JPH11276436A - Ophthalmological device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmological device capable of speedily completing alignment by detecting deflection between a subject eye and a device optical axis at the time of alignment, and informing a subject person of a chin rest to be moved and a chin rest moving direction based on deflection quantity. SOLUTION: Light is radiated from a front eye part illumination light source 25 to a subject eye E, reflection light is introduced to a CCD 14, and a front eye part image is obtained. A pupil image E is extracted based on the obtained front eye part image, and deflection quantity Δ between a center position of the pupil image E and a device optical axis O is computed. A relative position of an optical system housing part 3 to a frame 2 is detected by a position detection part 6, and a movable distance D of the optical system housing part 3 is computed based on the relative position. When the movable distance D is almost similar to the deflection quantity Δ, or when the movable distance D is larger than the deflection quantity Δ, letters 'CHIN' and an arrow '↑'or '↓' are displayed in a monitor 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus for performing examination or measurement of intraocular pressure or the like on an eye to be examined.

[0002]

2. Description of the Related Art Conventionally, in order to perform inspection or measurement of intraocular pressure or the like on an eye to be inspected, measurement of an eye to be inspected and an optical system housing section that houses an optical system for performing inspection or measurement of intraocular pressure or the like have been performed. Alignment with the optical axis (device optical axis) was required. For this reason, an ophthalmologic apparatus is used in which an examiner adjusts the position of an optical system storage unit with a joystick or the like while looking at a finder or a monitor to perform alignment. In addition, alignment target light is projected from the alignment target projection system to the eye to be inspected, and the reflected light from the cornea is guided to the alignment detection system. Ophthalmic devices that automatically align the system storage unit are also becoming popular.

[0003] Since the size of the face of the subject varies from person to person, the chin rest for placing the chin on the subject is moved in the vertical direction during examination of the eye to be examined or measurement of intraocular pressure or the like. It is also necessary to adjust the position.

[0004]

By the way, if the eye to be examined is greatly displaced from the optical axis of the optical system housing during the alignment, before the examiner starts the position adjustment operation using the joystick or the like. In addition, it is necessary to roughly adjust the position of the chin rest on which the chin of the subject is placed so that the anterior eye image of the subject's eye is positioned near the center in the vertical direction of the monitor.

However, an examiner who is unfamiliar with the ophthalmic apparatus may try to complete the alignment only by adjusting the position using a joystick or the like without adjusting the chin rest. In this case, the adjustment of the chin rest is not sufficiently performed until the optical system housing is moved to the limit of the movable range, and the alignment is restarted from the beginning.

To solve this problem, Japanese Patent Laid-Open Publication No.
Japanese Patent No. 36119 discloses a chin by driving and controlling a motor for vertically moving a chin rest on the basis of an output of an alignment detection system that optically detects an alignment state between an eye to be inspected and an optical axis of the apparatus. An ophthalmic device that automatically adjusts the position of the receiver is described.

However, in the ophthalmic apparatus in which the chin rest is automatically moved in the vertical direction as described above, the chin rest is automatically moved when the subject does not expect it. The subject may be surprised by the movement of the receiver and release his / her face from the chin rest, or the face of the subject may bend relative to the ophthalmologic apparatus main body without releasing the face.
Therefore, in such a case, the alignment cannot be completed quickly.

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ophthalmologic apparatus capable of rapidly completing alignment.

[0009]

According to a first aspect of the present invention, there is provided an image pickup device for picking up an image of an eye of a subject, and fixing the face of the subject. In an ophthalmologic apparatus including a face fixing unit configured to be movable in the up and down direction, a shift amount detecting unit that detects a shift amount of the subject's eye from a predetermined position based on an output result of the imaging unit, And a notifying means for notifying information on the movement of the face fixing means based on an output result of the shift amount detecting means.

[0010] In the ophthalmologic apparatus according to the first aspect of the present invention, the second aspect of the present invention is configured such that the optical system for inspecting or measuring the eye to be examined is housed and is movable at least in the vertical direction. Optical system storage section, movable range detection means for detecting the movable range of the optical system storage section, and comparison means for comparing the output result of the movable range detection means with the output result of the deviation amount detection means With
The notifying unit notifies information on the movement of the face fixing unit based on a comparison result of the comparing unit.

