JP2012192009A - Fundus photographing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fundus photographing apparatus allowing alignment as viewing a fundus observation image and an anterior ocular segment observation image together, and allowing easy confirmation of a photographic state to a subject eye.SOLUTION: The fundus photographing apparatus includes: a fundus observation optical system receiving reflected light from a fundus illuminated with infrared light to obtain the fundus observation image; an anterior ocular segment observation optical system obtaining the anterior ocular segment observation image by a second imaging element placed on an optical path divided by an optical path branch member disposed in the optical path of the fundus observation optical system; a monitor on which a fundus observation screen displayed with the fundus observation image and an anterior ocular segment observation screen displayed with the anterior ocular segment observation image are displayed; and display control means for changing over a display state of the monitor between on the fundus observation screen and on the anterior ocular segment observation screen. The display control means superposes and forms, on the fundus observation screen, a first display column formed as a display screen smaller than the fundus observation screen in a state that the fundus observation screen is displayed on the monitor, and electrically forms a reticle indicating a required pupil diameter in a prescribed position of the first display column.

Description

  The present invention relates to a fundus imaging apparatus that performs fundus imaging of a subject's eye.

  The fundus imaging apparatus includes a monitor on which an observation image and a captured image of the subject's eye are displayed, and the apparatus and the subject's eye are aligned using the anterior ocular segment observation image displayed on the monitor. In addition, after the alignment is completed, focusing is performed, and a fundus photographic image photographed by emitting a visible photographing light source in a state where the fundus is in focus is displayed on the monitor. In such a fundus imaging apparatus, the alignment and focus between the imaging unit and the subject's eye in a state where both the anterior ocular segment observation image and the fundus observation image are displayed on the monitor for easier positioning. An apparatus for performing matching has been proposed (see, for example, Patent Document 1).

JP 2000-5131 A

  However, in Patent Document 1, it is determined that the anterior ocular segment observation image is displayed so as to be superimposed on the fundus oculi observation image for easy alignment, and it is determined whether the eye state of the subject is suitable for imaging. Difficult to do.

  In view of the above-described problems of the prior art, the present invention can perform positioning while viewing both the fundus observation image and the anterior ocular segment observation image when photographing the fundus of the subject's eye, and can also capture the subject eye. It is an object of the present invention to provide a fundus imaging apparatus that can easily check the state.

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

(1) A first imaging device for receiving reflected light from the fundus of the subject's eye illuminated with infrared light, and the fundus of the subject's eye based on the light reception result of the first imaging device A fundus observation optical system for obtaining an observation image; and a second image sensor placed on an optical path divided by an optical path branching member disposed on the optical path of the fundus observation optical system, which is different from the infrared light An anterior ocular segment observation optical system that obtains an anterior ocular segment observation image of the subject's eye by receiving infrared light of a wavelength by the second imaging device, and the fundus oculi observation image obtained by the retinal observation optical system is displayed. The fundus observation screen and the anterior ocular segment observation screen on which the anterior ocular segment observation image obtained by the anterior ocular segment observation optical system is displayed, and the display state of the monitor is the fundus observation screen. Display control means for switching between the anterior ocular segment observation screen and the display control means The stage forms a first display field that is a display screen smaller than the fundus observation screen in a state where the fundus observation screen is displayed on the monitor and overlaps the fundus observation screen, and a necessary pupil necessary for imaging A reticle indicating a diameter is electronically formed at a predetermined position in the first display field.
(2) In the fundus imaging apparatus according to (1), the monitor is a monitor having a touch panel function, and the display control unit displays a plurality of icons for setting imaging conditions using the touch panel function. And controlling to display on the anterior ocular segment observation screen, and displaying the anterior ocular segment observation image with the plurality of icons turned off in the first display column.
(3) In the fundus imaging apparatus according to (2), the reticle is a first reticle indicating a normal required pupil diameter necessary for imaging, and is smaller than the first reticle and is necessary for imaging for a small pupil diameter. It is characterized by being formed from two reticles, a second reticle showing a minimum required pupil diameter.
(4) The fundus imaging apparatus according to (3) includes a split index projection optical system for projecting a pair of optically split indexes onto the fundus for focusing the fundus, and the display control unit Is characterized in that passage position information for indicating the passage position of the split indicator with respect to the pupil of the subject's eye is electronically formed in the first display field.
(5) In the fundus imaging apparatus according to (4), a notification for notifying the examiner that the display control means has detected that the split indicator formed in the first display column has been removed from the pupil. And means.
(6) In the fundus imaging apparatus according to (5), the display control unit is a second display field that is a display screen smaller than the anterior ocular segment observation screen in a state where the anterior ocular segment observation screen is displayed on the monitor. Is superimposed on the anterior ocular segment observation screen, and the split indicator necessary for focusing is displayed in the second display field.

