JP6641730B2 - Ophthalmic apparatus and ophthalmic apparatus program - Google Patents

Description

  The present disclosure relates to an ophthalmologic apparatus for examining an eye to be inspected, and a program for an ophthalmologic apparatus.

As a conventional ophthalmologic apparatus, for example, an eye refractive power measuring apparatus, a corneal curvature measuring apparatus, an intraocular pressure measuring apparatus, a fundus camera, an OCT, an SLO, and the like are known. In these ophthalmic devices, it is common to move the optometry unit in the up, down, left, right, and front directions with respect to the eye to be examined by operating an operation member such as a joystick, and to align the optometry unit with a predetermined position with respect to the eye to be examined. (See Patent Document 1).
Further, in a conventional ophthalmologic apparatus, there has been proposed a device for performing positioning of an optometry unit with respect to an eye to be inspected based on an image of a face of an examinee (see Patent Document 2).

JP 2013-066760 A JP-A-10-216089

  However, the conventional ophthalmic apparatus cannot acquire the three-dimensional position information of the subject's eye and automatically perform the alignment.

  In view of the conventional problems, it is an object of the present disclosure to provide an ophthalmologic apparatus capable of performing automatic alignment and a program for the ophthalmologic apparatus.

  In order to solve the above problem, the present disclosure is characterized by including the following configuration.

(1) An ophthalmologic apparatus for examining an eye to be examined, an optometry unit for examining the eye to be examined, a first drive unit for moving the optometry unit relative to the eye to be examined three-dimensionally, and the first drive Means for photographing a face including at least one of the left and right eyes to be examined from two or more different positions, and controlling the first driving means, and moving the photographing means to the optometry. Control means for moving the eye to be examined from the images of the face photographed from the two or more different positions under the control of the first driving means. By controlling the driving of the first driving unit based on the acquired three-dimensional position information, the alignment of the optometric unit with respect to the eye to be inspected is obtained. The photographing means performs a first position and a second position different from the first position, wherein a distance to an eye to be examined first among left and right eyes to be examined is smaller than the first position. When the face is photographed at two positions, the face is photographed at the second position after photographing the face at the first position.
(2) An ophthalmologic apparatus program to be executed in an ophthalmologic apparatus for inspecting an eye to be inspected, wherein the program is executed by a processor of the ophthalmic apparatus, so that an optometry step for inspecting the eye to be inspected by an optometric unit; A driving step of relatively moving the optometry means in three dimensions, and a photographing means moved integrally with the optometry means in the driving step, the face including at least one of the left and right eyes to be examined is placed in two or more places. A first position and a second position different from the first position, wherein a distance to an eye to be inspected first among left and right eyes to be examined is different from the first position. When photographing the face at a second position smaller than one position, after moving the photographing unit to the first position together with the optometry unit In the first control step of moving to the second position, and in the first control step, three-dimensional position information of the subject's eye with respect to the optometry unit is obtained from images of the face photographed from the two or more different positions. And a second control step of, based on the acquired three-dimensional position information, moving the optometry means relative to the eye to be examined three-dimensionally and performing alignment of the optometry means with respect to the eye to be examined. The present invention is characterized in that it is executed by the ophthalmic apparatus.

It is a schematic diagram showing the appearance of this example. FIG. 2 is a block diagram illustrating a control system according to the embodiment. It is a schematic diagram showing an optical system of the present example. 4 is a flowchart illustrating a control operation according to the embodiment. FIG. 3 is a diagram illustrating an example of a face image captured by a capturing unit according to the embodiment. It is a figure explaining detection of three-dimensional eyes. It is a figure for explaining the example of change of this example.

  Hereinafter, the present embodiment will be briefly described with reference to FIGS. The ophthalmologic apparatus (for example, the ophthalmologic apparatus 1) of the present embodiment is, for example, an ophthalmologic apparatus for examining an eye to be inspected. For example, an ophthalmologic apparatus performs measurement, photographing, and the like of an eye to be examined. The ophthalmologic apparatus includes, for example, an optometry unit (for example, the optometry unit 2), a first driving unit (for example, the driving unit 4), an imaging unit (for example, the imaging unit 3), and a control unit (for example, the control unit). 70).

  The optometry unit examines, for example, an eye to be examined. The optometry unit includes, for example, a refractive power measurement device, a corneal curvature measurement device, an intraocular pressure measurement device, a fundus camera, an optical coherence tomography (OCT) that captures a tomographic image of the subject's eye, and a fundus of the subject's eye by scanning a laser. (Scanning Laser Ophthalmoscope) or the like that captures images.

