JP2012147835A - Ophthalmologic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ophthalmologic apparatus allowing an alignment to be quickly performed.SOLUTION: This ophthalmologic apparatus includes an optometry head having optical systems 45 and 46 of an optometry section and a control means controlling a driving motor to perform the alignment. This ophthalmologic apparatus further includes an arithmetic means that finds a separation distance from the pupil of a subject's eye to an optical axis of a measuring optical system and the direction of the pupil based on the pupil image position and an alignment target position of the anterior ocular segment image displayed on a display means. The control means moves the optometry head to a found direction by the separation distance at a high speed, by the movement, when a luminescent spot image or the pupil central position of the anterior ocular segment image does not enter within a measurable area, finds the separation distance from the pupil center of the subject's eye to the optical axis of the measuring optical system and the direction of the pupil center, and moves the optometry head towards the found direction by the separation distance at a predetermined low speed.

Description

  The present invention relates to an ophthalmologic apparatus for measuring eye refractive power of an eye to be examined.

  2. Description of the Related Art Conventionally, an ophthalmologic apparatus that automatically performs alignment and then measures the eye refractive power of an eye to be examined is known (see Patent Document 1).

  Such an ophthalmologic apparatus is provided with a measurement unit that measures eye refractive power, an alignment detection unit that detects alignment of the measurement unit with respect to the eye to be measured, and the like, provided on a measurement head that is movable up and down, front and rear, and left and right with respect to a base. Provided.

  Further, this ophthalmic apparatus manually performs rough alignment in the XY direction and Z direction, and when the index image appears on the TV monitor, automatic alignment in the XY direction is performed.

  In this automatic alignment, it is determined whether or not the index image is within the allowable range of completion of alignment.When the alignment is not completed, the distance between the index image and the alignment target position is obtained, and the moving speed is determined according to this distance. The alignment is performed by moving the measuring head at the determined moving speed.

Japanese Patent No. 3676055

  However, in such an ophthalmologic apparatus, the distance between the index image and the alignment target position is obtained, and the moving speed is determined according to this distance. Therefore, it takes time corresponding to the processing operation for making this determination. As a result, there is a problem that alignment cannot be performed quickly.

  An object of the present invention is to provide an ophthalmic apparatus that can perform alignment quickly.

According to the first aspect of the present invention, an optometric unit having an optical system for inspecting or measuring the eye to be examined and an index light for detecting the alignment of the optical system of the optometric unit with respect to the eye to be examined are projected. An alignment light projection system, an imaging means for imaging the eye to be examined, a display means for displaying an anterior segment image captured by the imaging means, the optometry section, the alignment light projection system, and an imaging means. Provided optometry head, moving means for moving the optometry head left, right, up, down, and forward / backward with respect to the eye to be examined, and control for controlling the moving means to align the optical system of the optometry unit with respect to the eye to be examined An ophthalmic device comprising means,
Based on the pupil image position of the anterior segment image displayed on the display means and the alignment target position preset on the display means, from the pupil of the eye to be examined to the optical axis of the optical system of the optometry section And a calculation means for obtaining a distance of the pupil and a direction of the pupil with respect to the optical axis of the optical system of the optometry unit,
The control means controls the moving means to move the optometry head in a direction determined by the calculation means and at a predetermined high speed by a separation distance;
When the movement does not enter the measurable area where the pupil center position of the bright spot image or anterior eye image displayed on the display means is set, the calculation means Based on the pupil image center position of the partial image and the alignment target position, the separation distance from the pupil center of the eye to be examined to the optical axis of the optical system of the optometry unit, and the optical axis of the optical system of the optometry unit And the direction of the pupil center with respect to
The control means controls the moving means to move the optometry head in the direction obtained by the computing means at a predetermined low speed by the obtained separation distance.