  According to the present invention, when photographing the fundus of the subject's eye, the fundus can be positioned while viewing both the fundus observation image and the anterior ocular segment observation image, and the photographing state with respect to the subject eye can be easily confirmed. An imaging device can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of an optical system and a control system of a fundus photographing apparatus (fundus camera). The optical system includes an illumination optical system 10, a fundus observation / imaging optical system 30 for observing and photographing the fundus of the subject's eye, and a split index projection for projecting a split index (focus index) onto the fundus of the subject's eye. Optical system 40, alignment index projection optical system 50 that projects an alignment index light beam onto the anterior segment of the subject's eye, anterior segment observation optical system 60 that captures the anterior segment of the subject's eye, and the subject's eye It is comprised from the fixation target presentation optical system 70 for guide | inducing the eyes | visual_axis of this.

  <Illumination Optical System> The illumination optical system 10 includes a photographing illumination optical system and an observation illumination optical system. The photographing illumination optical system includes a photographing light source 14 that emits a visible light beam such as a flash lamp and LED, a condenser lens 15, a ring slit 17 having a ring-shaped opening, a relay lens 18, a mirror 19, and a black spot having a black spot at the center. A plate 20, a relay lens 21, a perforated mirror 22, and an objective lens 25 are included. The observation illumination optical system includes an illumination light source 11 that irradiates a light beam including near-infrared light such as a halogen lamp, an infrared filter 12 that transmits a predetermined wavelength range of near-infrared light, a condenser lens 13, and a condenser lens 13 and a ring. A dichroic mirror 16 disposed between the slit 17, an optical system from the ring slit 17 to the perforated mirror 22, a dichroic mirror (wavelength selection mirror) 24 as an optical path branching member, and an objective lens 25 are provided. The dichroic mirror 16 has a characteristic of reflecting infrared light and transmitting visible light. The dichroic mirror 24 has a wavelength characteristic that transmits a light beam having a wavelength of near infrared light from the infrared light source 11 of the observation illumination optical system and reflects infrared light from an alignment index projection optical system 50 described later. . The dichroic mirror 24 is obliquely installed so that it can be inserted into and removed from the optical path by an insertion / removal mechanism 66 including a solenoid and a cam, and is obliquely installed in the optical path when observing the fundus using the observation illumination optical system. When photographing the fundus with the illumination optical system, it is removed from the optical path.

  <Fundus Observation / Shooting Optical System> The fundus oculi observation / shooting optical system 30 includes a fundus oculi observation optical system and a fundus photographic optical system. The fundus oculi observation optical system includes an objective lens 25, a dichroic mirror 24, a photographing aperture 31 located in the vicinity of the aperture of the perforated mirror 22, a focusing lens 32 movable in the optical axis direction, an imaging lens 33, and an insertion / removal mechanism at the time of fundus photographing. 39 is provided with a flip-up mirror 34 that can be inserted and removed from the optical path. A dichroic mirror 37 having infrared reflection and visible light transmission characteristics, a relay lens 36, and a two-dimensional imaging device for observation having sensitivity in the infrared region are disposed in the optical path of the reflection mirror 34 in the reflection direction. The fundus image illuminated by the infrared light source is taken. On the other hand, the fundus photographing optical system shares the objective lens 25 and the optical system from the photographing aperture 31 to the imaging lens 33 with the fundus observation optical system. The fundus photographing optical system includes a photographing two-dimensional imaging element 35 having sensitivity in the visible range, and photographs a fundus image illuminated with a visible light source. The imaging aperture 31 is disposed at a position substantially conjugate with the pupil of the subject eye E with respect to the objective lens 25. The focusing lens 32 is moved in the optical axis direction by a moving mechanism 49 including a motor.

  When observing the fundus, the luminous flux emitted from the illumination light source 11 passes through the dichroic mirror 24, and once converges in the vicinity of the pupil of the subject eye E by the objective lens 25, then diffuses to illuminate the fundus of the subject eye E. To do. Reflected light from the fundus passes through the objective lens 25, the dichroic mirror 24, the aperture of the perforated mirror 22, the photographing aperture 31, the focusing lens 32, the imaging lens 33, the flip-up mirror 34, the dichroic mirror 37, and the relay lens 36. To form an image on the image sensor 38. On the other hand, at the time of photographing the fundus, the reflected light from the fundus illuminated by the photographing light source 14 passes through the objective lens 25, the aperture of the perforated mirror 22, the photographing aperture 31, the focusing lens 32, and the imaging lens 33, and is two-dimensional. An image is formed on the image sensor 35.

