rear temple portion 34 to a state in which the front is tilted upward and downward, respectively. The rotational angle range of the front temple portion 32 is preferably 60 degrees in each of the vertical directions, and more preferably 30 degrees in each of the vertical directions.

[0025] The nose rest frame 40 includes a pair of first frame members 400 extending forward in a horizontal view from each angle-adjustable connection part 36, a pair of second bent frame members 402 connected in front of each first frame member 400, and a third horizontal frame member 404 stretched between the pair of second bent frame members.

[0026] The first frame member 400 has its rear end connected to an angle-adjustable connector 36. The first frame member 400 has a hollow rectangular cross-section and extends in a straight line. The second bent frame member 402 has a hollow rectangular cross-section and is bent perpendicularly between its base and tip. The width and height of the inner surface of the cross-section of the second bent frame member 402 are approximately equal to the width and height of the outer surface of the cross-section of the first frame member 400. The front end of the first frame member 400 is nested inside the rear end of the second bent frame member 402. This nested structure allows the second bent frame member 402 to be moved in the front-rear direction relative to the first frame member 400. In other words, this nested structure functions as a length adjustment mechanism 410 for adjusting and maintaining the front-rear length of the nose rest frame 40.

[0027] The third horizontal frame member 404 has a hollow rectangular cross-section and extends linearly in the lateral direction. The width and height of the outer surface of the cross-section of the third horizontal frame member 404 are approximately equal to the width and height of the inner surface of the cross-section of the second bent frame member 402. Both ends of the third horizontal frame member 404 are nested within the ends of the second bent frame member 402. This nested structure allows the second bent frame member 402 to be moved laterally relative to the third horizontal frame member 404, that is, the lateral width of the nose rest frame 40 can be freely changed. In other words, this nested structure functions as a width adjustment mechanism 420 for adjusting the lateral width of the nose rest frame 40.

[0028] A pair of nose rest support parts 430 are attached symmetrically to the left and right center of the nose rest frame 40. The nose rest support parts 430 are attached so as to extend downward from the center of the nose rest frame 40, and a nose pad 32 is attached to the tip. When the lens frame 1 is attached, the nose rests 432 of the nose pad support parts 430 are positioned to contact both sides of the subject's nose. The nose rest support parts 430 may be made of an elastic material such as rubber, or of a deformable resin.

[0029] The lens holding member 20 comprises a bridge member stretched between the front temple portions 32, connecting portions 230 that connect both ends of the bridge member 200 to the front ends of the front temple portions 32, and a pair of lens frames 220 attached to the bridge member 200.

[0030] The bridge member 200 includes a pair of first bending members 202 and a second transverse member 204 provided between the first bending members 202. The first bending member 202 has a vertical portion 202A whose upper end is connected to the front end of the front temple portion 32 via a connecting portion 230 and extends from there, and a horizontal portion 202B that bends perpendicularly from the vertical portion 202A and extends inward in the lateral direction. The first bending member 202 has a hollow rectangular cross-section.

[0031] The second transverse member 204 has a hollow rectangular cross-section and extends linearly in the transverse direction. The width and height of the outer surface of the cross-section of the second transverse member 204 are approximately equal to the width and height of the inner surface of the cross-section of the first bending member 202. Both ends of the second transverse member 204 are nested within the tips of the first bending member 202. This nested structure allows the first bending member 202 to be moved laterally relative to the second transverse member 204, that is, the lateral width of the bridge member 200 can be freely changed. In other words, this nested structure functions as a width adjustment mechanism 210 for adjusting and maintaining the lateral width of the bridge member 200.

[0032] The connecting portion 230 connects the front end of the front temple portion 32 to the upper end of the vertical portion 202A of the first bending member 202 of the bridge member 200. The connecting portion 230 can be set to any height according to the length of the vertical portion 202A of the first bending member 202 of the bridge member 200, but in this embodiment, it is located at the same height as the center of the ophthalmic lens mounted in the lens frame 220. This makes it possible to more smoothly change the length of the front temple portion 32 to a predetermined length using the length adjustment mechanism 324, which will be described later.

