Ophthalmic device

Abstract

The present invention provides an ophthalmic apparatus comprising: a measurement optical system that acquires information on an eye to be examined of a subject; an imaging unit that acquires an anterior eye image on the optical axis of the measurement optical system of the eye to be examined; a display unit that displays the anterior eye image; two or more imaging units for imaging an anterior eye part of the eye to be examined from different directions; a drive mechanism that moves the measurement optical system in the vertical, horizontal, and front-rear directions; the control part is used for acquiring the position information of the to-be-inspected eye in the front-back direction and the position information of the to-be-inspected eye in the vertical and horizontal directions on the basis of the results obtained by the components; a control unit that calculates the amount of movement of the measurement optical system in the vertical and horizontal directions and the amount of movement of the measurement optical system in the front-back direction on the basis of the position information, and that performs position alignment of the measurement optical system with respect to the eye to be examined on the basis of each amount of movement; the control unit displays an anterior eye image on the display unit when the position of the measurement optical system with respect to the eye to be examined is aligned.

Description

[0001] This application is a divisional application of invention patent application 201910520509.1, filed on June 17, 2019. Technical Field

[0002] This invention relates to an ophthalmic device. Background Technology

[0003] Known ophthalmic devices use two or more imaging units (cameras) to capture images of the anterior eye of the eye to be examined (the subject's eye) from different directions, and adjust (align) the position between the eye to be examined and the measuring optical system based on the obtained two or more images (e.g., see Patent Documents 1 and 2).

[0004] In the ophthalmic device described in Patent Document 1, two or more captured images are analyzed to determine feature points such as the pupil center. Based on the three-dimensional position (3D position) of the eye to be examined obtained from the position of these feature points and the positions of the two or more imaging units, the main body unit is moved along the XYZ directions. This allows for appropriate alignment of the measurement optical system relative to the eye to be examined.

[0005] Furthermore, Patent Document 2 discloses a method that extracts partial images from two or more images of the eye to be examined taken from different directions, and then, based on a composite image that synthesizes these partial images, uses the position deviating from the pupil center as a feature point to determine the three-dimensional position of the eye to be examined. Therefore, even when the eye to be examined is a cataract eye and the pupil center cannot be determined, the position of the measurement optical system relative to the eye to be examined can be properly aligned.

[0006] In these existing technologies, the inspector can confirm whether the positioning is automatically performed or manually performed by visually observing the captured or composite image displayed on the display unit.

[0007] In order to achieve higher accuracy in position alignment, there is an urgent need to develop a technique that can more appropriately measure the characteristics of the eye under examination and more detailedly confirm the position alignment or observe the condition of the eye under examination.

[0008] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2013-248376 Patent Document 2: Japanese Patent Application Publication No. 2014-200678 Summary of the Invention The technical problem that the invention aims to solve The present invention addresses the aforementioned problems and aims to provide an ophthalmic device capable of clearly confirming the alignment of the measuring optical system with respect to the eye under examination and the state of the eye under examination, and rapidly and accurately aligning the system to properly measure the characteristics of the eye under examination.

[0009] Technical means to solve the problem To achieve the above objectives, the ophthalmic device of the present invention comprises: a measuring optical system for acquiring information about the eye to be examined of a subject; an imaging unit for acquiring an anterior eye image on the optical axis of the measuring optical system of the eye to be examined; a display unit for displaying the anterior eye image; two or more imaging units for capturing images of the anterior eye of the eye to be examined from different directions; a drive mechanism for moving the measuring optical system along a vertical and horizontal direction; and a control unit for acquiring three-dimensional position information of the eye to be examined based on two or more images captured by the two or more imaging units, calculating the amount of movement of the measuring optical system in the vertical direction and the amount of movement in the horizontal direction based on the position information, and controlling the drive mechanism based on each amount of movement to align the measuring optical system relative to the eye to be examined, wherein the control unit displays the anterior eye image on the display unit when aligning the measuring optical system relative to the eye to be examined.

[0010] The effects of the invention With the ophthalmic device configured as described above, the positional relationship between the eye under examination and the measuring optical system can be obtained in three dimensions based on images acquired by two or more imaging units. At this time, the examiner can visually observe the anterior ocular image of the optical axis strip of the measuring optical system acquired by the imaging unit, displayed on the display unit. Therefore, the alignment of the measuring optical system relative to the eye under examination, the state of the eye under examination, can be clearly confirmed, and the alignment can be performed quickly and with high precision, allowing for appropriate measurement of the characteristics of the eye under examination. Attached Figure Description

[0011] Figure 1 This is a front view showing the appearance of the ophthalmic device related to this embodiment.

[0012] Figure 2 This is a simplified structural diagram showing the measuring unit of the ophthalmic device related to this embodiment.

[0013] Figure 3 This is a simplified structural diagram showing the measurement optical system of the ophthalmic device related to this embodiment.

[0014] Figure 4 This is a block diagram showing the control system of the ophthalmic device related to this embodiment.

[0015] Figure 5This is a detailed structural diagram showing the measuring optical system for the right eye in the ophthalmic device related to this embodiment.

[0016] Figure 6 This is a diagram schematically showing the positional relationship between the two cameras of the ophthalmic device related to this embodiment and the eye to be examined.

[0017] Figure 7 This is a flowchart illustrating a working example of an ophthalmic device related to this embodiment.

[0018] Figure 8 This diagram shows an example of an image displayed by the display unit of an ophthalmic device related to this embodiment.

[0019] Figure 9 This is another example of an image displayed by the display unit of an ophthalmic device related to this embodiment.

[0020] Figure 10 These are diagrams illustrating different examples of images displayed by the display unit of an ophthalmic device related to this embodiment.

[0021] Figure 11 This is a diagram showing yet another different example of an image displayed by the display unit of the ophthalmic device related to this embodiment. Detailed Implementation

[0022] Hereinafter, embodiments of the ophthalmic device for implementing the present invention will be described. First, the overall structure of the ophthalmic device 10 related to this embodiment will be shown with reference to... Figures 1-3 The following explanation is provided. The ophthalmic device 10 of this embodiment is a binocular open-type ophthalmic device that simultaneously measures the characteristics of both eyes when the subject has both eyes open. However, this explanation is not limited to the binocular open type; the present invention can also be applied to ophthalmic devices that measure the characteristics of a single eye.

[0023] [Overall structure of the ophthalmic device] The ophthalmic device 10 of this embodiment, such as Figure 1 As shown, the ophthalmic apparatus 10 includes a base 11 mounted on a floor surface, an optometry table 12, a support column 13, a cantilever 14 serving as a support, and a measuring unit 20. In this ophthalmic apparatus 10, the subject facing the optometry table 12 has their forehead placed on the forehead abutment (forehead contact portion) 15 located in the measuring unit 20, and features of the eye to be examined are measured. It will be noted that, as explained in this specification... Figure 1 As shown, the X-axis, Y-axis, and Z-axis are set, and viewed from the side of the subject, the left-right direction is the X-direction, the up-down direction (vertical direction) is the Y-direction, and the direction orthogonal to the X and Y directions (the inward direction of the measurement unit 20 (depth direction)) is the Z-direction.