  <Split index projection optical system> The split index projection optical system 40 includes an infrared light source 41, a slit index plate 42, two declination prisms 43 attached to the slit index plate 42, a projection lens 47, and an optical path of the illumination optical system 10. A spot mirror 44 is provided obliquely. The spot mirror 44 is fixed to the tip of the lever 45 and is normally provided obliquely to the optical axis, but is retracted out of the optical path by the rotation of the shaft of the rotary solenoid 46 during photographing. The spot mirror 44 is placed at a position conjugate with the fundus of the subject's eye E. The light source 41, the slit indicator plate 42, the deflection prism 43, the projection lens 47, the spot mirror 44 and the lever 45 are moved in the optical axis direction by the moving mechanism 49 in conjunction with the focusing lens 32.

  Further, the light beam of the slit indicator plate 42 is reflected by the spot mirror 44 via the deflection prism 43 and the projection lens 47, and then passes through the relay lens 21, the perforated mirror 22, the dichroic mirror 24, and the objective lens 25. It is projected onto the fundus of the human eye E. When the fundus is out of focus, the index image of the slit index plate 42 is separated and projected in agreement when in focus. Then, split index images (split index images S1 and S2 described later) projected onto the fundus of the subject's eye E are imaged together with the fundus image by the fundus observation imaging element 38.

  <Alignment Index Projection Optical System> In the alignment index projection optical system 50, a plurality of infrared light sources are arranged on a concentric circle centered on the photographing optical axis L1, and left and right across a vertical plane passing through the photographing optical axis L1. A first index projection optical system (0 degree and 180) having an infrared light source 51 and a collimating lens 52 disposed symmetrically, and a plurality of infrared beams disposed at positions different from the first index projection optical system. A second index projection optical system having a light source 53. In this case, the first index projection optical system projects an infinite distance index on the cornea of the subject's eye E from the left and right directions, and the second index projection optical system moves the finite distance index on the cornea of the subject's eye E up and down. Project from a diagonal direction. The infrared light sources 51 and 53 emit infrared light having a wavelength range different from that of infrared light for fundus observation.

  <Anterior Eye Observation Optical System> The anterior eye observation optical system 60 includes a field lens 61 on the reflection side of the dichroic mirror 24, a mirror 62, a diaphragm 63, a relay lens 64, and a two-dimensional imaging device 65 having infrared sensitivity. Prepare. The anterior segment illuminated by the anterior segment illumination light source 58 is received by the two-dimensional imaging device 65 via the objective lens 25, the dichroic mirror 24, and the optical system from the field lens 61 to the relay lens 64. Further, the reflected light from the cornea of the alignment light beam due to the lighting of the light source of the alignment index projection optical system 50 is reflected by the dichroic mirror 24 and detected by the two-dimensional imaging device 65. As a result, the pupil shape (pupil diameter) P of the subject's eye is obtained from the anterior segment image captured by the two-dimensional imaging element 65, and the alignment state between the apparatus and the subject's eye is obtained by photographing the alignment index. Detected.

  In the vicinity of the hole of the perforated mirror 22, two infrared light sources 55 for forming an optical alignment index (working dot W1) on the cornea of the subject's eye are arranged symmetrically about the optical axis L1. Has been. The light source 55 may have a configuration in which infrared light is guided to an optical fiber having an end face disposed in the vicinity of the perforated mirror 22. The cornea-reflected light from the light source 55 is emitted from the image sensor 38 disposed at a position substantially conjugate with the fundus when the working distance between the subject's eye E and an imaging unit (apparatus body) (not shown) is appropriate. An image is formed on the imaging surface. As a result, the examiner can finely adjust the alignment using the working dots formed by the light source 55 while the fundus image is displayed on the monitor 8. The photographing unit is equipped with an optical system and a control system shown in FIG.

  <Fixation Target Presenting Optical System> The fixation target presenting optical system 70 includes a visible light source 71 such as red, a light-shielding plate in which a plurality of openings are formed, or a liquid crystal display in which the formation position of the openings is switched by display control. The fixation target switching member 72 and the relay lens 73, and the optical path of the observation optical system 30 from the flip-up mirror 34 to the objective lens 25 via the dichroic mirror 37 is shared. Thereby, the fixation target is presented at a different position with respect to the optical axis L2 by selectively arranging the opening of the fixation target switching member 72 in front of the visible light source 71, and the fundus center is photographed. The fixation target presentation position is changed between standard imaging and peripheral imaging for imaging the fundus periphery. The light beam that has passed through the fixation target switching member 72 passes through the relay lens 73, the dichroic mirror 37, the flip-up mirror 34, the imaging lens 33, the focusing lens 32, the perforated mirror 22, the dichroic mirror 24, and the objective lens 25. Then, the fundus E is projected, and the eye of the subject is fixed.