In the ophthalmologic apparatus according to the first or second aspect of the present invention, in the third aspect of the present invention, the shift amount detecting means includes a pupil based on an anterior eye image of the subject's eye imaged by the imaging means. An image is extracted, and a shift amount of the eye to be inspected from a predetermined position is detected based on a position of the pupil image.

[0012] In the ophthalmologic apparatus according to any one of the first to third aspects, the invention according to the fourth aspect is characterized in that the information on the movement of the face fixing means is that the face fixing means should be moved. And at least one of information indicating a direction in which the face fixing means should be moved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing an external configuration of an ophthalmologic apparatus according to an embodiment of the present invention as viewed from an examiner. FIG. 2 is an external configuration of an ophthalmologic apparatus according to an embodiment of the present invention as viewed from a subject. Figure showing
FIG. 3 is a diagram showing a configuration of an ophthalmologic apparatus according to an embodiment of the present invention;
FIG. 4 is a block diagram illustrating a configuration related to control of the ophthalmologic apparatus according to the embodiment of the present invention.

As shown in FIGS. 1 and 2, an ophthalmologic apparatus according to an embodiment of the present invention includes a base 1 installed on a table or the like (not shown), and a gantry 2 movably provided on the base 1. An optical system storage unit 3 movably attached to the gantry 2 and housing an optical system for performing inspection or measurement of intraocular pressure or the like on the eye E to be inspected, and fixing the face of the examinee in the vertical direction And a chin rest 7 having a chin rest 7a that is movable to the right.

A joystick 4 and operation buttons 9 are provided on the gantry 2.

The joystick 4 can be manually operated by the examiner in the horizontal direction (X direction), the vertical direction (Y direction),
And it is used as a control lever for moving the optical system housing 3 in the front-back direction (Z direction).

The operation buttons 9 are provided with a U button (UP button) 9a for moving the chin rest 7a upward and a D button (DOWN button) 9b for moving the chin rest 7a downward. When the examiner presses the U button 9a or the D button 9b, the drive of the motor 8 is controlled to move the chin rest 7a upward or downward.

The gantry 2 includes a three-dimensional driving unit 5 for moving the optical system storage unit 3 in three dimensions (X, Y, and Z directions) by operating the joystick 4 by the examiner. A position detection unit 6 for detecting a relative position of the system storage unit 3 with respect to the gantry 2.

The position detector 6 determines the direction (upward and downward) of the optical system housing 3 from the movable distance D in which the optical system housing 3 can move, that is, the detected relative position. It has a function of calculating whether it can be moved (about several mm to several cm). Specifically, for example, a calculation is performed such that the user can move up to 3 cm in the upward direction and up to 5 cm in the right direction. Note that information on the movable range of the optical system housing 3 (for example, X direction, Y direction,
The direction and the movement limit coordinates based on the predetermined reference coordinates in each of the Z directions are stored in the memory 20 in advance in accordance with the mechanical reasons of the ophthalmologic apparatus. Further, a potentiometer, an incremental encoder, or the like can be used as a detection element used in the position detection unit 6.

The optical system housing 3 is provided with an objective lens 10, a half mirror 11, a relay lens 12, and a measurement for inspecting or measuring intraocular pressure and the like on the eye E to be inspected. A unit 13, a CCD (charge-coupled device) 14 for forming an anterior segment image of the eye E, and an alignment view including an optical system for projecting a target for alignment with the eye E A target projection system 15, an alignment detection system 16 for detecting reflected light from the cornea of the target projected onto the eye E, and an anterior segment illumination light source 25 for illuminating the anterior segment of the eye E The objective lens 10, the half mirror 11, the CCD 14, and the like are arranged on the optical axis O of the apparatus.

An anterior segment observation system for imaging the eye E to be examined is constituted by the objective lens 10, the CCD 14, and the anterior segment illumination light source 25. In the imaging of the anterior segment image of the eye E, the anterior segment of the eye E is illuminated by the anterior segment illumination light source 25, and the reflected light from the illuminated anterior segment of the eye E is reflected by the objective lens 10 and The image is guided to the CCD 14 via the half mirror 11, and the CCD 14 forms an anterior eye image of the eye E to be inspected.