  The first drive unit, for example, three-dimensionally moves the optometry unit with respect to the subject's eye. The control unit may perform alignment of the optometry unit with respect to the subject's eye by controlling the driving of the first drive unit. In addition, the first drive unit may perform alignment of the optometry unit with respect to the subject's eye by driving an optical member that changes the measurement optical axis or the working distance of the optometry unit.

  The imaging unit captures, for example, a face including at least one of the left and right eyes from two or more different positions.

  The control unit acquires, for example, three-dimensional position information of the subject's eye from images of the face photographed from two or more different positions. Then, the control unit controls the driving of the first driving unit based on the acquired three-dimensional position information, thereby performing alignment of the optometry unit with respect to the subject's eye. For example, the three-dimensional position information may be absolute position information (eg, absolute distance, absolute coordinates, etc.) or relative position information (eg, relative distance, relative coordinates, etc.). For example, the three-dimensional position information may be three-dimensional coordinates of the subject's eye based on coordinates set with reference to the base of the apparatus. Further, the three-dimensional position information may be a three-dimensional relative distance between the subject's eye and the optometry unit.

  The photographing unit may include, for example, a first photographing optical system (the photographing optical system 3A) and a second driving unit (for example, the driving unit 4 and the driving unit 4a). The second drive unit relatively moves, for example, the first photographing optical system with respect to the subject's eye. In this case, the control unit may control the second drive unit and move the first photographing optical system to photograph the face from two or more different positions. This eliminates the need for the photographing unit to include two photographing optical systems. Therefore, the size of the device can be reduced or the cost can be reduced. Further, even if there is a restriction on the position where the imaging unit is provided depending on the type of the optometry unit, it is easy to cope with the situation since there is only one imaging optical system. Note that the second driving unit may be used also as the first driving unit, or may be provided separately from the first driving unit.

  The control unit may move the first imaging unit optical system to the first position and the second position by controlling the driving of the second driving unit. The second position is, for example, a position different from the first position, and is a position where the distance to the eye to be measured first among the left and right eyes to be measured is smaller than the first position. In this case, the control unit may photograph the face at the first position using the first photographing optical system and then photograph the face at the second position. Thereby, compared with the case where the face at the first position is photographed after the second position, the distance for moving the optometry unit can be reduced, and the measurement time can be shortened.

  Note that the imaging unit may include a first imaging optical system and a second imaging optical system (for example, the imaging optical system 3B). For example, the second photographing optical system may photograph the subject's eye from a position different from that of the first photographing optical system.

  The imaging unit may image a face including both the left and right eyes from two or more different positions. In this case, the control unit may acquire the right eye position information and the left eye position information based on the image photographed by the photographing unit. The right eye position information is, for example, three-dimensional position information of the right eye. The left eye position information is, for example, three-dimensional position information of the left eye. For example, the control unit may perform alignment of the optometry unit with respect to the right eye based on the right eye position information, and may perform alignment of the optometry unit with respect to the left eye based on the left eye position information. Thereby, the alignment operation when measuring one of the left and right eyes to be examined and then measuring the other becomes smooth. In this case, the control unit may cause the storage unit (for example, the storage unit 74) to store the left and right three-dimensional position information.

  Note that, when imaging the face of the subject at two or more different positions, the imaging unit may perform imaging at each position such that the imaging optical axes are parallel. For example, the imaging unit may be configured such that the imaging optical axis of the imaging unit at the first position is parallel to the imaging optical axis of the imaging unit at the second position. In this case, it is not necessary to significantly change the conditions for detecting the subject's eye from the image of the imaging unit.

<Example>
An ophthalmologic apparatus according to the present disclosure will be described with reference to the drawings, using an eye refractive power measurement apparatus as an example. Of course, the ophthalmologic apparatus may be an eye refractive power measuring apparatus, a corneal curvature measuring apparatus, an intraocular pressure measuring apparatus, a fundus camera, an optical coherence tomography (OCT), a scanning laser ophthalmoscope (SLO), or the like.

  The ophthalmologic apparatus of this embodiment objectively measures, for example, the eye refractive power of the eye to be examined. For example, the ophthalmologic apparatus according to the present embodiment performs measurement for each single eye, but may be an apparatus that performs measurement simultaneously for both eyes (binocular vision). The ophthalmologic apparatus mainly includes, for example, an optometry unit, an imaging unit, a driving unit, and a control unit. The details will be described below.