  <Control System> The control unit 80 controls various operations of the fundus imaging apparatus. The control unit 80 is connected to the above-described two-dimensional imaging elements, insertion / removal mechanisms, movement mechanisms, light sources, and the like, and for moving the fundus imaging apparatus body in the front-rear and left-right directions with respect to the subject's eyes. A joystick 4, a driving unit 6 for moving the imaging unit in which the above-described optical system and control system are provided in a three-dimensional direction with respect to the subject's eye, an anterior ocular segment image, and a fundus observation (imaging) image are provided. A monitor 8 to be displayed, a photographing switch 93 for inputting a trigger signal for starting photographing, an input switch 94 for setting various conditions, a memory 95 as a storage unit, and the like are connected. In this embodiment, a touch panel (not shown) is provided on the display screen of the monitor 8, and a touch panel function can be used. In addition to the input switch 94, various input operations can be performed by operating the touch panel. For example, it is possible to perform various settings of photographing conditions such as adjustment of the amount of photographing light and change of the lighting position of the fixation lamp. Such shooting conditions are set by touching a plurality of icons prepared (displayed) on the monitor 8 with a finger or the like. Such various icons are formed at predetermined positions on the monitor 8 screen by display control of the control unit 80.

  At the time of alignment between the subject's eye and the apparatus, the control unit 80 detects the pupil diameter P while detecting the alignment index from the anterior segment image captured by the two-dimensional imaging element 65. At this time, the center position of the pupil diameter P (pupil center) may be obtained. Further, the control unit 80 detects the alignment deviation amount of the imaging unit with respect to the subject's eye based on the imaging signal of the imaging element 65. In addition, the control unit 80 requires a pupil necessary for performing good imaging on the anterior segment observation screen 200a (see FIG. 2) of the monitor 8 on which the anterior segment image AE of the subject's eye E is displayed. A reticle LT (LT1, LT2) indicating the size of the diameter is electronically formed and displayed, and the alignment index A1 whose display position is moved according to the detected alignment deviation amount, and the alignment index A1 aiming The mark A2 used for alignment is electronically formed and displayed on the anterior ocular segment observation screen 200a.

  In the present embodiment, the input signals from the image sensor 65 of the anterior ocular segment observation optical system 60 and the image sensor 38 of the fundus oculi observation / photographing optical system 30 are simultaneously or alternately (at predetermined steps). Is configured to be input. As a result, the control unit 80 processes information from the image sensor 65 and the image sensor 38 simultaneously or alternately (in predetermined steps), and the fundus observation image and the anterior segment observation image are displayed on the monitor 8 when the fundus is focused. Can be displayed simultaneously as movies on the same screen. In the present embodiment, a display field for displaying an anterior ocular segment image superimposed on the fundus observation screen displayed at the time of focusing on the fundus is prepared. An anterior ocular segment screen on which predetermined image processing has been performed is displayed on the observation screen.

  Next, an operation of the fundus camera having the above configuration will be described. First, the examiner sets various conditions by operating the input switch 94 or a touch panel (not shown). Here, an example will be described in which imaging (standard imaging) is performed in the vicinity of the posterior pole portion of the right eye of the subject. The monitor 8 first displays an anterior ocular segment observation screen 200a. While the subject's eye is fixed by turning on the light source of the fixation target presenting optical system 70, the imaging unit (not shown) is moved closer to the subject's eye E (here, the right eye) by operating the joystick 4. The anterior eye part image AE and the alignment index image are displayed on the monitor 8.

  FIG. 2 shows an example of the anterior ocular segment observation screen 200 a displayed on the monitor 8. Here, FIG. 2A shows a state where the anterior segment image AE displayed on the monitor 8 is not aligned, and FIG. 2B shows a state where the anterior segment image AE is aligned. Has been. The anterior ocular segment observation screen 200a displayed on the monitor 8 is provided with various icons for setting various photographing conditions, and various graphics and marks for supporting photographing and alignment. For example, on the upper side of the anterior ocular segment observation screen 200a, a photographic eye display mark 81 (81a, 81b) indicating the photographic eye (right eye or left eye), and a fixation target presenting icon 82 indicating the presentation state of the internal fixation target. , A small pupil photographing icon 83 indicating whether or not the small pupil photographing mode is selected is displayed. Further, on the lower side of the display screen of the monitor 8, a first condition setting icon 84 indicating whether auto tracking is set or not, whether observation screen switching is automatically set, and the like, and a second condition setting icon 85 indicating the amount of photographing light are displayed. Is displayed. Each item indicated by the mark 81 and the icons 82 to 85 can be set and changed by an operation using the touch panel.