  According to this invention, it is possible to provide an ophthalmologic apparatus that can perform alignment quickly.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows an external view of an ophthalmologic apparatus according to the present invention, wherein (a) is a side view showing a case where a display screen of a monitor unit is directed toward an examiner, and (b) is a diagram of (a). It is a rear view. (A) is a side view which shows the case where the display screen of a monitor part is orient | assigned to the subject's side, (b) is a front view of (a). (A) is the side view which turned the display screen of the monitor part to the right side, (b) is the rear view of (a). (A) is the side view which inclined the monitor part shown to Fig.3 (a), (b) is a rear view of (a). (A) is the side view which inclined the display screen of the monitor part toward the left side, (b) is a rear view of (a). It is an optical arrangement | positioning figure which showed arrangement | positioning of the optical system of an ophthalmologic apparatus. It is the block diagram which showed the structure of the control system of an ophthalmologic apparatus. It is the flowchart which showed operation | movement of the ophthalmologic apparatus. It is explanatory drawing which showed the example by which a part of anterior eye part image was displayed on the screen of a monitor part. It is explanatory drawing which showed the example in which the anterior eye part image was displayed on the screen of a monitor part. It is explanatory drawing which showed the screen of the monitor part when alignment is completed. It is explanatory drawing which showed the screen of the monitor part when a luminescent spot image came to the vicinity of alignment target position. It is explanatory drawing which showed the other example by which the anterior eye part image was displayed on the screen of a monitor part.

  Hereinafter, an embodiment as an embodiment of an ophthalmologic apparatus according to the present invention will be described with reference to the drawings.

  1 to 5, reference numeral 1 denotes an ophthalmologic apparatus. The ophthalmologic apparatus 1 is generally composed of a base portion 2, an optometry head 3, and a chin rest portion 4. The chin rest portion 4 is provided with a forehead pad 5 integrally therewith.

  The subject is inspected with the chin placed on the chin rest 4 and the forehead 5 on the forehead.

  An optometry unit 6 is provided inside the optometry head 3 as indicated by a broken line in FIG. 1A, FIG. 2A, etc., and this optometry unit 6 is a known observation and observation for photographing. A measurement optical system (optical system) for measuring an optical system and refractive power is provided. The optometry unit 6 allows the anterior eye part of the subject, the cornea of the eye to be examined, the fundus oculi, and the like to be observed and photographed, and the fundus can be examined.

  On the side of the optometry head 3 facing the subject, as shown in FIG. 2B and the like, a light source 7 for anterior segment illumination is arranged in an annular shape. This light source 7 is also used as a measurement light source for measuring the corneal shape.

  The base portion 2 is provided with a known drive mechanism / drive circuit 8 for driving the optometry head 3 as indicated by broken lines in FIG. 1 (a), FIG. 2 (a) and the like.

  For example, a pulse motor (not shown) is used for the drive unit of the drive mechanism / drive circuit 8.

  The optometry head 3 is driven in the up / down / left / right / front / rear direction with respect to the eye to be examined by operating a monitor unit described later. As shown in FIGS. 1 to 5, a liquid crystal monitor unit (display means, liquid crystal display) 10 is provided on the top 9 of the optometry head 3.

As shown in FIGS. 1 to 5, the monitor unit 10 can be freely moved to a desired position. Further, a touch panel TC (see FIG. 7) is attached to the screen H of the monitor unit 10, and various operations can be performed by touching the touch panel TC.
[Optometry section]
An example of the optical system of the optometry unit 6 is shown in FIG. The optical system is compactly arranged in a case (not shown).

  In FIG. 6, reference numeral 41 denotes a fixation target projection optical system for projecting a target on the fundus Er to fixate or cloud the eye E, 42 denotes an observation optical system for observing the anterior segment Ef of the eye E, 43 Is a scale projection optical system for projecting the aiming scale onto the CCD 44, 45 is a pattern light beam projection optical system (measurement optical system) for projecting a pattern light beam for measuring the refractive power of the eye E to be examined, and 46 is from the fundus Er. A light receiving optical system (measuring optical system) for causing the CCD 44 to receive the reflected light beam, 47 an alignment light projection system for projecting index light for detecting an alignment state in a direction perpendicular to the optical axis toward the eye to be examined, 48 Is a working distance detection optical system for detecting the working distance between the eye E and the apparatus main body (optometry head 3), and 49 is a signal processing unit. The pattern light beam projection optical system 45 and the light receiving optical system 46 constitute an optical system of the optometry unit 6.

  The fixation target projection optical system 41 includes a light source 51, a collimator lens 52, an indicator plate 53, a relay lens 54, a mirror 55, a relay lens 56, a dichroic mirror 57, a dichroic mirror 58, and an objective lens 59.