[0033] Each lens frame 220 comprises a lens frame body 222 and a column portion 224 that supports the lens frame body 222. The lens frame body 222 is an arc-shaped member with rigidity capable of holding an ophthalmoscopic lens, and its upper surface has grooves formed for mounting up to three ophthalmoscopic lenses, such as trial lenses and ophthalmoscopic lenses.

[0034] The columnar portion 224 is cylindrical and extends downward from the lower end of the lens frame 220. The lens frame 220 is attached to the upper surface of the lateral portion 202B of the first bending member 202 of the bridge member 200. The bridge member 200 incorporates a lens spacing adjustment mechanism 212 that allows the lens frame 220 to move laterally along the lateral portion 202B, and a curvature adjustment mechanism 214 that allows the lens frame 220 to rotate around the central axis of the column portion 224.

[0035] The lens spacing adjustment mechanism 212 and the curvature adjustment mechanism 214 can be configured such that, for example, a slit is formed in the lateral portion 202B and the base of the column portion 224 is inserted into the slit in a rotatable manner. By rotating the dial members 212 and 214, the spacing of the lens frame 220 (spacing of the ophthalmic lenses) and the angle of the lens frame 220 (angle of the ophthalmic lenses) can be changed.

[0036] Furthermore, it is desirable that the lateral movement of the lens frame 220 by the lens spacing adjustment mechanism 212 be configured such that the pair of lens frames 220 move symmetrically from left to right. As an example of such a configuration, a screw rod with symmetrically formed screw grooves is placed inside the first bending member 202 and the second lateral member, and a nut that screws onto this screw rod is attached to the lower end of the column portion 224, and the screw rod is rotated.

[0037] The following describes a method for measuring visual values ​​using the lens frame 1 described above, and a method for designing eyeglass lenses based on the measurement results. The following description concerns the procedure for performing eye examinations to manufacture progressive power lenses. Figure 5 is a front view showing a progressive power lens manufactured by the method for measuring and designing visual values ​​according to this embodiment. As shown in Figure 5, the progressive power lens 500 comprises a near-vision section 520 located at the bottom for viewing near distances, a far-vision section 510 located from the top to the center for viewing distances greater than near distances, and an intermediate section 530 located between the near-vision section 520 and the far-vision section 510, which has a progressive refractive function in which the lens power changes continuously.

[0038] Furthermore, the method for measuring numerical values ​​related to vision in this embodiment is performed using the frame position adjustment system 50 shown in Figure 6. As shown in Figure 6, the frame position adjustment system 50 comprises a processing unit 52, a pair of imaging devices 54 connected to the processing unit 52 in a communicative manner, a display 56 connected to the processing unit 52 in a communicative manner, and an input device 58 connected to the processing unit 52 in a communicative manner.

[0039] The pair of imaging devices 54 are positioned on either side of the subject's head, flanking it. Each imaging device 54 is, for example, a digital camera, and it captures images of the area around the subject's eyes from the side. The image data captured by the imaging devices 54 is sequentially sent to the processing unit 52.

[0040] The processing unit 52 is a device equipped with a CPU, memory, recording medium, input interface, and output interface, such as a personal computer. The processing unit 52 reads a program recorded on the recording medium into memory, and the CPU executes the program to determine the rotation center of the subject's eyeball based on the image data received from the imaging device 54, as will be described in detail later. The processing unit 52 then outputs image data, in which the position of the rotation center is superimposed on the image captured by the imaging device 54, to the display 56.

[0041] The display 56 displays the image data received from the processing unit 52. The input device 58 is, for example, a keyboard or a touch panel, and accepts input of CR and VC determined as described later.

[0042] Figure 7 is a flowchart showing the flow of a method for measuring visual values ​​using a lens frame according to this embodiment and a method for designing eyeglass lenses based on the measurement results. As shown in Figure 7, first, the distance CR from the corneal apex to the rotation center point of the subject is determined (S10). As a method for determining CR, known methods such as the method disclosed in Japanese Patent Application Publication No. 2011-39552 can be employed. That is, methods such as using an eye rotation point measuring device or calculating from the intersection of lines of sight in different directions can be employed.