<Appearance>
The appearance of the device will be described based on FIG. As shown in FIG. 1, the ophthalmologic apparatus 1 according to the present embodiment mainly includes an optometry unit 2, an imaging unit 3, and a driving unit 4. The optometry unit 2 inspects the eye E to be examined. The optometry unit 2 may include, for example, an optical system for measuring eye refractive power, corneal curvature, intraocular pressure, and the like of the subject's eye, or an optical system for photographing the anterior eye part, the fundus, and the like of the subject's eye E. Etc. may be provided. In the present embodiment, the optometry unit 2 for measuring the refractive power will be described as an example. The imaging unit 3 images, for example, the face of the eye to be inspected. The imaging unit 3 images, for example, a face including at least one of the left and right eyes from two or more different positions. The drive unit 4 moves, for example, the optometry unit 2 and the imaging unit 3 with respect to the base 5 in the up, down, left, right, front and rear directions (three-dimensional direction).

  Further, the ophthalmologic apparatus 1 of the present embodiment may include, for example, a housing 6, a display unit 7, an operation unit 8, a face support unit 9, and the like. For example, the housing 6 houses the optometry unit 2, the imaging unit 3, the driving unit 4, and the like. The display unit 7 displays, for example, an observation image of the subject's eye, a measurement result, and the like. The display unit 7 may be provided integrally with the device 1, for example, or may be provided separately from the device. The ophthalmologic apparatus 1 may include an operation unit 8. The operation unit 8 is used for various settings of the device 1 and operations at the start of measurement. Various operation instructions from the examiner are input to the operation unit 8. For example, the operation unit 8 may be various human interfaces such as a touch panel, a joystick, a mouse, a keyboard, a trackball, and buttons. The face support unit 9 may include, for example, a forehead pad 10 and a chin rest 11. The chin rest 11 may be moved up and down by driving the chin rest driving unit 12.

<Control system>
As shown in FIG. 2, the device 1 includes a control unit 70. The control unit 70 manages various controls of the device 1. The control unit 70 includes, for example, a general CPU 71 (Central Processing Unit) 71, a ROM 72, a RAM 73, and the like. For example, the ROM stores an ophthalmologic apparatus program for controlling the ophthalmologic apparatus, initial values, and the like. For example, the RAM temporarily stores various information. The control unit 70 is connected to the optometry unit 2, the imaging unit 3, the driving unit 4, the display unit 7, the operation unit 8, the chin rest driving unit 12, the storage unit (for example, a nonvolatile memory) 74, and the like. The storage unit 74 is, for example, a non-transitory storage medium that can retain stored contents even when power supply is cut off. For example, a hard disk drive, a flash ROM, a removable USB memory, or the like can be used as the storage unit 74.

<Shooting unit>
The imaging unit 3 captures, for example, a face including at least one of the left and right eyes from two or more different positions with respect to the eye E. For example, as shown in FIG. 3, the imaging unit 3 of the present embodiment includes, for example, a first imaging optical system 3A for imaging the face of the subject. The first imaging optical system 3A mainly includes, for example, an imaging element 3Aa and an imaging lens 3Ab. The imaging unit 3 of the present embodiment is moved with respect to the eye E by driving the driving unit 4, for example. Thus, the imaging unit 3 images the eye E from two or more different positions.

  Of course, the imaging unit 3 may include a second imaging optical system 3B that images the face of the subject from a position different from the first imaging optical system 3A (see FIG. 3). The second imaging optical system 3B mainly includes, for example, an imaging element 3Ba and an imaging lens 3Bb. Thereby, the imaging unit 3 may image the eye E from two or more different positions. Note that the imaging element 3Aa and the imaging element 3Ba may be shared.

  In FIG. 1, the imaging unit 3 is provided below the optometry unit 2, but the position of the imaging unit 3 is not limited to this. For example, the imaging unit 3 may be provided above the optometry unit 2 or may be provided on the side. Of course, the measurement optical axis of the optometry unit 2 and the imaging optical axis of the imaging unit 3 may be provided so as to be coaxial. Further, for example, the imaging unit 3 may be used also as an observation optical system 60 described later. Further, the imaging unit 3 may be arranged independently of the movement of the optometry unit 2. For example, the imaging unit 3 is provided on the base 5 so as to be three-dimensionally drivable, and is driven three-dimensionally with respect to the eye E by a driving unit 4 a (see FIG. 1) different from the driving unit 4. Good. Of course, as in the present embodiment, the first drive unit that moves the optometry unit 2 and the second drive unit that moves the imaging unit 3 may also be used.

<Optometrist>
The optometry unit 2 performs measurement, inspection, imaging, and the like of the eye E. The optometry unit 2 may include, for example, a measurement optical system that measures the refractive power of the eye E to be examined. For example, as shown in FIG. 3, the optometry unit 2 includes a measurement optical system 20, a fixation target presenting optical system 40, an alignment index projection optical system 50, and an observation optical system (imaging optical system) 60. May be provided.