  The visible light emitted from the light source 51 is converted into a parallel light beam by the collimator lens 52 and then passes through the indicator plate 53. The index plate 53 is provided with a target for fixing the eye E to be inspected and fogged. The target light flux passes through the relay lens 54 and is reflected by the mirror 55, is guided to the dichroic mirror 57 through the relay lens 56, is reflected by the mirror 55, and is guided to the main optical axis O1 of the optical system, and the dichroic mirror. After passing through 58, it is guided to the eye E through the objective lens 59.

  The light source 51, the collimator lens 52, and the index plate 53 constitute an index unit U10. The index unit U10 projects a fixation target by a drive motor PM1 (see FIG. 7) to fix the eye E to be inspected and clouded. The optical system 41 can be moved integrally along the optical axis O2.

  The observation optical system 42 includes an illumination light source 61, an objective lens 59, a dichroic mirror 58, a relay lens 62 having a diaphragm 61 ', a mirror 63, a relay lens 64, a dichroic mirror 65, an imaging lens 66, and a CCD (imaging means) 44. Have.

  The illumination light beam emitted from the illumination light source 61 illuminates the anterior segment Ef of the eye E to be examined. The illumination light beam reflected by the anterior eye portion Ef is reflected by the dichroic mirror 58 through the objective lens 59, passes through the diaphragm 61 ′ of the relay lens 62, is reflected by the mirror 63, and then is relayed by the relay lens 64 and the dichroic mirror 65. And is guided to the CCD 44 by the imaging lens 66, and an anterior ocular segment image to be described later is formed on the imaging surface of the CCD 44.

  The scale projection optical system 43 includes a light source 71, a collimator lens 72 having an aiming scale, a relay lens 73, a dichroic mirror 58, a relay lens 62 having an aperture 61 ′, a mirror 63, a relay lens 64, a dichroic mirror 65, and an imaging lens 66. CCD 44 is provided.

  The light beam emitted from the light source 71 is converted into a parallel light beam when passing through the collimator lens 72, reflected by the mirror 63 through the relay lens 73, the dichroic mirror 58, and the relay lens 62 having a stop 61 ′, and the relay lens 64. An image is formed on the CCD 44 by the imaging lens 66 through the dichroic mirror 65. The video signal from the CCD 44 is input to the monitor unit 10 via the signal processing unit 49, and the anterior segment image Ef ′ is displayed on the monitor unit 10 and the alignment marks ALM 1 and ALM 2 are displayed. Note that the light sources 61 and 71 are turned off when measuring the refractive power after the alignment is completed.

  The alignment mark ALM1 indicates the range of the alignment completion area (measurable area), and the alignment mark ALM2 indicates the area range of the rough alignment.

  The pattern light beam projection optical system 45 includes a light source 81, a collimator lens 82, a conical prism 83, a ring indicator plate 84, a relay lens 85, a mirror 86, a relay lens 87, a perforated prism 88, a dichroic mirror 57, a dichroic mirror 58, and an objective lens. 59.

  The light source 81 and the ring indicator plate 84 are optically conjugate, and the ring indicator plate 84 and the pupil EP of the eye E are arranged at optically conjugate positions. The light source 81, the collimator lens 82, the conical prism 83, and the ring indicator plate 84 constitute an indicator unit U40, and this indicator unit U40 is driven back and forth along the optical axis O3 by the drive motor PM2 (see FIG. 7). The

  The light beam emitted from the light source 81 is converted into a parallel light beam by the collimator lens 82, passes through the conical prism 83, and is guided to the ring indicator plate 84. It passes through the ring-shaped pattern portion formed on the ring indicator plate 84 and becomes a pattern light beam. After passing through the relay lens 85, this pattern light beam is reflected by the mirror 86, passes through the relay lens 87, is reflected by the reflecting surface of the perforated prism 88, and is guided to the dichroic mirror 57 along the main optical axis Ol. After passing through the dichroic mirrors 57 and 58, an image is formed on the fundus Er by the objective lens 59.

