JP2023161290A - Ophthalmologic apparatus - Google Patents

Abstract

To solve such a problem that a subject cannot recognize a fixed target and cannot properly perform alignment.SOLUTION: An ophthalmologic apparatus comprises: an inspection optical head which inspects a subject eye by irradiating the subject eye with inspection light; an alignment unit which performs alignment between the subject eye and the inspection optical head; a fixed target optical system which is provided in the inspection optical head and projects a fixed target to a prescribed presentation position of a subject eye fundus; a fixed target control unit which can change a presentation position and/or a size of the fixed target; and a positional deviation detection unit which detects a positional deviation between the subject eye and the inspection optical head. The fixed target control unit repeatedly decides the presentation position and/or the size of the fixed target plural times such that a projection light flux of the fixed target passes through a pupil of the subject eye on the basis of the positional deviation detected by the positional deviation detection unit while the alignment unit is performing alignment.SELECTED DRAWING: Figure 4

Description

The present invention relates to an ophthalmological device.

As an ophthalmological device, we use a device for acquiring a two-dimensional image of the fundus of the eye to be examined (hereinafter referred to as a fundus camera device) and optical coherence tomography (OCT) using low coherence light. , a device for acquiring a tomographic image of an eye to be examined (hereinafter referred to as an OCT device) has been put into practical use.

In such an ophthalmological examination, fixation is required in order to examine a desired part of the eye to be examined.

Patent Document 1 discloses a technique for changing the size of an internal fixation target while moving it, in order to prevent the subject from losing sight of the internal fixation target when moving the internal fixation target.

Japanese Patent Application Publication No. 2004-141563

However, in order to realize fixation of the subject's eye, it is not enough to consider visibility only by moving the internal fixation target; for example, when examining the optic disc, the objective lens optical axis When fixating a position away from the patient's eye, as the optical head is brought closer to the subject's eye, the internal fixation target may suddenly appear at the edge of the visual field at a certain stage. Therefore, the subject may not be able to recognize the internal solid index and may not be able to properly perform alignment. Furthermore, when the internal solid index enters the field of view, the subject's eye may suddenly move, causing flare in the observed image, which may interfere with observation and alignment of the subject's eye.

An ophthalmological device according to an embodiment of the present invention includes:
an inspection optical head that tests the eye to be inspected by irradiating the eye to be inspected with inspection light;
an alignment unit that aligns the eye to be inspected and the inspection optical head;
a fixation target optical system provided in the examination optical head and configured to project a fixation target onto a predetermined presentation position of the fundus of the eye to be examined;
a fixation target control unit capable of changing the presentation position and/or size of the fixation target;
a positional deviation detection unit that detects a positional deviation between the eye to be examined and the inspection optical head;
An ophthalmological device having
The fixation target control unit,
The fixation target is controlled so that the projected light flux of the fixation target passes through the pupil of the eye to be examined based on the positional deviation detected by the positional deviation detection unit while the alignment unit is performing alignment. The ophthalmologic apparatus is an ophthalmologic apparatus in which a unit repeats determining the presentation position and/or size of the fixation target multiple times.

According to the present invention, it becomes easy to improve the visibility of a fixation target and stabilize visual fixation.

1 shows a schematic configuration example of an ophthalmologic apparatus according to a first embodiment. 1 shows an example of a schematic configuration of a control unit of a device according to a first embodiment. An example of a measurement flowchart of Example 1 is shown. 3 shows the initial presentation state of the fixation target in Example 1. 3 shows a mid-term presentation state of the fixation target in Example 1. 3 shows the final presentation state of the fixation target in Example 1. An example of a measurement flowchart of a modification of Example 1 is shown. An example of a measurement flowchart of Example 2 is shown. FIG. 7 is a diagram illustrating an example of a fixation target presentation position and a range of observable fixed target positions in a modified example of the first embodiment. FIG. 7 is a diagram illustrating an example of a method for determining an intermediate fixation target Tmi.

Hereinafter, exemplary embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions of components, etc. described in the following examples are arbitrary and can be changed depending on the configuration of the device to which the present invention is applied or various conditions. Additionally, in the drawings, the same reference numerals are used between the drawings to indicate elements that are identical or functionally similar.

[Example 1]
<Configuration>
The ophthalmologic apparatus used in this embodiment includes a fundus image capturing section that captures a two-dimensional fundus image, and a tomographic image capturing section that captures a three-dimensional tomographic image of the fundus of the eye to be examined using information based on optical interference. Be prepared.

A first example will be described below with reference to FIG. 1 showing a schematic configuration of an ophthalmologic apparatus and an optical system thereof.

In the following description, a direction that substantially coincides with the line of sight direction of the eye E to be examined will be referred to as the Z direction. Further, a plane perpendicular to the Z direction is an XY plane, a horizontal direction is an X direction, and a vertical direction is a Y direction.

The ophthalmological apparatus includes an optical head section (sometimes referred to as an inspection optical head) 100, a spectrometer 200, and a control section 300. Hereinafter, the configurations of the optical head section 100, spectrometer 200, and control section 300 will be explained in order.

<Configuration of optical head unit 100 and spectrometer 200>
The optical head unit 100 includes a plurality of optical systems for capturing two-dimensional images and tomographic images of the anterior segment Ea of the eye E to be examined and the fundus Ef of the eye to be examined. Various optical systems arranged within the optical head section 100 will be described below.

In the optical head section 100, an objective lens 101 that is shared by a plurality of optical systems is installed facing the eye E, and a first dichroic mirror 102 and a second dichroic mirror functioning as an optical path separation section are disposed on the optical axis L1. A dichroic mirror 103 is arranged. These dichroic mirrors branch the optical path of the anterior segment observation system (optical axis L2), the optical path of the fundus imaging system (optical axis L3), and the optical path of the OCT interference system (optical axis L5) for each wavelength band.

On the optical axis L2 in the reflection direction of the dichroic mirror 103, there is a lens 120, a split prism 121 having a pair of prisms having opposite polarization angles in the vertical direction at the center of the optical axis, an aperture 122, a lens 123, and sensitivity in the infrared region. An image sensor 124, which is a monochrome sensor, is arranged. The split prism 121 is arranged at a position that is optically conjugate with the pupil of the eye E when the optical head 100 is correctly aligned with the eye E, and the split prism 121 is arranged at a position that is optically conjugate with the pupil of the eye E to be examined, and if the distance in the Z direction (front-back direction) deviates from a predetermined distance. In this case, the upper and lower portions of the pupil of the eye E to be examined are imaged as split images in the left-right direction. By detecting this split amount, the alignment shift in the Z direction can be determined. Further, an anterior eye segment observation light source 125 placed near the objective lens 101 illuminates the anterior eye segment Ea.

The above is the anterior segment observation optical system for observing the anterior segment of the eye, and the image sensor 124 is connected to the control unit 300. Further, the anterior segment image acquired by the image sensor 124 is output to the display unit 302 via the control unit 300.