  On the other hand, various graphics for performing alignment between the apparatus and the subject's eye are displayed at the center of the screen of the monitor 8. First, when the alignment index image projected on the cornea of the subject's eye is detected by the image sensor 65, the control unit 80 causes the center of the ring shape formed by the index images Ma to Mh projected in a ring shape. The XY coordinates are detected as a substantially corneal apex (alignment reference position), and the alignment index A1 is displayed electronically. In addition, the control unit 80 performs alignment on the monitor 8 corresponding to a position that is set in advance in the XY direction on the image sensor 65 (for example, the intersection of the imaging surface of the image sensor 65 and the imaging optical axis L1). The mark A2 that serves as an aim is displayed electronically. The control unit 80 also has a reticle LT1 indicating a required pupil diameter required during normal imaging centered on the display position of the mark A2, and a required (minimum) pupil required in the small pupil imaging mode. The reticle LT2 indicating the diameter is displayed on the monitor 8. Further, the control unit 80 displays an indicator I1 indicating the distance in the Z direction (working distance direction) between the imaging unit and the subject's eye between the mark A2 and the reticle LT1 (LT2).

  Using the anterior ocular segment observation screen 200a as described above, the examiner performs an operation of moving the imaging unit so that the mark A2 and the alignment index A1 are aligned by operating the joystick 4. On the other hand, the control unit 80 compares the alignment index A1 and the mark A2 to obtain the displacement amount in the XY directions. Also, the distance between the infinite index images Ma and Me and the distance between the finite index images Mh and Mf are compared to determine the alignment deviation amount in the Z direction. Then, it is determined whether or not the alignment deviation amount in the three-dimensional direction satisfies a predetermined alignment allowable range so that the mark A2 and the alignment index A1 match. Since the alignment in the working distance direction is represented by an increase or decrease in the number of indicators I1 displayed on the monitor 8, the examiner has one indicator I1 as shown in FIG. 2B. In this way, alignment in the working distance direction is performed by operating the joystick 4. As described above, the examiner checks whether the pupil diameter P of the subject's eye is large enough not to be applied to the reticle LT1 in the aligned state.

  As described above, when the alignment is completed, the control unit 80 performs focusing on the fundus. By the operation of the input switch 94 by the examiner, the control unit 80 switches the display screen of the monitor 8 from the anterior ocular segment observation screen 200a to the fundus oculi observation screen 200b. Here, an example of a fundus oculi observation screen 200b displayed on the monitor 8 is shown in FIG. Here, a state where the fundus F is in focus is shown. That is, in a state where the focus index images S1 and S2 are properly detected by the image sensor 38, the focusing lens 32 is moved on the optical axis by driving the moving mechanism 45 so that the examiner matches the split indices S1 and S2. By moving it, the fundus is focused.

  In addition to the mark 81 and icons 82 to 85, various graphic displays are also prepared on the fundus oculi observation screen 200b. For example, as various graphic displays, in addition to the electronic indicator I2 indicating the match state of the split indicators S1 and S2, an electronic alignment indicator (electronic working dot) W2 displayed electronically (superimposed) While being displayed based on the amount of alignment deviation of the photographing unit 3 with respect to the human eye, a reticle M2 serving as a reference when performing alignment with the electronic alignment index W2 is displayed. In addition, indicators I3 for expressing the amount of alignment deviation in the working distance direction (Z direction) with respect to the subject's eye are displayed on the left and right sides of the reticle M2. For a detailed description of the electronic alignment index W2, refer to Japanese Unexamined Patent Application Publication No. 2007-202724.

  In addition, since the alignment on the anterior ocular segment observation screen 200a is appropriately adjusted, two optical alignment indexes W1 (optical) by the corneal reflection light formed by the light source 55 are displayed on the fundus image F of the fundus observation screen 200b. Working dot) appears. Further, here, the observation light beam is shielded by the lever 45 inserted in the optical path of the fundus illumination optical system 10, thereby forming a light shielding region 145 on the image sensor 38, and at the tip (on the optical axis) of the light shielding region 145. Optical focus index images S1 and S2 projected on the fundus are formed.

