WO2012144075A1 - Dispositif de mesure ophtalmologique - Google Patents

Dispositif de mesure ophtalmologique Download PDF

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Publication number
WO2012144075A1
WO2012144075A1 PCT/JP2011/059962 JP2011059962W WO2012144075A1 WO 2012144075 A1 WO2012144075 A1 WO 2012144075A1 JP 2011059962 W JP2011059962 W JP 2011059962W WO 2012144075 A1 WO2012144075 A1 WO 2012144075A1
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WIPO (PCT)
Prior art keywords
measurement
eye
examined
alignment
light source
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PCT/JP2011/059962
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English (en)
Japanese (ja)
Inventor
浩太郎 光本
鈴木　孝佳
Original Assignee
興和株式会社
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Application filed by 興和株式会社 filed Critical 興和株式会社
Priority to JP2013510835A priority Critical patent/JP5864550B2/ja
Priority to PCT/JP2011/059962 priority patent/WO2012144075A1/fr
Publication of WO2012144075A1 publication Critical patent/WO2012144075A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/0075—Apparatus for testing the eyes; Instruments for examining the eyes provided with adjusting devices, e.g. operated by control lever

Definitions

  • the present invention relates to an ophthalmologic measurement apparatus capable of measuring the optical characteristics of the front part of the eyeball of a subject and quantifying, for example, the protein concentration in the aqueous humor of the subject eye.
  • the protein concentration (flare) and cell (cell) density in the anterior chamber reflect the pathology of various diseases including postoperative inflammation. It is clinically important to measure these quantitatively.
  • a laser beam is irradiated from the laser light source to the anterior eye portion of the subject, and the scattered light of the laser beam in the anterior eye portion is received by the light receiving portion and converted into an electrical signal.
  • a method for obtaining optical characteristics of an anterior segment from a signal is known.
  • a monitor light receiving unit As a measuring device used in such a measuring method, a monitor light receiving unit is provided, and a virtual image and a laser beam scattered light of the scattered light of the laser beam irradiated to the eye to be examined are received by the monitor light receiving unit, An ophthalmologic measurement apparatus that adjusts (aligns) the positions of the laser light source and the light receiving unit according to the positions of the virtual image and the scattered light in the monitor light receiving unit is known (see, for example, Patent Document 1). ).
  • alignment is performed with reference to the corneal apex that is different from the optical configuration of the light projecting system and the light receiving system, and the intersection point where the optical axes of the light projecting system and the light receiving system intersect within the eye to be examined is shifted by a predetermined distance from the vertex of the cornea
  • An ophthalmologic measurement apparatus that sets a biometric characteristic measurement point is known (see, for example, Patent Document 2).
  • a semiconductor laser that irradiates a laser beam to the anterior segment of the eye to be examined at an angle of 30 °
  • a high-sensitivity light receiving element that receives scattered light of the laser beam at an angle of 60 ° and converts it into an electrical signal
  • An arithmetic unit that calculates the optical characteristics of the eye, an infrared LED that irradiates light to the subject's eye from the front, a CCD that images the eye to be examined from the front, and a red that irradiates the subject's eye with an angle of approximately 30 °
  • an ophthalmologic measurement apparatus in which an outer LED and a CCD for photographing an eye to be examined at an angle of 60 ° are integrally provided in a measurement unit. In this case, based on the first and second virtual images by the two CCDs displayed on the monitor, the positional relationship between the eye to be examined and the measurement unit is adjusted by moving the gantry (see, for example, Patent Document 3). .
  • the anterior eye part is irradiated with a laser beam from the laser light source.
  • the optical characteristics of the anterior eye part are obtained by receiving the scattered light of the laser beam in the light receiving part.
  • the measurement of the optical characteristics of the anterior segment is often performed by automatic measurement, but in this automatic measurement, the examiner feels stress, such as the measurement operation not being performed at the timing intended by the examiner. There are many. Therefore, even when automatic measurement is basically performed, it is required that the examiner can perform manual measurement appropriately depending on the situation. Further, it has been demanded that the examiner can appropriately select the alignment method.
  • the present invention has been devised in view of the above-described problems of the prior art, and in an ophthalmologic measurement apparatus that measures the optical characteristics of the anterior segment of an eye to be examined, a combination of alignment methods and measurement methods is more efficient. It is an object of the present invention to provide a technique that allows measurement with a higher degree of freedom.
  • the light is incident on the eye to be examined from the front and the alignment is performed by photographing the eye to be examined from the front, and the light is incident on the eye to be examined from an oblique direction and the eye to be examined is seen from the oblique direction. It is possible to select an alignment mode by taking an image, and the greatest feature is that the optical characteristics of the anterior segment of the eye to be examined can be measured from any mode.