  The light receiving optical system 46 includes an objective lens 59, dichroic mirrors 58 and 57, a hole 88a of a perforated prism 88, a relay lens 91, a mirror 92, a relay lens 93, a mirror 94, a focusing lens 95, a mirror 96, and a dichroic mirror 65. And an imaging lens 66 and a CCD 44. The focusing lens 95 is movable along the optical axis O4 in conjunction with the index unit U40.

  The reflected light beam guided to the fundus Er by the pattern light beam projection optical system 45 and reflected by the fundus Er is collected by the objective lens 59, transmitted through the dichroic mirrors 58 and 57, and the hole portion of the perforated prism 88. It is guided to 88a and passes through the hole 88a. The pattern reflected light beam that has passed through the hole 88a is transmitted through the relay lens 91, reflected by the mirror 92, transmitted through the relay lens 93, reflected by the mirror 94, transmitted through the focusing lens 95, and transmitted through the mirror 96, dichroic. The light is reflected by the mirror 65 and guided to the CCD 44 by the imaging lens 66. As a result, a pattern image is formed on the CCD 44.

  The alignment light projection system 47 includes an LED 101, a pinhole 102, a collimating lens 103, and a half mirror 104, and has a function as an alignment unit that projects an alignment index light beam toward the cornea C of the eye E. The alignment index light beam projected as parallel light toward the eye E is reflected by the cornea C of the eye E, and an alignment index image (bright spot image) T is projected onto the CCD 44 by the observation optical system 42. When the alignment index image T is positioned within the alignment mark ALM1, it is determined that the alignment is complete.

  The working distance detection optical system 48 has a function as an alignment unit that detects a working distance between the eye E to be examined and the apparatus main body (optometry head 3). The working distance detection optical system 48 has finite distance index projection systems 102R and 102L that project an index from a finite distance, respectively, symmetrically with respect to the main optical axis O1. The finite distance index projection systems 102R and 102L that project the index from the finite distance project the light beam from the light source 102a onto the eye E as an index light beam from the left and right sides.

The index light beams from these two finite distance index projection systems 102R and 102L are reflected by the cornea C of the eye E and imaged on the CCD 44 by the observation optical system 42. Based on the output from the CCD 44, the signal processing unit 49 displays the index images 102R ′ and 102L ′ by the index beam from the finite distance index projection systems 102R and 102L on the monitor unit 10. Note that the same index images as the index images 102R ′ and 102L ′ are formed on the CCD 44. When these index images have a certain positional relationship on the CCD 44, it is detected that the working distance is a distance Wo suitable for measurement.
[Signal processing section]
As shown in FIG. 7, the signal processing unit 49 includes an arithmetic control circuit (arithmetic unit, control unit) 110, an A / D converter 112, a frame memory 113, a D / A converter 114, a D / A converter 115, have.

  This arithmetic control circuit 110 has a CPU, ROM, RAM, input / output circuit, control circuit, etc. (not shown), and also serves as a drive control means for controlling the driving of each pulse motor and an arithmetic means for calculating eye characteristics. The calculation result and the like are stored in the RAM.

  The arithmetic control circuit 110 also detects the position of the pupil based on the pupil position detection means, the center position of the detected pupil or the position of the bright spot image T (see FIG. 10), and the alignment target position G. The distance between the pupil center of E and the optical axis O1 of the measurement optical system and the direction of the alignment target position G (position of the main optical axis O1 of the light receiving optical system 46) (direction centered on the pupil center position) are calculated. It has a function with a calculation means.

  The arithmetic control circuit 110 drives and controls the drive motors PM1 and PM2, and controls the drive motors (moving means) 23, 27, and 30. Thereby, the apparatus main body (optometry head 3) is driven in the X, Y, and Z directions. The arithmetic control circuit 110 is connected to a driver (not shown) in order to control lighting of the various light sources 51, 61, 71, 81, 102a and the LED 101. The drive motor 23 moves the optometry head 3 up and down, the drive motor 27 moves the optometry head back and forth, and the drive motor 30 moves the optometry head 3 left and right.

The calculation control circuit 110 calculates the light receiving positions of the alignment index image T (bright spot image) and index images 102R ′ and 102L ′ received by the CCD 44, and the distance and direction to the alignment target position G based on the calculation results. Is what you want.
[Operation]
Next, the operation of the ophthalmologic apparatus 1 configured as described above will be described with reference to the flowchart shown in FIG.