On the optical axis L3 in the transmission direction of the dichroic mirror 102, a perforated mirror 131, a photographic aperture 132, a focus lens 133, an imaging lens 134, a transparent mirror 135, and an image sensor 136 are arranged. The perforated mirror 131 has an opening in the center, and becomes optically conjugate with the pupil of the eye E when the optical head 100 is correctly aligned with the eye E. The focus lens 133 adjusts the focus by moving its position on the optical axis L3. The optical path on the optical axis L3 is branched, for example, by a transparent mirror 135 into an optical path leading to an image sensor 136 and an optical path leading to an LED array 137 which is a fixation target (fixation target optical system). The image sensor 136 is a fundus image sensor that is sensitive to visible light and infrared light and serves both for video observation and still image photography. In the fixation target optical system, an LED array 137 in which a plurality of LEDs are two-dimensionally arranged is arranged, and by selectively lighting up one element of the LED array, the fixation target of the eye E is guided. form a fixation target. Furthermore, by changing the position, the fixation position of the eye E to be examined can be changed. The fixation target projection light beam generated from the fixation target, which is an element of the LED array 137, is reflected on the surface of the transparent mirror 135, passes through the perforated mirror 131 and the photographing aperture 132, and is then refracted by the objective lens 101. and is projected onto the fundus Ef of the eye to be examined via the pupil of the eye to be examined. Of course, the display device constituting the fixation target may be any display device whose fixation target presentation position is variable, such as an LCD or a combination of a light source and a variable aperture.

On the optical axis L4 in the reflection direction of the perforated mirror 131, a corneal baffle 140, a relay lens 141, a focus index unit 142, a lens 143, and a ring slit 144 are arranged in this order. The corneal baffle 140 has a light-blocking point at the center. The ring slit 144 has a ring-shaped slit opening. Further, on the optical axis L4, a crystalline lens baffle 145 as a light shielding member having a light shielding point and a dichroic mirror 146 having a characteristic of transmitting infrared light and reflecting visible light are arranged. The focus index unit 142 is movable along the optical axis L4 and can be inserted and removed from above the optical axis L4.

In the reflection direction of the dichroic mirror 146, a condenser lens 147 and a white LED light source 148, which is a photographing light source, and which includes a plurality of white LEDs that emit visible pulsed light are arranged. On the other hand, in the transmission direction of the dichroic mirror 146, a condenser lens 149 and an infrared LED light source 150, which is an observation light source including a plurality of infrared LEDs that emit constant infrared light, are arranged. The objective lens 101, the dichroic mirror 146, the optical members therebetween, the condenser lens 147, and the condenser lens 149 constitute an illumination optical system that illuminates the fundus. The light from the white LED light source 148 or the infrared LED light source 150 illuminates the fundus of the eye to be examined through this illumination optical system.

Next, the optical path from the measurement light source 157, which is a light source that emits light for obtaining the measurement light to be input into the measurement optical path, the OCT optical system that forms the measurement optical path, the reference optical system that forms the reference optical path, and the interference light are separated into spectroscopy. The configuration of spectrometer 200 will be explained. The measurement light source 157, optical coupler 156, optical fibers 156-1 to 156-4, lens 158, dispersion compensation glass 159, reference mirror 160, and spectrometer 200 constitute a Michelson interference system. Optical fibers 156-1 to 156-4 are single-mode optical fibers connected and integrated with optical coupler 156, and light emitted from measurement light source 157 is guided to optical coupler 156 via optical fiber 156-1. The light guided to the optical coupler 156 is split by the optical coupler 156 into measurement light on the optical fiber 156-2 side and reference light on the optical fiber 156-3 side.

In this embodiment, an SLD (SupEf Luminescent Diode), which is a typical low coherent light source, is used as the measurement light source 157. The center wavelength of the light emitted from the measurement light source 157 is 880 nm, and the wavelength width is approximately 60 nm. Here, the wavelength width is an important parameter because it affects the resolution of the obtained tomographic image in the optical axis direction. Further, as for the type of light source, although SLD is selected here, it is sufficient that it can emit low coherent light, and ASE (Amplified Spontaneous Emission) or the like may also be used. Considering that the eye is to be measured, near-infrared light is appropriate as the center wavelength of the measurement light. In addition, as mentioned above, the characteristics of the dichroic mirrors 102 and 103 that branch the optical path of the fundus imaging system (optical axis L3) and the optical path of the OCT interference system (optical axis L5) for each wavelength band, and the anterior eye observation optical path (optical axis L2) The above wavelength of the measurement light was selected in consideration of providing a certain wavelength difference from the wavelength used in each optical path.

The above-mentioned measurement light is emitted from the output end of the optical fiber 156-2, which is a secondary light source, toward the focus lens 154, and passes through the optical path of the OCT optical system, which is a measurement optical path, to the fundus Ef of the eye E, which is the observation target. The light is irradiated, is reflected and scattered by the retina, becomes return light, and reaches the optical coupler 156 again through the same optical path. On the optical axis L5 in the reflection direction of the dichroic mirror 102 shared by the focus lens 154, there are a lens 151, a mirror 152, an OCTX scanner 153-1, an OCTY scanner 153-2, and lenses 154 and 155 that constitute the OCT optical system. further placed. The OCTX scanner 153-1 and the OCTY scanner 153-2 are, for example, galvanometric mirrors, and function as a scanning unit that scans the fundus Ef of the eye to be examined with measurement light. Furthermore, when the optical head 100 is correctly aligned with the eye E to be examined, the vicinity of the center position of the OCTX scanner 153-1 and the OCTY scanner 153-2 becomes a position that is optically conjugate with the pupil of the eye E to be examined. Note that although the OCTX scanner 153-1 and the OCTY scanner 153-2 each scan measurement light in a main scanning direction and a sub-scanning direction perpendicular to the main scanning direction, the scanning directions are not limited thereto. Note that in FIG. 1, the optical path between the OCTX scanner 153-1 and the OCTY scanner 153-2 is configured within the plane of the paper, but in reality it is configured in a direction perpendicular to the plane of the paper.

The aforementioned focus lens 154 is a lens for focus adjustment, and is driven by a motor (not shown) in the optical axis direction indicated by an arrow in the figure. Focus adjustment of the measurement light is performed so that the measurement light emitted from the end of the fiber serving as a light source is imaged onto the fundus Ef. By the focus adjustment described above, the image of the measurement light emitted from the fiber end can be formed on the fundus Ef of the eye E to be examined, and the return light reflected from the fundus Ef can also be efficiently returned to the optical fiber 156-2. I can do it.