  • a laser light source for irradiating a laser beam to the anterior eye portion of the eye to be examined from a direction oblique to the eye to be examined, and a scattered light of the laser beam scattered at the anterior eye portion are received and converted into an electrical signal.
  • an ophthalmologic measurement apparatus that has a light receiving unit and a calculation unit that calculates the optical characteristics of the anterior segment from the electrical signal, and measures the optical characteristics of the anterior portion of the eyeball of the eye to be examined
  • a first light source for irradiating the eye to be examined from the front with respect to the eye to be examined;
  • First imaging means for imaging the eye to be examined from the front;
  • a second light source that irradiates light to the eye from a first oblique direction with respect to the eye to be examined;
  • Second imaging means for imaging the eye to be examined from a second oblique direction with respect to the eye to be examined;
  • Position adjusting means for relatively adjusting the positions of the laser light source, the light receiving unit, the first and second light sources, and the first and second imaging means, and the eye to be examined;
  • a display unit for displaying images taken by the first and second photographing means;
  • a switching unit that switches an image signal from the first or second imaging means to the display unit;
  • the alignment method of irradiating light from the front to the eye to be examined and observing from the front and the alignment method of irradiating the eye to be examined from the oblique direction and observing from the oblique direction are more They can be used easily, and alignment and measurement can be performed with a higher degree of freedom depending on the situation. As a result, it is possible to perform measurement more efficiently or with high accuracy depending on the situation.
  • an alignment mark indicating the target position of the bright spot by the light from the first light source or the laser beam from the laser light source is displayed on the display unit.
  • the eye to be examined there may be a small pupil whose mydriatic is not sufficiently large in the eye to be examined.
  • the laser beam for measurement hits the iris, which sometimes makes measurement difficult.
  • the position, size, and shape of the alignment reference mark are changed so that the examiner can appropriately correct the alignment position. According to this, for example, by providing a small pupil switch, it is possible to more easily deal with an eye to be examined with a small pupil.
  • any of the observation state of the front observation state and the oblique observation state a plurality of combinations for selecting any of the measurement modes of the automatic measurement, the manual measurement, and the measurement impossible state are previously set. Variations are registered, You may make it further have a selection means to select either of these variations. By doing so, the examiner selects an appropriate variation in advance by the selection means before the start of measurement, so that it is not necessary to be aware of the alignment method and the measurement method during the alignment and measurement work. As a result, the measurement efficiency can be further increased and the work related to the measurement can be further simplified.
  • the present invention further includes a determination unit that determines whether or not the adjustment result is good.
  • the automatic measurement when the determination result determines that the adjustment result is good, the automatic measurement is automatically performed.
  • the method for starting the measurement of the optical characteristic and the measurement of the optical characteristic is automatically started when the determination unit determines that the adjustment result is good during the period when the measurement button is operated. It may be possible to select a method. According to this, for example, by selecting the former method, the operation of operating the measurement button becomes unnecessary, and the measurement operation can be simplified. Further, for example, by selecting the latter method, it is possible to prevent light such as laser light from being irradiated when the measurer does not intend. It is convenient that the measurer can arbitrarily set the measurement method in the automatic measurement as described above.
  • the first and second imaging means in the ophthalmic measurement apparatus of the present invention can capture the reflected light (virtual image) of the light from the first and second light sources, and the light from the laser light source. Any means capable of photographing the reflected light (real image) from the subject eye is not particularly limited.
  • an image sensor such as a CCD image sensor may be used from the viewpoint of processing of a photographed image and simplicity of the configuration.
  • the laser light source, the light receiving unit, the first and second light sources, and the photographing means are provided so that their relative positions can be fixed. By fixing these relative positions, it is possible to prevent the positional relationship between the photographing means and each light source from being displaced, and to ensure alignment reproducibility.
  • the ophthalmic measurement apparatus of the present invention relatively adjusts the position of the eye to be examined and the optical system including the laser light source, the light receiving unit, the first and second light sources, and the first and second imaging means.
  • Position adjusting means is provided.
  • the position adjusting means may be means for adjusting the position of the optical system with respect to the eye to be examined, or means for adjusting the position of the subject or the face of the subject while the position of the optical system is fixed. It may be.
  • the position adjusting means is a gantry that is movable relative to the eye to be examined with respect to the optical system including the laser light source, the light receiving unit, the first and second light sources, and the first and second imaging means. This is preferable from the viewpoint of performing accurate alignment with an easy operation.
  • the ophthalmic measurement apparatus of the present invention has a display unit for displaying images taken by the first and second photographing means.
  • a normal display device used for displaying images and information can be used.