  First, a power supply (not shown) is turned on (step 1). In step 2, the subject's (patient) jaw is placed on the jaw holder 4.

  In step 3, an operation unit (not shown) is operated to turn on the illumination light source 61 of the observation optical system 42 and turn on the light source 51 of the fixation target projection optical system 41. When the illumination light source 61 is turned on, the anterior segment Ef of the eye E is illuminated. Further, the fixation target is presented to the subject by turning on the light source 51 of the fixation target projection optical system 41, and the LED 101 and the like of the alignment light projection system 47 are turned on.

  In step 4, the height of the chin rest 4 is adjusted.

  By illuminating the anterior segment by turning on the illumination light source 61 of the observation optical system 42, an anterior segment image is formed on the imaging surface of the CCD 44 of the observation optical system 42, and the anterior segment image is displayed in the frame memory 113. Is stored, and the anterior segment image is displayed on the screen of the monitor unit 10.

  Now, for example, as shown in FIG. 9, when the anterior segment image Ef ′ deviates from the screen H of the monitor 10 and the pupil image Ea ′ is hardly displayed on the screen H, the deviated pupil image Ea The position U of the screen H in the vicinity of ′ is touched (step 5).

  In step 6, it is determined whether or not a pupil has been detected. For this determination, the pupil image Ea ′ is extracted from the periphery of the position U where the screen H is touched from the image stored in the frame memory 113. If the pupil image Ea ′ cannot be extracted, the arithmetic control circuit 110 Will be judged no.

  In the case of the screen H shown in FIG. 9, since the pupil image Ea ′ cannot be extracted, it is determined NO in step 6 and the process proceeds to step 13.

  In step 13, the distance between the position U and the target position G and the direction of the target position G are obtained based on the touched position U and the alignment target position G. Then, from the distance and direction, the distance from the pupil (pupil center) of the eye to be examined to the optical axis O1 of the measurement optical system and the optical axis of the measurement optical system when it is assumed that there is a pupil image at the touch position U The direction of the pupil (pupil center) with respect to O1 is obtained. These separation distance and direction are obtained by the arithmetic control circuit 110 based on image data stored in the frame memory 113.

  In step 14, the arithmetic control circuit 110 drives and controls the drive motors 23 and 30 based on the obtained distance and direction to move the optometric head 3 at a predetermined high speed by the obtained separation distance in the direction of the alignment target position G. .

  When the pupil image Ea ′ is displayed on the screen H as shown in FIG. 10 due to the movement of the optometric head 3 by the separation distance, the pupil image Ea ′ can be extracted. Proceed to step 7. Note that the bright spot image T is displayed on the screen H when the center position of the pupil image Ea ′ is located in or near the alignment mark ALM2.

  If the pupil image Ea ′ is not displayed on the screen H, the pupil image Ea ′ cannot be extracted, so that it is determined NO in step 15 and the process returns to step 5. Until the pupil image Ea ′ is displayed on the screen H, the operations of Step 5, Step 13 to Step 15 are repeated.

  That is, when the pupil image Ea ′ is greatly deviated from the screen H, the pupil image Ea ′ cannot be put into the screen H by one touch of the screen H. 'Is put in the screen H.

  When the pupil image Ea ′ is displayed on the screen H as shown in FIG. 10, the arithmetic and control circuit 110 extracts the pupil image Ea ′.

  In step 7, based on the center position of the pupil image Ea 'and the alignment target position G, the distance and direction from the center position to the target position G are obtained, and based on this distance and direction, the pupil of the eye E to be examined is determined. The distance from the (pupil center position) to the optical axis O1 of the measurement optical system and the direction of the pupil (pupil center position) with respect to the optical axis O1 of the measurement optical system are obtained. The direction and the separation distance are obtained by the arithmetic control circuit 110 based on the image data stored in the frame memory 113.

  In step 8, the optometric head 3 is moved at a predetermined high speed in the direction obtained in step 7 by the same distance as in step 14.

  In step 9, the bright spot image T formed by the alignment light projection system 47 (see FIG. 6) is detected as shown in FIG.

  In Step 10, it is determined whether or not the bright spot image T detected in Step 11 is in the alignment mark ALM1, that is, in the alignment completion region.