On the other hand, the reference light reaches the reference mirror 160 and is reflected through the optical fiber 156-3, the lens 158, and the dispersion compensating glass 159 inserted to match the dispersion of the measurement light and the reference light. The reference light reflected by the reference mirror 160 returns along the same optical path and reaches the optical coupler 156 again. The reference light that has reached the optical coupler 156 again and the return light that is the measurement light are combined by the optical coupler 156. Here, when the optical path length of the measurement optical path and the optical path length of the reference optical path become almost the same, interference between the respective lights occurs due to this combination. The reference mirror 160 is held by a motor and a drive mechanism (not shown) so that its position can be adjusted in the optical axis direction indicated by an arrow in the figure. By using this motor or the like, the optical path length of the reference light can be adjusted to the optical path length of the measurement light, which varies depending on the eye E to be examined. The obtained interference light is guided to the spectrometer 200 via the optical fiber 156-4. In this embodiment, as explained above, a Michelson interferometer is used as an interferometer, but a Mach-Zehnder interferometer may also be used.

Spectrometer 200 includes a lens 201, a diffraction grating 202, a lens 203, and a line sensor 204. The interference light emitted from the optical fiber 156-4 becomes substantially parallel light through the lens 201, is separated by the diffraction grating 202, and is imaged onto the line sensor 204 by the lens 203. Each element in the line sensor 204 outputs a signal according to the received light. The control unit 300 samples this signal at a predetermined timing using an image acquisition unit 304, which will be described later, and performs predetermined signal processing to generate a tomographic image.

Further, the optical head section 100 includes a head drive section 170. The head drive section 170 is composed of three motors (not shown), and is configured to be able to move the optical head section 100 in three-dimensional (X, Y, Z) directions with respect to the eye E to be examined. . This allows alignment of the optical head section 100 with respect to the eye E to be examined.

<Configuration of control unit 300>
Next, a schematic configuration of the control section 300 will be described with reference to FIG. 2. The control unit 300 includes an imaging control unit 301, a fixation target control unit 3010, a drive control unit 3012, a storage unit 302, an image acquisition unit 304, and an image processing unit 305.

The imaging control section 301 is connected to the storage section 302, the optical head section 100, and the input section 340, and the imaging control section 301 performs the alignment operation stored in the storage section 302 based on the input signal from the input section 340. Each part of the optical head unit 100 is controlled so that an inspection sequence including the following is executed.

The fixation target control unit 3010 not only constantly lights up each LED element of the LED array 137, which is a fixation target, in accordance with the examination region stored in the storage unit 302, but also controls the Based on the result of detecting the amount of positional deviation between the optometrist E and the optical head section 100, the fixation light beam is moved from each element of the LED array 137 to a position where the fixation light beam can reach the fundus Ef of the eye to be examined via the pupil of the eye to be examined, or to that position. At least one of the closest elements is controlled to light up.

In anterior eye segment observation, the anterior eye segment observation light source 125 emits light, and the image output from the image sensor 124 is sent to the image acquisition unit 304.

In fundus infrared observation using a fundus camera, an infrared LED light source 150 for observation emits light, and the image sensor 136 receives the returned light from the fundus, which is used not only for fundus observation but also for tracking. Obtain an infrared observation image. The procedure is as follows. First, the video output from the image sensor 136 is sent to the image acquisition unit 304. Thereafter, the image acquisition unit 304 uses the image processing unit 305 to acquire the in-focus state obtained from the focus index projected onto the fundus infrared observation image by the focus index unit 142. Then, the focus lens 133 is driven based on the acquired in-focus state, and a focused infrared observation image of the fundus is acquired. When photographing a color fundus image, the focus lens 133 is moved to a position where the focus shift due to the difference in wavelength between the infrared LED light source 150 and the photographing white LED light source 148 is corrected, and then the white LED light source 148 is Visible pulsed light is emitted, and the reflected light from the fundus of the eye is also received by the image sensor 136. Further, the video output from the image sensor 136 is sent to the image acquisition unit 304.

In tomographic imaging, the imaging control unit 301 drives the focus lens 154 to adjust the focus of the OCT optical system based on the focus state obtained from the fundus infrared observation image described above, and also controls the OCTX scanner 153-1. , a scanning control signal is sent to the OCTY scanner 153-2, and the measurement light from the measurement light source 157 scans a predetermined imaging range of the eye Er to be examined one-dimensionally or two-dimensionally. During the scanning, interference light caused by the return light from one point in the imaging range and the reference light is received by the line sensor 204 in a separated state and sent to the image acquisition unit 304 . The output signal of the line sensor 204 is Fourier-transformed by the image processing unit 305 of the image acquisition unit 304 and converted into luminance or density (distribution) information in the depth direction (Z direction) at each point of the eye Er. . The brightness or density (distribution) information obtained in this way is called A-scan data or A-scan image.

A plurality of consecutive A-scans obtained by scanning the measurement light that generates A-scan data in a predetermined transverse direction on the fundus of the eye to be examined Er using the OCTX scanner 153-1 and the OCTY scanner 153-2. The image processing unit 305 can construct a tomographic image of the scanned region by arranging the images based on the scan information. For example, scanning in the X direction yields a tomographic image in the XZ plane, and scanning in the Y direction yields a tomographic image in the YZ plane. A scan in which the measuring light is scanned in a predetermined transverse direction on the eye Er to be examined in this manner is called a B-scan, and the obtained tomographic image is sometimes called a B-scan image. Furthermore, a plurality of B-scan images may be acquired by repeating this B-scan while moving in a predetermined direction. For example, by repeating B-scan on the XZ plane in the Y direction, three-dimensional information in the XYZ space can be obtained. Such a scan is called a three-dimensional scan, and data consisting of a plurality of obtained B-scan images is called three-dimensional data. From this three-dimensional data, a frontal image of the fundus of the eye Er can be obtained by a method described later.

The storage unit 302 stores an anterior segment observation image, an infrared fundus observation image, a fundus image, a B-scan image that is a tomographic image, three-dimensional data, and an OCT fundus front image acquired by the image acquisition unit. In addition, the test sequence that defines a series of control procedures for performing the test multiple times, generated images of the eye to be examined, image analysis results, imaging conditions at the time of image acquisition, so-called patient information regarding the eye to be examined, etc. , various programs for controlling anterior segment observation image capturing, fundus infrared observation image capturing using a fundus camera, fundus image capturing, and tomographic image capturing may also be stored.

The output control unit 303 is connected to a display unit 310 such as a display, and displays the anterior segment observation image, fundus infrared observation image, fundus image, B-scan image which is a tomographic image, and three-dimensional image stored in the storage unit 302. The content displayed on the display unit 310 and the sound outputted to the audio output unit 350 are controlled based on information such as data, OCT fundus front image, patient information, measurement conditions, and image measurement results. Note that there may be cases where there is no audio output section.

Note that the control unit 300 described above may be configured with a module executed by a CPU or MPU, or may be configured with a circuit such as an ASIC that implements a specific function. Furthermore, the storage unit 302 can also be configured using any memory or storage medium such as an optical disk.