  • the display unit reflects the bright spots displayed on the display unit by the reflected light (virtual image) of the light from the first and second light sources and the reflected light (real image) of the light from the laser light source. It is preferable to further display the optimum position from the viewpoint of performing an accurate and highly reproducible alignment.
  • the optimum position of the bright spot in the present invention varies depending on the measurement object and measurement site, but may be obtained as a theoretical value, or may be obtained from experience or experiment.
  • the display of the optimum position may be a mark attached on the screen or an image projected on the screen.
  • the ophthalmologic measurement apparatus of the present invention may further include a recording unit that records the light amounts of the first and second light sources and the laser light source and the image of the eye to be examined by the photographing means. With such a recording unit, the previous alignment information can be used for the next alignment, and an accurate and highly reproducible alignment can be performed.
  • a recording unit a normal storage device used for recording information can be used.
  • the calculation unit extracts the bright spot from the image of the eye to be examined, and records information on the position of the extracted bright spot image in the recording unit. Also good. Extraction of each bright spot and specification of the position in the image can be performed by a known image processing technique.
  • the ophthalmologic measurement apparatus of the present invention may further include an input unit for inputting data from the outside to the calculation unit.
  • the calculation unit associates the light amounts of the first and second light sources, the image of the eye to be examined or the position of the bright spot, and various data input by the input unit to the recording unit. It is possible to record. This makes it easier to organize and utilize the measured data for later use.
  • Various data input by the input means is not particularly limited as long as it specifies the subject and the eye. Examples of such data include the identification number of the subject and left and right display data indicating whether the subject's eye is the left or right eyeball.
  • a commercially available personal computer can be used for a part or all of the recording unit, a part or all of the arithmetic unit, and the input means.
  • the position adjusting means is a gantry
  • the information determined by the position of the gantry include left and right display data, information on whether or not the subject has reached a position where alignment is possible, and the like. By determining such information according to the position of the gantry, operations related to alignment such as alignment operations and data input can be made easier.
  • the ophthalmologic measurement apparatus of the present invention is a variety of measurements depending on the optical characteristics of the anterior segment, such as protein concentration and cell number density in the anterior chamber, obtained from scattered light when the subject's eye is irradiated with a laser beam. Can be used.
  • a combination of alignment methods and measurement methods can be selected more efficiently, and measurement with a higher degree of freedom can be performed.
  • FIG. 4 is a diagram showing an optical system used in first to third stages in measurement according to the present invention. It is a figure which shows an example of the screen displayed on a monitor in the 1st-3rd step in the measurement which concerns on this invention. It is a figure which shows an example of the screen displayed on a monitor in the 4th step in the measurement which concerns on this invention.
  • FIG. 5 is a diagram showing another example of an optical system used in the first to third stages in the measurement according to the present invention.
  • FIG. 10 is a diagram showing another example of a screen displayed on the monitor in the first to third stages in the measurement according to the present invention. It is the figure which showed the flow of the first half of the measurement by the measuring apparatus which concerns on this invention on the basis of the screen displayed on a monitor. It is the figure which showed the flow of the middle stage of the measurement by the measuring apparatus which concerns on this invention on the basis of the screen displayed on a monitor. It is the figure which showed the flow of the latter half of the measurement by the measuring apparatus which concerns on this invention on the basis of the screen displayed on a monitor.
  • the anterior ocular segment measuring apparatus in the present embodiment is fixed on a fixed base 1, a base 2 that is movably provided on the fixed base 1, and the base 2. It has a measuring unit 3 and a monitor 4 as a display unit fixed to the measuring unit 3.
  • a communication cable 5 connected to a personal computer is connected to the fixed base 1 and supports a base position detector (not shown in FIG. 1) for detecting the position of the base 2 and the face of the subject.
  • a support base (not shown) or the like is provided.
  • the gantry 2 is provided with a joystick 6 as operation means for performing various operations during movement and alignment of the gantry 2 and a screen switching button 7 for instructing switching of images displayed on the monitor 4. Yes.
  • a measurement button 8 is provided on the top of the joystick 6.
  • the measurement unit 3 includes four function buttons 9, a printer (not shown), a paper discharge port 10 for discharging a printed matter of measurement results printed by the printer, and alignment and measurement These optical systems and control systems for alignment and measurement are provided.
  • the monitor 4 is fixed to the back of the measuring unit 3 facing the subject so that the measurer can see the image while facing the subject. Yes.
  • the alignment and measurement optical system is configured so that the subject eye A is viewed from the front via the infrared LED 11 as a first light source for irradiating the subject eye A from the front and the camera lens 12.