  Further, on the right side of the fundus oculi observation screen 200b, a display column 100 on which a reduced screen of the anterior ocular segment observation screen 200a is displayed by the display control of the control unit 80 is superimposed. Thus, the examiner can simultaneously observe the fundus oculi image F displayed on the fundus oculi observation screen 200b and the anterior segment image AE displayed on the display column 100 on the same screen of the monitor 8.

  By the way, since the mark 81, various icons 82 to 85, and graphics are superimposed and displayed together with the anterior eye image AE on the above-described anterior eye observation screen 200a, the anterior eye observation screen 200a is reduced and displayed as it is. When displayed in the column 100, various marks and graphic displays are also reduced in the display column 100, making it difficult to observe the anterior segment image AE in the display column 100. On the other hand, when various types of graphics prepared on the anterior ocular segment observation screen 200a are used during fundus observation, it is convenient to perform focusing while checking the alignment state.

  Therefore, in the present embodiment, by the image processing of the anterior ocular segment observation screen 200a by the control unit 80, the display field 100 displays various anterior eye segment observation screens 200a together with the display of the anterior ocular segment image AE. Of the marks and graphics, only necessary information is extracted and displayed (hereinafter referred to as the anterior segment screen 100a). In this way, the anterior ocular segment observation using the display column 100 is suitably performed, and the cause can be easily identified when focusing is not successful.

  Here, a display method of the anterior segment screen 100a displayed in the display column 100 will be described. FIG. 4 is a flowchart showing image processing steps in the display field 100. First, in step 201, the control unit 80 acquires (captures) image data of an anterior ocular segment image by photographing with the image sensor 65. Next, in step 202, the control unit 80 constructs image data that matches the display size of the display field 100 by performing a process of thinning out a part of the pixels constituting the acquired image data in a predetermined step. Display on the monitor 8. Next, in step 203, the control unit 80 selects only a specific graphic display among the mark 81, the various icons 82 to 85, and the graphic display prepared on the anterior ocular segment display screen 200a, and displays the display field 100. Are combined and displayed electronically on the anterior segment image 100a (that is, processing for removing unnecessary information such as marks and icons from the anterior segment display screen 200a during alignment). Note that the graphic display synthesized and displayed in the display column 100 is preset by the apparatus, and may be selected by the examiner by operating the input switch 94.

Then, until the completion of fundus photographing is determined in step 204, the above steps 201 to 203 are repeatedly performed, so that the anterior segment image on which a predetermined graphic display is superimposed is displayed in the display column 100 as a moving image. It will be displayed.
For example, as shown in the enlarged view of the display column 100 in FIG. 5A, the control unit 80 displays the reticle LT1 (LT2) indicating the required pupil diameter of the subject's eye on the anterior segment image AE. The anterior segment screen 100a is displayed in the display column 100. Such a reticle LT1 (LT2) is a reticle LT1 (LT2) whose size is reduced in accordance with the display magnification difference between the anterior ocular segment observation screen 200a and the display column 100. It is electronically formed at the display position of the display field 100 corresponding to the display position of the formed reticle. Thereby, the examiner can confirm whether the pupil diameter P of the subject's eye satisfies the size necessary for imaging by confirming the anterior eye portion screen 100a of the display column 100 together with the fundus image F. . As a result, photographing is performed in a state where the pupil diameter P of the subject's eye does not satisfy the required pupil diameter, thereby preventing the occurrence of photographing errors such as a fundus photographed image being acquired darkly. .

  Further, as shown in the example of FIG. 5B, the control unit 80 causes the display column 100 to display the anterior segment screen 100a in which the alignment index A1 and the mark A2 are combined and displayed on the anterior segment image AE. Anyway. Accordingly, the examiner can check the alignment state using the display field 100 together with the fundus image F, and can appropriately perform fundus imaging. Further, in order to reconfirm the alignment state, it is not necessary to perform an operation such as returning to the anterior ocular segment observation screen 200a, and the fundus photographing operation can be performed smoothly. Furthermore, since the alignment index used in the anterior ocular segment observation screen 200a is continuously used even when the fundus image F is displayed, the usability of the examiner is improved.

  In the case of peripheral photographing, the photographing light flux is easily vignetted by the pupil diameter P depending on the position where the fixation target is presented. Therefore, in the case of peripheral shooting, the display positions of the alignment indexes A1 and A2 on the anterior segment image may be corrected according to the position where the fixation target is presented. In this way, the examiner can finely adjust the alignment with high accuracy while observing the fundus image.