<Location information detection method>
Next, a method of detecting positional information of the optical head section 100 with respect to the eye E using the anterior segment observation optical system and the image sensor 124 arranged on the optical axis L2 according to the present embodiment will be described. The image processing unit 305 calculates the relative positions (positional deviation amounts) of the eye E and the optical head unit 100 in the X, Y, and Z directions by analyzing the characteristics of the anterior segment observation image. For example, the anterior eye segment observation image acquired by the image sensor 124 is binarized using a predetermined threshold value, and the center of gravity position is calculated from the obtained pupil area. Then, the amount of positional deviation of the optical head section 100 in the X and Y directions is calculated from a comparison between the calculated center of gravity position of the pupil area and the reference position of the anterior segment observation image.

Furthermore, as described above, due to the function of the split prism 121, when the subject's eye E and the optical head section 100 are at a predetermined distance and the subject's eye pupil is in the split prism 121 portion on the anterior segment observation image, the split prism section The upper and lower images are not split and the outline of the pupil is continuous. On the other hand, at other distances, the outlines of the pupils in the upper and lower images are displayed shifted. By measuring the amount of displacement of this pupil, the amount and direction of positional displacement in the Z direction can be calculated. Here, the center of gravity of the pupil region is used as the feature of the anterior segment observation image, but the amount of positional shift may also be calculated based on the pupil center position, etc. Furthermore, it goes without saying that an index for alignment may be separately projected onto the cornea, and the amount of positional deviation may be calculated based on the index.

<Automatic alignment method>
Next, a method for automatically aligning the optical head section 100 with respect to the eye E according to this embodiment will be described. The drive control unit 3012 instructs the head drive unit 170 to start moving the optical head unit 100 according to the amount of positional deviation described above. Then, the head driving unit 170 drives three motors (that is, positioning units) (not shown) to move the position of the optical head unit 100 in three-dimensional (X, Y, Z) directions with respect to the eye E to be examined. Start and align.

For example, after a predetermined period of time has elapsed after the start of movement of the optical head unit 100, the image processing unit 305 acquires the anterior segment observation image again (for example, every 15 frames of the anterior segment observation image) and performs pupil detection. Next, the drive control unit 3012 determines whether the pupil of the eye E to be examined has been moved within a specified range on a preset display screen, and if it is determined that the pupil has been moved within this specified range, automatic alignment is performed. end. On the other hand, if the pupil of the eye to be examined does not fall within this specified range, the above-described process is repeated. Of course, automatic alignment may be continued even if it is determined that the object has been moved within the specified range.

<Inspection operation flow>
Next, the operational flow of the inspection in this embodiment will be explained using FIG. 3.

In S101, prior to imaging, the examiner selects a test set on a test set selection screen (not shown) displayed on the display unit 310. As an examination set, imaging conditions such as imaging modes, imaging parameters, alignment operations, left and right eyes, and examination areas (macula, center of the fundus, optic disc, etc.) for a plurality of examinations are selected. In this embodiment, the explanation will proceed assuming that one macular test has been selected. Although the test set is selected here, the test set may be set by the examiner.

In S102, when the screen advances from the test set selection screen to the photographing screen, the drive control unit 3012 drives the head drive unit 170 to move the optical head unit 100 to the initial position for one of the left and right eyes selected in the test set. Moving. Thereafter, the image acquisition unit 304 starts sequentially acquiring the anterior segment observation image, the fundus observation image, and the tomographic image, and displays the sequentially acquired anterior segment observation image, fundus observation image, and tomographic image as a preview image on the display unit 310. Display a moving image as At this time, the eye E to be examined is illuminated by infrared light from the anterior ocular segment observation light source 125. Of course, in this state, the optical head section 100 is not at a predetermined alignment position, so each image is not necessarily displayed correctly.

S103 is a pre-alignment preparation step. With the subject seated in front of the device, the examiner first displays the eye E on the anterior segment observation image by operating a GUI, etc. (not shown). The optical head section 100 is moved so that a part of the pupil is displayed. Of course, an anterior eye observation means having a large angle of view may be used so that a part of the pupil of the eye E to be examined is displayed on the anterior eye observation image from the initial position.

The image processing unit 305 performs pupil detection on the anterior segment observation images sequentially acquired by the image acquisition unit 304, and determines that a part of the pupil of the eye E to be examined is displayed on the anterior segment observation image. If so, proceed to the next step S104. Note that determining whether a part of the pupil of the eye E to be examined is displayed on the anterior segment observation image in S103 can be done by either the examiner or the device, but automation can reduce the examiner's work. Only the test set is set in S101, and an examiner is not required during the test.

FIG. 4 is a top view showing the positional relationship between the optical head section 100 and the subject's eye E at the beginning of S104, in which the optical head section 100 is placed at the initial position, and the line of sight of the subject's eye E is The figure shows a person looking aimlessly in 100 directions. Correctly aligning the optical head unit 100 means that the point Pe, which is the center of the pupil of the eye E, is aligned with the perforated mirror 131 while the patient is fixating on a predetermined fixation tag for the test. The purpose is to match the alignment target point P' which is the optical conjugate position of the center point P of the diaphragm 132 provided at the center of the aperture, but in this state, the pupil center Pe is on the optical axis with respect to the target point P'. There is a positional shift of ΔXs in the direction perpendicular to , and a positional shift of ΔZs in the optical axis direction, and the subject's eye is not fixated. As mentioned above, if the anterior segment observation image is misaligned in the direction perpendicular to the optical axis, the pupil of the subject's eye will be imaged eccentrically, and if it is misaligned in the optical axis direction, the anterior segment A pupil split left and right is observed by a split prism 121 provided on the observation optical path L2. Therefore, (with the optical head unit 100 set at the initial position) the image processing unit 305 calculates the amount of positional deviation ΔXs in the direction perpendicular to the optical axis (XY direction) from the center of gravity of the pupil that corrected this split amount, Further, the amount of positional deviation ΔZs in the optical axis direction (Z direction) can be calculated. The pupil diameter will also be measured.

In the next step S105, the fixation target control unit 3010 first calculates the range of fixed target positions that the eye E can currently observe from the positional shift amount, pupil diameter, and optical arrangement acquired in S104. That is, the fixation target control unit 3010 assumes that the principal ray R0 is directed toward the position of the pupil center Pe, and the principal rays R1 and R2 are directed toward the pupil edge. Among Enm, elements that can emit a fixation target projection light flux that can pass through the pupil of the eye to be examined are determined. FIG. 4 shows only the elements E1 to E11 on the optical axis in the Y direction among the 11×11 central elements of the LED array 137; Two elements, E8 and E9, sandwiched between R1 and R2, are determined to be capable of emitting a luminous flux. (Here, to simplify the diagram, two elements are observable, but in reality, each element of the LED array is arranged more densely than shown in the diagram, so more elements can be observed.) ) In this example, one macular examination is selected, so the final fixation target Te actually used during the examination is element E6 at the center of the matrix LED array. Even if it is turned on in the alignment state, the fixation tag light flux cannot pass through the pupil of the subject's eye, and the subject's eye E cannot see this final fixation target Te=E6. Therefore, the fixation target control unit 3010 selects the one that is closer to the final fixation target Te=E6 that should be used during the examination, among the two elements E8 and E9, which are elements that can emit an observable fixation tag luminous flux. The element E8 is determined as the initial fixation mark (that is, the initial presentation position of the fixation target) to be lit first as Ts=E8 and is lit. By fixating this, the subject's eye stabilizes its line of sight. Of course, at this point, the audio output unit 350 may also prompt the user to fixate the gaze using audio guidance.