  • a CCD 13 as a first imaging means for imaging
  • an infrared LED 14 as a second light source for irradiating light to the eye A from an oblique direction (first oblique direction) of 30 ° with respect to the eye A From the oblique direction (second oblique direction) of 60 ° with respect to the eye A on the side opposite to the infrared LED 14, the eye A to be examined through the objective lens 15, the half mirror 16, and the camera lens 17.
  • a collimating lens 19 As a second photographing means for photographing the light, a collimating lens 19, a rotatable galvanometer mirror 20, and a light projecting lens 21 for focusing light toward the eye A to be examined.
  • a collimating lens 19 As a laser light source for irradiating the eye A with the laser beam from the direction, the objective lens 15, the half mirror 16, the light receiving lens 23, the shutter 24, and the light receiving mask 25
  • a high-sensitivity light receiving element 26 as a light receiving portion for receiving light.
  • the half mirror 16 is a mirror that allows part of the light reflected or scattered in an oblique direction of 60 ° with respect to the eye A to be examined as it is and reflects part of the light toward the light receiving lens 23.
  • a perforated mirror may be used instead of the half mirror 16.
  • the light receiving lens 23 is a lens that squeezes the light reflected by the half mirror 16 toward the light receiving mask 25.
  • the high sensitivity light receiving element 26 is a photoelectric converter that transmits an electric signal in accordance with received light.
  • the alignment and measurement control system is connected to the high-sensitivity light receiving element 26, and calculates the optical characteristics of the anterior segment from the electrical signal from the high-sensitivity light receiving element 26.
  • the CCDs 13 and 18, and the calculation unit 27 are connected to each other, and a switching unit 28 as a switching unit that switches the image signal from the CCDs 13 and 18 to the monitor 4 corresponding to the on / off of the infrared LEDs 11 and 14, and the calculation And a main body memory 29 as a recording unit connected to the unit 27.
  • a gantry position detector 30, and the like are connected to the calculation unit 27.
  • the switch 28 is connected to the monitor 4.
  • the measurement unit 3 is provided with a fixation lamp 31 for fixing the line of sight of the eye to be examined and a printer 32 for printing the printed matter discharged from the paper discharge port 10.
  • the communication cable 5 is connected to an external personal computer 33.
  • An external printer 34, an external monitor 35, and a keyboard 36 as input means are connected to the personal computer 33, respectively.
  • the measurer turns on the power of the measuring device.
  • the subject places his face on the support base.
  • the gantry position detector 30 detects the movement of the gantry 2.
  • the eye A is irradiated with light from the front by the infrared LED 11, and the eye A is photographed from the front by the CCD 13 in this state, and the image is displayed on the monitor 4.
  • a virtual image of the light irradiated from the infrared LED 11 serving as a reference light source by the cornea of the eye A to be examined is displayed on the monitor 4 as a first bright spot (also a first virtual image) B.
  • the relative positions of the optical system of the measurement unit 3 and the eye A to be examined in the XY direction are adjusted. Specifically, the position of the first bright spot is adjusted so as to approach the index displayed as the target position on the monitor 4.
  • the calculation unit 27 determines that the first stage of alignment has started, and the infrared LED 11 and the fixation lamp 31 is turned on.
  • the line of sight of the subject eye A is fixed, and the anterior eye portion of the subject eye A is irradiated with infrared light.
  • the image captured by the CCD 13 is displayed on the monitor 4 by this infrared light irradiation.
  • the infrared LED 11 is turned on, a virtual image of the infrared LED 11 that is a light source is displayed on the anterior eye portion of the eye A to be examined displayed on the monitor 4.
  • An optical system for alignment in the present embodiment is shown in FIG.
  • the reflected light (first reflected light) at the anterior eye portion of the light emitted from the infrared LED 11 passes through the camera lens 12, and at this time, the lens tube of the camera lens is an aperture stop.
  • the infrared LED 11 is used as a light source for displaying a virtual image of the anterior segment on the monitor 4 and referring to it during alignment, and at the same time serves as illumination for the iris.
  • the infrared LED 11 When the infrared LED 11 is turned on, the image of the anterior segment of the eye A to be examined and the virtual image of the infrared LED 11 as the first bright spot are displayed on the monitor 4 as described above. Based on the position of the first bright spot, the positional relationship between the eye A and the optical system of the measuring unit 3 is roughly adjusted. This adjustment is performed by operating the joystick 6 to move the gantry 2. As a rough adjustment of the positional relationship between the optical system of the measurement unit 3 and the eye A, the position of the first bright spot B is in the vicinity of the index 37 provided on the monitor 4 as shown in FIG. Judgment by whether or not.