  The measurement optical system 20 has a projection optical system (light projection optical system) 20a and a light receiving optical system 20b. The projection optical system 20a projects a light beam on the fundus oculi Ef via the pupil of the eye E to be examined. In addition, the light receiving optical system 20b takes out a reflected light beam (fundus reflection light) from the fundus oculi Ef through the pupil peripheral portion in a ring shape, and captures a ring-shaped fundus reflection image mainly used for measuring refractive power.

  The projection optical system 20a has a measurement light source 21, a relay lens 22, a hall mirror 23, and an objective lens 24 on the optical axis L1. The light source 21 projects a spot-like light source image from the relay lens 22 to the fundus Ef via the objective lens 24 and the center of the pupil. The light source 21 is moved by the moving mechanism 33 in the direction of the optical axis L1. The hole mirror 23 has an opening through which the light flux from the light source 21 through the relay lens 22 passes. The hall mirror 23 is arranged at a position optically conjugate with the pupil of the eye E to be examined.

  The light receiving optical system 20b shares the hole mirror 23 and the objective lens 24 with the projection optical system 20a. The light receiving optical system 20b has a relay lens 26 and a total reflection mirror 27. Further, the light receiving optical system 20b has a light receiving stop 28, a collimator lens 29, a ring lens 30, and an image sensor 32 on the optical axis L2 in the reflection direction of the hole mirror 23. As the imaging device 32, a two-dimensional light receiving device such as an area CCD can be used. The light receiving diaphragm 28, the collimator lens 29, the ring lens 30, and the image sensor 32 are moved by the moving mechanism 33 in the direction of the optical axis L2 integrally with the measurement light source 11 of the projection optical system 10a. When the light source 21 is arranged at a position optically conjugate with the fundus oculi Ef by the moving mechanism 33, the light receiving aperture 28 and the imaging element 32 are also arranged at positions optically conjugate with the fundus oculi Ef.

  The ring lens 30 is an optical element for shaping the fundus reflection light guided from the objective lens 24 via the collimator lens 29 into a ring shape. The ring lens 30 has a ring-shaped lens unit and a light blocking unit. When the light-receiving diaphragm 28 and the imaging element 32 are arranged at positions optically conjugate with the fundus oculi Ef, the ring lens 30 is arranged at a position optically conjugate with the pupil of the eye E to be examined. The imaging element 32 receives ring-shaped fundus reflection light (hereinafter, referred to as a ring image) via the ring lens 30. The image sensor 32 outputs the image information of the received ring image to the CPU 71. As a result, the CPU 71 performs display of a ring image on the display unit 7, calculation of refractive power based on the ring image, and the like.

  As shown in FIG. 3, in the present embodiment, a dichroic mirror 39 is arranged between the objective lens 24 and the eye E to be inspected. The dichroic mirror 39 transmits the light emitted from the light source 21 and the fundus reflection light corresponding to the light from the light source 21. The dichroic mirror 39 guides a light beam from a fixation target presenting optical system 40 to be described later to the eye E. Further, the dichroic mirror 39 reflects the anterior segment reflected light of the light from the alignment index projection optical system 50 described later, and guides the anterior segment reflected light to the observation optical system 60.

  As shown in FIG. 3, an alignment target projection optical system 50 is arranged in front of the eye E to be examined. The alignment target projection optical system 50 mainly projects a target image used for alignment (alignment) of the optical system with respect to the eye E to be inspected onto the anterior segment. The alignment target projection optical system 50 includes a ring target projection optical system 51 and a target projection optical system 52. The ring target projection optical system 51 projects the diffused light onto the cornea of the subject's eye E to project the ring target. The ring target projection optical system 51 is also used as an anterior segment illumination for illuminating the anterior segment of the subject's eye E in the ophthalmologic apparatus 1 of the present embodiment. The index projection optical system 52 projects parallel light onto the cornea of the eye E, and projects an infinity index.

  The observation optical system 60 includes an imaging lens 61 and an imaging element 62 on the optical axis L3 in the reflection direction of the half mirror 63. The imaging element 62 is arranged at a position optically conjugate with the anterior segment of the eye E. The imaging element 62 images the anterior segment illuminated by the ring target projection optical system 61. The output from the image sensor 62 is input to the CPU 71. As a result, the anterior eye image of the eye E to be inspected, which is captured by the image sensor 62, is displayed on the display unit 7. Further, in the imaging element 62, an alignment index image (in the present embodiment, a ring index and an infinity index) formed on the cornea of the eye E by the alignment index projection optical system 50 is captured. As a result, the CPU 71 can detect the alignment index image based on the imaging result of the imaging element 62. Further, the CPU 71 can determine whether the alignment state is appropriate based on the position where the alignment index image is detected.