Also, the objective lens 10 and the half mirror 1
1, the relay lens 12, and the measuring unit 13 form an eye measurement system. In the measurement of the intraocular pressure and the like of the eye E, the light is irradiated to the eye E by a measurement light source (not shown), and the reflected light from the eye E is measured via the objective lens 10, the half mirror 11, and the relay lens 12. 13 to obtain a measurement signal.

The alignment target projecting system 15 includes an alignment target projecting light source 15a, a lens 15b, a half mirror 15c, and the like. The half mirror 15c is arranged on the optical axis O of the device. Light from the alignment target projecting light source 15a is projected onto the eye E via the lens 15b and the half mirror 15c.

The alignment detection system 16 includes, for example, an alignment detection unit 16a having a PSD (position detector) for detecting an alignment position indicating the optical axis O of the apparatus, a lens 16
b, a half mirror 16c and the like. The half mirror 16c is arranged on the optical axis O of the device. The light projected from the alignment target projecting light source 15a to the eye E and reflected from the cornea is guided to the alignment detecting unit 16a via the objective lens 10, the half mirror 16c, and the lens 16b. Thereby, the alignment position is detected.

The gantry 2 further includes a control unit 17 including a CPU (central processing unit) for controlling the operation of the entire ophthalmologic apparatus, and a monitor 18 for displaying an anterior eye image of the eye E to be examined. ing.

The control section 17 has a function of calculating a deviation amount Δ between a predetermined position of the eye E and the optical axis O of the apparatus based on the anterior eye image of the eye E acquired by the CCD 14. ,
As will be described later, the shift amount Δ between the predetermined position of the eye E and the optical axis O of the apparatus is compared with the movable distance D of the optical system storage unit 3, and the movable distance D is determined based on the comparison result. When the displacement amount D is almost equal to or when the movable distance D is larger than the displacement amount Δ (D> Δ), the monitor 18 displays the chin rest 7.
The character "CHIN" indicating that a should be moved and the arrow "矢 印" or "↓" indicating the direction in which the chin rest 7a should be moved are displayed. On the other hand, when the movable distance D is sufficiently large to be negligible compared to the shift amount Δ (D>
> Δ), it is not necessary to adjust the height of the chin rest 7a.
Or do not display "↓". The character "CHIN"
The alignment notification information (information related to the movement of the chin rest 7a) indicating the arrow “↑” or “↓” is stored in the memory 20 in advance, and the necessary alignment information is obtained from the memory 20 according to the comparison result of the control unit 17. The notification information is read and displayed on the monitor 17.

Further, the control unit 17, as shown in FIG.
Via the connection line 21, the joystick 4, the three-dimensional driving unit 5, the position detecting unit 6, the measuring unit 13, the CCD 14, the alignment target projecting light source 15a, the alignment detecting unit 16a, the monitor 18, the memory 20, and the anterior eye unit It is connected to the illumination light source 25 and controls the operation of each unit.

The monitor 18 displays an anterior segment image of the eye E to be examined and characters "CHIN" as alignment information and arrows "矢 印" or "↓".

As shown in FIG. 3, an area M having an auto-alignable area and an auto-measurable area (the auto-measurable area is provided inside the auto-alignable area) is displayed on the monitor 18. Automatic alignment is performed by using the joystick 4 to align the subject's eye E within the automatically alignable area, and the subject's eye E is aligned within the automatically measurable area to enable automatic measurement.

Next, the operation of the ophthalmologic apparatus according to the embodiment of the present invention will be described.

FIG. 5 is a flowchart showing alignment notification processing in the control unit of the ophthalmologic apparatus according to the embodiment of the present invention. In FIG. 5, in step S <b> 1, light is illuminated from the anterior ocular segment illumination light source 25 to the eye E, the reflected light is guided to the CCD 14 via the objective lens 10, and an image of the anterior segment of the eye E is obtained. get. The acquired anterior ocular segment image is output to the control unit 17. The acquired anterior segment image is shown in FIG.
Is displayed on the monitor 18 as shown in FIG.