[0043] Furthermore, a simple and practical method is to use a commonly available axial length measuring device. Specifically, this method involves measuring the axial length and calculating the ocular rotation point from the measured axial length. In this method, a relative position coefficient of the distance from the corneal apex to the rotation center point is calculated in advance using general statistical data on the relative position of the ocular rotation point to the measured axial length. For example, if the average data shows an axial length of 24 mm and a CR (radius from the corneal apex to the rotation center point) of 13 mm, then 13 / 24 = 0.54 would be the relative position coefficient used in the calculation. Therefore, if the axial length measuring device detects a subject's axial length as 27 mm, this relative position coefficient of 0.54 is used to set the subject's CR value to 27 mm × 0.54 = 14.6 mm. Alternatively, the correlation between axial length and CR can be identified by various other methods, and the distance CR (radius from the corneal apex to the rotation center point) can be set based on this relative relationship and the measured axial length.

[0044] Alternatively, the average value of the Critical Risk (CR) can be recorded in advance and used as the CR value. For example, the average CR data can be recorded for each category such as age and height, and the average CR value can be obtained from this data based on the age and height of each subject, and that value can be used as the subject's CR value.

[0045] Next, the distance VC from a reference point on the back surface of the spectacle lens to the corneal apex of the spectacle wearer's eyeball is determined (S12). This distance VC is also called the corneal apex distance (CVD). As a method for calculating this distance VC, for example, the methods described in Japanese Patent Application Publication No. 2016-167038 and International Patent Application Publication No. 2014-133166 can be used.

[0046] The optometrist then inputs the CR and VC determined in this manner into the input device 58 of the frame position adjustment system 50 (S14). The data regarding the CR and VC received by the input device 58 is sent to the processing device 52. Note that the step of determining these CR and VC may also be performed using the frame position adjustment system 50 and based on image data acquired by the imaging device 54. In this case, it is preferable to also provide an imaging device in front of the subject.

[0047] Next, the subject is asked to sit with a pair of imaging devices 54 positioned on either side of their face and to look horizontally, and the frame position adjustment system 50 is activated. When the frame position adjustment system 50 is activated, the processing unit 52 acquires image data captured by the imaging devices 54 (S16). Figure 8 is a diagram showing an example of image data captured by the imaging devices. When the processing unit 52 of the frame position adjustment system 50 detects the side of the subject's face in the image data captured by the imaging devices 54, it determines the rotation center point O in the image data (S18). Specifically, first, as shown in Figure 8, the margin of the upper eyelid UE, the margin of the lower eyelid LE, and the area of ​​the eyeball surface C are determined by image processing. Then, the horizontal line HL that bisects the subject's palpebral fissure height, that is, the horizontal line passing through the midpoint between the vertex of the upper eyelid margin UE and the lower point of the lower eyelid margin LE, is determined by image processing. Then, the point located a distance CR posterior to the apex of the cornea C on this horizontal line HL is determined as the subject's rotation center point O. Note that this horizontal line HL is not limited to a horizontal line bisecting the palpebral fissure height; accuracy can be improved by using a horizontal line passing through the center of a circle when the surface shape of the eyeball in the image data is considered as an arc.

[0048] Next, the lens frame 1 is fitted to the subject (S20). Figure 9 is a side view showing the lens frame according to this embodiment fitted to the subject. As shown in Figure 9, the lens frame 1 can be fitted to subject P by bringing the nose rest 432 of the nose rest support 430 into contact with both sides of subject P's nose N, and by placing the curved portions 342A of the pair of rear temples 34 on subject P's ears EA. At this time, the width of the pair of temple members 30 is changed to match the width of subject P's face. The width of the pair of temple members 30 can be changed by adjusting the width of the bridge member 200 with the width adjustment mechanism 210 and by adjusting the width of the nose rest frame 40 with the length adjustment mechanism 410. In addition, the lens spacing adjustment mechanism 212 moves the lens frame 220 laterally so that the reference point of the lens frame 220 coincides with the center of the subject's pupil, according to the subject's interpupillary distance PD.