  In step 11, the light source 102a of the working distance detection optical system 48 is turned on to perform Z alignment, and then the light source 81 of the pattern light beam projection optical system 45 is turned on to the fundus Er of the eye E to measure eye refractive power. The pattern light flux is projected to measure the eye refractive power, and the light source 7 is turned on to measure the corneal shape. The indicator images 102R ′ and 102L are displayed on the screen H of the monitor unit 10 by turning on the light source 102a.

  When it is determined NO in step 10, that is, as shown in FIG. 12, when the bright spot image T is not within the alignment mark ALM1, the process proceeds to step 12.

  In step 12, based on the position of the bright spot image T and the alignment target position G, the distance and direction from the position of the bright spot image T to the target position G are obtained, and based on this distance and direction, the eye to be examined is obtained. The distance from the pupil center position of E to the optical axis O1 of the measurement optical system and the direction of the pupil center position with respect to the optical axis O1 of the measurement optical system are obtained. The direction and the separation distance are obtained by the arithmetic control circuit 110 based on the image data stored in the frame memory 113. Then, the optometry head 3 is moved in the determined direction by the determined separation distance at a predetermined low speed, and the process returns to step 9.

  Until the bright spot image T enters the alignment mark ALM1, the processing operations of Step 9, Step 10, and Step 12 are repeated.

  Here, FIG. 9 illustrates the case where the pupil image Ea ′ is off the screen H of the monitor unit 10 and is not displayed on the screen H, but generally the pupil image Ea ′ is displayed on the screen H as shown in FIG. In step 5, the pupil image Ea ′ is touched. This touched position is U1.

  In step 6, it is determined that the pupil image Ea ′ is extracted from the periphery of the touch position U1 and that the pupil image Ea ′ can be extracted.

  In step 7, the center position M of the extracted pupil image Ea ′ is obtained, and based on the center position M and the alignment target position G, the separation distance from the pupil center position of the eye E to the optical axis O1 of the measurement optical system. And the direction of the pupil center position with respect to the optical axis O1 of the measurement optical system.

  In step 8, the optometry head 3 is moved at a predetermined high speed by the separation distance in the direction obtained in step 7. Even if the center position M of the pupil image Ea ′ does not enter the alignment mark ALM1 due to the movement of the optometry head 3, the eye enters the coarse alignment area, that is, the alignment mark ALM2, in the vicinity thereof.

  Therefore, the bright spot image T (which coincides with the center position M of the pupil image Ea ′) by the alignment light projection system 47 is displayed on the screen H of the monitor unit 10 as shown in FIG.

  In step 9, the bright spot image T is detected. Since this bright spot image T is not included in the alignment mark ALM 1, it is determined no in step 10 and the process proceeds to step 12.

  In step 12, based on the position of the bright spot image T shown in FIG. 12 and the alignment target position G, the separation distance from the pupil center position of the eye E to the optical axis O1 of the measurement optical system, and the light of the measurement optical system The direction of the pupil center position with respect to the axis O1 is obtained, and the optometry head 3 is moved in that direction by a predetermined distance at a predetermined low speed. Due to the low-speed movement of the optometry head 3, the bright spot image T enters the alignment mark ALM1 as shown in FIG. 11 without going too far, and the alignment is completed.

  As shown in FIG. 13, when the pupil image Ea ′ is displayed on the screen H of the monitor unit 10, if the pupil image Ea ′ is touched on the screen H, the center position M of the pupil image Ea ′ is displayed. And the alignment target position G, the distance between the pupil center position of the eye E to be examined and the optical axis O1 of the measurement optical system and the direction of the pupil center position are determined, and the optometry head 3 is determined by the calculated distance. It moves in the direction at high speed.

  When the alignment is not completed by the movement of the optometry head 3, the bright spot image T is moved to the vicinity of the alignment mark ALM1 as shown in FIG.

  Then, based on the position of the bright spot image T and the alignment target position G shown in FIG. 12, the separation distance from the pupil center position of the eye E to the optical axis O1 of the measurement optical system, and the direction of the pupil center position Since the optometry head 3 is moved at a low speed in that direction by a separation distance, the XY alignment can be completed without the optometry head 3 going too far.

