JP5249072B2 - Eye size measuring device - Google Patents

Description

  The present invention relates to an eye size measuring device that measures the eye size of a subject's eye.

  There is known an optical interferometric eye size measuring device that measures the axial length of an eye to be examined and the size of an anterior segment (for example, corneal thickness, anterior chamber depth, etc.) in a non-contact manner by using interference of low-coherent light ( Patent Document 1).

JP 2005-160694 A

  When measuring the anterior segment size in a conventional apparatus, the examiner performs alignment and fixation guidance on the subject's eye so that the specular reflection component from each layer in the anterior segment can be detected with high accuracy (the subject is subject to fixation). It was necessary to match the optical axis of the optometry with the optical axis of the device. However, the adjustment work as described above is very laborious and may cause a long measurement time and a decrease in measurement accuracy.

  In view of the above problems, it is an object of the present invention to provide an eye dimension measuring device that can smoothly measure the axial length and anterior eye dimension of an eye to be examined.

  In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) A measurement light source that emits low-coherent light, an optical path length changing member that is movably arranged to change the optical path length of a part of the light emitted from the measurement light source, and a light receiving element. An interference optical system that irradiates the anterior eye part and fundus of the eye to be examined with low coherent light, and receives the reflected light from the eye to be examined as interference light by the light receiving element;
In an eye dimension measuring apparatus comprising: an arithmetic control unit that measures the axial length and anterior eye dimension of an eye to be examined based on an interference signal output from the light receiving element;
The measurement light source is
A first light source that emits a first low-coherent light having a center wavelength within a range of 750 to 1100 nm for measuring an axial length;
And a second light source that emits a second low-coherent light having a center wavelength within a range of 400 to 700 nm for measuring an anterior segment size.
(2) In the eye dimension measuring device according to (1),
The interference optical system has a light dividing member that divides each light emitted from the first and second light sources,
The optical path length changing member is capable of simultaneously changing the optical path lengths of the lights emitted from the first and second light sources divided by the light dividing member.
(3) In the eye dimension measuring device according to (2),
The light receiving element is a first light receiving element that receives reflected light from the eye to be examined by the first light source, and has a spectral sensitivity wavelength corresponding to the emission wavelength of the first light source. A second light receiving element for receiving reflected light from the eye to be examined by the second light source, and having a spectral sensitivity wavelength corresponding to the emission wavelength of the second light source;
It is characterized by providing.
(4) In the eye dimension measuring device of (3),
The arithmetic control unit is an arithmetic control unit that controls the first light source and the second light source,
Each of the first light source and the second light source is turned on, and the eye axis of the eye to be inspected based on an interference signal output from the first light receiving element in a state where the optical path length changing member is moved. The length is measured, and the anterior dimension of the eye to be examined is measured based on the interference signal output from the second light receiving element.

  Smooth measurement of the axial length and anterior dimension of the eye

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an optical system of an eye dimension measuring apparatus according to this embodiment.

  An irradiation optical system 10 arranged to irradiate measurement light to the anterior ocular segment and the fundus of the eye to be examined includes measurement light sources 1a and 1b (for example, SLD) that emit low-coherent light and measurement light sources 1a and 1b. Collimator lenses 2a and 2b arranged to convert the emitted light beams into parallel light beams, and a dichroic mirror 3 arranged to synthesize the light emitted from the light source 1a and the light emitted from the light source 1b, The beam splitter 5 that divides / combines each light emitted from the light sources 1a and 1b, the first triangular prism (corner cube) 7 arranged in the transmission direction of the beam splitter 5, and the reflection direction of the beam splitter 5 The second triangular prism 9, the polarization boom splitter 11, the quarter wavelength plate 13, and the inspection window 17 are included. As the dichroic mirror 3, for example, an optical member having an optical characteristic of transmitting the light emitted from the light source 1a and reflecting the light emitted from the light source 1b can be used.

  The measurement light source includes a first light source 1a that emits a first low-coherent light having a central wavelength within a range of 750 to 1100 nm for measuring an axial length, and a center within a range of 400 to 700 nm for measuring an anterior segment size. And a second light source 1b that emits low-coherent light having a wavelength. In this case, the emission wavelength of the first light source 1a is set to a wavelength band in which the transmittance within the eye is high. The emission wavelength of the second light source 1b is set to a wavelength band in which the scattering effect at each part (cornea, crystalline lens) of the anterior segment is high. Note that at least one of the first light source 1a and the second light source 1b can be used as a fixation light source for fixing the eye to be examined.

