JP4481420B2 - Ophthalmic examination equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ophthalmic examination apparatus using ophthalmic equipment performed in an ophthalmic clinic or the like.
[0002]
[Prior art]
Conventionally, in an ophthalmologic examination apparatus, the eye to be examined is observed, and the examination unit of the apparatus and the eye to be examined are aligned to obtain specific information of the eye to be examined such as eye refractive power, fundus image, and fundus blood flow. .
[0003]
In these ophthalmologic examination apparatuses, when performing alignment between the examination part of the apparatus and the eye to be examined, the examiner operates the operation means while observing the anterior eye part image of the eye to be examined displayed on the TV monitor, For coarse alignment of the position of the examination unit and the eye to be examined, and when a corneal reflection image of the index light beam projected on the cornea of the eye to be examined appears, it is for alignment displayed around the optical axis of the display unit such as a TV monitor Positioning is performed by operating the operation means so that the cornea reflection image coincides with the mark. Alternatively, alignment is performed by operating the operating means so that the eye pupil to be examined matches the alignment mark displayed around the optical axis of the display unit such as a television monitor.
[0004]
However, in recent years, an alignment index is projected onto the cornea of the eye to be examined, and the reflection index image is detected photoelectrically so that the corneal reflection index image and the optical axis of the apparatus measurement unit coincide with each other. There has been proposed an ophthalmic examination apparatus that automatically aligns the eye to be examined and the apparatus by controlling driving means that can be driven in three axial directions to which the apparatus measuring unit is fixed.
[0005]
Further, although it varies depending on individual differences or pathological factors, it is known that in most human eyes, the apex of the cornea is decentered with respect to the center of the pupil.
[0006]
[Problems to be solved by the invention]
However, in the conventional example described above, the corneal reflection index image of the eye to be examined is detected photoelectrically, and the driving means is controlled so that the corneal reflection index image coincides with the optical axis of the apparatus measurement unit. In an ophthalmologic examination apparatus that performs registration, the eye and the eye of the subject in which the center of the pupil and the cornea of the eye are decentered are aligned with the optical axis when the device and the eye are aligned at the center of the corneal reflection index image. On the other hand, the pupil is decentered, the luminous flux necessary for measuring the unique information of the eye to be examined is displaced by the pupil, and there is a problem that the measurement becomes unstable.
[0007]
In addition, the light beam necessary for measuring the specific information of the eye to be examined is photoelectrically detected so that the pupil is not displaced by the pupil, and the optical axis of the eye to be examined is coincident with the optical axis of the device measurement unit. In an ophthalmologic examination apparatus that automatically performs alignment by controlling the driving means, the pupil diameter changes depending on the eye to be examined, etc., so that the pupil center can be detected photoelectrically. Complicated processing is required, and it takes a long time to detect the center of the pupil, which hinders measurement.
[0008]
An object of the present invention is to solve the above-mentioned problems, and can quickly and automatically align the apparatus and the eye to be examined even in the eye to be examined in which the pupil center and the cornea center are eccentric. An object of the present invention is to provide an ophthalmic examination apparatus capable of performing stable measurement without the luminous flux necessary for measuring the specific information of the optometry being displaced by the pupil.
[0009]
[Means for Solving the Problems]
To achieve the above object, an ophthalmic examination apparatus according to the present invention includes a measuring means for measuring an eye to be examined, an index projecting means for projecting an index light beam on the cornea of the eye to be examined, and a pupil for detecting a pupil center position of the eye to be examined. Center position detection means, corneal reflection index image position detection means for detecting the position of the corneal reflection index image from the reflected light beam from the cornea of the light beam projected from the index projection means, and the index light beam is projected onto the cornea of the measurement means and the eye to be examined and drive means for moving the apparatus optical unit including the said index projection means and the pupil center position detecting means and the corneal reflection index image position detecting means for the detected pupil center position by said pupil center position detecting means setting a region in which the optical axis is centered on the position of the corneal reflection index image detected by the corneal reflection index image position detecting means when in the preset allowable area of the measuring means , And having a control means subject's eye is to control the driving means so as corneal reflection index image enters said region when the fogging conditions, the.