[0049] Next, as shown in Figure 10, the lens frame 1 is adjusted so that the pivot point of the angle-adjustable connector 36 coincides with the pivot point O in the image data (S22). Specifically, the length of the rear temple portion 34 is adjusted by the length adjustment mechanism 344, the length of the nose rest frame 40 is adjusted by the length adjustment mechanism 410, and the angle of the nose rest frame 40 relative to the rear temple portion 34 is adjusted. This allows the position of the angle-adjustable connector 36 of the lens frame to be moved in the vertical plane in the front-to-back direction. Then, while referring to the display 56, the pivot axis of the angle-adjustable connector 36 can be moved to coincide with the pivot point O.

[0050] Furthermore, this adjustment process can be reduced to mere fine-tuning by pre-adjusting the length of the rear temple section 34, the length of the nose rest frame 40, and the angle of the nose rest frame 40 relative to the rear temple section 34 before attaching the lens frame 1.

[0051] In this way, by performing steps S20 and S22, the lens frame 1 can be attached to the face of subject P such that the pivot point of the angle-adjustable connecting portion 36 of the lens frame 1 is located to the side of the pivot point O of subject P.

[0052] Next, the ophthalmic lenses L are attached to the lens frame 220. Up to three ophthalmic lenses L can be attached to the lens frame 220. Spherical power lenses, cylindrical power lenses, and prism lenses are used in appropriate combinations as ophthalmic lenses. The horizontal line HL is then aligned with the optical axis XL of the ophthalmic lens L, and the position of the ophthalmic lens L is adjusted so that the distance from the reference point CL on the back surface of the ophthalmic lens L to the corneal apex is VC (S24). As a result, the distance from the reference point CL on the back surface of the ophthalmic lens to the rotation center point O becomes r = VC + CR. The position of the ophthalmic lens L can be adjusted by rotating the front temple portion 32 around the angle-adjustable connection portion 36 relative to the rear temple portion 34, and adjusting the length of the front temple portion 32 using the length adjustment mechanism 324.

[0053] Next, optometric data in horizontal vision is measured (S26). Specifically, a target T is presented at a viewing distance where the subject requires eyeglasses, for example, about 2m in front of them, and the subject is instructed to view the target T in horizontal vision through the optometric lens. Then, based on the subject's response, the optometric lens is changed, and optometric data in horizontal vision is measured while checking visual acuity or wearing comfort.

[0054] Next, as shown in Figure 11, the front temple portion 32 is rotated downward by a specified angle, for example, 15 degrees, using the angle-adjustable connector portion 36 (S28). At this time, the lens frame 220 may also be rotated to a predetermined curvature angle. Then, optometric data for downward viewing is measured (S30). Specifically, the visual target T is presented at a height located approximately 2m in front of the subject and 15 degrees downward. The subject is then instructed to look at the target T through the optometric lens while keeping their head still. Based on the subject's response, the optometric lens is changed to check visual acuity or wearing comfort, and optometric data for downward viewing is measured.

[0055] In this case, by rotating the front temple portion 32 downward by a predetermined angle around the angle-adjustable connecting portion 36, which coincides with the rotation center point O, the relative position between the ophthalmic lens L and the subject's pupil can be kept the same as in the case of horizontal viewing. That is, the subject's line of sight S coincides with the optical axis XL of the ophthalmic lens L, and the distance from the reference point CL on the back surface of the ophthalmic lens L to the corneal apex becomes VC.

[0056] Furthermore, when measuring optometric data in downward or horizontal gaze, the subject may be instructed to look at a target at a specified angle in a natural posture while allowing head movement. The rotation angle of the subject's head at that time can be measured by processing image data, and the front temple portion 32 may be rotated downward by the angle-adjustable connector portion 36 by the difference between the specified angle and the head rotation angle. Even in such cases, the subject's line of sight S coincides with the optical axis XL of the ophthalmic lens L, and the distance from the reference point CL on the back surface of the ophthalmic lens L to the corneal apex is VC. The rotation angle of the subject's head can also be determined using a frontal or lateral image of the subject or a measuring device such as a gyro sensor.