  • the measurer determines that the positional relationship in the X and Y directions between the eye A to be examined based on the first bright spot and the optical system of the measuring unit 3 has been roughly adjusted, then the coarse positional relationship in the Z direction as the second stage is then performed. Make adjustments.
  • ⁇ Second stage (rough alignment in Z direction)>
  • the relative position in the Z direction between the optical system of the measuring unit 3 and the eye A to be examined is adjusted.
  • the first stage when it is determined that the positional relationship in the XY direction between the eye A to be examined and the optical system of the measuring unit 3 can be roughly adjusted, next, while maintaining the position of the measuring unit 3 in the XY direction, The joystick 6 is operated so that the size of the first bright spot is minimized, and the relative position in the Z direction between the optical system of the measuring unit 3 and the eye A to be examined is roughly adjusted. This is because the laser light emitted from the semiconductor laser 22 is focused on the measurement point in advance when the first bright spot is displayed as the smallest in the optical system of the measurement unit 3. This is because the positional relationship of the semiconductor laser 22 is set.
  • accurate alignment is performed using laser light emitted from the semiconductor laser 22.
  • the measurement button 8 is pressed.
  • the calculation unit 27 turns on the semiconductor laser 22.
  • the semiconductor laser 22 is set to emit light with a light amount weaker than that at the time of measurement.
  • the computing unit 27 rotates the galvanometer mirror 20.
  • the laser irradiation light from the semiconductor laser 22 scans a predetermined range of the eye A to be examined.
  • the background value is measured by the high sensitivity light receiving element 26. This background value is the signal intensity in the state where the laser beam is irradiated but the scanning in the measurement area is not yet performed.
  • the reflected light (second reflected light) of the laser light E emitted from the semiconductor laser 22 by the cornea of the eye A and the reflected light (third reflected light) of the crystalline lens Pass through the camera lens 12 and form an image on the CCD 13.
  • This is observed on the monitor 4 as a second bright spot C and a third bright spot D as shown in FIG.
  • the second bright spot C and the third bright spot D are linearly extending in the horizontal direction corresponding to the scanning direction. Are displayed on the monitor 4 as bright spots.
  • the measurer positions the first bright spot B in the ring-shaped index 37, and the index 37 further includes the second bright spot C and the third bright spot in the horizontal direction (X direction).
  • the positional relationship between the eye A to be examined and the optical system of the measuring unit 3 is finely adjusted using the joystick 6 so as to be positioned between D and D.
  • the second luminescent spot C and the third luminescent spot D are respectively indexed.
  • the positional relationship between the eye A to be examined and the optical system of the measuring unit 3 may be finely adjusted by using the joystick 6 so that it is positioned on 38 and 39.
  • pressing a predetermined function button 9 allows each light source to be observed based on the corresponding data.
  • the amount of light and the positions of the indicators 37, 38, 39 on the monitor 4 may be determined.
  • the calculation unit 27 determines whether the alignment is good or not based on the difference or magnitude of the background value depending on the irradiation position of the laser beam E. If the calculation unit 27 determines that the alignment is good, for example, the blinking speed of the indicators 37, 38, and 39 Change the display color. Thereby, the measurer can confirm that it is in a measurable state.
  • ⁇ Measurement may be started automatically or manually. Further, in the case of being automatically performed (automatic measurement mode), two kinds of measurement methods can be set. One is a type that does not require operation of a measurement button. In this method, when the calculation unit 27 as a determination unit in the automatic measurement determines that the alignment is sufficiently good, the measurement is automatically started as it is. In this method, it is not necessary to manually operate the two measurement buttons 8 and the like. Further, even if the measurement button 8 is pressed by the measurer, it does not function.
  • the other is a method in which the measurement is automatically started as it is when the calculation unit 27 as the determination means determines that the alignment is sufficiently good only during the period when the measurement button 8 is operated.
  • the alignment operation is performed while the measurement button 8 is pressed, and the measurement is automatically started when the computing unit 27 determines that the alignment is sufficiently good.
  • This method requires the operation of operating the measurement button 8, but has an advantage of preventing the measurement laser from being irradiated when the measurer does not intend. It is convenient that the measurer can arbitrarily set the measurement method in the automatic measurement as described above.
  • the measurement button 8 is displayed at an appropriate timing in consideration of the blinking speed and display color of the indicator on the monitor 4 indicating that the measurer shows good alignment regardless of the determination by the calculation unit 27. Press to start the measurement. Details of the automatic measurement and manual measurement will be described later.
  • the intensity of the laser beam E emitted from the semiconductor laser 22 is increased to the intensity for measurement. Further, the calculation unit 27 displays a measurement window 40 as shown in FIG. 7 on the monitor 4 via the switch 28.