[0010]
Further, ophthalmologic examination apparatus according to the present invention comprises a measuring means for measuring a subject's eye, a target projecting means for projecting an index light beam onto the cornea of the eye, the pupil center position detecting means for detecting the pupil center position of the eye A corneal reflection index image position detecting means for detecting a corneal reflection index image position from a reflected light beam by the cornea of a light beam projected from the index projecting means, the measuring means, the index projecting means, the pupil center position detecting means, and the cornea and drive means for moving the apparatus optical unit including a reflective index image position detecting means, the allowable area in which the optical axis is set in advance of the measurement means and the detected pupil center position by said pupil center position detecting means set the region around the position of the corneal vertex to be determined from the position of the corneal reflection index image detected by the corneal reflection index image position detecting means when there, the subject's eye of fogging state Kino the corneal apex and having a control means for controlling said drive means to enter the area.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 is a block diagram of the first embodiment. A dichroic mirror 1 is disposed to face the eye E, and an anterior ocular segment observation objective lens 2 and a dichroic mirror 3 are disposed in the reflection direction thereof, and the dichroic is disposed on the optical path O1 in the reflection direction of the dichroic mirror 3. A mirror 4 and an imaging lens 5 are provided, and an image sensor 6 such as a CCD camera is disposed at a position substantially conjugate with the vicinity of the anterior eye portion of the eye E to be examined. In addition, an anterior ocular segment illumination light source 7 such as an LED that emits near-infrared light for illuminating the anterior segment of the eye E is disposed at a position off the optical axis between the eye E and the dichroic mirror 1. . The anterior ocular segment observation optical system is constituted by the anterior ocular segment observation objective lens 2 to the image sensor 6.
[0012]
Further, in the reflection direction of the dichroic mirror 4, an imaging element 9 such as a CCD camera is disposed at a position substantially conjugate with the imaging lens 8 and the vicinity of the anterior eye part. A corneal reflection index image imaging optical system is configured by the anterior ocular segment observation objective lens 2 to the imaging element 9.
[0013]
A mirror 10 is arranged on the optical path O2 in the transmission direction of the dichroic mirror 3, and a fixation target projection system for fixing the eye E to be examined (not shown) is arranged in the reflection direction of the mirror 10. On the other hand, on the optical path O3 in the transmission direction of the dichroic mirror 1, an eye refractive power measurement objective lens 11, a beam splitter 12, such as a half mirror, a perforated mirror 13, a projection aperture 14, a projection lens 15, an index plate 16, and a front An eye refractive power measurement light source 17 that emits near-infrared light having a wavelength that is several tens of nanometers longer than that of the eye illumination light source 7 is disposed. These eye refractive power measurement objective lenses 11 to eye refractive power measurement light source 17 constitute an eye refractive power measurement light projection optical system.
[0014]
In addition, a six-hole aperture 18 having six openings outside the optical axis is disposed in the reflection direction of the perforated mirror 13, and an imaging element 21 such as a six-divided prism 19, a relay lens 20, and a CCD camera is disposed behind the aperture. Has been placed. These eye refractive power measurement objective lenses 11 to imaging device 21 constitute an eye refractive power measurement light receiving optical system.
[0015]
Further, on the optical axis in the reflection direction of the beam splitter 12, a corneal index projection lens 21, a corneal index 22, and a corneal index light source 23 that emits near-infrared light, such as an LED, are disposed. The measurement objective lens 11, the beam splitter 12, and the corneal index light source 23 constitute a corneal index projection optical system.
[0016]
Here, the dichroic mirror 1 transmits most of the light of the wavelength emitted from the eye refractive power measurement light source 17 and the corneal marker light source 23 and reflects a part of the light, and emits the light of the wavelength emitted from the anterior segment illumination light source 7. The dichroic mirror 3 has a property of reflecting visible light and reflecting near-infrared light. The dichroic mirror 4 has a characteristic of reflecting light having a wavelength emitted from the eye refractive power measurement light source 17 and the corneal marker light source 23 and transmitting light having a wavelength emitted from the anterior segment illumination light source 7. .
[0017]
In addition, the anterior ocular segment observation optical system, corneal reflection index image imaging optical system, fixation target projection optical system, eye refractive power measurement light projection optical system, eye refractive power measurement light receiving optical system, corneal index projection optical system, etc. An eye examination unit to be examined is configured, and this eye examination unit is placed on a gantry that can move in three axial directions, and the gantry can be moved electrically by driving means 31 such as a motor. ing.
[0018]
The image sensor 6, the image sensor 9, and the image sensor 21 are connected to an A / D converter 32, an A / D converter 33, and an A / D converter 34, respectively, and outputs thereof are an image memory 35, an image memory 36, and an image memory 35, respectively. In addition to being connected to the image memory 37, it is also connected to an arithmetic processing unit 38 that performs all control of the apparatus. In addition to this, a signal input means 39 in which an eye refractive power measurement light source 17, a corneal index light source 23, a measurement start switch, a switch for operating a drive means, and the like are arranged is connected to the arithmetic processing unit 38. Further, a D / A converter 40, a television monitor 41, and driving means 31 are connected to the arithmetic processing unit 38.