[0024] The optometry table 12 is a table used to place the tester's controller 27 (described later), the testee's controller 28, or items used for eye examination, and is supported by the base 11. The optometry table 12 can be adjusted in position (height) in the Y direction by the base 11.

[0025] The support column 13 is erected in the Y direction from the rear end of the optometry table 12, and a cantilever (support) 14 is provided on the upper part. The cantilever 14 is mounted on the support column 13 and supports a pair of measuring heads 23 above the optometry table 12 via a pair of drive mechanisms 22.

[0026] The cantilever 14 is movable relative to the support column 13 in the Y direction. It should be noted that the cantilever 14 is also movable relative to the support column 13 in both the X and Z directions. A measuring unit 20 with a pair of measuring heads 23 is provided at the front end of the cantilever 14 via a drive mechanism 22.

[0027] In the base 11, the control units 26 of each unit of the integrated ophthalmic control device 10 are housed and installed in the control box 26b. It should be noted that power is supplied to the control units 26 from a commercial power source via power line 17a.

[0028] [Measurement Unit] The measurement unit 20 performs either subjective or objective testing. Subjective testing involves presenting a visual target to the subject and obtaining results based on the subject's response to the target. Subjective testing includes subjective refraction tests such as distance vision tests, near vision tests, contrast tests, and glare tests, as well as visual field tests (campimetry). Objective testing involves illuminating the eye under examination and measuring information (features) related to the eye based on the detection results of the returned light. Objective testing includes measurements to acquire features of the eye under examination and image acquisition of the eye. Furthermore, objective testing includes objective refraction tests (reflection measurements), corneal shape tests (corneal tests), intraocular pressure measurements, fundus photography, tomographic imaging using optical coherence tomography (OCT), and OCT-based tests.

[0029] Additionally, the measuring unit 20 is connected via control / power line 17b (see reference). Figure 2 The measurement unit 20 is connected to the control unit 26 and is powered by the control unit 26. In addition, the information transmission and reception between the measurement unit 20 and the control unit 26 are also carried out through the control / power line 17b.

[0030] Measurement unit 20, such as Figure 2As shown, it includes: a mounting reference 21, a left eye drive mechanism 22L and a right eye drive mechanism 22R disposed on the mounting reference 21, a left eye measuring head 23L supported by the left eye drive mechanism 22L, and a right eye measuring head 23R supported by the right eye drive mechanism 22R.

[0031] The left eye measuring head 23L and the right eye measuring head 23R are configured symmetrically in the X direction with a vertical plane located at the midpoint between them. Furthermore, the structures of each drive unit of the left eye drive mechanism 22L corresponding to the left eye measuring head 23L, and the structures of each drive unit of the right eye drive mechanism 22R corresponding to the right eye measuring head 23R, refer to structures that are symmetrically arranged in the X direction with a vertical plane located at the midpoint between them. Hereinafter, unless otherwise specified, they will sometimes be referred to simply as measuring head 23 and drive mechanism 22. The same applies to other components that are symmetrically arranged on both sides.

[0032] The mounting base 21 is fixed to the front end of the cantilever 14 and extends in the X direction. The left eye is suspended from one end by a drive mechanism 22L, and the right eye is suspended from the other end by a drive mechanism 22R. In addition, the forehead abutment 15 is suspended from the center of the mounting base 21.

[0033] The left eye drive mechanism 22L, based on control commands from the control unit 26, changes the position of the left eye measuring head 23L in the X, Y, and Z directions, as well as the position relative to the eyeball rotation axis OL of the left eye EL (see...). Figure 2 The direction centered on ). For example Figure 2 As shown, the left eye drive mechanism 22L has a left vertical drive unit 22a, a left horizontal drive unit 22b, and a left rotation drive unit 22c. These drive units 22a to 22c are arranged sequentially from the top side between the mounting reference unit 21 and the left eye measuring head 23L.

[0034] The left vertical drive unit 22a moves the left horizontal drive unit 22b relative to the mounting reference unit 21 in the Y direction. The left horizontal drive unit 22b moves the left rotation drive unit 22c relative to the left vertical drive unit 22a in the X and Z directions. The left rotation drive unit 22c rotates the left eye measuring head 23L relative to the left horizontal drive unit 22b around the eyeball rotation axis OL of the left eye EL.

[0035] The right eye drive mechanism 22R, based on control commands from the control unit 26, changes the position of the right eye measuring head 23R in the X, Y, and Z directions, and adjusts the position relative to the eyeball rotation axis OR of the right eye ER. Figure 2 (Referencing) the direction centered on. For example... Figure 2As shown, the right eye drive mechanism 22R has a right vertical drive unit 22d, a right horizontal drive unit 22e, and a right rotation drive unit 22f. These drive units 22d to 22f are arranged sequentially from the top side between the mounting reference unit 21 and the right eye measuring head 23R.

[0036] The right vertical drive unit 22d moves the right horizontal drive unit 22e relative to the mounting reference unit 21 in the Y direction. The right horizontal drive unit 22e moves the right rotation drive unit 22f relative to the right vertical drive unit 22d in the X and Z directions. The right rotation drive unit 22f rotates the right eye measuring head 23R relative to the right horizontal drive unit 22e around the eyeball rotation axis OR of the right eye ER.

[0037] Here, the left vertical drive unit 22a, the left horizontal drive unit 22b, the right vertical drive unit 22d, and the right horizontal drive unit 22e each have: an actuator that generates driving force such as a pulse motor, and a transmission mechanism that transmits driving force by multiple gear sets or racks and pinions. It should be noted that the actuator and transmission mechanism of the left horizontal drive unit 22b and the right horizontal drive unit 22e can be combined and arranged in the X and Z directions respectively, which simplifies the structure (configuration) and facilitates easy control of horizontal movement.

[0038] Furthermore, the left rotation drive unit 22c and the right rotation drive unit 22f have actuators that generate driving force such as pulse motors, and transmission mechanisms that transmit driving force by multiple gear sets or gear racks. Here, the left rotation drive unit 22c and the right rotation drive unit 22f cause the transmission mechanism that receives driving force from the actuator to move along an arc-shaped guide groove centered on the eyeball rotation axes OL and OR, so that the left eye measuring head 23L and the right eye measuring head 23R can be rotated with the eyeball rotation axis OL of the left eye EL and the eyeball rotation axis OR of the right eye ER, respectively.

[0039] It should be noted that the left rotation drive unit 22c and the right rotation drive unit 22f can also rotatably mount the left eye measuring head 23L and the right eye measuring head 23R around their respective rotation axes.

[0040] By using the left rotation drive unit 22c and the right rotation drive unit 22f, the left eye measuring head 23L and the right eye measuring head 23R are rotated in the desired direction, which can cause the eye under examination to diverge (divergence movement) or converge (convergence movement). Thus, the ophthalmic device 10 can perform divergence and convergence movement tests, and can perform distance and near vision tests to measure various characteristics of the two eyes under examination in a binocular vision state.

