JPS6122568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to ophthalmological instruments, and is particularly suitable for devices for testing visual fields.

In recent years, visual field testing has begun to be considered important in the field of ophthalmological clinical examinations, and it has become easy to test. The visual field testing methods currently in use range from testing the visibility limit, width, and degree and shape of a single optotype to expressing the degree and distribution of light sensitivity of each part of the retina, the height of sensitivity, etc. It is progressing in that direction. When discussing the minute parts of the retina in this way, it is necessary to accurately correspond to the actual fundus of the eye. Conventionally, the relationship between the test result and the actual part of the fundus has been estimated based on the isopter recorded on paper, but this is just an estimate and its accuracy is not guaranteed.

In addition, when testing, the subject is asked to fixate their gaze on the fixation object, and the test is carried out in that state. It is called macular. However, the part to be gazed at is not constant when there is eccentric fixation, and it is also possible that the subject takes his eyes off the fixation object, so it is desirable to be able to easily check this.

The purpose of the present invention is to enable accurate correspondence between test results and the fundus of the examinee, and the present applicant has filed an invention to achieve the same purpose as Japanese Patent Application No. 120414/1982. Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the invention. In the figure, E is the eye to be examined and Ef is the limit (retina). Also 1
is a tungsten lamp as an illumination light source, 2 is a condenser lens, 3 is a strobe tube as a photography light source, 4 is another condenser lens, and 5 is a mirror for bending the optical path. Reference numeral 6 designates a ring-shaped slit which, in cooperation with the diaphragm 10, implements a well-known fundus illumination method that does not cause corneal reflection. Note that the lamp 1 is conjugate with the ring-shaped slit 6 with respect to the condenser lenses 2 and 3.

Next, 7 and 8 are relay lenses, 9 is a perforated mirror with an aperture in the center, 10 is an aperture that limits the observation and photographing light flux, 11 is an objective lens, and the ring-shaped slit 6 and perforated mirror 9 are The ring-shaped slit 6 is substantially conjugate with respect to the relay lenses 7 and 8, and the ring-shaped slit 6 is substantially conjugate with respect to the relay lenses 7 and 8, the perforated mirror 9 and the objective lens 1.
1, it is assumed to be almost conjugate with the iris of the eye E to be examined.

Reference numeral 12 denotes an imaging lens group which has the function of re-forming the fundus image formed by the objective lens 11, and the image at that time is 13. If a film is placed on this image plane 13, a photograph of the fundus can be taken.

15 is a diagonal mirror that is raised out of the optical path when taking pictures. A field lens 16 is provided near the image 13' which is conjugate with the image with respect to the oblique mirror 15.

Reference numeral 17 denotes a semi-transparent mirror, 18 an imaging lens, and 19 a photographing tube, in which the image 13' and the photographed image of the imaging tube 19 are arranged conjugately with respect to the semi-transparent mirror 17 and the imaging lens 18. The image pickup tube used also has sensitivity in the infrared region. 20 is a monitor for displaying on a cathode ray tube.

F is an infrared filter inserted between the lamp 1 and the condenser 2, which has the function of passing infrared light and blocking visible light, and can be attached or detached as necessary.

Furthermore, 21 is a lamp, and 22 is a light-shielding plate provided with a small circular hole.These constitute a fixation light source, and are movable left and right in the drawing as well as in a direction perpendicular to the drawing.

23 is a color filter that provides beams of different colors depending on the purpose. Reference numeral 24 denotes a projection lens which has the function of focusing the light beam emitted from the fixation light source onto the image 13'.

Next, 30 is a movable index, which is movable in a plane perpendicular to the drawing as well as in the vertical direction within the drawing. The moving indicator 30 consists of a lamp 31 and a light-shielding plate 32 with a minute hole, and the minute hole is illuminated by the lamp 31 and emits a visible stimulation beam for stimulating the fundus of the eye. This beam may also be colored with a color filter.

33 is a semi-transparent mirror, which is installed diagonally in the illumination optical path and reflects the stimulation beam.

Reference numeral 34 denotes a storage means, which is coupled to the moving indicator 30 and can move in parallel within a plane together with the indicator 30.

35 is a support member, 36 is a pin that passes through the support member and has a sharp tip, 37 is a push button attached to the end of the pin, and 38 is a coil spring that keeps the button 37 apart from the support member 35 at all times. Reference numeral 39 denotes a recording paper, which is conveniently made of a thin metal lined with paper so as not to block light and not to block the drilled pin holes, and this recording paper is fixed to the main body under tension.

Reference numeral 40 is a lamp that illuminates the recording paper, so the operator presses the button 37 and uses the pin 36 to illuminate the recording paper 39.
If a hole is made in the hole, the light beam will emerge from this hole as a recording beam.

Reference numeral 41 denotes an infrared filter, which is attached during observation and removed from the optical path when photographing.