[0019]
FIG. 2 is a flowchart showing the operation of this embodiment. First, when the examiner presses a measurement start switch provided in the signal input means 39, the apparatus starts a measurement operation. Then, the eye E is illuminated by the anterior segment illumination light source 7, and the reflected scattered light from the vicinity of the anterior segment by the anterior segment illumination light source 7 of the subject eye E is reflected by the dichroic mirror 1. The lens 2 makes substantially parallel light, reflects off the dichroic mirror 3, passes through the dichroic mirror 4, and forms an image on the image sensor 6 through the imaging lens 5.
[0020]
The output signal of the image sensor 6 is converted into a digital signal by the A / D converter 32, and the anterior segment image E ′ is projected on the television monitor 41 via the arithmetic processing unit 38 and the D / A converter 40. At the same time, when the anterior segment image data converted into the digital signal is stored in the image memory 35, the arithmetic processing unit 38 extracts the pupil of the eye E from the stored anterior segment image data, and the center of the pupil Detect position. In this pupil center position detection method, for example, when the anterior segment is sufficiently illuminated, the brightness of the anterior segment image E ′ is darkest in the pupil, and becomes brighter in the order of the iris and sclera. By performing the conversion process, the boundary of the pupil can be obtained, and thereby the center position of the pupil can be calculated.
[0021]
When the pupil center position is detected, the arithmetic processing unit 38 calculates a deviation amount in a plane perpendicular to the optical axis between the optical axis of the eye examination unit and the pupil center position, and driving means so that they match. 31 is controlled. When the first detection and driving of the pupil center position are completed, the arithmetic processing unit 38 again detects the pupil center position, and determines whether or not the deviation amount from the apparatus measurement optical axis is within a predetermined allowable region.
[0022]
If it is not within the permissible region, the driving means 31 is controlled so that the optical axis of the eye examination unit and the optical axis of the pupil center coincide with each other, and the deviation amount between the pupil central position and the apparatus measurement optical axis is again detected. It is determined whether it is within this allowable area.
[0023]
If it is determined that it is within this allowable region, the arithmetic processing unit 38 immediately turns on the corneal marker light source 23. Then, the luminous flux emitted from the corneal index light source 23 illuminates the corneal index 22, and the corneal index luminous flux that has passed through the light transmitting portion of the corneal index 22 is temporarily reflected by the corneal index projection lens 21 and the beam splitter 12. An image of the corneal index 22 is formed in front of the lens 11 and is made into substantially parallel light by the objective lens 11, most of which passes through the dichroic mirror 1 and reaches the eye E to be examined.
[0024]
The light beam reflected by the cornea Ec of the eye E forms a reflected image of the reflected light beam at the midpoint of the center of corneal curvature and the apex of the cornea, and a part of the light beam is reflected by the dichroic mirror 1, The observation objective lens 2 makes substantially parallel light, is deflected to the optical path O1 by the dichroic mirror 3, is reflected by the dichroic mirror 4, reaches the imaging element 9 by the imaging lens 8, and is captured as an image including a corneal reflection index image. And digitized by the A / D converter 33 and stored in the image memory 36.
[0025]
At the same time, the arithmetic processing unit 38 extracts the corneal reflection index image from the image data including the corneal reflection index image stored in the image memory 36, obtains the corneal reflection index image position, and centers on the position of the obtained corneal reflection index image. An alignment allowable region having a predetermined area is set. The predetermined area of the alignment permissible region is set by obtaining in advance a range in which a stable measurement value can be obtained when measuring unique information of the eye to be examined. Further, the alignment allowable area may be displayed on a display means such as a monitor.
[0026]
Next, the fixation target projection optical system is controlled to promote clouding of the eye E by a known method. In order to perform a more accurate refractive power measurement of the eye E, it is necessary to move away the fixation target step by step to promote cloud fogging, and it also takes several seconds to adjust the eye E. Therefore, as described above, the center position of the subject's eye pupil is detected, the pupil center position is matched with the apparatus measurement optical axis, the corneal reflection index image position is detected almost simultaneously, and the alignment centered on the corneal reflection index image position is performed. When clouding of the eye E is promoted after setting the allowable region, the corneal reflection index image may deviate from the alignment allowable region set by the eye movement of the eye E or the like. In other words, this means that the amount of deviation between the center of the subject's eye pupil and the apparatus measurement optical axis exceeds the allowable measurement range.