  As described above, since the optometry head 3 is simply moved in the direction at a high speed or a low speed by the determined separation distance, the control process for moving the optometry head 3 can be easily performed, and complicated software is not required. For this reason, alignment can be performed quickly.

  In the above embodiment, the position of the bright spot image T is obtained in step 9, but the center position of the pupil image Ea ′ may be used instead of the bright spot image T. Moreover, although the monitor part 10 is provided in the optometry head 3, it is not limited to this, For example, you may provide in the base base etc. which do not move. The optometry unit 6 can measure the refractive power of the eye E and examine the fundus, but is not limited to these measurements and examinations, and can perform other measurements and examinations. Alternatively, only one of the measurement optical system and the inspection optical system may be provided so that either the measurement or the inspection can be performed. Further, the optometry unit includes, for example, a fundus or a corneal endothelial cell imaging device that requires alignment in addition to the examination.

  The present invention is not limited to the above-described embodiments, and design changes and additions are permitted without departing from the spirit of the invention according to each claim of the claims.

3 Optometry Head 6 Optometry Unit 23 Drive Motor (Moving means)
27 Drive motor (moving means)
30 Drive motor (moving means)
44 CCD (imaging means)
45 Patterned beam projection optical system (optical system)
46 Receiving optical system (optical system)
47 alignment light projection system 110 arithmetic control circuit (control means, arithmetic means)

Claims (4)

An optometry unit having an optical system for inspecting or measuring the eye to be examined, an alignment light projection system for projecting index light for detecting the alignment of the optical system of the optometry unit with respect to the eye to be examined, and An imaging means for imaging the eye to be examined; a display means for displaying an anterior segment image captured by the imaging means; an optometry head provided with at least the optometry section, an alignment light projection system, and an imaging means; An ophthalmologic apparatus comprising: a moving unit that moves the optometry head left, right, up, down, and forward / backward with respect to the eye to be examined; and a control unit that controls the moving unit to align the optical system of the optometry unit with respect to the eye Because
Based on the pupil image position of the anterior segment image displayed on the display means and the alignment target position preset on the display means, from the pupil of the eye to be examined to the optical axis of the optical system of the optometry section And a calculation means for obtaining a distance of the pupil and a direction of the pupil with respect to the optical axis of the optical system of the optometry unit,
The control means controls the moving means to move the optometry head in a direction determined by the calculation means and at a predetermined high speed by a separation distance;
When the movement does not enter the measurable area where the pupil center position of the bright spot image or anterior eye image displayed on the display means is set, the calculation means Based on the pupil image center position of the partial image and the alignment target position, the separation distance from the pupil center of the eye to be examined to the optical axis of the optical system of the optometry unit, and the optical axis of the optical system of the optometry unit And the direction of the pupil center with respect to
The control unit controls the moving unit to move the optometry head in a direction determined by the calculating unit at a predetermined low speed by a determined separation distance. After the optometry head is moved at a low speed, when the bright spot image displayed on the display means or the pupil image center position of the anterior segment image does not fall within the measurable area, the calculation means Based on the pupil image center position of the image or anterior eye part image and the alignment target position, the separation distance from the pupil center of the eye to be examined to the optical axis of the optical system of the optometry part, and the optics of the optometry part Determining the direction of the pupil center relative to the optical axis of the system;
The control unit controls the moving unit to move the optometry head in a direction determined by the calculation unit and at a predetermined low speed by a predetermined distance, and a pupil center position of the bright spot image or the anterior segment image is measured. The ophthalmologic apparatus according to claim 1, wherein the low-speed movement operation is repeatedly performed until entering the possible area. The display means has a touch panel,
3. The ophthalmologic apparatus according to claim 1, wherein the calculation unit obtains the separation distance and the direction when a touch panel of the display unit is touched. When the calculation means cannot detect the pupil image position, the calculation means assumes that each time the touch panel is touched, there is a pupil image at the touch position based on the touch position and the alignment target position. The distance from the pupil of the eye to be examined to the optical axis of the optical system of the optometry unit, and the direction of the pupil with respect to the optical axis of the optical system of the optometry unit,
4. The ophthalmologic apparatus according to claim 3, wherein the control means moves the optometry head at a high speed by the obtained separation distance in the direction obtained by the computing means.