Reference numeral 42 denotes a semi-transparent mirror, which is installed obliquely in the illumination optical path and guides the recording beam. 43 is another semi-transparent mirror, perforated mirror 9
and the objective lens 11, and 44 is a concave reflecting mirror. The reflecting mirror 44 has a concave spherical surface to provide the effect of a field lens. Note that it is preferable to use the above semi-transparent mirror as a thin film mirror (pellicle mirror), and it is particularly desirable that the semi-transparent mirror 43 be a thin film mirror.

Here, the optical path length from the semi-transparent mirror 42 to the recording paper 39 is set equal to the length of the reflected optical path by the semi-transparent mirror 33 measured from the semi-transparent mirror 42 to the light shielding plate 32.
Relay lens 8, perforated mirror 9, and semi-transparent mirror 4
The recording paper 39 and the concave mirror 44 are conjugate with respect to the reflecting surface of 3, and the moving index 30 and the fundus are conjugate with respect to the reflecting surface of the relay lens 8, the perforated mirror 9, and the objective lens 11.
Ff is conjugate.

Here, a moving index 30, a semi-transparent mirror 33 (luminous flux reflection), a semi-transparent mirror 42 (luminous flux transmission), a relay lens 8,
The perforated mirror 9, the semi-transparent mirror 43 (light beam transmitting), the objective lens 11, and the oblique mirror 15 constitute a first projection means.

Further, the objective lens 11 and the imaging lens group 12 constitute a second projection means. Additionally, a moving index 30 and a semi-transparent mirror 3
3 (luminous flux reflection), semi-transparent mirror 42 (luminous flux transmission), relay lens 8, perforated mirror 9, semi-transparent mirror 43 (luminous flux reflection), concave reflecting mirror 44, semi-transparent mirror 43 (luminous flux reflection),
The imaging lens 12 and the oblique mirror 15 constitute a third projection means.

Also, an infrared filter 41, a semi-transparent mirror 42 (luminous flux reflection), a relay lens 8, a perforated mirror 9, a semi-transparent mirror 43
(for light flux reflection), the concave reflecting mirror 44, the semi-transparent mirror 43 (for light flux reflection), the imaging lens 12, and the oblique mirror 15 constitute a fourth projection means.

Next, we will discuss the effect. The subject is placed in a predetermined position, the lamps 1, 21, 31, and 40 are turned on, and the television set is driven. Only the inner infrared component of the radiation emitted by the lamp 1 passes through the filter F and is passed through the condenser lens 2 and condenser lens 3.
After passing through the slit, the image of the slit is formed on the perforated mirror 9 by the relay lenses 7 and 8 and reflected there, and the image is reflected by the objective lens 11. After forming an image near the pupil of the optometrist E, the fundus Ef is illuminated.

The infrared flux reflected from the fundus exits the eye E and enters the objective lens 11, and after converging once, the aperture 1
0 and is subjected to a converging action by the imaging lens group 12,
Passes through the semi-transparent mirror 36, is reflected by the oblique mirror 15, and becomes the image plane 1
After passing through the field lens 16 and being reflected by the semi-transparent mirror 17, the image is formed on the imaging surface 19 by the imaging lens 18. Therefore, the fundus image is displayed on the monitor 20, but if the fundus image is blurred, for example, the imaging lens group 12 is finely adjusted to focus.

The light beam emitted from the fixation light source passes through the filter 23 to become a colored light beam, is converged by the imaging lens 24, enters the semi-transparent mirror 17, and is separated into transmitted light and reflected light. The transmitted light forms an image on the image plane 13' via the field lens 16, is reflected by the oblique mirror 15, passes through the semi-transparent mirror 36, enters the imaging lens group 12, and after passing through the aperture 10, is once An image is formed, and then an image is formed on the fundus of the eye by the objective lens 11 and visually recognized by the subject.

If the fixation light source is moved here, the subject's line of sight can be guided in a desired direction, but in this case, the subject's line of sight is fixed on the light source so that the line of sight is aligned with the optical axis.

On the other hand, the stimulation beam emitted from the moving index 30 is reflected by the thin glasses 33, passes through the thin glasses 42, enters the relay lens 8, is converged by this lens, and then is reflected by the reflecting surface of the perforated mirror 9. reflected by the thin film mirror 43
The light passes through the object lens 11, converges on the image forming surface of the objective lens 11, and then diverges.The objective lens 11 turns the light into a substantially parallel light beam, which enters the subject's eye and converges on the fundus of the eye. visually confirm.

Also, the part of the stimulation beam that is reflected by the thin film mirror 43 is then reflected by the concave mirror 44 and travels backwards, and is reflected again by the thin film mirror 43 and passes through the perforated mirror 9 and the aperture of the diaphragm 10, and then reaches the final result. It is converged by the image lens group 12,
It is reversely tilted by the flip-up oblique mirror 15 and once converged onto the image plane 13'. The beam then diverges, is emitted by the semi-transparent mirror 17, and is converged by the imaging lens 18 onto the light-receiving surface of the imaging tube 19, so that the image of the moving index 30 is displayed on the display surface of the monitor 20, superimposed on the fundus image. Ru.