  As the first light source 1a, it is more preferable to use a light source having a central wavelength at any one of λ = 750 to 850 nm, which has a higher transmittance in the eye. Moreover, as the 1st light source 1a, the light source which has a center wavelength in either (lambda) = 1000-1100nm with the high transmittance | permeability with respect to a cataract turbidity can be used. Further, as the second light source 1b, it is more preferable to use a light source having a central wavelength at any one of λ = 400 to 500 nm, which has a higher scattering effect in the anterior segment.

  Light (linearly polarized light) emitted from the light source 1 a (light source 1 b) is collimated by the collimator lens 2 a (2 b) and then split by the beam splitter 5 via the dichroic mirror 3. Then, one light divided by the beam splitter 5 is reflected by the triangular prism 7, and the other light divided by the beam splitter 5 is reflected by the triangular prism 9, and then synthesized by the beam splitter 5. Then, the synthesized light is reflected by the polarization beam splitter 11, converted into circularly polarized light by the quarter wavelength plate 13, and then irradiated to the eye to be examined through the dichroic mirror 15 and the examination window 17. At this time, when the measurement light beam is reflected by the subject's eye, the phase is converted by a half wavelength.

  At this time, the light irradiated to the eye to be examined by the first light source 1a is reflected by the eye cornea to be examined and then travels to the light receiving optical system 20 described later. Further, since the light from the first light source 1a has high transmissivity in the eye, it passes through the eye, is reflected by the fundus, and then is emitted from the eye to be examined again through the eye and is received by the light receiving optical system 20. Head to.

  The light emitted to the eye to be examined by the second light source 1b is reflected (scattered) at each part of the anterior eye part of the eye to be examined and then travels to the light receiving optical system 20. In this case, since the light from the second light source 1b has a high scattering effect at each part of the anterior segment, more reflected light is obtained than the anterior segment reflected light from the first light source 1a.

  The light receiving optical system 20 arranged to receive the reflected light from the eye to be inspected by the measuring light irradiated by the irradiation optical system 10 as interference light includes an inspection window 17, a quarter wavelength plate 13, a polarizing beam splitter. 11, a condenser lens 19, a dichroic mirror 26 arranged to divide the interference light from the first light source 1 a and the interference light from the second light source 1 b, and a light receiving element that receives the interference light from the first light source 1 a. 27a and a light receiving element 27b that receives interference light from the second light source 1b. As the dichroic mirror 26, for example, an optical member having an optical characteristic of transmitting the interference light from the first light source 1a and reflecting the interference light from the second light source 1b can be used.

  The light receiving optical system 20 is used as a light receiving element for measuring the axial length, and includes a first light receiving element 27a having a spectral sensitivity wavelength corresponding to the emission wavelength of the first light source 1a, and an anterior segment size measurement. And a second light receiving element 27b having a spectral sensitivity wavelength corresponding to the emission wavelength of the second light source 1b. In this case, it is preferable that the first light receiving element 27a has its spectral sensitivity wavelength peak set near the center wavelength of the first light source 1a. The second light receiving element 27b preferably has a spectral sensitivity wavelength peak set near the center wavelength of the second light source 1b. Thereby, the interference light by the 1st light source 1a and the interference light by the 2nd light source 1b are each detectable with sufficient precision.

  The filter unit is not limited to the above-described configuration, and a single light receiving element is provided, and the interference light from the first light source 1a and the interference light from the second light source 1b are selectively passed before the light receiving element. May be provided. In this case, as the filter unit, for example, in the optical path of the light receiving optical system 20, the first filter that passes the interference light by the first light source 1a and cuts the interference light by the second light source 1b, A configuration in which the second filter that passes the interference light from the light source 1b and cuts the interference light from the first light source 1a can be switched.

  Reflected light from the cornea and fundus of the first light source 1a and reflected light from the anterior segment of the second light source 1b are converted into linearly polarized light by the quarter-wave plate 13 through the inspection window 17 and the dichroic mirror 15. Is done. Thereafter, the reflected light transmitted through the polarization beam splitter 11 is collected by the condenser lens 19 and then divided by the dichroic mirror 26. Here, the reflected light from the first light source 1a passes through the dichroic mirror 26 and is received by the light receiving element 27a. The reflected light from the second light source 2a is reflected by the dichroic mirror 26 and received by the light receiving element 27b.