FIG. 5 shows a state in which the eye E to be examined is slightly rotated counterclockwise in the plane of the paper in order to gaze at the initial fixation tag Ts=E8 that is lit for the first time. The positional deviation of the center of the pupil of the subject's eye changes to ΔXm and ΔZm due to its rotation, and the chief ray R0 of the fixation target light emitted from the initial fixation tag Ts=E8, which passes through P, which is the center point of the photographic aperture, is It passes through the alignment target point P', which is an optical conjugate point, and the pupil center point Pe of the subject's eye, and reaches the fovea of the retina. Note that if there is no range of fixation target positions that can be observed by the eye E (range of presentation positions of the fixation target where the projected light flux of the fixation tag passes through the pupil), a virtual fixation target position that passes through the pupil of the eye to be examined does not exist. A fixation target presentation position that is closest to the visual target position and/or a fixation target presentation position that includes the closest fixation target presentation position is determined.

In S106, the image processing unit 305 performs image processing perpendicular to the optical axis, for example, for every next 15 frames of the anterior segment observation images repeatedly acquired by the image acquisition unit 304 at a predetermined frame rate, according to the method in S104. The amount of positional deviation (ΔXm in FIG. 4B) in the direction (XY direction) and the amount of positional deviation (ΔZm) in the optical axis direction (Z direction) are calculated again.

If the amount of positional deviation is greater than or equal to the specified range in S107, the fixation target control unit 3010 changes the fixation target position in the next S108, and causes the drive control unit 3012 to drive the head according to the automatic alignment method described above. The automatic alignment operation of the optical head section 100 is continued by driving the section 170.

That is, in order to change the internal fixation target position, the fixation target control unit 3010 selects the element Eij of the matrix LED array to be lit next as the intermediate fixation tag Tm, corresponding to the positional deviation calculated in S106. is determined according to the method of S105. (Note that since FIG. 5 shows the initial position, Tm=Ts=E8.) Thereafter, the drive control section 3012 starts moving the optical head section 100 according to this positional deviation amount.

While this automatic alignment operation (loop repeating S106 to S108 multiple times) continues, that is, in S107, the control unit 300 determines that the amount of positional deviation of the eye to be examined is within a predetermined range that does not pose a problem when performing the test. As long as the presentation position of the optotype is controlled and the eye E to be examined does not move extremely violently, the amount of positional deviation between the optical head unit 100 and the eye E to be examined calculated from the anterior segment observation image becomes small. (In other words, when the amount of positional deviation detected by the positional deviation detection unit falls within a predetermined range, the predetermined presentation position is determined as the presentation position of the fixation target). In the state shown in FIG. 6 in which the automatic alignment is finally completed, that is, in the state in which the pupil center P' of the subject's eye coincides with the alignment target point P, all the light fluxes emitted from each element Enm of each matrix LED array are illuminated. It becomes possible to pass through the pupil of the eye and reach the retina Ef of the eye to be examined. In other words, as the amount of positional deviation decreases, the range of observable elements of the matrix LED array increases, and within that range, the current intermediate element selected as the closest element to the final fixation target Te, which is the predetermined position, expands. The fixation target Tm=Eij also gradually approaches the final fixation target Te and eventually coincides with the final fixation target Te. Thereafter, the automatic alignment operation is completed (branch YES in S107). At this time, if it is determined that the projected light flux of the fixation target passes through the pupil of the eye to be examined when the fixation target is presented at the position Te of the final fixation target to be used during the examination, the fixation target control The unit determines the predetermined presentation position as the presentation position of the fixation target.

As described above, in order to maintain the projection of the projection light beam of the fixation target onto the eye E during the automatic alignment operation, the movement of the optical head unit 100 and the change of the fixation target presentation position are controlled by the drive control unit 3012 and the fixation target. The target control unit 3010 cooperates and is controlled by the photographing control unit 301 to repeatedly move the target.

In S110, the inspection set in S101 is started.

In S111, the test results are displayed, and a screen for selecting test completion or retest is displayed.

In S112, the user selects whether to complete the test or retest on the screen for selecting test completion or retest, which was displayed together with the test results in S111. If the desired test result can be obtained, the test completion is selected, and if the desired test result is not obtained due to blinking or the like, the process returns to step S106 to recalculate the amount of positional deviation and performs the re-test.

[Example of modification of Example 1]
In the first embodiment, an example has been described in which a positional shift of the optical head unit 100 with respect to the eye E to be examined is detected, and in the state of the positional shift, a fixation target at a presentation position that can be observed by the eye E to be examined is repeatedly presented. However, the parameters controlled by the fixation target control unit may include not only the presentation position but also the display size.

In modification example 1, as an example in which the position and size are also controlled, all elements of the n×m matrix LED array are first turned on (maximum size), and then the presentation position and size of the fixed index are changed according to the detection of positional deviation. An example in which the value can be changed will be explained.

FIG. 7 shows the operational flow of inspection in this modified example. S201 and 202 are the same as S101 and S102, so they will be omitted, but depending on the type of test set in S101, the final fixation target Te when actually performing the test is, for example, Te=E4 in this modified example. The explanation will proceed assuming that it is set to .

Preparation for alignment performed in S203 is similar to S103, but the fixation target control unit lights up all elements of the n×m matrix LED array in FIG. 4. Therefore, the examiner instructs the subject to fixate the subject approximately at the center of all observable elements. As described above, in the state of FIG. 4, two elements E8 and E9 are observable, so the subject fixates on the center of E8 and E9 according to instructions from the examiner. Therefore, at the stage of S203, the positional relationship between the eye E to be examined and the optical head unit 100 is already close to that shown in FIG. 5, which has been rotated slightly counterclockwise in the drawing.

In the next step, S204, similarly to S104, the positional deviation detection section detects the amount of positional deviation between the optical head 100 and the eye E to be examined.