[0041] like Figure 2 , Figure 3As shown, the left-eye measurement head 23L has a left-eye measurement optical system 24L built into the left outer shell 23a fixed to the left rotation drive unit 22c, and a left-eye deflection member 25L disposed on the outer side of the left outer shell 23a. Furthermore, close to the left-eye deflection member 25L, within the left outer shell 23a, two cameras (stereo cameras) 40L and 41L are disposed front-to-back (Z-direction) as imaging units to hold the optical axis of the left-eye measurement optical system 24L. The left-eye measurement head 23L measures left-eye characteristics by bending the light emitted from the left-eye measurement optical system 24L through the left-eye deflection member 25L and directing it onto the subject's left eye EL (see [reference]). Figure 3 In addition, each camera 40L and 41L acquires anterior eye images of the subject's left eye EL (more specifically, anterior eye images taken from the oblique transverse direction at the intersection of visual axes) through the left eye biasing component 25L.

[0042] In addition, such as Figure 2 , Figure 3 As shown, the right eye measurement head 23R includes: a right eye measurement optical system 24R built into the right outer shell 23b fixed to the right rotation drive unit 22f, and a right eye deflection member 25R disposed on the outer side of the right outer shell 23b. Furthermore, close to the right eye deflection member 25R, two cameras (capturing units) 40R and 41R are disposed in the right outer shell 23b to hold the optical axis of the right eye measurement optical system 24R and are positioned in the front and rear (Z direction). The right eye measurement head 23R measures right eye characteristics by bending the light emitted from the right eye measurement optical system 24R through the right eye deflection member 25R and directing it onto the right eye ER of the subject (see [reference]). Figure 3 In addition, each camera 40R and 41R acquires anterior eye images of the subject's right eye ER, which are flexed and incident through the right eye using the deflection component 25R.

[0043] In this embodiment, by simultaneously capturing images of the eye E (EL, ER) to be examined from different directions using each camera 40 and 41, two different anterior eye images can be obtained. It should be noted that the positions of the left and right cameras are not limited to front-to-back; they can also be positioned vertically, clamping the optical axis. Furthermore, the number of cameras is not limited to two; for example, three or more cameras can be arranged, such as four in the front-to-back and four vertically, to acquire more anterior eye images. Additionally, the cameras 40 and 41 can be mounted outside the housings 23a and 23b, or placed in desired positions depending on the size or design of each component.

[0044] Here, "substantially simultaneous" means that when shooting with two or more cameras 40 and 41, deviations in shooting timing, such as those due to eye movement, are allowed. By shooting the anterior eye of the eye to be examined, E, from different directions substantially simultaneously with two or more cameras 40 and 41, two or more images of the eye to be examined, E, in the same position (direction) can be obtained.

[0045] The left-eye measuring optical system 24L and the right-eye measuring optical system 24R can be configured individually or in combination with the following components: a visual acuity testing device that performs visual acuity testing while switching between separately presented visual targets; a tracker (integrated refractive instrument) that acquires the appropriate corrective refractive power of the eye under examination while switching and configuring corrective lenses; a reflective instrument or wavefront sensor for measuring refractive power; a fundus camera for capturing fundus images; a tomographic imaging device for capturing retinal tomographic images; a mirror microscope for capturing corneal endothelial images; a corneal measuring instrument for setting the corneal shape; and a tonometer for measuring intraocular pressure, etc.

[0046] [Measuring Optical System] Reference Figure 3 , Figure 5 An example of the configuration of the measurement optical system 24L for the left eye and the measurement optical system 24R for the right eye will be described. Figure 3 This is a simplified structural diagram showing the left eye measurement optics system 24L and the right eye measurement optics system 24R of the ophthalmic device 10 of this embodiment. Figure 5 This is a detailed structural diagram of the 24R measurement optics system for the right eye. Figure 5 The deflection component 25R for the right eye is omitted. It should be noted that the structure of the measurement optics system 24L for the left eye is the same as that for the measurement optics system 24R for the right eye, therefore its description is omitted. The following description will only focus on the measurement optics system 24R for the right eye.

[0047] like Figure 5 As shown, the right eye measurement optical system 24R includes an observation system 31, a target projection system 32, an eye refractive power measurement system 33, a subjective testing system 34, an alignment optical system 35, an alignment optical system 36, and a corneal measurement system 37. The observation system 31 observes the anterior portion of the eye E to be examined, the target projection system 32 displays the target to the eye E, the eye refractive power measurement system 33 measures the eye refractive power, and the subjective testing system 34 performs subjective testing.

[0048] In this embodiment, the ocular refractive power measurement system 33 has the function of projecting a predetermined measurement pattern onto the fundus Ef of the eye under examination E and the function of detecting an image of the measurement pattern projected onto the fundus Ef. Therefore, the ocular refractive power measurement system 33 functions as a first measurement system that projects a light beam onto the fundus Ef of the eye under examination E and receives reflected light from the fundus Ef.

[0049] In this embodiment, the subjective inspection system 34 has the function of displaying a visual target to the eye E to be examined, and shares optical elements constituting the optical system with the visual target projection system 32. Alignment optical systems 35 and 36 are used to align the position of the optical system relative to the eye E to be examined. The control unit 26 acquires alignment information in the forward-backward direction (Z direction) along the optical axis of the observation system 31 through the alignment optical system 35, and acquires alignment information in the up-down and left-right directions (Y direction, X direction) orthogonal to the optical axis through the alignment optical system 36.

[0050] The observation system 31 includes an objective lens 31a, a dichroic filter 31b, a semi-reflective mirror 31c, an interrupted lens 31d, a dichroic filter 31e, an imaging mirror 31f, and an imaging element (CCD) 31g. In the observation system 31, the light beam reflected from the eye under examination E (anterior eye) is imaged on the imaging element 31g via the objective lens 31a and the imaging mirror 31f. Therefore, an anterior eye image E′ is formed on the imaging element 31g after the projection (projection) of the corneal beam, the beam aligned with the light source 35a, and the beam aligned with the light source 36a (bright spot image Br). The control unit 26 displays the anterior eye image E′, etc., based on the image signal output from the imaging element 31g on the display surface 30a of the display unit 30. A corneal measurement system 37 is provided in front of the objective lens 31a.