[0057] The eye examination is completed through the above steps.

[0058] Note that the steps for measuring optometric data in downward gaze and measuring optometric data in horizontal gaze may be performed in reverse order.

[0059] Then, based on the eye examination data in horizontal vision, the eye examination data in downward vision, and the difference in the angle of the front temple portion during the horizontal and downward vision eye examinations, the spectacle lens is designed (S32). Specifically, based on the eye examination data and angles, design information for the spectacle lens is determined, including at least the spherical power, cylindrical power, astigmatism axis direction at the viewing distance for which the subject requires the spectacle lens, as well as the prism amount and prism base direction. The design of the eyeglass lens is completed through the above steps.

[0060] Based on the lens design information determined in this way, the lens blank can be cut, polished, etc., to manufacture a lens that accurately reflects the amount of prism required when looking downwards.

[0061] Furthermore, in the steps of measuring eye examination data in horizontal vision (S26) and downward vision (S30), the distance to the target presented to the subject can be set to, for example, approximately 5m and 40cm, respectively, and by measuring eye examination data for both far and near vision, progressive power lenses can also be designed.

[0062] In this case, when measuring eye examination data for near vision, the subject may be instructed to look at a book or newspaper held in their hand in a natural posture, and the examiner may observe the position of the subject's pupil from the front of the lens frame 1 and adjust the angle of the front temple portion 32 so that it is positioned in the center of the eye examination lens.

[0063] Then, based on the eye examination data for distance vision, the eye examination data for near vision, and the difference in the angle of the front temple portion during the eye examination for distance vision and near vision, a progressive power lens is designed (S32). Specifically, based on the eye examination data and angles, design information for the progressive power lens is determined, including at least the distance power (SPH: spherical power, CYL: cylindrical power, AX: astigmatism axis direction) for distance vision, the add power (ADD: add power), and the progressive zone length. The design of the progressive power lens is completed through the above steps.

[0064] Based on the progressive design information determined in this way, the lens blank can be cut, polished, etc., to manufacture a progressive refractive power lens.

[0065] According to this embodiment, the following effects are achieved. According to the lens frame 1 of this embodiment, the temple member 30 comprises a front temple portion 32 that supports the lens holding member 20, a rear temple portion 34 connected to the rear of the front temple portion 32, and an angle-adjustable connecting portion 36 that allows adjustment of the angle of the front temple portion 32 relative to the rear temple portion 34 around the pivot center. The front temple portion 32 has a length adjustment mechanism 324 that allows adjustment of the length of the front temple portion 32. As a result, by mounting the frame so that the pivot center coincides with the rotation center point O, and adjusting the length of the front temple portion 32 using the length adjustment mechanism 324 in horizontal viewing, the distance between the apex of the cornea C and the ophthalmoscopic lens L can be set to a predetermined distance VC, allowing for eye examination in horizontal viewing. Furthermore, by rotating the frame downward around the pivot center using the angle-adjustable connecting portion 36, eye examination in downward viewing can be performed while maintaining the distance between the apex of the cornea C and the ophthalmoscopic lens L at a predetermined distance VC.

[0066] Furthermore, according to this embodiment, the rear temple portion 34 has a length adjustment mechanism 344 that allows the length of the rear temple portion 34 to be adjusted. This makes it possible to adjust the length of the rear temple portion 34 and easily change the position of the pivot point.

[0067] Furthermore, according to this embodiment, the lens frame 1 has a lens spacing adjustment mechanism that adjusts the distance between a pair of lens frames 220. This allows the reference point of the ophthalmoscopic lens L held in the lens frame 220 to be adjusted to a desired position according to the interpupillary distance PD of the subject.

[0068] Furthermore, according to this embodiment, the lens frame 1 is equipped with a curvature adjustment mechanism for adjusting the curvature of the ophthalmic lens L held by a pair of lens frames 220. This allows eye examinations to be performed with the curvature of the ophthalmic lens L held by the lens frames 220 adjusted to match the lens frame.