In S205, similarly to S105, the fixation target control unit 3010 assumes that the principal ray R0 is directed toward the position of the pupil center Pe, and the principal rays R1 and R2 are directed toward the pupil edge, and the fixation target control unit 3010 assumes that the chief ray R0 is directed toward the pupil center Pe, and the chief rays R1 and R2 are directed toward the pupil edge. Among the elements Enm of the LED array 137, the element that can emit a fixation tag light flux that can pass through the pupil of the eye to be examined is determined, and the final fixation target (this transformation In the example, the center position of the circular range that includes E8, which is the element closer to Te = E4), and the final fixation target Te = E6 is set as the center position of the range that lights up, and all the areas included in the circular range that is slightly larger than the radius The elements (E6 to E8 in the figure) are lit and presented as fixation targets.

The state of this selection will be explained with reference to FIG. 9, which is schematically represented. 9Emn shows each element at the center of the LED array 137, and according to FIG. 4, the element at the center in the height direction of the 11×11 matrix is indicated by En. Here, it is assumed that, for example, a fixation target of the size of one element at position E4 surrounded by a black frame is selected as the final fixation target Te. In S208, the fixation target control unit 3010 calculates the range of the currently observable fixed target position of the subject's eye E based on the positional shift of the optical head unit 100, and indicates the result as an observable range 410. To simplify the display, it is shown as a border here, but it has an elliptical shape that includes the pupil of the eye to be examined depending on the line of sight direction of the eye to be examined. The elements almost included in this observable range 410 are elements E8 and E9, and the element closest to element E4 at this time is E8. Therefore, the fixation target control unit 3010 next selects (the position and size of) a circular element selection range 420, for example, whose diameter is elements E4 to E8, including element E4 and element E8 closest to element E4. Then, E45 to 47, E54 to 58, E4 to 8, E74 to 78, and E85 to 87 included in the range are selected as the current intermediate fixation target Tm and lit. The reason why the circle range is set here is to simplify the processing, and any shape including the elements E4 to E8, such as an ellipse or a parallelogram, may be selected.

In the next step S206, similarly to S106, the amount of positional deviation between the optical head 100 and the eye E to be examined, for example, ΔXm, and the amount of positional deviation ΔZm in the optical axis direction (Z direction) are calculated again.

In S207, if the amount of positional deviation calculated in S205 is equal to or greater than the specified range, the process proceeds to S208 as in the first embodiment, and in S208, the amount of positional deviation calculated according to the automatic alignment method described above is determined. The loop in which the drive control unit 3012 drives the head drive unit 170 based on the above is repeated.

While this automatic alignment operation (loop repeating S206 to S208 multiple times) continues, the fixation target control unit 3010 repeats control of the presentation position and size of the target, as in the first embodiment. That is, after the drive control unit starts moving the optical head unit 100, the fixation target control unit 3010 adjusts the observable range 410 and the element selection range 420 based on the positional deviation of the optical head unit 100 obtained again in S208. Calculate. The results are shown in FIG. 9(b).

When the loop from S206 to S208 is repeated, the positional deviation of the optical head unit 100 usually becomes gradually smaller, so the observable range 410 becomes wider than the previous observable range shown in FIG. 10(b), and becomes observable. The number of elements approximately included in range 410 increases. At the same time, the center position of the element selection range 420 approaches element E4 and its radius decreases, such that the element closest to element E4 is E5 as shown in FIG. The number of elements selected and lit also decreases, like the two elements of E4E5. As described above, by repeating the loop from S206 to S208, the fixation tag approaches the final fixation target Te. Then, the fixation tag can finish changing its position and size when the final fixation target Te becomes observable, and finally the final fixation target Te=E4 is fixedly presented as the fixation target. be done.

In this modification example 1, since the lighting range is determined as described above, as the amount of positional deviation between the optical head section 100 and the eye E to be examined becomes smaller, the fixation target of this modification example (i.e., The size of the illuminated element (range of lit elements) gradually decreases, and its center position approaches the final fixation target Te, and after the final fixation target Te becomes observable, its size and position change to the final fixation target Te. It is matched with the fixation target Te. After the automatic alignment operation continues further, it is determined that the automatic alignment operation is completed, which is YES in the branch of S207.

In this modified example, since the size and position of the fixation tag are determined in this way, a larger (wider range) fixation tag is presented compared to the first embodiment. Therefore, it is not only possible to present a fixation tag that is easy to see even when the patient's eye line of sight is unstable, but also allows the patient to see the direction in which the fixation target will be guided, although the patient cannot see the entire fixation target. Since it becomes possible to grasp the object, more stable gaze guidance becomes possible.

Thereafter, when it is determined in S207 that the positional deviation amount calculated in S205 is less than the specified range, in S210, the inspection set in S201 is started as in the first embodiment. Thereafter, the operation is similar to that in the first embodiment.

[Example 2]
In Example 1, an example regarding control of the fixation target presentation position when one macular test is selected and alignment is performed has been described. In this modified example, as an example of an examination sequence in which a plurality of examination parts are sequentially examined, an example in which an OCT panoramic sequence is performed will be described using the examination flow diagram shown in FIG. 8. In S301 of FIG. 8, the examiner selects an OCT panoramic sequence on a test set selection screen (not shown) displayed on the display unit 310. In this embodiment, four partial areas constituting the area that can be imaged by the OCT panoramic sequence are arranged such that each partial area overlaps by 25%, and the image processing unit 305 functions as an image integration unit. Then, an image is created by integrating the photographed images of mutually adjacent partial areas. Note that the ratio of the overlapping partial areas is not limited to this, and the partial areas may be in contact with each other. Further, the number of areas is not limited to this. Further, although the integrated image is described here as a panoramic image, it may be another image.

Since four regions are currently set in the OCT panoramic sequence selected by the examiner, the imaging control unit assigns 0 to initialize the examination counter i (i = 0) and sets the upper limit of the counter. Set the value J to J=4-1. The imaging control in subsequent steps S302 to S309, especially the fixation target control and drive control, are the same as those in S102 to S109 in Example 1, so the explanation will be omitted. The initial fixation target Ts, intermediate fixation target Tm, and final fixation target Te are made to correspond to test counters and will be described as Tsi, Tmi, and Tei, respectively.

If it is confirmed in S309 that the fixation target after completion of alignment is the final fixation target Te0, the imaging control unit 301, in S310, selects a plurality of parts constituting the area in which the OCT panoramic sequence set in S301 is performed. A first OCT examination (i=0) is performed on the first partial region of the region. When the end of the first OCT test (i=0) is confirmed, the test counter i is compared with the counter upper limit value in S311. Now, since i=0<J=3, there remains an OCT inspection area (partial area) to be inspected, and in order to perform the next OCT inspection, the inspection counter i is counted up (i=1+1) in S312. After that, the process returns to S304, and the positional deviation of the eye to be examined is measured again. Thereafter, in S305, the initial fixation target Ts for the next OCT examination is determined, and a loop repeating S306 to S308, which is an automatic alignment operation, is started, as in the first embodiment.