  Furthermore, a graphic display that is not prepared on the anterior ocular segment observation screen 200 a may be displayed on the anterior ocular segment image 100 a in the display field 100. For example, as shown in the example of FIG. 5C, the passage positions A1 and A2 of the luminous fluxes of the split indexes S1 and S2 may be displayed on the anterior segment screen 100a. For example, when one (or both) of the split indices S1 and S2 is not displayed on the fundus image F, the examiner specifies which split index S1 or S2 is missing using only the fundus image F. It is difficult. On the other hand, in photographing around the fundus, the split indices S1 and S2 are easily vignetted because the center of the cornea of the subject's eye does not coincide with the center of the pupil depending on the position where the fixation target is presented. Therefore, when the passage positions A1 and A2 of the split indicators S1 and S2 are shown on the anterior ocular segment screen 100a, the examiner finds the passage positions A1 and A2 shown on the anterior segment image together with the fundus image F and the pupil. While confirming the positional relationship, it is possible to more suitably perform focusing with the imaging unit.

  Note that the display positions of the passage positions A1 and A2 of the luminous fluxes of the split indicators S1 and S2 are obtained in advance from position information (coordinates of the image sensor 65) of the split indicators S1 and S2 with respect to the pupil (on the cornea) in the aligned state. It is obtained by storing in the memory 85. Then, the control unit 80 performs a process of displaying the passage positions A1 and A2 at the corresponding positions on the anterior segment image 100a of the display column 100 during fundus observation. As a result, the examiner can confirm the vignetting state of the split indicators S1 and S2 and the positional relationship between the split indicator and the pupil together with the fundus image F.

  In this case, the control unit 80 automatically obtains the positional relationship between the pupil diameter P of the anterior segment image and the passage positions A1, A2 of the split indicators S1, S2, and the passage positions of the split indicators S1, S2. When A1 and A2 deviate from the pupil diameter P (or when the split indicators S1 and S2 are on the iris), the operator may be notified. For example, as shown in FIG. 5C, when the passage position A1 (corresponding to the split index S1) is on the pupil P, the control unit 80 changes the display state of the passage position A1. (For example, changing the display state of shape, color, etc.). In this way, it is possible to visually indicate the vignetting position of the split indicator to the examiner in an easily understandable manner. In addition, when the pupil P and the passing positions A1 and A2 overlap, the examiner is notified that an error has occurred, for example, by displaying another message screen on the monitor 8 on the voice. Anyway. Further, the message screen may show the contents indicating the moving direction of the apparatus to the examiner so that the passing positions A1 and A2 do not overlap the pupil diameter P.

  While checking the anterior eye portion screen 100a, the examiner moves the photographing unit by operating the joystick 4 so that the split indexes S1 and S2 on the vignetting side pass through the pupil. Alternatively, the control unit 80 reflects the vignetting detection result of the passage positions A1 and A2 based on the pupil diameter P on the autotracking so that the tracking at the position where the pupil P and the passage positions A1 and A2 do not overlap is performed. To. In this manner, the information on the passage positions A1 and A2 of the split index light beam is displayed on the anterior eye portion screen 100a of the display field 100, so that the examiner can easily perform the operation while the fundus image is displayed on the monitor 8. The alignment between the apparatus and the subject's eye can be adjusted.

As described above, the examiner performs fine adjustment such as alignment if necessary while observing the fundus oculi observation screen 200b and the display column 100 (anterior eye portion screen 100a) displayed on the same screen of the monitor 8. . Then, the photographing switch 93 is pressed in a focused state. The control unit 80 drives the insertion / removal mechanism 39 and the insertion / removal mechanism 66 by the trigger signal from the photographing switch 93 to remove the dichroic mirror 24 and the flip-up mirror 34 from the photographing optical axis L1 and to display the visible light source of the fundus photographing optical system. Lights up. Reflected light from the fundus E illuminated with a visible light beam is received by the two-dimensional imaging device 35 via the objective lens 25 and the optical system from the imaging aperture 31 to the imaging lens 33. The control unit 80 stores the captured image obtained by imaging with the two-dimensional imaging element 35 in the memory 95 and performs processing for displaying the captured image of the fundus on the monitor 8.
It should be noted that the graphic displayed on the anterior segment screen 100a in the display column 100 may be selected according to the application, and the above-described graphics may be displayed in combination.

  In the above description, the example in which the anterior ocular segment screen 100a is displayed in the display column 100 when the monitor 8 displays the fundus observation screen 200b has been described. In addition to this, a display field as described above may be prepared on the anterior ocular segment observation screen 200a. In this case, a thumbnail of the fundus image is displayed in the display column, and a predetermined graphic display (graphic display for indicating a focus state by the image processing of the fundus observation screen 200b. Only an indicator indicating the like) is displayed. In this way, the examiner can simultaneously confirm the focus state of the fundus while the anterior ocular segment observation screen 200a is displayed on the monitor 8.