[0051] The corneal measurement system 37 includes a corneal plate 37a and a corneal measurement light source 37b. The corneal plate 37a is located near the objective lens 31a, is plate-shaped, and has a slit coaxial with the optical axis of the observation system 31. The corneal measurement light source 37b is positioned according to the slit of the corneal plate 37a. In this corneal measurement system 37, the light beam from the illuminated corneal measurement light source 37b is projected (projected) through the slit of the corneal plate 37a onto the eye E (cornea Ec) to be examined as a corneal measurement beam (a ring-shaped target for corneal curvature measurement) for measuring the shape of the cornea. This corneal measurement beam is reflected by the cornea Ec of the eye E to be examined, thereby forming an image on the imaging element 31g through the observation system 31. Therefore, the imaging element 31g detects (receives) the image of the annular corneal measurement beam, the control unit 26 displays the image of its measurement pattern on the display surface 30a, and measures the corneal shape (radius of curvature) based on the image signal from the image (imaging element 31g) using a known method. Thus, the corneal measurement system 37 is a second measurement system that projects a beam of light onto the anterior part (cornea Ec) of the eye to be examined E and measures the characteristics of the anterior part (cornea Ec) using the reflected light from the anterior part (cornea Ec), and functions as a corneal shape measurement system for measuring the corneal shape of the eye to be examined E. To explain, in this embodiment, as a corneal shape measurement system, an example is shown of a corneal plate 37a that uses about one to three annular slits and measures the curvature near the center of the cornea (corneal measurement system 37). However, any system that measures the corneal shape can use a plastic plate with multiple annular slits that can measure the shape of the entire cornea, or other configurations, and is not limited to the configuration of this embodiment. An alignment optical system 35 is disposed behind the corneal measurement system 37 (corneal plate 37a).

[0052] The alignment optical system 35 has a pair of alignment light sources 35a and projection lenses 35b. Each projection lens 35b forms a parallel beam from each alignment light source 35a, and projects (projects) this parallel beam onto the cornea Ec of the eye to be examined, E, through an alignment aperture provided in the corneal plate 37a. Thus, an alignment index is projected onto the cornea of ​​the eye to be examined, E. This index is detected in the form of a virtual image reflected from the corneal surface. Alignment using the index includes at least alignment along the optical axis of the measuring optical system 24R. Alignment using the index may also include alignment in the X and Y directions.

[0053] To explain, in this embodiment, the optical axis of the measuring optical system 24R is bent by the right-eye deflector 25R. At the position of the mirror image relative to the right-eye deflector 25R of the measuring optical system 24R, the optical axis of the measuring optical system 24R is approximately aligned with the Z-axis. Therefore, alignment of the measuring optical system 24R in the optical axis direction is equivalent to alignment in the Z-direction.

[0054] Alignment information in the Z direction (movement amount in the Z direction) is obtained by analyzing two or more images captured substantially simultaneously by two cameras 40 and 41. Alignment information in the XY direction (movement amount in the XY direction) is obtained based on the bright spot (bright spot image Br) on the corneal Ec of the anterior eye image projected onto the imaging element 31g.

[0055] Based on this alignment information, the control unit 26 drives the right horizontal drive unit 22e to move the right eye measuring head 23R in the front-back direction (Z direction), thereby performing alignment in the front-back direction (Z direction) along the optical axis of the observation system 31. Furthermore, this alignment in the front-back direction is achieved by adjusting the position of the right eye measuring head 23R so that the ratio of the interval between the two bright spot images Br of the alignment light source 35a on the imaging element 31g to the diameter of the corneal measurement image is within a specified range.

[0056] Here, the control unit 26 can also calculate the alignment offset based on this ratio and display the alignment offset on the display surface 30a. It should be noted that alignment in the front-to-back direction can be achieved by adjusting the position of the right eye measuring head 23R so that the focus of the bright spot image Br of the alignment light source 36a, described later, is consistent.

[0057] Additionally, an alignment optical system 36 is provided in the observation system 31. This alignment optical system 36 has an alignment light source 36a and a projection lens 36b, and shares a semi-reflective mirror 31c, a dichroic filter 31b, and an objective lens 31a with the observation system 31. The alignment optical system 36 forms a parallel beam from the beam of light from the alignment light source 36a through the objective lens 31a and then projects (projects) it onto the cornea Ec. The control unit 26 acquires alignment information (e.g., the amount of movement in the Y and X directions) based on the bright spot (bright spot image) of the cornea Ec projected (projected) onto the anterior eye image E′. Based on this alignment information, the control unit 26 drives the right horizontal drive unit 22e and the right vertical drive unit 22d, causing the right eye measuring head 23R to move in the left-right (X direction) and up-down (Y direction) directions, thereby performing alignment in the left-right (X direction) and up-down (Y direction) directions. At this time, in addition to the anterior eye image E′ that forms the bright spot image Br, the control unit 26 also displays the alignment mark AL, which serves as the standard alignment mark, on the display surface 30a. Furthermore, the control unit 26 controls the start of measurement upon completion of alignment.

[0058] The target projection system 32 (subjective inspection system 34) has a display screen 32a, a semi-reflecting mirror 32b, an interrupted lens 32c, a reflecting mirror 32d, a focusing lens 32e, an interrupted lens 32f, a field lens 32g, a variable cross cylindrical lens (VCC) 32h, a reflecting mirror 32i, and a dichroic filter 32j, and shares the dichroic filter 31b and objective lens 31a with the observation system 31.

[0059] Furthermore, the subjective testing system 34 has at least two glare sources 32k at positions around the optical axis on an optical path different from the optical path leading to the display screen 32a, which irradiate the eye E to be examined. The display screen 32a displays fixed targets or dot targets as visual targets for fixing the line of sight of the eye E to be examined, or displays subjective testing targets for subjectively testing the characteristics of the eye E to be examined (visual acuity value or correction (distance power, near power), etc.). The display screen 32a can use EL (electroluminescent) or liquid crystal display (LCD) to display any image under the control of the control unit 26. The display screen 32a is arranged in such a way that it can move along the optical axis at a position conjugate to the fundus Ef of the eye E to be examined on the optical path of the visual target projection system 32 (subjective testing system 34).

[0060] Furthermore, in the optotype projection system 32 (subjective testing system 34), a pinhole plate 32p is provided at a position approximately conjugate to the pupil of the eye under examination E in the light path. This pinhole plate 32p is formed by forming a through-hole in a plate component, allowing it to be inserted into and detached from the light path of the optotype projection system 32 (subjective testing system 34), with the through-hole positioned on the optical axis when inserted into the light path. The pinhole plate 32p can be inserted into the light path in the subjective testing mode, thereby enabling a pinhole test to determine whether correction can be achieved through the glasses of the eye under examination E. In this embodiment, the pinhole plate 32p is positioned between the field lens 32g and the VCC 32h, and is inserted and detached under the control of the control unit 26. It should be noted that the position of the pinhole plate 32p can be approximately conjugate to the pupil of the eye under examination E in the light path, but is not limited to this.

[0061] The eye refractive power measurement system 33 includes an annular beam projection system 33A that projects an annular measurement pattern onto the fundus Ef of the eye to be examined, and an annular beam receiving system 33B that detects (receives) the reflected light from the annular measurement pattern on the fundus Ef. The annular beam projection system 33A includes a reflective light source unit 33a, an interrupted lens 33b, a pupil annular aperture 33c, a field lens 33d, an aperture prism 33e, and a rotating prism 33f. It shares a dichroic filter 32j with the optotype projection system 32 (subjective testing system 34), and shares a dichroic filter 31b and an objective lens 31a with the observation system 31. The reflective light source unit 33a includes, for example, a reflective measurement light source 33g for reflective measurement using LED, a grating lens 33h, a conical prism 33i, and an annular pattern forming plate 33j, and they can move together on the optical axis of the eye refractive power measurement system 33 under the control of the control unit 26.