[0027]
Subsequently, when the eye E is in a cloudy state, the arithmetic processing unit 38 detects the corneal reflection index image position, and determines whether or not the corneal reflection index image is within the already set alignment allowable region. When the corneal reflection index image is not within the alignment allowable area, the driving unit 31 is controlled so that the corneal reflection index image falls within the alignment allowable area, the corneal reflection index image position is detected again, and the corneal reflection index image is detected. Is determined to be within the alignment allowable area that has already been set.
[0028]
When the corneal reflection index image is within the alignment allowable region, the eye refractive power, which is unique information of the eye E, is measured by a known method. In the present embodiment, an arbitrary number of measurements can be set by a measurement number setting switch provided in the signal input means 39. Here, for example, if N measurement times are set, the arithmetic processing unit 38 detects the corneal reflection index image position again when the first measurement is completed, and the corneal reflection index image is already set. It is determined whether or not it is within the alignment allowable region. If it is not within the alignment allowable region, the driving means 31 is controlled. If the corneal reflection index image is within the alignment allowable region, the next eye refractive power is determined. Measure.
[0029]
Then, when the N-th measurement is completed, the measurement operation is stopped, the driving means 31 is controlled by a predetermined amount in order to measure one eye that has not yet been measured, and an anterior eye image of one eye that has not yet been measured is observed in the anterior eye portion. When an image is captured by the optical system, the pupil center position of one eye that has not yet been measured is detected, and the measurement operation is started. Thereafter, the above-described operation is performed until the number of measurements reaches N. When the N-th measurement is completed, the measurement results are displayed on the display means 33 such as a monitor, and the measurement results are output to a printing means such as a printer (not shown). End the measurement operation.
[0030]
As described in the conventional example, the center of the pupil of the human eye and the apex of the cornea do not always coincide with each other, but rather are more eccentric. Accordingly, in the eye E having a large eccentricity of the corneal apex with respect to the center of the pupil, if the alignment with the apparatus measurement optical axis is performed with respect to the corneal apex reference, the light flux necessary for measuring the information specific to the eye is caused by the pupil. There is a risk of being killed.
[0031]
However, in this embodiment, even in such an eye to be examined, the center position of the pupil is detected and the driving means 31 is controlled so that the center position of the pupil substantially coincides with the measurement optical axis. Since the image position is detected, the alignment allowable region is set around the position of the corneal reflection index image, and the driving means 31 is controlled so that the corneal reflection index image within the alignment allowable region is entered. The center and the measurement optical axis coincide with each other, so that the light beam necessary for measurement is not lost by the pupil.
[0032]
Compared to detecting the center position of the pupil, detecting the corneal reflection index image position requires a smaller memory area and can be detected in a shorter time, thus reducing the time required for alignment and reducing the burden on the subject. it can.
[0033]
In this embodiment, the eye refractive power measurement light source 17 and the corneal index light source 23 are provided separately, but the dichroic mirror 10, the corneal index projection lens 21, the corneal index 22, and the corneal index light source 23 are removed, and the eye The light beam from the refractive power measurement light source 17 may be used as the corneal index light beam. In this way, the apparatus can be simplified and downsized.
[0034]
Furthermore, although the light source is arranged on the optical axis in this embodiment, a plurality of light sources are arranged off-axis symmetrically to the optical axis, and a plurality of corneal reflection light source images (index images) from the plurality of light sources are detected, and the corneal reflection is detected. The same effect can be obtained by controlling the driving means 31 so that the light source image (index image) is symmetric with respect to the measurement optical axis.
[0035]
FIG. 3 is a block diagram of the second embodiment. The same reference numerals as those in FIG. 1 represent the same members. In the first embodiment, a corneal index for alignment is projected from substantially on the optical axis toward the cornea Ec of the eye E by the objective lens 11 for measuring eye refractive power, the beam splitter 12, and the corneal index light source 23. In this second embodiment, the corneal index light source 41, 42 such as an LED or the like symmetrically with respect to the optical axis from outside the optical axis behind the eye refractive power measuring objective lens 11 is configured. Is arranged. The corneal index light sources 41 and 42 and the eye refractive power measurement objective lens 11 constitute a corneal index projection optical system for projecting a corneal index for alignment.
