JP4276039B2 - Ophthalmic measuring device - Google Patents

Description

  The present invention projects light into the eye to be examined, and receives the scattered light of the measurement target portion in the eye to be examined by the projected light, for example, biological characteristics such as the number of cells floating in the anterior chamber and protein concentration The present invention relates to an ophthalmologic measuring apparatus and a positioning method.

  As an ophthalmologic measuring apparatus, a flare meter and a flare cell meter are known. These ophthalmologic measuring devices measure the number of cells floating in the anterior chamber of the eye to be examined and the protein concentration (flare concentration).

  The ophthalmologic measurement device adopts a method in which light is projected into the subject's eye from an oblique direction with respect to the eyeball optical axis of the subject eye, and scattered light is received from the oblique direction on the opposite side of the eyeball optical axis from the projected light. (See Patent Documents 1 to 4).

  In these ophthalmologic measurement devices, in order to measure scattered light suitably, alignment (alignment) between the measurement unit of the ophthalmic measurement device that performs measurement and the eye to be measured is performed before the measurement of actually measuring the scattered light. Is going.

  Alignment uses a slit light (visible light) that is vertically elongated as observation light to adjust the position of the measurement unit with respect to the subject's eye, or an image that is captured on a display image by taking a virtual image with a CCD. For example, a method of adjusting the position of the measurement unit with respect to the eye to be examined is performed.

Here, in the alignment using the slit light, the light amount of the slit light (observation light) can be manually adjusted arbitrarily by the examiner so that the anterior eye part of the eye to be examined can be easily seen. Further, even with alignment using an image on a display monitor, observation with visible light is necessary in order to accurately confirm position matching, and the amount of observation light is required to be greater than a certain level. That is, the observation light is indispensable for any alignment method.
Japanese Patent Laid-Open No. 3-264044 JP-A-6-217939 Japanese Patent Laid-Open No. 7-178052 Japanese Patent Laid-Open No. 9-84763

  The observation light indispensable at the time of conventional alignment is projected onto the anterior segment of the eye to be examined. For this reason, if scattered light, reflected light, etc. due to observation light whose amount of light is greater than a certain amount is received by the light receiving optical system, the measured value measured in the preliminary measurement to determine the quality of the alignment before measurement And the background value (BG) is increased.

  Depending on the condition of the eye to be examined, BG is too high in the temporary measurement, and it is determined that the error is caused by insufficient alignment. In this case, the ophthalmic measurement apparatus is not switched from the alignment mode to the measurement mode, and measurement is impossible. In particular, in the eye to be examined of a patient with cataract, BG is likely to be high due to temporary measurement, and measurement is likely to be impossible.

  The present invention has been made in view of the above prior art, and an object of the present invention is to provide an ophthalmologic measurement apparatus and an alignment method that are easy to measure and eliminate the adverse effects of observation light.

In the ophthalmologic measurement apparatus according to the present invention, the living body characteristic in the eye to be examined is measured by projecting light into the eye to be examined and receiving the scattered light, and the projection optical system, the light receiving optical system, and the observation light projecting means. The projection optical system projects projection light obliquely with respect to the eyeball optical axis of the eye to be examined from the projection light source into the eye to be examined, and the light receiving optical system is The projection light of the projection optical system receives scattered light scattered by the measurement target portion in the eye to be examined, and the observation light projection means sends the observation light to the eye to be examined when aligning the measurement unit and the eye to be examined before measurement. The alignment between the measurement unit and the eye to be examined is
While the examiner aligning the measurement unit to the subject's eye, a first step of projecting the observation light, after the first stage, the projection Shako science while projecting less observation light amount than the first stage The second stage of projecting the projection light from the system and determining the quality of the alignment by the scattered light received by the light receiving optical system is performed separately, and the determination of the quality of the alignment in the second stage is as follows: The amount of light immediately before and after the scattered light scans the measurement target portion is detected, and the uniformity of the amount of light at the time immediately before and immediately after is calculated, and the result is a result of the quality of the uniformity .

  When it is determined that the alignment is good in the second stage, it is preferable to stop the projection of the observation light onto the eye and start the measurement.

  The projection light and the observation light may have different wavelengths.

  The measurement unit is disposed on a pedestal that can move in the left and right directions with respect to the eye to be examined, and when the movement of the pedestal exceeds a predetermined amount per unit time, the measurement unit may transition to the first stage state. .