  In addition, when the display column 100 is selected by operating the touch panel, various screens displayed in the display column 100 are enlarged and displayed (return to the display state of the original size). As a result, the display on the monitor 8 can be easily switched between the anterior ocular segment observation screen and the fundus oculi observation screen. When various screens are displayed in an enlarged manner, the control unit 80 displays various marks and graphic displays prepared in advance on the various screens. In this way, the examiner can easily switch the display screen of the monitor 8 according to the application, and the usability is improved.

  Furthermore, the magnification of each observation image displayed in the display field 100 may be arbitrarily changed. For example, when the magnification of the observation image displayed in the display field 100 is changed by an operation of the touch panel by the examiner, the control unit 80 configures an image that forms an observation image obtained by the image sensor 65 or 38 according to the input signal. Among the data, the image data of the observation image corresponding to the magnification is reconstructed. At this time, various graphic displays displayed in the display column 100 together with the observation image are switched to a display state corresponding to the graphic display. Thereby, the display state of the display column 100 can be more easily seen.

It is a schematic block diagram of the optical system and control system of a fundus imaging apparatus. It is an example of the anterior ocular segment observation screen displayed on a monitor. It is an example of the fundus oculi observation screen displayed on the monitor. It is a flowchart which shows the image processing step of a display column. It is an enlarged view for demonstrating a display column.

8 Monitor 10 Illumination optical system 24 Dichroic mirror (optical path branching member)
DESCRIPTION OF SYMBOLS 30 Fundus observation / imaging optical system 40 Split index projection optical system 35, 38, 65 Two-dimensional image sensor 50 Alignment index projection optical system 60 Anterior ocular segment observation optical system 70 Fixation target presentation optical system 80 Control unit

Claims (6)

A first imaging device for receiving reflected light from the fundus of the subject's eye illuminated with infrared light, and a fundus observation image of the subject's eye is obtained according to a light reception result of the first imaging device; A fundus observation optical system,
A second imaging element placed on an optical path divided by an optical path branching member disposed on the optical path of the fundus oculi observation optical system, and infrared light having a wavelength different from that of the infrared light; An anterior ocular segment observation optical system that receives light from the element and obtains an anterior ocular segment observation image of the subject's eye;
A fundus observation screen on which the fundus observation image obtained by the fundus observation optical system is displayed and an anterior eye observation screen on which the anterior eye observation image obtained by the anterior eye observation optical system is displayed. A monitor,
Display control means for switching the display state of the monitor between the fundus observation screen and the anterior ocular segment observation screen;
With
The display control means forms a first display column that is a display screen smaller than the fundus observation screen in a state where the fundus observation screen is displayed on the monitor, and is necessary for photographing. A fundus photographing apparatus characterized in that a reticle indicating a required pupil diameter is electronically formed at a predetermined position in the first display field. The fundus imaging apparatus according to claim 1, wherein the monitor is a monitor having a touch panel function.
The display control means performs control to display a plurality of icons for setting photographing conditions on the fundus observation screen and the anterior ocular segment observation screen using the touch panel function, and the first display field includes the plurality of icons. The fundus imaging apparatus is characterized in that the anterior ocular segment observation image is displayed with the icon disappeared. 3. The fundus imaging apparatus according to claim 2, wherein the reticle is a first reticle indicating a normal required pupil diameter required for imaging, and a minimum diameter required for imaging for a small pupil diameter, which is smaller than the first reticle. A fundus imaging apparatus, comprising: a second reticle indicating a required pupil diameter; and two reticles. The fundus imaging apparatus according to claim 3 comprises:
A split index projection optical system for projecting a pair of optically split indexes on the fundus for focusing the fundus; and
The fundus imaging apparatus, wherein the display control means electronically forms passage position information for indicating a passage position of the split indicator with respect to a pupil of a subject's eye in the first display field. The fundus imaging apparatus according to claim 4,
Fundus photography, comprising: an informing means for informing the examiner that the display control means has detected that the split indicator formed in the first display field is out of the pupil. apparatus. The fundus imaging apparatus according to claim 5 comprises:
The display control unit forms a second display field that is a display screen smaller than the anterior ocular segment observation screen in a state where the anterior ocular segment observation screen is displayed on the monitor so as to overlap the anterior ocular segment observation screen. In addition, the split fundus index required for focusing is displayed in the second display field.