  The triangular prism 7 is used as an optical path length changing member for changing the optical path length, and is linearly moved in the optical axis direction with respect to the beam splitter 5 by driving of a driving unit 71 (for example, a motor). In this case, the optical path length changing member may be a triangular mirror, a corner prism, or the like. The driving position of the prism 7 is detected by a position detection sensor 72 (for example, a potentiometer, an encoder, etc.).

  In the above description, the optical path length changing member may be arranged in the optical path divided by the optical path dividing member and moved so that the optical path difference between the two optical paths is adjusted. Specifically, the optical path length changing member and the optical path dividing member are arranged in the optical path of the irradiation optical system 10 as shown in FIG. 1, or the optical path of the light receiving optical system 20, or the irradiation optical system 10 and the light receiving optical system 20. It may be arranged in the common optical path.

  In the present embodiment, the beam splitter 5 and the prism 7 are arranged in a common optical path of an optical path through which the measurement light from the first light source 1a passes and an optical path through which the measurement light from the second light source 1b passes. Therefore, the beam splitter 5 divides each light emitted from the first light source 1a and the second light source 1b. Each light split by the beam splitter 5 is reflected by the prism 7 and returns to the beam splitter 5. Here, when the prism 7 is moved, the optical path lengths of the respective lights divided by the beam splitter 5 are simultaneously changed.

  In the reflection direction of the dichroic mirror 15, an anterior ocular segment imaging optical system 30 arranged for imaging the anterior ocular segment of the eye to be examined is provided. The imaging optical system 30 includes a dichroic mirror 15, an objective lens 31, a total reflection mirror 33, and a dichroic mirror 15 having a characteristic of dividing the reflected light from the eye to be examined by the light sources 1a and 1b and the reflected light from the eye to be examined by the anterior segment illumination light source 40 An imaging lens 35 and a two-dimensional image sensor 37 are included. Here, the anterior segment image illuminated by the illumination light source 40 is imaged on the two-dimensional image sensor 37 via the inspection window 17, the dichroic mirror 15, the objective lens 31, the total reflection mirror 33, and the imaging lens 37. The As the dichroic mirror 15, for example, an optical member having an optical characteristic of transmitting reflected light from the eye to be examined by the light sources 1 a and 1 b and reflecting reflected light from the eye to be examined by the illumination light source 40 can be used.

  Next, a control system of the apparatus according to the present embodiment will be described. The control unit 80 is connected to a display monitor 81, light sources 1a and 1b, light receiving elements 27a and 27b, a drive unit 71, a position detection sensor 72, a control unit 84, a memory 85, and the like. The control unit 80 processes the light reception signals output from the light receiving elements 27a and 27b, and calculates the axial length of the eye to be examined and the anterior segment size (for example, anterior chamber depth) by calculation. The memory 85 stores the obtained measurement value and the like. In addition, the control unit 84 is provided with various switches such as a measurement start switch 84a that generates a measurement start trigger signal.

  A case where the axial length of the subject's eye and the anterior segment size are measured using the apparatus having the above configuration will be described. While looking at the alignment state of the subject's eye displayed on the monitor 81, the examiner moves the device up / down / left / right and front / rear using an operation means such as a joystick (not shown) to move the device relative to the subject eye E. Put it in the positional relationship. Further, the examiner causes the subject's eye to fixate the fixation lamp (for example, the second light source 1b). In this case, the control unit 80 may illuminate at least one of the light source 1a and the light source 1b in advance.

  Here, when the trigger signal for starting measurement is output, the control unit 80 turns on both the light source 1a and the light source 1b. In this case, the measurement light from the light source 1a and the light source 1b is irradiated to the eye to be examined, and the reflected light from the eye to be examined by the light source 1a and the light source 1b is incident on the light receiving element 27a and the light receiving element 27b.

  In addition, the control unit 80 controls the driving of the driving unit 71 to move the first triangular prism 7 back and forth. Then, the control unit 80 calculates the axial length based on the timing when the interference light is detected by the light receiving element 27a. Further, the control unit 80 calculates the anterior segment size based on the timing when the interference light is detected by the light receiving element 27b.