  The measurement unit is disposed on a pedestal that can move in the left and right directions with respect to the eye to be examined, and when the pedestal moves to a predetermined area or when the pedestal moves beyond a predetermined boundary, It is preferable to transition to a state.

  In the present invention, adverse effects caused by observation light can be eliminated and measurement can be facilitated.

  Embodiments of the present invention are illustratively described in detail below with reference to the drawings.

"overall structure"
FIG. 1 is a schematic configuration diagram of a laser flare meter (hereinafter referred to as LFM) according to an embodiment. 2 and 3 are external views of the LFM according to the embodiment.

  In the present embodiment, the description will be given by taking LFM as an example of an ophthalmic measurement apparatus. Note that the LFM of the present embodiment not only measures biological properties such as the number of cells (cells) floating in the normal anterior chamber of the eye to be examined and protein concentration (flare concentration), but also turbidity of the eye lens to be examined. The degree of biological properties can also be measured.

  In FIG. 1, an eye 1 to be examined, which is an eyeball of a subject, is shown, and an LFM measurement unit 2 is disposed facing the eye 1 to be examined.

  The LFM measuring section 2 generally includes a projection optical system 4 along the projection light optical axis 3 and a light reception optical system 6 along the light reception optical axis 5.

  In addition, the LFM measuring unit 2 includes one display unit 7 for performing various displays at one place, an analysis unit 8 for performing various data analysis, and an alignment determination unit 9 for determining the quality of alignment (alignment). And a switcher 10 for switching data to be displayed on the display unit 7.

  In the present embodiment, as shown in FIGS. 2 and 3, all the components built in the measurement unit 2 of the LFM are moved by the movement of the gantry 11 on which the measurement unit 2 is mounted. On the gantry 11, in addition to the measuring unit 2, a joystick 12 operated by the examiner for alignment, various buttons (not shown), and the like are arranged. On the upper part of the joystick 12, a start button 13 is provided for switching modes and performing measurement.

  Here, the eyeball optical axis L0 extends straight from the corneal apex of the subject eye 1 to the front. The eyeball optical axis L0 is shifted without overlapping the measurement target portion S that is the intersection of the projection light optical axis 3 and the light receiving optical axis 5.

  The projected light optical axis 3 and the received light optical axis 5 intersect at a predetermined position in the eye 1 to be examined, that is, in the anterior chamber of the eye 1 to form an intersection of both optical axes 3 and 5. The intersection position of the two optical axes 3 and 5 indicates the measurement target portion S. By intersecting in this way, the light receiving optical system 6 can receive the scattered light on the light receiving optical axis 5 in which the projection light from the projection optical system 4 is scattered by the measurement target portion S in the anterior chamber of the eye to be examined. .

  The angle at the intersection of the projection light optical axis 3 and the light receiving optical axis 5 is set to be a right angle so that the scattered light of the measurement object can be measured favorably. In other words, the light receiving optical axis 5 of the light receiving optical system 6 is arranged so as to receive the scattered light of the measuring object from a direction substantially perpendicular to the projection light optical axis 3 of the projection optical system 4, and the projection light optical axis. 3 and the light receiving optical axis 5 are perpendicular to the measurement target portion S in the eye 1 to be measured.

"Specific explanation of each component"
(Projection optical system)
The projection optical system 4 of the LFM measuring unit 2 will be described. In the projection optical system 4, laser light as projection light emitted from a laser light source 14 such as a visible laser diode passes through a condensing lens 15 along the projection optical axis 3 and the anterior chamber of the subject's eye 1. Projected into.

The condensing lens 15 is driven in a direction perpendicular to the projection light optical axis 3 and the paper surface by a driving unit (not shown), and scans the laser light minutely in a one-dimensional manner.

  As described above, since the scanning of the laser beam is performed by simply moving the condensing lens 15, the scanning can be realized with a simple configuration, and the cost can be reduced. In addition, when scanning laser light in multiple directions to measure the number of cells (cells) floating in the anterior chamber as a laser flare cell meter, it is only necessary to add another movable condensing lens, Improvement of the device is also simple.

  In addition, the projection optical system 4 includes an observation light source 16 that emits observation light, a slit 17 that defines the observation light as slit light, a shutter 18 that blocks the observation light at the time of measurement, and the observation light. And a half mirror 19 that aligns the optical path with the projected light optical axis 3. The observation light source 16, the slit 17, and the half mirror 19 constitute observation light projection means.