  The optotype presenting optical system 40 has a light source 41, a fixation target 42, a relay lens 43, and an optical axis L4 in the reflection direction of the reflection mirror 46. The fixation target 42 is used to fixate the subject's eye E during objective refractive power measurement. For example, when the fixation target 42 is illuminated by the light source 41, the fixation target 42 is presented to the subject's eye E.

  The light source 41 and the fixation target 42 are integrally moved by the driving mechanism 48 in the direction of the optical axis L4. The presentation position (presentation distance) of the fixation target may be changed by moving the light source 41 and the fixation target 42. Thereby, it is possible to measure the refractive power by applying a cloud of fog to the eye E to be inspected.

<Control method>
Hereinafter, the control operation of the present apparatus 1 will be described based on the flowchart of FIG. The present apparatus 1 automatically performs alignment (alignment) between the optometry unit 2 and the eye E to inspect the eye E, for example. For example, the CPU 71 may start measurement based on an operation signal output from the operation unit 8 by an operation of the examiner. For example, the CPU 71 may receive a left / right eye selection signal for selecting an eye to be measured first from the left and right eyes E to be measured from the operation unit 8 and start the measurement. Note that the CPU 71 may cause the ophthalmologic apparatus 1 to execute the following processing steps by a program stored in the ROM 72, for example.

(Step S1)
First, the CPU 71 acquires the first image PICo captured by the image capturing unit 3 at the first position O (for example, may be the initial position) (see FIG. 5). Then, the CPU 71 detects the subject's eye E from the acquired first image PICo. The first image PICo acquired by the imaging unit 3 may be an image of one eye of the subject or an image of both eyes. In the present embodiment, as shown in FIG. 5A, the CPU 71 acquires a first image PICo in which both the left eye EL and the right eye ER of the subject are shown. The CPU 71 detects, for example, the eye E from the first image PICo, and acquires two-dimensional position information of the eye E in the first image PICo. For example, the CPU 71 acquires the two-dimensional coordinates (PLo (x, y), PRo (x, y)) of the left eye EL and the right eye ER based on the first image PICo (see FIG. 6). The CPU 71 may cause the storage unit 74 to store the acquired two-dimensional coordinates PLo and PRO of the eye E to be examined. Of course, when only one eye is shown in the first image PICo, the CPU 71 may acquire only the two-dimensional coordinates of one eye and store the result in the storage unit 74.

  As a method of detecting the subject's eye E from an image, for example, various image processing methods such as pupil detection by infrared imaging and edge detection of a luminance value can be mentioned. For example, when the subject's face is imaged by infrared, the skin appears white and the pupil appears black. Therefore, the CPU 71 may detect a circular and black (low luminance) portion as a pupil from an infrared image obtained by infrared imaging. Alternatively, the eye to be inspected may be detected by detecting a change in luminance of an image due to blinking. Using the method as described above, the CPU 71 may detect the eye E from the first image PICo and acquire its two-dimensional position information (eg, pixel coordinates).

(Step S2)
Subsequently, the CPU 71 drives the drive unit 4 to move the position of the imaging unit 3 to a second position Or (x, y, z) different from the first position O (x, y, z). The second position Or is, for example, a position where at least one of x, y, and z coordinates differs from the first position O. For example, the CPU 71 of the present embodiment moves the photographing unit 3 to a second position Or having a different x coordinate from the first position O.

(Step S3)
Next, the CPU 71 acquires the second image PICr photographed by the photographing unit 3 at the second position Or. Then, the CPU 71 detects the subject's eye E from the acquired second image PICr. The second image PICr acquired by the CPU 71 may be an image showing one eye of the subject or an image showing both eyes. However, the CPU 71 obtains a second image PICr in which at least one of the left image EL and the right eye ER has an eye in the first image PICo. In the present embodiment, as shown in FIG. 5B, a second image PICr in which both the left eye EL and the right eye ER of the subject are captured is acquired. The CPU 71, for example, detects the eye E from the second image PICr in the same manner as the first image PICo, and acquires two-dimensional position information of the eye E in the second image PICr. For example, the CPU 71 acquires two-dimensional coordinates (PLr (x, y), PRr (x, y)) of the left eye EL and the right eye ER based on the second image PICr. The CPU 71 may cause the storage unit 74 to store the two-dimensional coordinates PLr, PRr of the subject's eye E acquired based on the second image PICr.