[0062] The annular beam receiving system 33B includes: an aperture 33p of an open-aperture prism 33e, a field lens 33q, a reflecting mirror 33r, an interrupting lens 33s, a focusing lens 33t, a reflecting mirror 33u, and shares with the observation system 31 an objective lens 31a, a dichroic filter 31b, a dichroic filter 31e, an imaging mirror 31f, and an imaging element 31g; it shares with the target projection system 32 (subjective inspection system 34) a dichroic filter 32j; and it shares with the annular beam projection system 33A a rotating prism 33f and an open-aperture prism 33e.

[0063] For the measurement or subjective examination of ocular refractive power using the right-eye measuring optical system 24R and the left-eye measuring optical system 24L as described above, for example, the same operation (action) can be performed as described in Japanese Patent Application Publication No. JP2017-63978, etc.

[0064] [Control Department] The control unit 26 centrally controls all parts of the ophthalmic device 10. For example... Figure 6 As shown, the control unit 26 is connected to the following components: the aforementioned left-eye measurement optical system 24L, the right-eye measurement optical system 24R, the left vertical drive unit 22a, the left horizontal drive unit 22b, and the left rotation drive unit 22c of the left-eye drive mechanism 22L, the right vertical drive unit 22d, the right horizontal drive unit 22e, and the right rotation drive unit 22f of the right-eye drive mechanism 22R, and the cantilever drive mechanism 16. In addition, it is connected to the following components: a detector controller (first input unit) 27 having cameras 40L, 41L and cameras 40R, 41L and a display unit 30, a subject controller (second input unit) 28, and a storage unit 29.

[0065] The tester controller 27 is used by the tester to operate the ophthalmic device 10. Although the tester controller 27 and the control unit 26 can be connected to each other via short-range wireless communication, they can also be connected via wire (wired communication).

[0066] In this embodiment, a portable terminal (information processing device) such as a tablet or smartphone is used as the tester controller 27. This allows the tester to hold and operate it, and to operate the subject and ophthalmic device 10 from any position, thus increasing the tester's freedom of movement during measurement. Furthermore, the tester controller 27 can be placed on the optometry table 12 for operation. Additionally, the tester controller 27 is not limited to a portable terminal; a laptop computer or a desktop computer can be used.

[0067] The tester controller 27 includes a display unit 30 formed by a liquid crystal display. This display unit 30 includes a touch-screen input unit 30b, which is superimposed on a display surface 30a (see reference 30a) displaying images, etc. Figure 4 , Figure 7 The configuration is as follows: When the examiner measures the characteristics of the eye to be examined, an instruction for alignment or an instruction for measurement is input from the input unit 30b. The display surface 30a displays either an anterior eye image E′ based on the image signal output from the imaging element (CCD) 31g provided on the observation system 31, or an operation screen 50 (see reference) as the input unit 30b. Figure 8 etc.

[0068] When acquiring various eye information of the eye E to be examined, the subject responds using the subject controller 28. The subject controller 28 is equipped with input devices such as a keyboard, mouse, and joystick. The subject controller 28 is connected to the control unit 26 via short-range wireless communication or wired communication.

[0069] The control unit 26 centrally controls the operation of the ophthalmic device 10 by expanding the program stored in the connected storage unit 29 or the built-in internal storage unit 26a onto, for example, RAM, based on appropriate operations of the controller 27 for the tester or the controller 28 for the subject. In this embodiment, the internal storage unit 26a is composed of RAM or the like, and the storage unit 29 is composed of ROM or EEPROM or the like.

[0070] Using the ophthalmic device 10 of this embodiment configured as described above, the XYZ direction alignment of the measuring head 23 is performed. Referring to the appendix, as a feature of the eye to be examined... Figure 7 Flowchart and Figures 8-11 The screen example illustrates one instance of the action taken when measuring (reflective measurement) the eye's refractive power (Refract).

[0071] The ophthalmic device 10 of this embodiment, under the control of the control unit 26, analyzes two different anterior eye images of the eye E to be examined, captured by two cameras 40 and 41, and automatically aligns the measuring head 23 by controlling the drive mechanism 22 based on the analysis results. Furthermore, the examiner can confirm the alignment or the state of the eye E to be examined based on the anterior eye image E′ (frontal image) of the anterior eye displayed on the display unit 30 of the examiner's controller 27. Thus, alignment can be performed quickly and with high precision, and the characteristics of the eye E to be examined can be measured quickly and with high precision.

[0072] In other words, based on the condition of the eye E being examined, there may be situations where alignment is not possible. The reasons for this could include, for example, inability to fixate, inability to use binocular vision, or the presence of tilt. ptosis Suppression can cause pupil constriction, head tilt, etc. However, in the past, the images displayed on the display during alignment were either images captured by two or more imaging units from the tilted direction of the anterior eye E being examined, or composite images, making it difficult to grasp these causes.

[0073] In contrast, in this embodiment, during alignment, the anterior eye image E′ (frontal image) of the eye to be examined E can be visually identified on the operation screen 50. Therefore, the examiner can accurately determine the reason for misalignment. Thus, by correcting the head position or alerting the subject, measures can be taken quickly, and the success rate of realignment can be improved.

[0074] When measuring the characteristics of the eye E to be examined, first, turn on the power and start the ophthalmic device 10, and start the browser or application software for the controller 27 used by the examiner, so that the operation screen 50 of the ophthalmic device 10 is displayed on the display surface 30a (see...). Figure 8 (etc.). This operation screen 50 functions as an input unit 30b for operating the ophthalmic device 10.

[0075] Next, the subject is seated in a chair or similar position, facing the ophthalmic device 10, and rests their forehead against the forehead resting part 15 of the measuring unit 20. Then, by setting the observation system 31 on the left and right measuring optical systems 24, anterior eye imaging of the left eye (EL) and right eye (ER) begins. Figure 8 As shown, the control unit 26 displays the frontal images (frontal images) EL′ and ER′ of the left eye EL and right eye ER based on the image signals output from the camera element 31g on the frontal image display areas 51L and 51R of the operation screen 50 (step S1).

[0076] The timing of capturing and displaying the anterior eye images EL′ and ER′ can be configured to occur at the moment the ophthalmic device 10 is activated, or at the moment when the subject rests their forehead against the forehead resting part 15 and is detected by sensors or the like. Alternatively, it can be configured to occur at the moment the subject gives a capturing instruction from the operation screen 50.

[0077] Furthermore, when observing the anterior eye image display areas 51L and 51R, and if there is a large offset in the positions of the anterior eye images EL′ and ER′, or if they were not captured, the cantilever 14 can be moved up and down by operating the up and down movement button 54 on the operation screen 50 to roughly adjust the height relative to the measuring head 23 of the eye to be examined, without making a precise adjustment. Rough adjustment means making a coarse adjustment instead of a precise one.