[0069] Furthermore, according to this embodiment, a nose rest 432 is provided, which is connected to the temple member 30 and configured to be adjustable in position relative to the pivot center. With this configuration, the nose rest 432 and the temple member 30 make it possible to adjust the position of the pivot center while the lens frame 1 is attached to the subject's face.

[0070] According to the lens frame 1 of this embodiment, the frame body 10 is configured to allow the ophthalmic lens L, held in the lens frame 220, to rotate around the pivot center while maintaining a predetermined distance between the pivot center and the ophthalmic lens L. The frame body 10 is also configured to allow the position of the pivot center to move in the forward, backward, up, and down directions while the frame body 10 is attached to the face of the subject.

[0071] Furthermore, according to this embodiment, the lens holding member 20 is connected to the front temple portion 32 of the frame body 10, and the length of the front temple portion 32 is adjustable. This allows the ophthalmic lens L to be held in a position where the distance from the reference point CL on the back surface of the ophthalmic lens L to the corneal apex is a predetermined distance VC.

[0072] Furthermore, according to the method for measuring numerical values ​​related to vision of this embodiment, the method includes: a mounting step (S20) in which the above-mentioned lens frame 1 is used, the lens frame 1 is attached to the face of the subject, and the rotation center is positioned to the side of the subject's rotation center point; an adjustment step (S24) in which the length of the front temple portion 32 is adjusted so that the distance between the rotation center and the reference point of the ophthalmic lens L is a predetermined length CV; a first measurement step (S26) in which a first numerical value related to the subject's vision (ophthalmic data in horizontal gaze) is measured with the ophthalmic lens L attached to the lens frame 220; and a second measurement step in which the lens frame 220 is rotated around the rotation center without changing the distance to the rotation center (S28), and then a second numerical value related to the subject's vision (ophthalmic data in downward gaze) is measured.

[0073] This allows for the measurement of optometric data for both distance and near vision, while maintaining the distance between the ophthalmic lens L and the rotational center point O of the eyeball in both horizontal and downward vision, without causing axial misalignment.

[0074] Furthermore, according to the eyeglass lens design method of this embodiment, as described above, distance vision eye examination data is measured in horizontal gaze and near vision eye examination data is measured in downward gaze. Therefore, when designing a progressive power lens 500 comprising a near-vision section 520 for viewing near distances, a far-vision section 510 for viewing distances greater than near distances, and an intermediate section 530 having a progressive refraction function provided between the near-vision section 520 and the far-vision section 510, the design can be made with high precision to match the actual wearing conditions.

[0075] In this embodiment, the rotational center of the eyeball is identified and the position of the lens frame is adjusted using the frame position adjustment system 50, but the present invention is not limited thereto. An ophthalmologist performing the eye examination may visually observe the side of the subject's face to identify the rotational center of the subject's eyeball and adjust the position of the lens frame accordingly.

[0076] Furthermore, in this embodiment, the nose rest frame 40 is rotatable around the angle-adjustable connecting portion 36 and its length is adjustable by the length adjustment mechanism 410. However, the nose rest frame 40 does not necessarily need to be rotatable or length-adjustable. For example, by making the nose rest support portion 430 a member that can support and deform the lens frame 1, the pivot point of the front temple portion 32 can be freely moved in the front-back and up-down directions. [Explanation of symbols]