(Step S4)
The CPU 71 determines the two-dimensional position information of the subject's eye E acquired based on the first image PICo and the second image PICr, and the positional relationship between the first position O and the second position Or at which the photographing unit 3 has photographed. To obtain three-dimensional position information of the eye E to be examined. For example, the CPU 71 may acquire three-dimensional position information of the eye E by stereo measurement. For example, when acquiring the three-dimensional position information of the right eye ER, the CPU 71 determines the O-ER from the relationship between the known position O of the imaging unit 3 and the coordinates PRo acquired in step 1 as shown in FIG. Acquire the straight line ARo including it. Similarly, the CPU 71 obtains a straight line ARr including Or-ER from the relationship between the known position Or of the imaging unit 3 and the coordinates PRr obtained in step 3. The CPU 71 obtains the intersection of the two straight lines ARo and ARr as the three-dimensional coordinates ER (x, y, z) of the right eye ER.

  When both eyes are detected from each of the first image PICo and the second image PICr as in the present embodiment, the CPU 71 determines the three-dimensional position information of both the left eye EL and the right eye ER (for example, EL (X, y, z) and ER (x, y, z)). The three-dimensional position information of the left eye EL is obtained in the same manner as described above. When the three-dimensional position information of both eyes is acquired, switching between left and right eyes can be performed smoothly (details will be described later).

(Step S5)
When the three-dimensional coordinates E (x, y, z) of the eye E are acquired, the CPU 71 determines whether the height (eye level) of the eye E is within an allowable range in which measurement can be performed by the eye examination unit 2. . For example, the allowable range is set based on the driving range of the optometry unit 2. For example, the allowable range may be set to the range of the height of the measurement optical axis L1 at the lower limit and the upper limit of the driving range of the optometry unit 2. If the eye level is outside the allowable range, the CPU 71 proceeds to step S6. If the eye level is outside the allowable range, the CPU 71 proceeds to step 7.

(Step S6)
When the eye level is outside the allowable range, for example, the CPU 71 controls the driving of the chin rest driving unit 12 to move the chin rest 11. For example, the CPU 71 may adjust the eye level by moving the chin rest 11 up and down. For example, the CPU 71 may adjust the height of the chin rest 11 so that the eye level is within an allowable range while detecting the eye E to be inspected based on the image captured by the imaging unit 3.

  When driving the chin rest 11, the CPU 71 may start driving the chin rest 11 based on a trigger signal output by operating the operation unit 8, or drive the chin rest 11. The start may be notified to the subject. This can prevent the chin rest 11 from unexpectedly moving without the subject's knowledge. In the present embodiment, the chin rest 11 is automatically moved up and down. However, the CPU 71 indicates the moving direction (for example, up and down) of the chin rest 11 on the display unit 7 or the like, and causes the subject to operate the operation unit 8. Thus, the chin rest 11 may be driven.

(Step S7)
When determining that the eye level is within the allowable range, the CPU 71 drives the drive unit 4 to move the optometry unit 2 toward the eye E to be examined. For example, the CPU 71 moves the optometry unit 2 based on the three-dimensional coordinates of the eye E acquired in step 4 (first alignment). As described above, by moving the optometry unit 2 based on the three-dimensional coordinates of the eye E obtained from the face image, it is possible to automatically perform alignment from a position where the optometry unit 2 and the eye E are separated. it can. This reduces the burden on the examiner.

  In the present embodiment, for example, after the optometry unit 2 is moved based on the three-dimensional coordinates of the eye E, fine adjustment (second alignment) is performed. For example, the CPU 71 detects the target image projected on the eye E by the alignment target projection optical system 50, and finely adjusts the positions of the optometry unit 2 and the eye E based on the position. In such a case, the CPU 71 may move the optometry unit 2 based on the three-dimensional position information of the subject's eye E to a range in which the index image can be detected. As described above, the CPU 71 may switch between the first alignment control and the second alignment control. Of course, the measurement of the eye to be inspected may be started at the time when the optometry unit 2 based on the three-dimensional coordinates is completed without performing the fine adjustment.

(Step S8)
When the movement of the optometry unit 2 to the alignable range is completed, the CPU 71 starts fine adjustment. For example, as described above, the target image projected onto the eye E by the alignment target projection optical system 50 is detected by the observation optical system 60. Then, the CPU 71 controls the driving unit 4 based on the position of the detected bright spot, and adjusts the measurement optical axis L1 of the optometry unit 2 to the eye E.

(Step S9)
When the fine adjustment is completed, the CPU 71 measures the eye E to be inspected. The optometry unit 2 of this embodiment measures the eye refractive power. Of course, not only the measurement of the refractive power but also various measurements / photographs and the like according to the type of the optometry unit are executed.