[0036]
On the optical axis O1, as shown in FIG. 4, an aperture plate 43 having two symmetrical openings 43a and 43b and an opening 43c on the optical axis is disposed outside the optical axis. The deflection prisms 44a and 44b are in close contact with the openings 43a and 43b, respectively. The corneal index light sources 41 and 42 are different from the wavelength of light emitted from the anterior segment illumination light source 7 and emit light having the same wavelength as that emitted by the eye refractive power measurement light source 17, and the openings 43a and 43b are eye refractive power measurement light sources. 17 and the corneal index light sources 41 and 42 are transmitted only, and the deflection prism 44a deflects the light beam toward the back of the paper and the deflection prism 44b deflects the light toward the front of the paper. .
[0037]
The alignment between the eye E to be examined and the optical unit of the apparatus will be described. In FIGS. 5 to 7, the light beam emitted from the corneal index light source 42 is projected onto the cornea Ec by the objective lens 11 for measuring eye refractive power and reflected by the cornea Ec. After the light beam passes through the dichroic mirror 1, the anterior ocular segment observation objective lens 2, and the dichroic mirror 3, it is divided and deflected by the deflecting prisms 44 a and 44 b and the diaphragm plate 43, and is formed on the image sensor 6 by the imaging lens 5. It is explanatory drawing of a mode that it has been guide | induced. 5 shows a case where the distance between the eye E to be examined and the apparatus is appropriate, FIG. 6 shows a case where it is too close, and FIG. 7 shows a case where it is too far.
[0038]
The light beam Lc is a light beam restricted by the opening 43c, the light beam La is restricted by the opening 43a, the light beam deflected toward the back of the paper by the deflection prism 44a, and the light beam Lb is restricted by the opening 43b, and is deflected by the deflection prism 44b. It is a light beam deflected toward the front of the page.
[0039]
8 to 10 show the anterior segment image E ′ displayed on the television monitor 41 after alignment with the pupil center position, and P1, P2, and P3 are the aperture plate 43 of the corneal index light source 41, respectively. The images are divided by the openings 43a, 43b, and 43c, and Q1, Q2, and Q3 are images divided by the openings 43a, 43b, and 43c of the diaphragm plate 43 of the corneal index light source 42, respectively. 8 shows a case where the distance between the eye E to be examined and the apparatus is appropriate, FIG. 9 shows a case where it is too close, and FIG. 10 shows a case where it is too far.
[0040]
As described above, in the second embodiment, the positions of the corneal index light source images P1, P2, P3 and Q1, Q2, Q3 reflected by the cornea Ec are detected, and the driving means 31 is controlled so that an appropriate coverage is obtained. It is possible to align the distance between the optometry E and the apparatus. Furthermore, since the corneal index light sources 41 and 42 are arranged symmetrically with respect to the measurement optical axis, the positions of the corneal index light source images P3 and Q3 reflected by the cornea Ec are detected, and the midpoint is obtained by obtaining the midpoint thereof. The vertex position can be obtained.
[0041]
Then, in the same manner as in the first embodiment, an alignment allowable area is set around the obtained corneal apex position, and it is determined whether or not the corneal apex position is within the set alignment allowable area. If it is determined that there is no corneal apex position in the region, the driving means 31 is controlled to obtain the corneal apex position again, and it is determined whether or not the region is within the alignment allowable region. When it is determined that the corneal apex position is within the alignment allowable region, the eye refractive power is measured.
[0042]
In this way, the corneal index light source is arranged symmetrically with respect to the measurement optical axis, the reflected light beam from the cornea from the light source is divided into a plurality of parts, and the prism for deflecting the divided light beam is provided to detect the corneal vertex of the eye to be examined. The distance between the eye to be examined and the device can be set to an appropriate distance, and the corneal apex can be obtained from the obtained plurality of corneal index images.
[0043]
【The invention's effect】
As described above, the ophthalmic examination apparatus according to the present invention detects the pupil center position of the subject's eye even in the subject's eye having a large eccentricity of the corneal apex with respect to the pupil center, and controls the driving means to control the pupil center position and the measurement optical axis. Are detected at the same time, and the position of the corneal reflection index image near the corneal apex is detected, and an allowable alignment area is set around the corneal reflection index image position, and the corneal reflection index image is within the alignment allowable area. Since the driving means is controlled so as to enter, the center of the pupil of the eye to be examined and the measurement optical axis coincide with each other, so that the light beam necessary for measurement is not displaced by the pupil.
[0044]
In addition, since the memory area to be scanned is smaller and can be detected in a shorter time when the position of the corneal reflection index image is detected than when the pupil center position is detected, the alignment time can be shortened and the burden on the subject can be reduced.