How to determine the initial fixation target Tsi at the start of the loop and the intermediate fixation target Tmi during the loop repeating S306 to S308 will be explained using FIG. Now, for the sake of explanation, the final fixation target Te (i-1) in the previous OCT test (i = i-1) is, for example, E4, and the final fixation target Te in the next OCT test (i = i) For example, suppose that E9 is E9. Since the final fixation target Te (i-1) of the previous OCT examination (i = i-1) is performed with the subject's eye aligned, normally the final fixation target Te (i-1) of the previous OCT examination (i = i-1) will be as shown in Fig. 10 ( As shown in a), the subject can observe the final fixation target Te(i-1)=E4. That is, the final fixation target Te(i-1)=E4 in the previous OCT test (i=i-1) is included in the observable range 410 in the positional deviation state of the optical head section at the end of the test. Therefore, this Te(i-1) or a position near it may be employed as the initial fixation spot position for the next OCT examination (i=i). Then, the fixation target control unit 3010 moves from this position to the position of element E9, which is the final fixation target Tei of the next OCT examination (i=i), to E5, E6, and E9 so that the subject does not lose sight. The fixation target Tii, which moves slowly along the route to the intermediate fixation target Tmi, is set as the intermediate fixation target Tmi. After that, each time a positional shift is detected in S306 during the automatic alignment loop, it is confirmed whether the current intermediate fixation target Tmi is observable, and if it is observable, the position of the fixation target Tii is adjusted according to the setting. It will be changed gradually.

During this time, for example, at the end of the previous OCT test (i=i-1), if the patient took a break by moving his/her face away from the chin rest and then rested it on the chin rest again, or while the fixation target Tii is moving, When the positional deviation of the optical head unit 100 becomes large, such as when the person moves his/her face, the observable range 410 in the positional deviation state of the optical head unit initially becomes this Te( i-1) It becomes so small that it does not include the fixation target Tii set on the route from E4 to E9. In this way, when the fixation target control unit determines that the subject cannot observe the fixation target Tii, that is, the projected light flux of the fixation target from the fixation target Tii does not reach the fundus of the subject's eye. As explained in Example 1, is the final fixation target Tei=E9 among the four elements E45, E46, E55, and E56, which are elements that can emit a fixation target luminous flux observable to the subject. E56, which is the element closest to , is determined as the intermediate fixation tag Tmi= to be lit, and is lit.

Thereafter, while the imaging control unit 301 sequentially performs multiple OCT examinations (i=i), the fixation target control unit 3010 sets the initial fixation targets Tsi, Tmi, Tei in each OCT examination as described above. Decisions will be made.

Then, each time each OCT examination is completed, it is determined in S311 whether the examination of each partial area of the panoramic sequence set in S301 has been completed, and if not completed (i<J), the process proceeds to S312. Proceed as described above. If it is confirmed here that all OCT examinations have been completed (i≧J), the process advances to S313.

In S313, the test results of each partial region of the OCT panoramic test set in S301 are displayed, and a completion and retest selection screen is displayed.

In the next step S314, the selection of test completion and retest is made in response to the acceptance state of test completion and retest selection displayed together with the test results in S313. In this example, the display is displayed so that inspection completion and re-examination can be confirmed and selected at once for each partial area defined by the panoramic sequence, but of course the inspection results are displayed each time each inspection is completed. However, it is also possible to select completion of the inspection and re-examination. If the inspection has been successfully completed for all partial areas, the inspection is completed. If a certain defect is found in a certain OCT test (i=k), the examiner uses the input unit 340 such as a GUI to instruct a retest for that OCT test.

If reexamination is necessary, the imaging control unit 301 sets the counter value k of the OCT examination that requires reexamination to the counter (i=k) in S315, returns to S305, and executes reexamination. . This reexamination is repeated until the number of OCT examination counter values k that require reexamination becomes 0.
And then integrate.

As explained above, in the apparatus of Example 2, in an examination apparatus that automatically performs an examination sequence consisting of consecutive examinations, in addition to being able to reliably control the fixation index even between examinations, it is possible to Even if the patient loses sight of the fixation tag, the fixation target is immediately projected at a position that can be observed by the subject's eye, allowing for stable continuous testing.

In addition, in this embodiment, an OCT panoramic sequence was explained as an example of a continuous test, but the same applies when executing a test sequence in which different predetermined parts are sequentially tested, such as a macular test and a nipple test. Needless to say, the following processing is applicable. In such cases, it may be possible to select the order of multiple tests, the number of tests, etc., or to allow the examiner to define a test sequence that defines a series of control procedures to perform continuous tests on multiple test sites. , may be saved in the storage unit 302, or at the end of each of a plurality of examinations, a confirmation screen for the completion of the examination or a re-examination instruction, which will be described later, may be displayed on the display unit 310 to select the examination. You can also do it. In such an examination sequence, it is assumed that there may be a case where a part distant from an adjacent area is examined as in an OCT panoramic sequence, so that the movement distance and movement time of the fixation target between examinations become longer. Therefore, the present invention can exhibit more significant effects.

[Variation example of Example 2]
In addition, the present invention can also be applied to a device that performs continuous testing on left and right eyes as test objects, and has remarkable effects. In the modified example apparatus having such a test sequence in which the left and right eyes are switched and tested, after the control unit 300 determines in S311 that the test for one eye is completed, the test is performed in S205 in order to start the test for the other eye from S306. In this step, the left and right eye positions of the optical head unit 100 are switched, and an automatic alignment loop is started from the initial position for clear vision. Therefore, it is expected that there will be a considerable probability that the subject will not be able to observe the final fixation target Tei of the test at the start of this loop. In such a case, the fixation target control unit 3010 may determine the initial fixation target Tsi using the procedure described in the first embodiment or its modification. In other words, the fixation target control unit detects a positional shift in the state where the other eye is set at the initial position, which is moved from the eye to be examined that has completed the test to the vicinity in front of the other eye, and the fixation target control unit changes the initial presentation position of the fixation target. Determine. Further, for example, when the test sequence includes a test that causes miosis, such as color photography using a fundus camera, it is desirable to use a test set that tests both eyes alternately in order to avoid the influence of miosis.

Although several embodiments have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, rewrites, changes, and combinations of embodiments can be made without departing from the gist of the invention. These embodiments and their modifications are not only within the scope and gist of the invention, but also within the scope of the invention described in the claims and its equivalents.

The disclosure of this embodiment includes the following configurations.

(Configuration 1)
an inspection optical head that tests the eye to be inspected by irradiating the eye to be inspected with inspection light;
an alignment unit that aligns the eye to be inspected and the inspection optical head;
a fixation target optical system provided in the examination optical head and configured to project a fixation target onto a predetermined presentation position of the fundus of the eye to be examined;
a fixation target control unit capable of changing the presentation position and/or size of the fixation target;
a positional deviation detection unit that detects a positional deviation between the eye to be examined and the inspection optical head;
An ophthalmological device having
The fixation target control unit,
The fixation target is controlled so that the projected light flux of the fixation target passes through the pupil of the eye to be examined based on the positional deviation detected by the positional deviation detection unit while the alignment unit is performing alignment. An ophthalmologic apparatus characterized in that the unit repeats determining the presentation position and/or size of the fixation target multiple times.