In step S2, a pupil image Ep is extracted based on the acquired anterior eye image.

In step S3, it is determined whether or not the pupil image Ep has been extracted in step S2. The reason for making this determination in step S3 is, for example,
The height adjustment of the eye E is extremely inadequate, and therefore the eye E to be examined is greatly deviated from the optical axis O of the apparatus. As a result, the position of the pupil of the eye E may not be detected in some cases.

If it is determined in step S3 that the pupil image Ep cannot be extracted from the anterior eye image, the monitor 18
"CHI" indicating that the chin rest 7a should be moved to
Only "N" is blinked (step S9). Thereby, the examiner can display the character “CHI” displayed on the monitor 18.
The height of the chin rest 7a is adjusted by operating the operation button 9 while checking the positional relationship between the subject's eye E and the optical system housing part 3 by watching the blinking display of "N", and the anterior segment of the subject's eye E The image is on the monitor 18
To the center of the display screen.

On the other hand, if the pupil image Ep can be extracted from the anterior segment image in step S3, as shown in FIG.
The shift amount Δ between the center position of the extracted pupil image E and the apparatus optical axis O is calculated (step S4). Here, the subject's eye E
Is shifted upward with respect to the apparatus optical axis O (that is, the eye E is positioned above the apparatus optical axis O), and the eye E is shifted downward with respect to the apparatus optical axis O ( That is, the subject's eye E
Is located below the optical axis O of the apparatus) in some cases. Therefore, in the calculation of the shift amount Δ, the shift information of which is shifted is also obtained.

Since the pupil of the eye E to be examined looks much darker than other parts, the pupil image can be easily extracted by setting a predetermined threshold value and binarizing the anterior eye image. it can. Of course, it is also possible to extract a boundary portion other than the pupil of the eye E, for example, between the sclera and the cornea, and thereby to grasp the position of the eye E.

In step S5, the position detector 6 detects the relative position of the optical system housing 3 with respect to the gantry 2. Information on the detected relative position is output to the control unit 17.

In step S6, the movable distance D of the optical system housing 3 is calculated based on the relative position detected by the position detector 6. As described above, the optical system storage unit 3
Since the information on the movable range is stored in the memory 20 in advance, the movable distance D is calculated based on the detected relative position and the information on the movable range stored in advance.

In step S7, the displacement Δ calculated in step S4 is compared with the movable distance D calculated in step S6. As a result of the comparison, the movable distance D becomes the deviation amount Δ
Or the movable distance D is the deviation amount Δ
If it is larger than (D> Δ), the character “CHIN” indicating that the chin rest 7a should be moved and the arrow “↑” or “↓” indicating the direction in which the chin rest 7a should be moved are displayed on the monitor 18. (Step S8). For the arrow, the direction in which the chin rest 7a should be moved is determined based on the displacement information acquired in step S4,
An arrow “↑” or “↓” is displayed on the monitor 18 according to the determination result.

Therefore, the examiner looks at the character “CHIN” and the arrow “↑” or “↓” displayed on the monitor 18 and confirms the positional relationship between the eye E and the optical system housing 3 while operating the operation button. 9 is operated to adjust the height of the chin rest 7a so that the image of the anterior segment of the eye E is positioned near the center of the display screen of the monitor 18.

On the other hand, as a result of the comparison in step S7,
If the movable distance D is sufficiently large (D >> Δ) to be negligible compared to the shift amount Δ, it is not necessary to adjust the height of the chin rest 7a. "And arrows" ↑ "or" ↓ "are not displayed. That is, in this case, if alignment is performed only by operating the joystick 4, light is projected from the alignment target projection light source 15a of the alignment target projection system 15 to the eye E, and light reflected from the cornea is detected by the alignment detection system. This is because the light is incident on the 16 alignment detectors 16a. This enables automatic alignment.