  When the observation light source 16 emits light and the observation light is projected, only the straight component (slit light) defined by the slit 17 proceeds to the projection optical system 4 in the observation light. Then, the observation light is reflected by the half mirror 19 on the projection light optical axis 3 so as to coincide with the projection light optical axis 3 toward the eye to be examined, and the observation light is guided to the eye 1 to be examined.

  Thereby, the measurement part external appearance of the to-be-tested eye 1 can be shown brightly with observation light. Then, the examiner can perform alignment while looking at the appearance of the measurement portion of the eye 1 indicated by the observation light.

  Further, the shutter 18 is closed, whereby the observation light is prevented from traveling to the half mirror 19, and the observation light is prevented from being projected into the eye 1 during measurement or the like.

  In addition, each light of the laser light source 14 and the observation light source 16 has a different wavelength so that the examiner can easily recognize which one is shown.

(Reception optical system)
Next, the light receiving optical system 6 will be described. The light receiving optical system 6 is a light receiving element that scatters scattered light in the measurement target portion S in the eye 1 to be examined by laser light from the laser light source 14 along a light receiving optical axis 5 through a lens 20 and a light receiving mask 21 as a light shielding member. Detection is performed by a photoelectric detector 22 such as a photomultiplier tube.

  The lens 20 is a spherical lens in which the optical axis of the lens 20 is inclined with respect to the light receiving optical axis 5. The lens 20 is used to remove large astigmatism that occurs when an image of scattered light that has passed through the cornea that generates large aberration is formed. Thereby, aberrations can be easily removed, and measurement accuracy can be improved.

  The light receiving mask 21 is used to limit the field of view in the direction of the light receiving optical axis L2 and to define the measurement range. The light receiving mask 21 is provided in a light receiving optical path along the light receiving optical axis 5 up to the photoelectric detector 22 and has an opening of a predetermined size at a position optically conjugate with the measurement target portion S. The light receiving mask 21 guides only the scattered light transmitted through the opening to the photoelectric detector 22.

  The photoelectric detector 22 receives only the scattered light limited by the light receiving mask 21, converts the received light intensity into an electrical signal, and outputs it as an output signal.

  The scattered light in the subject eye 1 is, for example, scattered light from proteins present in the anterior chamber of the subject eye 1, scattered light from floating cells (cells) in the anterior chamber, Or scattered light from the crystalline lens of the optometer 1.

  In the light receiving optical system 6, a shutter 23 is disposed between the lens 20 and the light receiving mask 21 for blocking scattered light when not measuring. By closing the shutter 23, scattered light and external disturbance light are prevented from being received by the photoelectric detector 22 during non-measurement.

  The output signal from the photoelectric detector 22 that has received the scattered light in the light receiving optical system 6 is supplied to the analysis unit 8. The analysis unit 8 calculates biological characteristics such as protein concentration from the output signal of the scattered light, and displays the measurement result on the display unit 7 based on the calculation.

  For example, for the calculation of biological characteristics, the analysis unit 8 analyzes an output signal digitized using a photon counting method. In the case of this photon counting method, a photocount value is used as the received light intensity. Each photocount value obtained by scanning with laser light is stored in the memory in the analysis unit 8 in time series.

  In addition, the light receiving optical system 6 includes a half mirror 24 for branching the optical path, a CCD camera 25 as second imaging means on the optical path branched by the half mirror 24, and a lens provided in front of the CCD camera 25. 26 are arranged.

  The half mirror 24 branches the scattered light or reflected light of the observation light from the light receiving optical axis 5, condenses the light branched by the half mirror 24 with the lens 26, and receives the collected image with the CCD camera 25. .

  Thereby, the measurement part appearance of the eye 1 to be inspected indicated by the observation light from the light receiving optical system 6 can be photographed by the CCD camera 25. Then, by displaying the output of the CCD camera 25 on the display unit 7, the examiner can enlarge and display the appearance of the measurement part appearance of the eye 1 to be examined on the display unit 7.

(Display section)
The display unit 7 displays (1) the measurement result from the analysis unit 8 at the time of measurement, and (2) the appearance of the measurement part appearance of the eye 1 to be examined from the CCD camera 25 at the time of alignment. That is, the two displays (1) and (2) are switched and displayed. The display is switched by the switch 10 under the control of the analysis unit 8.

  Since only one display unit 7 is provided and the display is switched as described above, the examiner only needs to observe the screen of the display unit 7 at all times. The operability for the examiner is improved.