  Here, the prism 7 is moved from a predetermined initial position in the direction in which the optical path length becomes longer, and the optical path length of the measurement light by the second light source 1 b irradiated to the front surface of the cornea via the prism 7 and the prism 9. When the optical path length of the measurement light from the second light source 1b irradiated on the rear surface of the cornea is matched, interference light between the reflected light on the front surface of the cornea and the reflected light on the rear surface of the cornea is received by the light receiving element. The light is received by 27b. At this time, an interference signal due to the interference light is output from the light receiving element 27b to the control unit 80 and used for calculation of the corneal thickness value.

  Further, the optical path length of the measurement light by the second light source 1b irradiated to the cornea through the prism 7 is moved, and the optical path of the measurement light by the second light source 1b irradiated to the front surface of the crystalline lens through the prism 9. When the lengths coincide with each other, interference light between the reflected light from the cornea and the reflected light from the front surface of the crystalline lens by the second light source 1b is received by the light receiving element 27b. At this time, an interference signal due to the interference light is output from the light receiving element 27b to the control unit 80, and is used to calculate the anterior chamber depth.

  Further, the prism 7 is moved, and the optical path length of the measurement light by the first light source 1 a irradiated to the cornea through the prism 7 and the optical path length of the measurement light by the second light source 1 a irradiated to the fundus through the prism 9. And the interference light between the reflected light from the cornea and the reflected light from the fundus by the first light source 1a is received by the light receiving element 27a. At this time, an interference signal due to the interference light is output from the light receiving element 27a to the control unit 80 and used for calculation of the axial length.

  Here, it can be specified from the signal intensity of the interference signal, the detection order of the signal, and the like that the interference signal output from the light receiving element that receives the interference light corresponds to which part of the eye to be examined. Further, the movement position of the prism 7 when the interference signal as described above is detected can be detected based on the signal output from the position detection sensor 72. Therefore, when calculating the axial length value, a relationship between the movement position of the prism 7 and the axial length of the eye to be examined may be obtained in advance using a predetermined arithmetic expression or a table. Similarly, regarding the corneal thickness and the anterior chamber depth, the relationship between the movement position of the prism 7 and the respective eye dimensions may be obtained in advance. Note that the present invention is not limited to the above method, and each eye dimension may be measured based on the time when the interference signal is detected while the prism 7 is moving.

  Information about the acquired dimensions of the subject's eye is stored in the memory 85 and displayed on the monitor 81. When the predetermined number of measurements are completed (or when a predetermined number of eye dimension values of the subject are obtained), the control unit 80 ends the reciprocating movement of the prism 7 and returns the moving position of the prism 7 to the initial position. Let When a plurality of measurement values are acquired as described above, each measurement value may be output, or an average value of the plurality of acquired measurement values may be output.

  With the configuration as described above, light in a wavelength band having a high scattering effect at each part of the anterior segment is used as light for measuring the anterior segment size, so that the reflected light from each layer in the anterior segment is good. It is possible to detect with a high S / N ratio and to detect interference light with high sensitivity. Therefore, it is not always necessary to adjust the fixation position in order to make the optical axis of the eye to be inspected and the measurement optical axis exactly match, and in order to make the visual axis of the eye to be inspected coincide with the measurement optical axis, What is necessary is to fix the visual light source to the eye to be examined. Therefore, it is possible to reduce the labor for fixation guidance and alignment, and it is possible to smoothly measure the dimensions of the anterior segment.

  In the above configuration, the interference light from the first light source 1a and the interference light from the second light source 1b are separated into each wavelength component and then received by the light receiving element. For this reason, when the 1st light source 1a and the 2nd light source 1b are lighted simultaneously, the interference light by the 2nd light source 1b is detected as a noise signal at the time of detection of the interference signal by the 1st light source 1a, It is possible to avoid a situation in which interference light from the first light source 1a is detected as a noise signal when the interference signal is detected by the second light source 1b.

  In the present embodiment, the light source 1a and the light source 1b are turned on simultaneously when measuring the axial length and measuring the anterior segment size. However, when measuring the axial length, the light source 1a is turned on and the light source 1b is turned on. The light source 1a may be turned off and the light source 1b may be turned on when measuring the anterior segment size. Thereby, it is possible to avoid irradiating the eye to be examined with light unnecessary for each measurement. In this case, for example, the control unit 80 sets a movement range for measuring the axial length and a movement range for measuring the anterior segment in the movable range of the prism 7, and the prism is set in the movement range for measuring the axial length. The light source 1b may be turned on when the light source 1 is disposed, and the light source 1a may be lighted when the prism 7 is disposed in the movement range for measuring the anterior segment.