[0078] After making a rough adjustment to the height, automatic alignment (automatic position alignment) is performed for more precise positioning (step S2). Figure 8 The display shows a state where the upper part of the anterior eye image ER′ of the right eye ER is missing before automatic alignment is performed, and shows the right eye ER shifted from its proper position. Furthermore, if this shift is caused by the subject's head tilt, the head position can be returned to the proper (accurate) position by implementing measures such as alerting the subject or receiving assistance from the examiner, and the confirmation operation screen 50 can be used to confirm the operation.

[0079] The details of the automatic alignment process in step S2 will be explained below. The automatic alignment process is initiated by the operator touching the measurement start button 52 on the operation screen 50. The control unit 26, having received the start instruction, controls the alignment optical system 35 to project a parallel beam of light onto the cornea Ec of the eye to be examined, via an alignment aperture provided on the corneal plate 37a. Thus, an alignment indicator is projected onto the cornea of ​​the eye to be examined, E. This indicator is detected as a virtual image (Purkinje image) reflected from the corneal surface.

[0080] Furthermore, the control unit 26 obtains alignment information (each movement amount in the XY direction) based on the bright spot image Br formed on the anterior eye image E′.

[0081] On the other hand, under the control of the control unit 26, cameras 40 and 41 capture images of the anterior eye of the eye to be examined, E, from different directions, substantially simultaneously. This capture is a short video recording (video recording) of the anterior eye of the eye to be examined, with the anterior eye of the eye to be examined as the subject. Each camera 40 and 41 performs video recording of the eye to be examined, E, at a predetermined frame rate. Each camera 40 and 41 sends the acquired frames to the control unit 26 in real-time sequence. The control unit 26 correlates the frames acquired by each camera 40 and 41 according to the time of capture.

[0082] In addition, the control unit 26 corrects the skew (distortion) of each frame (frame) based on the aberration information stored in the storage unit 29. This correction process is implemented based on known image processing techniques, such as correction coefficients for correcting distortion aberrations.

[0083] The control unit 26 identifies feature locations, such as the location corresponding to the center of the pupil in the anterior eye, by analyzing each frame that has been corrected. Based on the distribution of pixel values ​​(brightness values, etc.) in the captured image (anterior eye image), the control unit 26 identifies the image region (pupil region) corresponding to the pupil of the eye E to be examined. Typically, since the pupil is drawn with lower brightness than other parts, the pupil region can be identified by searching for low-brightness image regions. In this case, the shape of the pupil can be considered when identifying the pupil region. That is, it is configured to identify the pupil region by searching for a roughly circular and low-brightness image region.

[0084] Next, the control unit 26 identifies the center position of the already identified pupil region. As described above, since the pupil is approximately circular, the outline of the pupil region is identified, and the center position of that outline (an approximate circle or ellipse) is identified and set as the pupil center. Additionally, the centroid of the pupil region can be determined and set as the pupil center.

[0085] Furthermore, even when there is a situation where the location of a feature corresponding to other feature parts exists, the location of the feature can be identified based on the distribution of pixel values ​​in the captured image, just as described above.

[0086] Next, based on the obtained feature location (pupil center), combined with Figure 6 The steps for obtaining the three-dimensional position information of the eye E to be examined are explained. Figure 6 A diagram schematically illustrates the positional relationship between two cameras 40 and 41 and the eye E to be examined.

[0087] exist Figure 6 In the diagram, "B" represents the distance (baseline length) between the two cameras 40 and 41. "H" represents the distance (shooting distance) between the baselines of the two cameras 40 and 41 and the feature region P of the eye being examined, E. "f" represents the distance (screen distance) between each camera 40 and 41 and its screen plane.

[0088] In this configuration, the resolution of the images captured by the two cameras 40 and 41 is represented by the following equation. Here, Δp represents the pixel resolution.

[0089] Resolution in the x and y directions (planar resolution): Δxy = H × Δp / f Resolution in the z-direction (depth resolution): Δz = H × H × Δp / (B × f) The control unit 26 is positioned relative to the two cameras 40 and 41 (their known positions) and the corresponding feature position P in the two captured images, taking into account the following: Figure 6Using the known triangulation method based on the configuration relationship shown, the three-dimensional position of the feature region P is calculated, that is, the three-dimensional position of the eye E to be examined is calculated.

[0090] Based on the calculated three-dimensional position of the eye to be examined E, the control unit 26 calculates the alignment information of the drive mechanism 22 in the Z direction in a manner that aligns the optical axis of the measuring optical system 24 with the axis of the eye to be examined E and sets the distance between the measuring optical system 24 and the eye to be examined E to a predetermined working (operating) distance. Here, the working distance, also referred to as the predetermined value of the operating distance, refers to the distance between the eye to be examined E and the measuring optical system 24 when measuring the features of the measuring optical system 24.

[0091] Based on the alignment information obtained as described above, the drive mechanism 22 is driven, and the measuring head 23 is moved along the XYZ direction to perform alignment in the XYZ direction. Since this alignment is performed on both the left eye measuring head 23L and the right eye measuring head 23R, even if there are slight deviations in the XYZ direction, the positions of the left eye EL and right eye ER can be properly aligned accordingly.

[0092] Furthermore, when cameras 40 and 41 capture video of the fore-eye from parallel directions, for example, by performing the following processes (1) and (2), the measurement optical system 24 can track the movement (movement) of the eye under examination (E). Thus, even when the eye under examination (E) moves, the alignment and feature measurement of the eye under examination (E) can be performed appropriately.

[0093] (1) The control unit 26 sequentially analyzes two or more frames that are substantially simultaneously captured by the video of the cameras 40 and 41, and sequentially calculates the three-dimensional position of the eye E to be examined.

[0094] (2) The control unit 26 controls the drive mechanism 22 sequentially based on the three-dimensional position of the eye to be examined E, so that the position of the measuring optical system 24 follows the movement of the eye to be examined E.

[0095] exist Figure 9 The diagram shows the state in which proper alignment is achieved, and the left and right anterior eye images EL′ and ER′ are displayed at appropriate positions in the anterior eye image display areas 51L and 51R. Thus, since the anterior eye images EL′ and ER′ are displayed sequentially in real time on the operation screen 50, the operator can accurately determine whether the alignment is appropriate while performing the measurement operation.

[0096] If alignment is complete, proceed to step S3, where a preliminary measurement is performed as a pre-measurement before measuring the eye's refractive power. The preliminary measurement refers to determining the approximate refractive power (eye's refractive index) of the eye E being examined, and is a preliminary measurement performed to determine the amount of movement of the focusing lens 32e. First, the focusing lens 32e is positioned at 0D (diopter), the fixation target is fixed, and the eye's refractive power is measured (preliminarily measured) using the eye refractive power measurement system 33.

[0097] Next, in order to perform this measurement (main measurement), realignment is performed (step S4). Realignment is performed in the same sequence as the automatic alignment in step S2 above.