(Analysis Department)
The analysis unit 8 is a part that performs information analysis and operation control. That is, processing such as analysis work and operation work is executed using a hardware configuration according to a program stored in advance. As a hardware configuration, for example, a general computer configuration can be adopted.

  The analysis unit 8 analyzes the output signal on the one hand, and on the other hand controls the switch 10 in accordance with the input of the examiner to switch the display target to be displayed on the display unit 7 and also displays the joystick of the examiner and the like. The drive motor is driven according to the input operation.

(Alignment discrimination unit)
The alignment determination unit 9 is a part that determines whether the alignment is good or bad. The computer configuration is the same as that of the analysis unit 8 and may be provided integrally with the analysis unit 8, but in the present embodiment, it is provided separately.

The alignment discriminating unit 9 has
Uniformity value = {2 × (BG1−BG2) × 100} / (BG1 + BG2)
Is stored.

  Then, when BG1 (background value immediately before the measurement scanning width) and BG2 (background value immediately after the measurement scanning width) are measured in the provisional measurement for determining the alignment quality at the time of alignment, Calculation is performed by substituting the measurement results of BG1 and BG2.

  In the calculation result, if the uniformity value is ± 15% or less, it is determined that the second stage of alignment is completely completed, and measurement is automatically executed. Further, if the uniformity value is greater than ± 15% and less than ± 20%, it is determined that the second stage of alignment is almost completed, and measurement can be started by pressing the start button 13 of the examiner. It has become.

"Measurement operation"
Next, the measurement operation using the LFM will be described. Measurement is divided into alignment before the start of measurement and execution of actual measurement. The outline of the measurement operation is a flowchart shown in FIG.

"alignment"
The case where the alignment which aligns the position of the measurement part of LFM and the eye 1 to be examined is performed is demonstrated. In the present embodiment, the alignment is performed by a first stage of alignment (S1) in which the examiner manually aligns using a joystick, and a second stage of alignment (S2) in which the quality of the manually performed alignment is determined. , Divided into two.

(First stage of alignment)
The first stage of alignment performed first will be described. The first stage is S1 in FIG. 4, where the examiner manually moves the LFM measurement unit 2 using a joystick, and aligns the measurement unit 2 with the eye 1 to be examined.

  The entire measurement unit 2 of the LFM moves by operating the joystick 12 together with the gantry 11 on which the measurement unit 2 is placed. By tilting the joystick 12, the measuring unit 2 moves to the left and right, and by rotating the joystick 12, the measuring unit 2 moves up and down.

  In the first stage, the examiner aligns the observation light, which has become slit light, near the center of the pupil of the eye 1 while viewing the anterior eye portion of the eye 1 with the naked eye. For this reason, in other words, in the first stage, the LFM projects observation light while the examiner aligns the measuring unit 2 with the eye 1 to be examined.

  The observation light here is projected with a predetermined amount of light, but can be manually increased or decreased according to the request of the examiner. In the first stage, laser light is not projected from the laser light source 14.

(Second stage of alignment)
When the observation light is in the vicinity of the pupil center of the eye 1 to be examined and the first stage of alignment is completed, the second stage of alignment, which is S2 in FIG.

  The transition from the first stage to the second stage is performed when the examiner determines that the first stage alignment has been completed and presses the start button 13 of the joystick 12.

In the second stage, when the amount of movement of the gantry in the first stage is less than a predetermined amount per unit time, it is determined that the position of the measurement unit has reached the eye to be examined, and automatically A transition from the first stage to the second stage may be provided. Further, in the second stage, when the image on the display unit 7 is the black one color of FIG. 5A at the start of the first stage, the measurement unit 2 is aligned with the eye 1 to be examined. As shown in FIG. 5B, the corneal reflection and the crystalline lens reflection of the observation light are reflected. Therefore, a change in the output signal of the CCD camera 25 output to the display unit 7 is detected, and the first stage to the second stage are automatically performed. You may provide so that it may change to.

  In the second stage, in order to determine the quality of the alignment before the measurement, projection light is projected, the shutter 23 of the light receiving optical system 6 is opened, and the photoelectric detector 22 can receive light so that the subject eye 1 One-dimensional high-speed scanning of the anterior segment of the eye (temporary measurement).

  Here, in the second stage, the observation light is uniformly set so as to be less adjustable than the first stage.