  In the above description, interference light between the corneal reflection light and the fundus oculi reflection light from the first light source 1a is received by the light receiving element 27a, and the reflected light from the front surface of the cornea from the second light source 1b and other anterior eye regions. Although the interference light with the reflected light is received by the light receiving element 27b, the present invention is not limited to this.

  FIG. 2 is a schematic optical diagram showing an optical system of the eye dimension measuring apparatus according to the second embodiment. In addition, about what attached | subjected the same number of FIG. 1, unless there is particular description, it shall have the same structure and function. In FIG. 2, the dichroic mirror 31 divides the light emitted from the light source 1a into first measurement light and first reference light. Specifically, half of the light emitted from the light source 1a is transmitted and the other half is reflected. Further, the dichroic mirror 31 transmits light emitted from the light source 1b. The dichroic mirror 33 has a role of dividing the light emitted from the light source 1b into the second measurement light and the second reference light. Specifically, the dichroic mirror 33 transmits half of the light emitted from the light source 1b. The remaining half is reflected. The dichroic mirror 33 transmits light emitted from the light source 1a.

  Here, the first measurement light and the second measurement light transmitted through the dichroic mirrors 31 and 33 are irradiated to the eye to be examined. At this time, the light irradiated to the eye to be examined by the first light source 1a is reflected by the eye cornea to be examined, and after being reflected by the fundus of the eye to be examined, is emitted from the eye to be examined and travels toward the light receiving optical system 20. Thereafter, the reflected light passes through the dichroic mirror 33, is reflected by the dichroic mirror 31, and is further condensed on the light receiving element 27a by the condenser lens 26a. Moreover, the light irradiated to the eye to be examined by the second light source 1b is reflected (scattered) at each part of the anterior eye part of the eye to be examined. Thereafter, the reflected light is reflected by the dichroic mirror 33 and further condensed on the light receiving element 27b by the condenser lens 26b.

  In the reflection direction of the dichroic mirror 31, a first reference mirror 36 arranged to reflect the first reference light is arranged to be movable in the optical axis direction. The first reference mirror 36 is moved in the optical axis direction by the drive unit 36a. Thereby, the optical path length of the 1st reference light by the light source 1a is changed. The first reference light reflected by the first reference mirror 36 passes through the dichroic mirror 31 and is further condensed on the light receiving element 27a by the condenser lens 26a. In this case, the optical path length of the first reference light is changed by the movement of the first reference mirror 36, and the optical path length of the first measurement light applied to the eye fundus of the subject and the first reference reflected by the first reference mirror 36. When the optical path length by light matches, the interference light between the fundus reflection light from the light source 1a and the reference light is received by the light receiving element 27a.

  In the reflection direction of the dichroic mirror 33, a second reference mirror 37 arranged to reflect the second reference light is arranged so as to be movable in the optical axis direction. The second reference mirror 37 is moved in the optical axis direction by the drive unit 37a. Thereby, the optical path length of the 2nd reference light by the light source 1b is changed. The second reference light reflected by the second reference mirror 37 passes through the dichroic mirror 33 and is further condensed on the light receiving element 27b by the condenser lens 26b. In this case, the optical path length of the second reference light is changed by the movement of the second reference mirror 37, and the optical path length by the second measurement light applied to the eye cornea and the second reference reflected by the second reference mirror 37. When the optical path length by the light coincides, the interference light between the cornea reflected light from the light source 1b and the reference light is received by the light receiving element 27b. Similarly, the optical path length of the second reference light is changed by the movement of the second reference mirror 37, and the optical path length of the second measurement light applied to the front surface of the crystalline lens and the second reflected by the second reference mirror 37. When the optical path length by the reference light matches, interference light between the lens front surface reflected light by the light source 1b and the reference light is received by the light receiving element 27b.

  The controller 80 detects the fundus position based on the moving position of the first reference mirror 36 when the interference light between the fundus reflected light and the reference light from the light source 1a is received by the light receiving element 27a. Further, the control unit 80 detects the corneal position based on the moving position of the reference mirror 37 when the interference light between the corneal reflected light and the reference light by the light source 1b is received by the light receiving element 27b. Then, the control unit 80 calculates the axial length from the detected positional relationship between the fundus and the cornea. Further, the control unit 80 detects the lens front surface position based on the moving position of the reference mirror 37 when interference light between the lens front surface reflected light and the reference light by the light source 1b is received by the light receiving element 27b. The anterior chamber depth is measured from the positional relationship between the cornea and the front surface of the lens. Similarly, the corneal thickness can be calculated by detecting the positions of the front and back surfaces of the cornea.