[0098] Then, proceeding to step S5, the focusing lens 32e is moved to a position where the focus is misaligned, causing the eye E to be examined to be in a fogged state. In this fogged state, the subject with weak astigmatism can perceive the blurred image in all meridian directions and can bring the eye E to a state of accommodative rest (the state where the lens adjustment is removed). In this state of accommodative rest, the measurement of the eye's refractive power in the next step S6 can be performed.

[0099] In step S6, a reflective measurement (reflective measurement) of the eye E to be examined is performed. In this reflective measurement, the control unit 26 drives and controls the eye refractive power measurement system 33 based on the spherical power S, cylindrical power C (astigmatism power), and axial angle AX (astigmatism axis angle) obtained from the coarse measurement. Figure 10 The image shows the operation screen 50 when performing reflective measurements. Figure 10 The anterior eye image display areas 51L and 51R show the ring-shaped measurement patterns formed on the fundus Ef of the left eye EL and right eye ER, respectively, as shown by Kr.

[0100] The reflective measurement is performed in a known sequence, and a ring-shaped measurement pattern is projected onto the fundus Ef of the eye under examination, via a ring-shaped beam receiving system 33B, thereby forming a ring-shaped measurement pattern image Kr on the fundus Ef (see...). Figure 10 The image of the fundus Ef formed by the measurement pattern image Kr is collected by the objective lens 31a and imaged on the imaging element 31g via the optical system shared with the observation system 31. The imaging element 31g detects the annular measurement pattern image Kr and outputs an image signal based on the acquired image to the control unit 26.

[0101] Based on the image signal, the control unit 26 displays the measurement pattern image Kr of the left eye EL and the right eye ER on the anterior eye image display areas 51L and 51R, and calculates the spherical power S, cylindrical power C (astigmatism power), and axis angle Ax (astigmatism axis angle) of the eye E under test by analyzing the measurement pattern image Kr.

[0102] Next, in step S7, as Figure 11 As shown, the control unit 26 displays the values ​​of the spherical power S, cylindricity C, and axial angle AX calculated based on the left eye EL and right eye ER, respectively, on the measurement result display areas 53L and 53R of the operation screen 50. Additionally, the control unit 26 displays the anterior eye images EL′ and ER′ of the left eye EL and right eye ER, respectively, on the anterior eye image display areas 51L and 51R. Through the above operations, the refractive power measurement (reflection measurement) of the eye E under examination is completed.

[0103] The effects of the ophthalmic device 10 of this embodiment will now be explained. As described above, the ophthalmic device 10 of this embodiment includes: a measuring optical system 24, an imaging element (imaging unit) 31g, a display unit 30, two cameras 40 and 41, a drive mechanism 22, and a control unit 26. The control unit 26 acquires three-dimensional position information of the eye E to be examined based on two images captured by the cameras 40 and 41, and calculates the vertical and horizontal movement of the measuring optical system 24 based on the position information. Based on each movement, the control unit 26 controls the drive mechanism 22 to perform position alignment of the measuring optical system 24 for the eye E to be examined. During this position alignment, the control unit 26 displays an anterior eye image E′ on the optical axis of the measuring optical system 24 based on the image signal output from the imaging element 31g on the display unit 30.

[0104] This configuration allows for the precise and three-dimensional acquisition of the positional relationship between the eye under examination (E) and the measuring optical system 24 based on the images captured by cameras 40 and 41. Therefore, high-precision alignment over a wide range is possible. Consequently, even when the eye under examination has cataracts and the pupil center cannot be identified, the measuring optical system can be appropriately aligned with the eye under examination. Thus, the alignment status and the state of the eye under examination (E) can be accurately confirmed, positional alignment can be performed quickly and with high precision, and the characteristics of the eye under examination (E) can be appropriately measured.

[0105] Furthermore, whether this alignment is properly implemented is not based on the captured image taken by the cameras 40, 41 from an inclined direction relative to the optical axis, but can be confirmed based on the accurate front eye image (frontal image) E′ (real-time image) on the optical axis of the measuring optical system 24 displayed on the display unit 30 based on the image signal output from the imaging element 31g.

[0106] Therefore, it is possible to clearly observe the state of the eye E to be examined during the alignment period and to obtain very favorable results, for example, to properly grasp the state of the following (1) to (4).

[0107] (1) Unable to fixate.

[0108] (2) There is a tilt.

[0109] (3) Ptosis exists.

[0110] (4) There is pupillary constriction.

[0111] When the eye E to be examined is in the aforementioned state, there may be instances where effective alignment cannot be achieved. Therefore, by accurately understanding these states, the cause of alignment failures can be quickly and accurately identified. Furthermore, these defects can be corrected by reminding (warning) the subject to fixate, manually opening the eyelids, or advising them not to be nervous, thus enabling proper alignment. As a result, the characteristics of the eye E to be examined can be measured more quickly and with higher precision.

[0112] In addition, when measuring the characteristics of the eye E to be examined, the anterior eye image E′ (frontal image) can also be displayed on the operation screen 50. Therefore, the state of the eye E to be examined can be confirmed during the measurement, the measurement accuracy can be improved, and the reason for measurement failure can be identified.

[0113] Furthermore, in this embodiment, the measurement optical system 24 can be set up in pairs corresponding to the left eye EL and right eye ER of the subject, enabling binocular vision measurement. Each pair of measurement optical systems 24 includes an imaging element 31g and cameras 40 and 41, respectively, and the control unit 26 is configured to display the anterior eye images EL′ and ER′ of the left eye EL and right eye ER on the display unit 30. With this configuration, in addition to the above (1) to (4), the state of the subject eye E, which is specific to binocular vision measurement, can be grasped as follows (5) to (7). Therefore, the alignment and measurement accuracy in simultaneous binocular vision measurement can be further improved. In particular, since it is possible to confirm whether significant fixation can be formed in binocular vision measurement, the measurement accuracy of binocular vision can be greatly improved.

[0114] (5) Inability to see with both eyes.

[0115] (6) There is inhibition.

[0116] (7) The head is tilted.

[0117] Furthermore, in this embodiment, the display unit 30 includes a touchscreen input unit 30b, which is configured to overlap the display surface 30a displaying the forearm image E′. When the control unit 26 performs alignment in accordance with the instruction input through the input unit 30b, it sequentially displays the forearm image E′ on the display surface 30a. With this configuration, the operator can confirm the alignment while performing the alignment operation. As a result, the operator's operability is greatly improved, and it is possible to quickly confirm whether the alignment is successful or to appropriately determine the cause of any failure.

[0118] Furthermore, in this embodiment, the control unit 26 extracts the feature regions of the eye E to be examined based on the images captured by the cameras 40 and 41, and simultaneously calculates the distance between the feature regions and the cameras 40 and 41. Based on this distance and a predetermined distance between the cameras 40 and 41, it calculates the three-dimensional position information of the eye E to be examined. With this configuration, the three-dimensional position information of the eye E to be examined can be obtained with higher precision, and the alignment accuracy can be improved.