  Then, BG1 and BG2 are obtained by provisional measurement in which one-dimensional high-speed scanning is performed. BG1 is a background value immediately before the measurement scan width, and BG2 is a background value immediately after the measurement scan width.

  When BG1 and BG2 are obtained as a result of the provisional measurement, the values of BG1 and BG2 are substituted into the equation [uniformity value] = {2 × (BG1−BG2) × 100} / (BG1 + BG2). Since the expression of the uniformity value is stored in the alignment determination unit 9, the values of BG 1 and BG 2 are transmitted from the analysis unit 8 to the alignment determination unit 9, so that the alignment determination unit 9 performs the calculation.

  Based on the calculation result, it is determined whether or not the second stage is completed and the alignment is completed (S3). The determination is performed by the alignment determination unit 9. If the uniformity value is a calculation result of ± 15% or less, it is determined that the second stage of alignment is completely completed, and an instruction to perform measurement is sent to the analysis unit 8 to automatically execute measurement. If the uniformity value is greater than ± 15% and less than ± 20%, it is determined that the second stage of alignment is almost completed, and the analysis unit 8 performs measurement when the start button 13 is pressed. An instruction to perform the measurement is issued, and the execution of the measurement can be started by pressing the start button 13 of the examiner.

  In addition, in the second stage, minute alignment is performed while observing the appearance of the measurement part appearance of the eye 1 to be examined from the CCD camera 25 displayed on the display unit 7.

  As described above, in the second stage, the amount of the observation light to be projected is smaller than that in the first stage, so that the BG increases with the light quantity of the observation light at the time of temporary measurement for determining the alignment. The mode can be easily switched from the alignment mode to the measurement mode. In addition, it is possible to reduce disturbance light that does not require observation light during temporary measurement. Further, since the periphery of the eye 1 to be examined becomes dark at the time of temporary measurement and the pupil diameter of the eye 1 to be examined is larger, a wider measurement point candidate region can be secured.

“Perform Measurement”
After the alignment is completed by the above operation, the measurement is actually started in S4.

(Main measurement)
When the second stage of alignment is completed, that is, when the mode is switched from the alignment mode to the measurement mode, the laser light source 14 of the projection optical system 4 starts to irradiate and measurement is started.

Here, in this measurement, in other words, when the second stage of the alignment is completed, the observation light is prevented from traveling to the projection optical system 4 by closing the shutter 18 in front of the projection optical system 4. Alternatively, the observation light source 16 may be turned off and the observation light may be extinguished similarly.

  The irradiation start point of the laser light is set at an upper position (immediate position) exceeding the measurement scanning width of the eye 1 to be examined by scanning of the condensing lens 15, and the irradiation end point is detected by scanning of the condensing lens 15. It is set at a lower position (immediate position) beyond the measurement scanning width of the optometer 1. For this reason, the condensing lens 15 performs fine one-dimensional low-speed scanning, so that the laser light is scanned across the measurement scanning width from the upper side to the lower side of the eye 1 to be examined.

  Therefore, in the light receiving optical system 6, the scattered light in the subject eye 1 of the irradiated laser light is irradiated from the irradiation start position (above the subject eye) to the irradiation end position (below the subject eye) across the measurement scanning width. Detect in the range of. The portion other than the measurement scanning width is BG.

(Intensity of scattered light)
The intensity of the scattered light detected by the photoelectric detector 22 is as shown in the table of FIG. Here, in the table of FIG. 6, when the laser beam irradiation is started with the shutter 23 opened, the measurement time T1, the measurement start time T2, the measurement end time T3, and the time when the laser light irradiation is completed up to T4. The intensity of scattered light is shown in the series.

  In FIG. 6, regions A and C are light intensities (BG1, BG2) due to disturbance light on the upper and lower portions of the measurement target portion, which have been irradiated with laser light but have not yet been scanned. Region A is the background value BG1 immediately before the measurement scan width. Region C is the background value BG2 immediately after the measurement scan width.

  Region B is the light intensity during measurement (measurement scanning width) in which the laser beam is actually scanned over the portion to be measured. In the region B, the height H indicates the flare amount (flare) H that is the protein concentration in the anterior chamber of the eye to be examined. Further, the values protruding and increasing in some places indicate the cells (cells) P1 and P2 floating in the anterior chamber of the eye 1 to be examined.