  • the measurement window 40 indicates the light receiving range of the high sensitivity light receiving element 26 determined by the opening width of the light receiving mask 25.
  • the rotation of the galvanometer mirror 20 causes the laser beam E to scan within the frame 41 in FIG. 7 including the measurement window 40, and the highly sensitive light receiving element 26 measures the scattered light F from the anterior segment.
  • ⁇ Fifth stage display of measurement results
  • the measurement result is recorded in the main body memory 29 and the measurement result is displayed on the monitor 4.
  • a predetermined function button 9 is pressed while the measurement result is displayed on the monitor 4
  • the measurement result is printed by the printer 32, and the printed matter is discharged from the paper discharge outlet 10.
  • the measurement button 8 is pressed, the state returns to the fourth stage and the measurement can be repeated.
  • the measurement of the optical characteristics of the anterior segment of the eye A is performed a plurality of times as necessary. An example of the measurement result displayed on the monitor 4 will be described later.
  • the monitor 4 displays a screen for confirming whether to record the alignment information in the fourth stage together with the measurement result data.
  • the necessity of this recording is designated by operating the function button 9.
  • the alignment information is not recorded, and only the measurement result data is recorded in the main body memory 29.
  • the measurement result data, the data related to the alignment, and the data related to the subject and the eye A are recorded in the main body memory 29 in association with each other.
  • the data related to the alignment includes the light amounts of the infrared LED 11 and infrared LED 14 recorded at the time of measurement, the first bright spot B, the second bright spot C, the third bright spot in the image displayed on the monitor 4. This is the position of each image obtained by extracting the bright spot D and the like by image processing, its luminance, and the like.
  • the data relating to the subject and the eye A to be examined includes a subject ID for identifying a subject individual, left and right eye data, and the like (see FIG. 8).
  • the data recorded in the main body memory 29 can be sent to the personal computer 33 by operating with the function buttons 9 and can be recorded with the personal computer 33.
  • the light source that illuminates the eye to be examined is switched from the front light source to the light source from the first oblique direction, and the photographing of the eye to be examined is switched from the front photographing to the second oblique direction photographing.
  • the eye to be examined is irradiated with light from the first oblique direction, and the image is displayed on the display unit, and the image is displayed on the display unit. Based on the position of the virtual image, the positions of the laser light source and the light receiving unit and the position of the eye to be examined are relatively adjusted.
  • the subject's eye irradiated with the laser light source is photographed from the second oblique direction with respect to the subject's eye, and the image is displayed on the display unit, and the scattered light of the laser beam displayed on the display unit Based on the position of the real image, the positions of the laser light source and the light receiving unit and the position of the eye to be examined are relatively adjusted. Then, the optimal positions of the second virtual image and the real image are displayed on the display unit, and the positions of the second virtual image and the real image are adjusted based on these optimal positions.
  • FIG. 9 shows an optical system for alignment by the infrared LED 14 at this time.
  • the infrared LED 14 also serves as an iris illumination light source in addition to the second virtual image light source.
  • the monitor 4 displays an image photographed by the CCD 18, that is, an image obtained by observing the eye to be examined from an oblique direction.
  • a laser beam is emitted from the semiconductor laser 22. Therefore, in the image displayed on the monitor 4, the second virtual image G by the infrared LED 18 and the real image C by the scattered light from the cornea due to the irradiation of the laser beam are displayed as bright spots.
  • the gantry 2 is moved by the joystick 6 so that the second virtual image G and the real image C are displayed at predetermined positions with respect to the indexes 42 and 38. Thereby, the positional relationship between the eye A to be examined and the optical system of the measurement unit 3 is finely adjusted.
  • the calculation unit 27 determines whether the alignment is good or not based on the difference or magnitude of the background value depending on the irradiation position of the laser beam E. If the alignment is determined to be good, for example, the indicators 38 and 42 blink. Change speed and display color. Thereby, the measurer can confirm that it is in a measurable state.
  • the optical system shown in FIG. 2 is used as it is, and it is possible to finely adjust the alignment by irradiating light from the oblique direction of the eye to be examined and observing from the oblique direction. It is.
  • FIG. 11 to FIG. 13 show the measurement flow by the ophthalmologic measuring apparatus in the present embodiment described with reference to the display on the monitor 4.
  • the switch of the ophthalmic measurement apparatus is turned on in S101. If it does so, it will progress to S102, and after the starting screen is displayed, the screen of S103 will be displayed.
  • This screen is a screen obtained by observing the eye to be examined from the front, and displays the indicators 37 to 39 shown in FIG. At the bottom of this screen, a mode selection sign and an SP sign indicating whether or not a small pupil is supported are displayed.