(Configuration 2)
The ophthalmologic apparatus further includes a drive control section that drives and controls the positioning section,
The ophthalmologic apparatus according to configuration 1, wherein the drive control section drives and controls the alignment mechanism according to the detected positional deviation amount.

(Configuration 3)
The ophthalmological device includes:
The fixation target control unit determines an initial presentation position and/or size of the fixation target based on a positional deviation in a state where the inspection optical head is set at an initial position before starting alignment. The ophthalmologic apparatus according to configuration 1 or configuration 2.

(Configuration 4)
The fixation target control unit includes:
When there is no presentation position of the fixation target where the projected light flux of the fixation tag passes through the pupil,
As the presentation position and/or size of the fixation target,
A fixation target presentation position closest to a virtual fixation target position passing through the pupil of the eye to be examined, and/or a fixation target presentation position and size including the closest fixation target presentation position are determined. The ophthalmologic apparatus according to any one of configurations 1 to 3.

(Configuration 5)
5. The ophthalmologic apparatus according to any one of configurations 1 to 4, further comprising a storage unit that stores an inspection sequence that defines continuous inspection of a plurality of inspection sites using the inspection optical head.

(Configuration 6)
When the fixation target control unit moves the fixation target in order to change from one test site to the next test site among the plurality of test sites to be examined in the continuous test, 5. The ophthalmological apparatus according to configuration 5, wherein the initial position of the fixation target in the examination is near the fixation target presentation position in the previous examination.

(Configuration 7)
7. The ophthalmologic apparatus according to configuration 5 or 6, wherein the plurality of inspection sites are areas adjacent to each other, and the ophthalmologic apparatus further includes an integrating section that integrates inspections in the adjacent areas.

(Configuration 8)
Structures 5 to 7, characterized in that the subject eyes to be tested in the continuous test include the left and right eyes, and the initial position is an initial position for the other eye moved from the subject eye after the test to a position in front of the other eye. The ophthalmological device according to any one of the above.

(Configuration 9)
9. The ophthalmologic apparatus according to any one of configurations 1 to 8, wherein the position determined by the fixation target control unit is closer to the predetermined position as the positional deviation is smaller.

(Configuration 10)
According to any one of configurations 1 to 9, the size of the fixation target determined by the fixation target control unit is such that the smaller the positional shift is, the smaller the fixation target is presented. Ophthalmology equipment.

(Configuration 11)
The fixation target control unit includes:
Any one of configurations 1 to 10, characterized in that when the positional deviation detected by the positional deviation detection unit falls within a predetermined range, the predetermined presentation position is determined as the presentation position of the fixation target. The ophthalmological device described in .

(Configuration 12)
When the fixation target is presented at the predetermined presentation position while repeating the positional deviation detection by the positional deviation detection unit and the determination of the presentation position and/or size of the fixation target by the fixation target control unit a plurality of times; If it is determined that the projected light flux of the fixation target passes through the pupil of the eye to be examined, the fixation target control unit determines the predetermined presentation position as the presentation position of the fixation target. The ophthalmologic apparatus according to any one of configurations 1 to 11.

100 Optical head (inspection optical head)
101 Objective lens 131 Hole mirror 132 Photographic aperture 133 Focus lens 134 Imaging lens 137 LED array 200 Spectrometer 300 Control section 340 Input section 310 Display section 350 Audio output section 410 Observable range 420 Element selection range

Claims (12)

an examination optical head that tests the eye to be examined by irradiating the eye to be examined with test light;
an alignment unit that aligns the eye to be inspected and the inspection optical head;
a fixation target optical system provided in the examination optical head and configured to project a fixation target onto a predetermined presentation position of the fundus of the eye to be examined;
a fixation target control unit capable of changing the presentation position and/or size of the fixation target;
a positional deviation detection unit that detects a positional deviation between the eye to be examined and the inspection optical head;
An ophthalmological device having
The fixation target control unit,
The fixation target is controlled so that the projected light flux of the fixation target passes through the pupil of the eye to be examined based on the positional deviation detected by the positional deviation detection unit while the alignment unit is performing alignment. An ophthalmologic apparatus characterized in that the unit repeats determining the presentation position and/or size of the fixation target multiple times. further comprising a drive control section that drives and controls the alignment section,
The ophthalmologic apparatus according to claim 1, wherein the drive control section drives and controls the positioning section according to the detected positional deviation amount. The fixation target control unit determines an initial presentation position and/or size of the fixation target based on a positional deviation in a state where the inspection optical head is set at an initial position before starting alignment. The ophthalmological device according to claim 1, characterized in that: The fixation target control unit includes:
When there is no presentation position of the fixation target where the projected light flux of the fixation tag passes through the pupil,
As the presentation position and/or size of the fixation target,
A fixation target presentation position closest to a virtual fixation target position passing through the pupil of the eye to be examined, and/or a fixation target presentation position and size including the closest fixation target presentation position are determined. The ophthalmological device according to claim 1. The ophthalmologic apparatus according to any one of claims 1 to 4, further comprising a storage unit that stores an inspection sequence that defines continuous inspection of a plurality of inspection sites by the inspection optical head. When the fixation target control unit moves the fixation target in order to change from one test site to the next test site among the plurality of test sites to be examined in the continuous test, 6. The ophthalmologic apparatus according to claim 5, wherein the initial position of the fixation target in the examination is near the fixation target presentation position in the previous examination. 6. The ophthalmologic apparatus according to claim 5, wherein the plurality of inspection sites are areas adjacent to each other, and further comprising an integrating section that integrates inspections in the adjacent areas. 6. The eyes to be examined to be examined in the continuous examination include the left and right eyes, and the initial position is an initial position for the other eye moved from the eye to be examined after the examination to the vicinity in front of the other eye. ophthalmological equipment. The ophthalmologic apparatus according to claim 1, wherein the position determined by the fixation target control unit is closer to the predetermined position as the positional deviation is smaller. The ophthalmologic apparatus according to claim 1, wherein the size of the fixation target determined by the fixation target control unit is such that the smaller the positional shift, the smaller the fixation target. The fixation target control unit includes:
The ophthalmological apparatus according to claim 1, wherein when the positional deviation detected by the positional deviation detection unit falls within a predetermined range, the predetermined presentation position is determined as the presentation position of the fixation target. . When the fixation target is presented at the predetermined presentation position while repeating the positional deviation detection by the positional deviation detection unit and the determination of the presentation position and/or size of the fixation target by the fixation target control unit a plurality of times; If it is determined that the projected light flux of the fixation target passes through the pupil of the eye to be examined, the fixation target control unit determines the predetermined presentation position as the presentation position of the fixation target. The ophthalmological device according to claim 1.

Images