[0045]
Furthermore, by detecting the pupil center and aligning it with the pupil center, the corneal index light source is turned on, so that the reflected light from the corneal index light does not adversely affect the pupil detection when the pupil center position is detected.
[0046]
Further, by sharing the eye refractive power measurement light source and the corneal marker light source, the apparatus can be simplified and miniaturized.
[0047]
Then, a plurality of light sources are arranged symmetrically about the optical axis outside the measurement optical axis, a plurality of corneal reflection light source images (index images) from the plurality of light sources are detected, and the corneal reflection light source image (index image) is measured by the measurement optical axis. If the positioning is performed by controlling the driving means so as to be symmetrical, the detection range of the corneal reflection index image can be widened.
[0048]
Furthermore, the reflected light from the cornea from the corneal index light source is divided into a plurality of parts, and a prism for deflecting the divided light beams is provided so that the corneal apex of the eye to be examined can be detected, and the distance between the eye to be examined and the apparatus is set to an appropriate distance. be able to.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a first embodiment.
FIG. 2 is a flowchart.
FIG. 3 is a configuration diagram of a second embodiment.
FIG. 4 is a front view of a diaphragm plate.
FIG. 5 is an explanatory diagram of a corneal reflection index light beam when the distance is appropriate.
FIG. 6 is an explanatory diagram of a corneal reflection index light beam when it is too close.
FIG. 7 is an explanatory diagram of a corneal reflection index light beam when it is too far.
FIG. 8 is an explanatory diagram of an anterior segment image displayed on a television monitor when the distance is appropriate.
FIG. 9 is an explanatory diagram of an anterior segment image displayed on a television monitor when the distance is too close.
FIG. 10 is an explanatory diagram of an anterior segment image displayed on a television monitor when the distance is too far.
[Explanation of symbols]
1, 3, 4 Dichroic mirror 2 Anterior eye observation objective lenses 6, 9, 21 Imaging device 7 Anterior eye illumination light source 11 Eye refractive power measurement objective lenses 16, 22 Indicator plate 17 Eye refractive power measurement light source 23 Corneal index Light source 31 Driving means 33 Television monitor 38 Arithmetic processing section 39 Signal input means 41, 42 Corneal index light sources 44a, 44b Deflection prism

Claims (5)

Measuring means for measuring the eye to be examined ;
Index projection means for projecting an index beam onto the cornea of the eye to be examined; and
Pupil center position detecting means for detecting the pupil center position of the eye to be examined;
Corneal reflection index image position detection means for detecting a corneal reflection index image position from a reflected light beam by the cornea of the light beam projected from the index projection means;
Driving means for moving the apparatus optical unit including the measurement means, the index projection means for projecting the index light beam onto the cornea of the eye to be examined, the pupil center position detection means, and the corneal reflection index image position detection means ;
Of the cornea reflected target image and the optical axis is detected by the corneal reflection index image position detecting means when in the preset allowable area of the pupil center position detected by the detection means the pupil center position and the measuring means An ophthalmic examination apparatus comprising: a control unit configured to set a region centered on a position and control the driving unit so that a corneal reflection index image when the subject's eye is in a cloudy state enters the region. . Measuring means for measuring the eye to be examined ;
Index projection means for projecting an index beam onto the cornea of the eye to be examined; and
Pupil center position detecting means for detecting the pupil center position of the eye to be examined;
Corneal reflection index image position detection means for detecting a corneal reflection index image position from a reflected light beam by the cornea of the light beam projected from the index projection means;
Driving means for moving an apparatus optical unit including the measurement means, the index projection means, the pupil center position detection means, and the corneal reflection index image position detection means ;
Of the cornea reflected target image and the optical axis is detected by the corneal reflection index image position detecting means when in the preset allowable area of the pupil center position detected by the detection means the pupil center position and the measuring means A control means for setting an area centered on the position of the corneal apex obtained from the position and controlling the driving means so that the corneal apex when the subject's eye is in a cloudy state enters the area. A characteristic ophthalmic examination device . The ophthalmic examination apparatus according to claim 1, further comprising: an imaging unit that captures an anterior ocular segment image of the eye to be examined; and a display unit that displays the region together with the anterior segment image. The ophthalmic examination apparatus according to claim 1, wherein the light source of the index projection unit uses the light source of the measurement unit. The ophthalmic examination apparatus according to claim 1, wherein the pupil position detection unit and the corneal reflection index image position detection unit use the same imaging unit.

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