[0077] 1: Lens frame 10: Frame body 20: Lens holding member 30: Temple component 32: Front temple section 34: Rear temple section 36: Angle-adjustable connector 40: Nose rest frame 50: Frame position adjustment system 52: Processing Unit 54: Imaging device 56: Display 58: Input device 200: Bridge component 202: First bending member 202A: Vertical section 202B: Lateral part 204: Second transverse member 210: Width adjustment mechanism 212: Lens spacing adjustment mechanism (dial component) 214: Curve angle adjustment mechanism (dial component) 220: Lens frame 222: Lens frame body 224: Column part 230: Connection part 320: First front temple material 322: Second front temple material 324: Length adjustment mechanism 340: First rear temple material 342: Second rear temple material 342A: Curved section 344: Length adjustment mechanism 400: First frame material 402: Second bending frame material 404: Third horizontal frame member 410: Length adjustment mechanism 420: Width adjustment mechanism 430: Nose rest support 432: Nose rest 500: Progressive refractive power lenses 510 :Distance part 520: Near vision area 530: Middle section C:Cornea CL: Optical axis center E:Eyeball EA: Ear HL: Horizontal line L: Eye examination lens LE: edge N:Nose O: Center of rotation P: Subject S: Gaze T :Indicator UE: The edge of the upper eyelid XL: Optical axis

Claims

1. An eye examination lens frame comprising a lens holding member having a pair of lens holding parts, each holding a lens for eye examination, and a pair of temples, The aforementioned temples are, The front temple portion that supports the lens holding member, The rear temple portion connected to the rear of the front temple portion, The device includes an angle adjustment mechanism that allows adjustment of the angle of the front temple portion relative to the rear temple portion within a plane defined in the vertical and front-back directions, with respect to a rotation center that coincides with the rotation center point, which is the center point of a sphere when the eyeball is considered to be a sphere. The aforementioned front temple portion has a front length adjustment mechanism that allows the length of the front temple portion to be adjusted. The rear temple portion has a rear length adjustment mechanism that allows the length of the rear temple portion to be adjusted. Lens frames for eye examinations.

2. Furthermore, it has a lens spacing adjustment mechanism that can adjust the distance between the pair of lens holding parts. A lens frame for optometry according to claim 1.

3. Furthermore, it is equipped with a warp angle adjustment mechanism that adjusts the warp angle of the lenses held in a pair of lens holders. A lens frame for ophthalmology according to claim 1 or 2.

4. Furthermore, it includes a nose rest connected to the temple and configured to be adjustable in position relative to the pivot center, A lens frame for ophthalmological examination according to any one of claims 1 to 3.

5. A lens holding member having a pair of lens holding parts, each holding a lens for eye examination, A lens frame for eye examination comprising a frame body that is attached to the face of a subject, The frame body is configured such that the lens held in the lens holder can rotate within a plane defined in the vertical and front-back directions around the pivot center, while maintaining a predetermined distance between the pivot center and the lens. The frame body is movable in the forward, backward, up, and down directions when attached to the face of the subject, such that the position of the pivot center coincides with the rotation center point, which is the center point of the sphere when the eyeball is considered to be a sphere. Lens frames for eye examinations.

6. The lens holding member is connected to the front temple portion of the frame body, The aforementioned front temple section is adjustable in length. The lens frame for optometry according to claim 5.

7. A method for measuring numerical values ​​related to vision using a lens frame according to any one of claims 1 to 6, A mounting step involves attaching the lens frame to the subject's face and positioning the pivot center to the side of the subject's pivot point, An adjustment step of adjusting the lens frame so that the distance between the pivot point and the reference point of the lens is a predetermined length, A first measurement step involves measuring a first numerical value related to the subject's visual acuity while the lens for eye examination is attached to the lens holder, A second measurement step involves rotating the lens holder around the pivot center without changing the distance to the pivot center, and then measuring a second numerical value related to the subject's vision. A method for measuring numerical values ​​related to vision, comprising the following features.

8. A method for designing eyeglass lenses, comprising designing eyeglass lenses based on the first and second numerical values ​​measured by the method described in Claim 7.

9. The aforementioned eyeglass lens is A progressive refractive power lens comprising a near-vision section for viewing near distances, a far-vision section for viewing distances greater than the near-vision section, and an intermediate section having a progressive refractive function provided between the near-vision section and the far-vision section. In one of the first and second measurement steps, a first numerical value relating to vision in distance vision is measured. In the other of the first and second measurement steps, a second numerical value relating to visual acuity in near vision is measured. Based on the first and second values, at least the distance power, add power, and progressive zone length to be applied to the spectacle lens are determined. The method for designing eyeglass lenses according to claim 8.

Images