[0119] Furthermore, in this embodiment, a cantilever 14 is provided to support the measuring optical system 24, a drive mechanism 22 is suspended on the cantilever 14, and the measuring optical system 24 is suspended on the drive mechanism 22. With this configuration, it is not necessary to place the drive mechanism 22 in front of the subject, and alignment of the measuring optical system 24 by the drive mechanism 22 in the XYZ direction can be achieved. Moreover, space can be provided in front of the subject, and an ophthalmic device 10 that does not cause pressure on the subject can be provided.

[0120] The ophthalmic device of the present invention has been described above based on the embodiments. However, the specific structure is not limited to these embodiments, and changes and additions to the design are permitted without departing from the subject matter of the present invention as contained in the claims of this patent application.

[0121] For example, in this embodiment, an example of the action during measurement of ocular refractive power and an example of the operation screen 50 displayed on the display surface 30a during the measurement have been described; however, the present invention is not limited thereto. The present invention is applicable to corneal shape measurement (corneal measurement), intraocular pressure measurement, fundus photography, OCT imaging, etc. Furthermore, it is also applicable to subjective refractive measurements or visual field examinations such as distance vision testing, near vision testing, contrast testing, and glare testing. The operation screens corresponding to these measurements are displayed on the display unit 30. By displaying the anterior ocular image (frontal image) E′ of the eye to be examined E on the operation screen, the examiner can appropriately observe the alignment and the state of the eye to be examined E while performing the measurement operation.

[0122] Furthermore, in this embodiment, a left-eye measurement optical system 24L and a right-eye measurement optical system 24R are provided, and the features of the eye under examination E are measured under binocular vision. However, the present invention is not limited to this. It can also be applied to the case of measuring the features of the eye under examination E under monocular vision. Therefore, while observing the monocular anterior eye image (frontal image) E′ displayed on the display unit 30, alignment and feature measurement can be performed quickly and with high precision. In addition, in the case of monocular vision and when only one measurement optical system 24 is provided, a measurement optical system 24 without the biasing component 25 can be used (see Figure 5 ).

[0123] (Explanation of reference numerals in the attached image) 10 ophthalmic devices 14. Cantilever (support section) 22 drive mechanism 24 Measurement Optical System 26 Control Department 30 Display Unit 30a display surface 30b Input Section 31g camera element (imaging unit) Cameras 40 and 41 (Filming Department) E. Eye to be examined EL left eye ER Right eye Image of the anterior eye of E′.

Claims

1. An ophthalmic device, characterized by, having: a measurement optical system that acquires information of an eye to be examined of an examinee; an imaging section that acquires an anterior eye section image on an optical axis of the measurement optical system of the eye to be examined; a display section that displays the anterior eye section image; two or more photographing sections that photograph an anterior eye section of the eye to be examined from different directions; a driving mechanism that moves the measurement optical system in a vertical direction, a horizontal direction, and an anteroposterior direction; and a control section that acquires position information of the eye to be examined in the anteroposterior direction based on two or more photographed images photographed by the two or more photographing sections, and acquires position information of the eye to be examined in the vertical direction and in the horizontal direction based on the anterior eye section image on the optical axis acquired by the imaging section; based on the acquired position information, calculates a movement amount of the measurement optical system in the vertical direction, a movement amount in the horizontal direction, and a movement amount in the anteroposterior direction, and controls the driving mechanism based on each movement amount to perform position alignment of the measurement optical system with respect to the eye to be examined; the control section displays the anterior eye section image on the display section while performing the position alignment of the measurement optical system with respect to the eye to be examined.

2. The ophthalmologic apparatus according to claim 1, characterized in that: the control section extracts a feature portion of the eye to be examined based on the photographed images acquired by the two or more photographing sections, and calculates distances between the feature portion and the two or more photographing sections, and calculates the three-dimensional position information of the eye to be examined from the distances and distances between the two or more photographing sections determined in advance.

3. The ophthalmologic apparatus according to claim 1 or 2, characterized in that: the aforementioned measurement optical system has an alignment light source that projects an alignment light to a cornea of the eye to be examined, the control section acquires the position information of the eye to be examined in the vertical direction and in the horizontal direction based on a bright spot image of the alignment light on the cornea of the eye to be examined projected onto the anterior eye section image acquired by the imaging section.

4. The ophthalmologic apparatus according to claim 1 or 2, characterized in that: a pair of the measurement optical systems each having the imaging section and the two or more photographing sections are provided corresponding to a left eye and a right eye of the examinee; the control section displays the anterior eye section images of the left eye and the right eye on the display section.

5. The ophthalmologic apparatus according to claim 1 or 2, characterized in that: a portable examinee controller communicable with the control section by wireless or wired communication is further provided; the examinee controller has a display section that displays the anterior eye section image, and a touch panel type input section overlaid on the display surface; the control section displays the anterior eye section images on the display section of the examinee controller in order based on an instruction input from the input section while performing the position alignment of the measurement optical system with respect to the eye to be examined.

6. The ophthalmologic apparatus according to claim 1, characterized in that: a forehead abutting section that supports a forehead of the examinee is further provided. ​ The control section starts the acquisition of the anterior eye portion image by the imaging section and the display of the anterior eye portion image on the display section at the time when the forehead of the subject is detected as being in contact with the forehead contact section.

7. The ophthalmic apparatus according to claim 6, wherein: a sensor that detects that the forehead of the subject is in contact with the forehead contact section is further provided; the control section starts the acquisition of the anterior eye portion image by the imaging section and the display of the anterior eye portion image on the display section at the time when the forehead of the subject is detected as being in contact with the forehead contact section by the sensor.

8. The ophthalmic apparatus according to claim 6 or 7, wherein: the display section is provided with a portable controller for the subject that is communicably connected to the control section by wireless or wired communication.

9. The ophthalmic apparatus according to claim 6 or 7, wherein: a pair of the measurement optical systems that respectively have the imaging section and two or more of the photographing sections are provided corresponding to the left eye and the right eye of the subject; the control section starts the display of the anterior eye portion images of the left eye and the right eye on the display section at the time when the forehead is detected as being in contact with the forehead contact section.

10. The ophthalmic apparatus according to claim 6 or 7, wherein: the control section extracts the feature portion of the subject eye based on the photographing images acquired by the two or more photographing sections, calculates the distance between the feature portion and the two or more photographing sections at the same time, and calculates the three-dimensional position information of the subject eye based on the distance and the distance between the two or more photographing sections that is determined in advance.

11. The ophthalmic apparatus according to claim 1 or 2, wherein: the control section displays an alignment mark that is a standard for the alignment of the measurement optical system with respect to the subject eye on the anterior eye portion image acquired by the imaging section when the alignment of the measurement optical system with respect to the subject eye is performed.

12. The ophthalmic apparatus according to claim 6 or 7, wherein: the control section displays an alignment mark that is a standard for the alignment of the measurement optical system with respect to the subject eye on the anterior eye portion image acquired by the imaging section when the alignment of the measurement optical system with respect to the subject eye is performed.

Images