  • the button corresponding to these signs among the four buttons of the function button 9 the displayed function can be executed or the display can be switched (in the following description, for convenience) Therefore, for example, it is expressed as “press the SP sign button”).
  • S104 is an alignment mode selection screen. As shown in this screen, in this embodiment, four modes are prepared as alignment modes: front alignment automatic measurement mode 1, front alignment automatic measurement mode 2, front alignment manual measurement mode, and oblique alignment mode. Has been.
  • a selection branch for performing automatic measurement or manual measurement is set in advance, and the set selection branch is displayed beside each alignment mode display.
  • the front alignment automatic measurement mode 1 it is set so that automatic measurement can be performed in either the front observation state or the oblique observation state.
  • the front alignment automatic measurement mode 2 the automatic measurement is set in the front observation state, and the manual measurement is set in the oblique observation state.
  • the front alignment manual measurement mode manual measurement is set in either the front observation state or the oblique observation state.
  • the oblique alignment mode measurement is not possible in the front observation state, and manual measurement is set in the oblique observation state.
  • the examiner selects which alignment mode to perform alignment by pressing the arrow sign button displayed at the lower left of the screen.
  • the front alignment automatic measurement mode 2 is selected.
  • the Ent. Decide by pressing the sign button.
  • the button of the joystick 6 on the screen of S103 the display on the monitor 4 shifts to the screen of S105 in FIG.
  • the screen of S105 is a front alignment automatic measurement screen.
  • the eye to be examined is observed from the front, alignment is performed, and the alignment value is judged from the difference or magnitude of the background value depending on the irradiation position of the laser beam E. If it is determined that there is, automatic measurement is performed.
  • In the lower right of the screen it is displayed that it is the front alignment automatic measurement mode.
  • four signs are displayed at the bottom of the screen.
  • TOP sign for returning to the TOP screen of S103 from the left
  • auto manual sign indicating whether the automatic measurement mode or the manual measurement mode is selected
  • SP small pupil indicating whether or not the small pupil (SP) mode is set
  • the screen moves to the small pupil mode screen of S106.
  • the eye to be examined is a small pupil (the mydriatic of the eye to be examined is not sufficiently large)
  • the laser beam from the laser light source 22 may hit the iris and make measurement difficult.
  • the alignment index 37 is shifted to the right as compared with the screen of S105, and the size is increased.
  • the alignment is completed in the small pupil mode, it is possible to return to the front alignment automatic measurement screen S105 by pressing the small pupil (SP) sign button again.
  • the screen can be changed to the front alignment manual measurement screen in S107 by pressing an auto manual sign button.
  • alignment is performed in a state where the eye to be examined is observed from the front, and the measurement itself is manually performed by the examiner.
  • the front alignment automatic measurement mode 2 is selected on the alignment mode selection screen S104, it is supposed to be set to automatic measurement in the front observation state. If you want to do it, you can switch to manual measurement just by pressing the auto-manual sign button as described above. By pressing the auto manual sign button again on the front alignment manual measurement screen S107, the screen can be returned to the front alignment automatic measurement screen S105 again.
  • the screen switching button 7 on the front alignment automatic measurement screen S105 can be changed to the oblique alignment manual measurement screen S108.
  • the front alignment automatic measurement mode 2 is selected on the alignment mode selection screen S104, it is set so that manual measurement is performed in the oblique observation state. Accordingly, a message to that effect is displayed at the lower right of the screen of S108.
  • the measurement is performed manually by the examiner. That is, even if it is determined whether the alignment is good or not based on the difference or magnitude of the background value depending on the irradiation position of the laser beam E, measurement is not started unless the measurement button 8 is pressed by the examiner. .
  • the screen switching button 7 again in this state the screen returns to the front alignment automatic measurement screen S105.
  • the user can proceed to the measurement result screen S109 shown in FIG. 13 by pressing the button of the joystick 6.
  • the measurement result in which mode is displayed.
  • the mode is FAP, that is, the front alignment automatic measurement mode and the measurement result in the small pupil mode.
  • the measurement result screen of S109 If there are a predetermined number of data on the measurement result screen of S109, it is also possible to display a list of measurement results on the measurement result list screen of S110. Also in the measurement result list screen S110, the mode at which measurement was performed is displayed in the rightmost column of the list.
  • measurement can be performed from either the front observation state or the oblique observation state. Therefore, it is possible to perform alignment by an easier method according to the eye to be examined, and to proceed to measurement as it is, thereby improving the measurement efficiency.
  • automatic measurement, manual measurement, and measurement impossibility can be set for the measurement from the front observation state, and automatic measurement or manual measurement is set in advance for the measurement from the oblique observation state. be able to.
  • measurement not intended by the measurer can be prevented.