(Step S10)
When the measurement of one eye is completed, the CPU 71 controls the driving unit 4 to move the optometry unit 2 to the other eye. In the case of the above example, the CPU 71 moves the optometry unit 2 from the previously measured right eye ER measurement position to the left eye EL measurement position. When switching between the left and right eyes, the CPU 71 may move the optometry unit 2 based on, for example, the three-dimensional coordinates of both eyes of the eye E to be examined. For example, as in the present embodiment, when both eyes of the subject are shown in the first image PICo and the second image PICr, the CPU 71 acquires the three-dimensional coordinates of both eyes of the subject in steps 1 to 4. it can. In this case, the CPU 71 stores the acquired three-dimensional coordinates of the two eyes in the storage unit 74 and stores the three-dimensional coordinates of the eye whose measurement has not been completed when switching between the left and right eyes. 74 may be read. Then, the optometry unit 2 may be moved based on the read three-dimensional coordinates. Thus, by acquiring the three-dimensional position information of both eyes, it is not necessary to detect the position of the other eye after the measurement of one eye is completed, so that the switching between the left and right eyes can be performed smoothly.

(Step S11)
If the optometry unit 2 does not fall within the alignable range after switching between the left and right eyes, the optometry unit 2 may be moved again based on the image captured by the imaging unit 3. For example, the CPU 71 may move the optometry unit 2 based on the two-dimensional coordinates of the eye E acquired from the image captured by the imaging unit 3, or may capture the first image PICo and switch between the left and right eyes. The optometry unit 2 may be moved based on the three-dimensional coordinates of the subject's eye E obtained from the image captured by the unit 3.

(Step S12)
When the alignment with the other eye is completed, the CPU 71 measures the other eye as in step 9. For example, the CPU 71 may cause the display unit 7 to display the measurement result of the eye E obtained by the optometry unit 2.

  As described above, the ophthalmologic apparatus 1 according to the present embodiment uses the optometry unit for the eye E based on the three-dimensional position of the eye E obtained by photographing the face including the eye from two or more positions. 3 is performed. As a result, even an unskilled examiner can measure smoothly.

  Note that the CPU 71 may acquire three-dimensional position information of the subject's eye E and store it in the storage unit 74. The three-dimensional position information stored in the storage unit 74 may be obtained, for example, in steps 1 to 4 or may be obtained based on the position of the optometry unit 2 at the time of measurement. The CPU 71 may store the acquired face size of the subject in the storage unit 74. The face size may be, for example, the length from the eye E to the chin, or the relative position of the eye E to the chin rest 11. The face size may be acquired from the three-dimensional position information of the eye E and the height of the chin rest 11. For example, the height of the chin rest 11 may be detected by the position sensor 14 provided on the chin rest 11.

  For example, the CPU 71 may perform alignment of the optometry unit 2 with respect to the eye E based on the face dimensions stored in the storage unit 74. For example, the face size may be called from the storage unit 74 for each patient. Of course, the CPU 71 may function as an output unit that externally outputs the acquired face dimensions. For example, the CPU 71 may output the acquired face size to an external device and store it in an electronic medical record or the like. In this case, when measuring the patient, data may be read from the electronic medical record. The data output by the CPU 71 may be a method of printing a bar code, a QR code (registered trademark), or the like by a printer or the like. Accordingly, it is not necessary to detect the three-dimensional position information of the eye E before measurement, and the measurement time can be reduced.

  Note that the output unit (for example, the CPU 71) may output the acquired face size to another ophthalmologic apparatus, for example. Accordingly, in an ophthalmologic apparatus that does not have the imaging unit 3 or the like and cannot detect the three-dimensional position information of the eye E, the efficiency of alignment can be improved.

  In addition, the present apparatus 1 may include a face size receiving unit that receives an input of the face size of the subject. In the present embodiment, the CPU 71 may be used as a face size receiving unit. For example, the CPU 71 may receive a face size input to the operation unit 8 or a face size output from an external device. For example, the CPU 71 may perform alignment of the optometry unit 2 based on the received face size. For example, the CPU 71 may perform alignment of the optometry unit 2 with respect to the position of the subject's eye E estimated from the height of the chin rest 11. The face size may be measured by another device, for example.