As described above, according to the present invention, the character “CHIN” and the arrow “↑” or “↓” are displayed on the monitor 18 based on the comparison result between the movable distance D and the deviation amount Δ, Is notified of the information on the movement of the chin rest 7a, but the present invention is not limited to this. For example, an audio output unit is provided in the ophthalmologic apparatus according to the embodiment of the present invention, and “the chin rest is moved upward (or downward)” from the audio output unit based on the comparison result between the movable distance D and the shift amount Δ. The message "Please move to.""To inform the examiner of the information on the movement of the chin rest 7a, whereby the alignment can be completed quickly.

[0044]

As described above, according to the present invention, a deviation between the eye to be examined and the optical axis of the apparatus is detected in the alignment between the eye to be examined and the optical system housing for performing inspection or measurement of intraocular pressure or the like. Since the examiner is informed that the chin rest should be moved and the direction in which the chin rest should be moved based on the detected deviation amount, the alignment can be completed quickly.

Particularly, in the present invention, the operation of moving the chin rest is entrusted to the examiner by notifying the examiner that the chin rest is necessary without automatically moving the chin rest.
The chin rest moves at an unexpected time of the subject, and the subject can be prevented from being surprised and separating his / her face from the chin rest, or preventing the face from bending with respect to the ophthalmologic apparatus main body without releasing the face. . Therefore, it is possible to complete the alignment more reliably and quickly.

As described above, it is possible to quickly perform the examination of the eye to be examined or the measurement of the intraocular pressure and the like, so that the burden on the examinee and the examiner can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an external configuration of an ophthalmologic apparatus according to an embodiment of the present invention as viewed from an examiner.

FIG. 2 is a diagram illustrating an external configuration of the ophthalmologic apparatus according to the embodiment of the present invention as viewed from a subject;

FIG. 3 is a diagram illustrating a configuration of an ophthalmologic apparatus according to an embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration related to control of the ophthalmologic apparatus according to the embodiment of the present invention.

FIG. 5 is a flowchart illustrating alignment notification processing in a control unit of the ophthalmologic apparatus according to the embodiment of the present invention.

FIG. 6 is a diagram showing an anterior eye image displayed on a monitor of the ophthalmologic apparatus according to the embodiment of the present invention.

FIG. 7 is a diagram illustrating a relationship between a pupil image extracted from an anterior segment image acquired by the ophthalmologic apparatus according to the embodiment of the present invention and an alignment position indicating an optical axis of the apparatus.

[Explanation of symbols]

 E Eye to be inspected Ep Pupil image M Area O Device optical axis 1 Base 2 Mount 3 Optical system storage unit 4 Joystick 5 3D drive unit 6 Position detection unit 7 Jaw receiver 7a Jaw receiver 8 Motor 9 Operation button 10 Objective lens 11 Half mirror Reference Signs List 12 relay lens 13 measuring unit 14 CCD 15 alignment target projecting system 16 alignment detecting system 17 control unit 18 monitor 20 memory 21 connection line 25 light source for anterior eye illumination

Claims (4)

[Claims] 1. An ophthalmologic apparatus comprising: imaging means for imaging an eye of a subject; and face fixing means configured to fix the face of the subject and to be vertically movable. A shift amount detection unit that detects a shift amount of the subject's eye from a predetermined position based on an output result of the imaging unit; and information about movement of the face fixing unit based on an output result of the shift amount detection unit. An ophthalmologic apparatus comprising: an informing means for informing. 2. An optical system storage unit configured to house an optical system for examining or measuring the eye to be inspected and movable at least in a vertical direction, and to detect a movable range of the optical system storage unit. Moving range detecting means, and comparing means for comparing an output result of the moving range detecting means with an output result of the deviation amount detecting means, wherein the notifying means is configured to output the face based on a comparison result of the comparing means. The ophthalmologic apparatus according to claim 1, wherein information on a movement of the fixing unit is notified. 3. The displacement amount detecting unit extracts a pupil image from an anterior segment image of the eye to be inspected imaged by the imaging unit, and extracts a pupil image from a predetermined position of the eye to be inspected based on the position of the pupil image. The ophthalmologic apparatus according to claim 1, wherein the shift amount is detected. 4. The information on the movement of the face fixing means,
4. The ophthalmologic apparatus according to claim 1, further comprising at least one of information indicating that the face fixing unit should be moved and information indicating a direction in which the face fixing unit should be moved.