  • a measurer who does not like measurement from frontal observation which is inevitably inferior in alignment accuracy compared to oblique observation, erroneously performs measurement from frontal observation by disabling measurement from frontal observation.
  • both frontal observation and oblique observation may be set so that measurement is impossible. By doing so, it is possible to prevent a relatively strong laser beam from being accidentally irradiated during measurement of equipment operation or during demonstration.
  • this embodiment it is possible to automatically set a combination of the alignment method and the measurement method by selecting the alignment mode at the stage before alignment and measurement. As a result, it is possible to select an optimum combination of the alignment method and the measurement method with a single setting, and it is possible to perform the measurement efficiently even when the number of eyes to be examined is particularly large.

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

L'invention concerne une technologie pour des dispositifs de mesure ophtalmologique qui mesurent les caractéristiques optiques de la partie d'œil antérieur d'un œil à examiner, ladite technologie permettant à une combinaison de procédés d'alignement et de mesure d'être sélectionnés de manière plus efficace, et permettant une mesure avec un degré de liberté plus élevé. Les caractéristiques optiques de la partie d'œil antérieure d'un œil à examiner peuvent être mesurées après la sélection de l'un ou l'autre de deux modes pouvant être sélectionnés : un mode (S105) dans lequel un alignement est réalisé par rayonnement d'une lumière dans l'œil à examiner à partir de l'avant et imagerie de l'œil à partir de l'avant ; et un mode (S108) dans lequel un alignement est réalisé par rayonnement en diagonale d'une lumière dans l'œil à examiner et imagerie en diagonale de l'œil.
PCT/JP2011/059962 2011-04-22 2011-04-22 Dispositif de mesure ophtalmologique WO2012144075A1 (fr)

Priority Applications (2)

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JP2013510835A JP5864550B2 (ja) 2011-04-22 2011-04-22 眼科測定装置
PCT/JP2011/059962 WO2012144075A1 (fr) 2011-04-22 2011-04-22 Dispositif de mesure ophtalmologique

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014122966A1 (fr) * 2013-02-06 2014-08-14 株式会社 トプコン Dispositif ophtalmique
JP2018164616A (ja) * 2017-03-28 2018-10-25 株式会社トプコン 眼科装置
JP2021526409A (ja) * 2018-06-06 2021-10-07 アルコン インコーポレイティド 目に対して反射に基づいて位置付けるためのシステム及び方法
JP7519084B2 (ja) 2020-08-31 2024-07-19 株式会社トーメーコーポレーション 眼科装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001245850A (ja) * 2000-03-03 2001-09-11 Canon Inc 眼科撮影装置
JP2002119480A (ja) * 2000-10-18 2002-04-23 Nikon Corp 眼科装置
JP2007089715A (ja) * 2005-09-27 2007-04-12 Nidek Co Ltd 眼屈折力測定装置
JP2008212308A (ja) * 2007-03-01 2008-09-18 Nidek Co Ltd 眼底カメラ
JP2008278914A (ja) * 2007-05-08 2008-11-20 Topcon Corp 眼底カメラ
WO2011030426A1 (fr) * 2009-09-10 2011-03-17 興和株式会社 Dispositif de mesure ophtalmique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001245850A (ja) * 2000-03-03 2001-09-11 Canon Inc 眼科撮影装置
JP2002119480A (ja) * 2000-10-18 2002-04-23 Nikon Corp 眼科装置
JP2007089715A (ja) * 2005-09-27 2007-04-12 Nidek Co Ltd 眼屈折力測定装置
JP2008212308A (ja) * 2007-03-01 2008-09-18 Nidek Co Ltd 眼底カメラ
JP2008278914A (ja) * 2007-05-08 2008-11-20 Topcon Corp 眼底カメラ
WO2011030426A1 (fr) * 2009-09-10 2011-03-17 興和株式会社 Dispositif de mesure ophtalmique

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014122966A1 (fr) * 2013-02-06 2014-08-14 株式会社 トプコン Dispositif ophtalmique
US9693681B2 (en) 2013-02-06 2017-07-04 Kabushiki Kaisha Topcon Ophthalmic apparatus
JP2018164616A (ja) * 2017-03-28 2018-10-25 株式会社トプコン 眼科装置
JP2021526409A (ja) * 2018-06-06 2021-10-07 アルコン インコーポレイティド 目に対して反射に基づいて位置付けるためのシステム及び方法
JP7534224B2 (ja) 2018-06-06 2024-08-14 アルコン インコーポレイティド 目に対して反射に基づいて位置付けるためのシステム及び方法
JP7519084B2 (ja) 2020-08-31 2024-07-19 株式会社トーメーコーポレーション 眼科装置

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