  Moreover, a structure as shown in FIG. 3 may be sufficient. In this case, the half mirror 35 splits the light emitted from the light source 1a into the first measurement light and the first reference light, and converts the light emitted from the light source 1b into the second measurement light and the second reference light. To divide. The first reference mirror 36 is a total reflection mirror, and the second reference mirror 37 is a dichroic mirror, which transmits the first reference light from the light source 1a and reflects the second reference light from the light source 1b. Also in the configuration of FIG. 3, as in FIG. 2, the axial length and the anterior chamber are based on the interference signals output from the light receiving elements 27a and 27b when the first reference mirror 36 and the second reference mirror 37 are moved. Depth, etc. can be calculated.

  In the above configuration, the fundus detection mirror (reference mirror 36) and the anterior eye segment detection mirror (reference mirror 37) are provided as reference mirrors for changing the optical path length of the reference light. It is not limited to. The fundus position and the position of each part of the anterior segment may be detected by moving one reference mirror. For example, in FIG. 3, the reference mirror 37 may be removed, and the reference mirror 36 may be moved within a movement range in which the fundus position detection and the position detection of each part of the anterior eye part are possible.

  In the above configuration, the optical path length of the reference light is changed by linearly moving the reference mirror. However, the present invention is not limited to this, and the optical path length of the reference light is controlled by an optical delay mechanism using a rotating reflector. Even if it is the structure which changes this, application of this invention is possible (for example, refer Unexamined-Japanese-Patent No. 2005-160694).

It is a schematic block diagram of the optical system of the eye dimension measuring apparatus which concerns on this embodiment. It is a schematic optical diagram shown about the optical system of the eye dimension measuring apparatus which concerns on 2nd Embodiment. It is a schematic optical figure shown about the optical system of the eye dimension measuring apparatus which concerns on 3rd Embodiment.

1a First light source 1b Second light source 5 Beam splitter 7 Triangular prism (optical path length changing member)
DESCRIPTION OF SYMBOLS 10 Irradiation optical system 20 Light reception optical system 27a 1st light receiving element 27b 2nd light receiving element 71 Drive part 80 Control part

Claims (4)

A measurement light source that emits low-coherent light, an optical path length changing member that is movably arranged to change the optical path length of a part of the light emitted from the measurement light source, and a light receiving element. An interference optical system that irradiates the anterior ocular segment and fundus of the optometry with low coherent light, and receives the reflected light from the subject's eye as interference light by the light receiving element;
In an eye dimension measuring apparatus comprising: an arithmetic control unit that measures the axial length and anterior eye dimension of an eye to be examined based on an interference signal output from the light receiving element;
The measurement light source is
A first light source that emits a first low-coherent light having a center wavelength within a range of 750 to 1100 nm for measuring an axial length;
And a second light source that emits a second low-coherent light having a center wavelength within a range of 400 to 700 nm for measuring an anterior segment size. In the eye dimension measuring device according to claim 1,
The interference optical system has a light dividing member that divides each light emitted from the first and second light sources,
The optical path length changing member is capable of simultaneously changing the optical path length of each light emitted from the first and second light sources divided by the light dividing member. In the eye dimension measuring device according to claim 2,
The light receiving element is a first light receiving element that receives reflected light from the eye to be examined by the first light source, and has a spectral sensitivity wavelength corresponding to the emission wavelength of the first light source. A second light receiving element for receiving reflected light from the eye to be examined by the second light source, and having a spectral sensitivity wavelength corresponding to the emission wavelength of the second light source;
An eye dimension measuring device comprising: In the eye dimension measuring device according to claim 3,
The arithmetic control unit is an arithmetic control unit that controls the first light source and the second light source,
Each of the first light source and the second light source is turned on, and the eye axis of the eye to be inspected based on an interference signal output from the first light receiving element in a state where the optical path length changing member is moved. An eye dimension measuring apparatus, characterized in that a length is measured and an anterior eye dimension of an eye to be examined is measured based on an interference signal output from the second light receiving element.

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