(Measurement result display)
When the measurement is completed, the output signal of the photoelectric detector 22 is analyzed by the analysis unit 8 and the measurement result is displayed on the display unit 7 as a display screen. The display of the display unit 7 is displayed when the analysis unit 8 controls the switch 10 to switch the display from the image display of the CCD camera 25 to the data display in the analysis unit 8.

(Return after measurement)
When the measurement is completed, the ophthalmic measurement apparatus is switched from the measurement mode to the alignment mode, and returns to the second stage of alignment as shown in FIG. Thereby, measurement can be repeated continuously with the same eye.

  If measurement is not performed at all, in the second stage of alignment, it is determined that the movement of the gantry 11 is equal to or greater than a predetermined amount per unit time, and the alignment alignment is lost. Transition to the stage state.

  Alternatively, when the gantry 11 moves to a predetermined area or when the gantry 11 moves beyond a predetermined boundary, it may be determined that the alignment is broken and the state may be shifted to the first stage of alignment. Good. Furthermore, by moving the gantry 11, the uniformity value using BG1 and BG2 measured in the preliminary measurement in the second stage is larger than a predetermined value (over 20%), and the alignment discriminating unit 9 is not aligned correctly. It may be determined that there is a transition to the first stage state.

  In this way, the transition from the measurement mode to the first stage of alignment allows the ophthalmic measurement apparatus to wait in the first stage when not measuring.

It is a figure which shows schematic structure of the measurement part of LFM which concerns on embodiment. It is a perspective view which shows the external appearance of the measurement part of LFM which concerns on embodiment. It is a side view which shows the external appearance of the measurement part of LFM which concerns on embodiment. It is a flowchart which shows the measurement operation | movement of LFM which concerns on embodiment. It is a figure which shows the mode of the eye to be examined seen from the CCD camera of LFM which concerns on embodiment. It is a table | surface figure which shows the measurement result of LFM which concerns on embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Eye to be examined 2 Measuring part 3 Projection optical axis 4 Projection optical system 5 Light reception optical axis 6 Light reception optical system 7 Display part 8 Analysis part 9 Alignment discrimination | determination part 10 Switch 11 Mount 12 Joystick 13 Start button 14 Laser light source 15 Condensing lens 16 Observation Light Light Source 17 Slit 18 Shutter 19 Half Mirror 20 Lens 21 Light-Receiving Mask 22 Photoelectric Detector 23 Shutter 24 Half Mirror 25 CCD Camera 26 Lens

Claims (5)

An ophthalmologic measuring apparatus comprising a measuring unit having a projection optical system, a light receiving optical system, and an observation light projecting means, while measuring the biological characteristics in the subject eye by projecting light into the subject eye and receiving scattered light There,
The projection optical system projects projection light obliquely with respect to the eyeball optical axis of the eye to be examined from the projection light source into the eye to be examined.
The light receiving optical system receives the scattered light scattered by the measurement target portion in the eye to be examined by the projection light of the projection optical system,
The observation light projection means projects observation light onto the eye to be examined at the time of alignment between the measurement unit and the eye to be examined before measurement,
The alignment between the measurement unit and the eye to be examined is
A first stage of projecting observation light while the examiner aligns the measuring unit with the eye to be examined;
After the first stage, to determine the acceptability of the alignment by the scattered light received by the light receiving optical system by projecting projection light from the first stage the projection Shako science system while projecting the reduced observation light amount than The second stage,
Is performed divided into to,
The determination of the quality of the alignment in the second stage is performed by detecting the amount of light immediately before and after the scattered light scans the measurement target part, and calculating the uniformity of the amount of light immediately before and after the measurement. ophthalmology measuring apparatus you and performing the result of quality.   The ophthalmic measurement apparatus according to claim 1, wherein when the alignment is determined to be good in the second stage, projection of the observation light onto the eye to be examined is stopped and measurement is started.   The ophthalmic measurement apparatus according to claim 1, wherein the projection light and the observation light have different wavelengths.   The measurement unit is disposed on a pedestal that can move in the left and right directions with respect to the eye to be examined, and when the movement of the pedestal exceeds a predetermined amount per unit time, the state transitions to the state of the first stage. The ophthalmologic measurement apparatus according to any one of claims 1 to 3. The measurement unit is disposed on a pedestal that can move in the left and right directions with respect to the eye to be examined, and when the pedestal moves to a predetermined area or when the pedestal moves beyond a predetermined boundary, It changes to a state, The ophthalmic measurement apparatus of any one of Claims 1-4 characterized by the above-mentioned.

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