  Note that, as in the present embodiment, when the face of the subject is photographed from two or more different positions by moving the photographing unit 3 by the driving unit 4, the second position Or is larger than the first position O. It may be set at a position where the moving distance is shorter with respect to the eye to be measured first. Thus, an image for acquiring three-dimensional position information can be taken while bringing the optometry unit 2 close to the eye E, and the efficiency of the alignment operation can be improved. For example, the second position Or may be a position in which the x coordinate is shifted from the first position O in the direction of the eye to be measured first. In this case, taking into account that the average value of the interpupillary distance is about 64 mm, the imaging may be performed at the second position Or, which is shifted from the first position O in the x direction by about 32 mm, which is half of that. This may reduce unnecessary operations during alignment. Of course, the second position Or may be set so that not only the x coordinate but also the y coordinate and the z coordinate are closer to the eye E than the coordinate of the first position O.

  The optometry unit 2 may include two or more different optometry units. For example, as shown in FIG. 7, a first measuring optical system 2a and a second measuring optical system 2b may be provided. In this case, based on the three-dimensional position information of the eye E acquired from the image of the photographing unit 3, the CPU 71 performs first drive control for aligning the eye E with the measurement optical axis of the first measurement optical system 2a, E and the second drive control for aligning the second measurement optical axis of the second measurement optical system 2b may be switched according to the measurement item. Thus, the CPU 71 can smoothly perform alignment even when the measurement order of the first measurement optical system 2a and the second measurement optical system 2b is switched. Further, even when only one of the first measuring optical system 2a and the second measuring optical system 2b is measured, there is little useless operation.

  Note that the CPU 71 may photograph the eye E under measurement by the photographing unit 3. Then, the CPU 71 may detect that the subject's eye E has shifted during the measurement based on the image photographed by the photographing unit 3. Further, the CPU 71 may detect the position of the eye E to be shifted during the measurement and acquire the three-dimensional position information again. For example, even if the position of the eye E is shifted while measuring one eye, the two eyes can be switched smoothly by acquiring the three-dimensional position information again. For example, when air is blown toward the eye E and the intraocular pressure of the eye E is measured based on a change in the shape of the eyeball at that time, the face of the subject may move. In such a case, by acquiring the three-dimensional position information of the eye E after the face has moved, the switching between the left and right eyes can be performed smoothly.

REFERENCE SIGNS LIST 1 ophthalmic apparatus 2 optometry unit 3 imaging unit 4 drive unit 5 base 6 housing 70 control unit 71 CPU
72 ROM
73 RAM

Claims (3)

An ophthalmic apparatus for examining an eye to be examined,
Optometry means for examining the subject's eye,
First driving means for moving the optometry means relative to the eye to be examined three-dimensionally;
An imaging unit that is moved together with the optometry unit by the first driving unit and captures a face including at least one of the left and right eyes to be examined from two or more different positions;
Control means for controlling the first driving means and moving the photographing means to the two or more different positions together with the optometry means,
The control unit acquires three-dimensional position information of the subject's eye from the image of the face photographed from the two or more different positions under control of the first driving unit, and acquires the three-dimensional position information. By controlling the driving of the first driving unit based on the above, the alignment of the optometry unit with respect to the subject's eye is performed,
A first position, a second position different from the first position, a second position having a distance to an eye to be examined first among left and right eyes to be examined earlier than the first position, Wherein the face is photographed at the first position, and then the face is photographed at the second position. The photographing means photographs a face including both the left and right eyes from two or more different positions,
The control means includes: a right-eye position information, which is three-dimensional position information of a right eye; and a three-dimensional image of a left eye, based on images obtained by photographing a face including both the left and right eyes from two or more different positions. Acquiring left eye position information that is position information, performing alignment of the optometry unit with respect to the right eye based on the right eye position information, and alignment of the optometry unit with the left eye based on the left eye position information The ophthalmologic apparatus according to claim 1, wherein: An ophthalmic apparatus program executed in an ophthalmic apparatus that examines an eye to be inspected, by being executed by a processor of the ophthalmic apparatus,
An optometry step of examining the subject's eye by optometry means,
A driving step of moving the optometry means relative to the eye to be examined three-dimensionally,
A photographing step of photographing a face including at least one of the left and right subject's eyes from two or more different positions by a photographing unit moved integrally with the optometry unit in the driving step;
In the photographing step, a first position, a second position different from the first position, a second position where the distance to the eye to be examined first among the left and right eyes to be examined is smaller than the first position, A first control step of moving the photographing unit to the first position after moving the photographing unit together with the optometry unit to the second position,
In the first control step, acquiring three-dimensional position information of the subject's eye with respect to the optometric unit from images of the face photographed from the two or more different positions, based on the acquired three-dimensional position information A second control step of three-dimensionally moving the optometry unit relative to the eye to be examined and aligning the optometry unit with the eye to be examined;
The program for an ophthalmologic apparatus characterized by causing the ophthalmologic apparatus to execute the following.

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