One way to test visual function is to perform the test along the radial direction extending radially at equal angles from the position of the optical axis X. For example, by moving the movable indicator 30 downward from above the optical axis , the subject visually observes the indicator moving.

At that time, ask the subject to give a signal when the indicator is no longer visible, and when the signal is given, fix the indicator, press the button 37, and use the pin 30 to place the recording paper
Drill a hole at 9. The position where this hole is made corresponds to the part where the index on the fundus becomes invisible, and that part is memorized. When you release your finger from button 37, pin 36
moves away from the recording paper 39, and the moving indicator becomes movable again.

Further, from the recording beam emitted from a hole made on the recording paper 39, only an infrared beam is extracted by an infrared filter 41, reflected by a thin film mirror 42, and passed through a relay lens 8 and a mirror surface of a perforated mirror 9. It is reflected by the thin film mirror 43. Furthermore, this beam is reflected by the concave mirror 44, reflected again by the thin film mirror 43, passes through the perforated mirror 9 and the aperture of the diaphragm 10, and then passes through the imaging lens group 12 and the flip-up diagonal 1.
5. The light reaches the image pickup tube 19 through the field lens 16, semi-transparent mirror 17, and image pickup lens 18, so a light spot appears on the cathode ray tube, and even after moving the moving index, it is difficult to see where the eye has finished the examination. Only the operator can know.

As described above, once the inspection in one radial direction is completed, move the moving mark along the adjacent radial direction, and when the signal is given, fix the moving mark and start the process of making a hole in the recording paper. By repeating this over the entire circumference, isopters are formed on the recording paper 39. At that time, if you print a radial meridian and a concentric angle scale on recording paper, you can use it as an isopter in itself, but it is much easier to know which part of the fundus corresponds accurately to the test results. It is effective for

In the present invention, after the isopter is formed, it is possible to superimpose the isopter on the fundus image, and for this purpose, flip up the oblique mirror 15, remove the filter 41, open the shutter (not shown), and open the strobe tube. When emitted, the luminous flux in the visible range illuminates the fundus of the eye. The reflected light from the illuminated fundus passes through the objective lens 11, the perforated mirror 9, the aperture 10, and the imaging lens 12 to expose the film 13, but at the same time, the light beams from the many small holes made in the recording paper 41 pass through the thin film. The light is reflected by the mirror 42 and passes through the mirror surface of the perforated mirror 9, the thin film mirror 43, the concave mirror 44, the double thin film mirror 43, the aperture, and the imaging lens 12 to expose the film 13. As a result, isopters are imprinted on the fundus photograph. It is better to turn off the lamp 31 of the moving index 30 when photographing.

It goes without saying that the proportion relationship between the image formed on the film and the fundus, and the proportion relationship between the isopter image and the isopter of the recording paper must be adjusted accurately.
On the other hand, the function of the infrared filter 41 is to prevent the subject from seeing the isopter during the examination, and the infrared filter is removed when photographing with visible light. If you use an infrared film, you can fix the infrared filter.

Next, in FIG. 1, 21 to 23 are means for providing background illumination, and they do not necessarily need to be provided at these positions. 21 is a semi-transparent mirror installed obliquely in the optical path, 22 is a light source whose light intensity can be changed, and 23 is a diffuser plate. The light emitted from the diffuser plate passes through a field lens 16,
It serves to illuminate the fundus uniformly through the oblique mirror 15, the semi-transparent mirror 36, the imaging lens group 12, the diaphragm and the objective lens 11. It is also possible to use a motor to feed the moving index, or to use an electromagnetic device to push the pin 36 and have the subject turn on an electric switch to make the hole.

FIG. 2 shows another embodiment in which the stimulation beam is irradiated onto the eye to be examined through a mirror provided in front of the objective lens 11, and the beam from the recording paper is not passed through an infrared filter even during observation. It is designed so that it cannot be seen by the examinee.

In the drawings, the same members as those in the embodiment shown in FIG.
Same as the figure. 50 is a semi-transparent mirror like a thin film mirror,
It is installed obliquely just in front of the objective lens 11. 51 is a projection lens, and it is convenient to use the same one as the objective lens. Further, a light-shielding plate 32 provided with a minute aperture serving as an index for inspection is arranged to be conjugate with the fundus Ef with respect to the reflective surfaces of the projection lens 51 and the semi-transparent mirror 50.

52 is a positive lens, and the recording paper 3 is connected to this lens 50, the objective lens 11, and the imaging lens group 11.
9 is arranged conjugately with the film 13. Incidentally, the side surface of the positive lens 52 of this recording paper 39 is given appropriate reflectivity, so that a part of the stimulation beam transmitted through the semi-transparent mirror 50 is reflected.

Next, the movement indicator 30 and the support member 35 are interlocked by a mechanism not shown, and when displacing in the horizontal direction in the drawing, the indicator 30 and the support member 35 are displaced in opposite directions, and when displacing perpendicular to the drawing, they are moved in the same direction. An interlocking mechanism is configured for displacement.

With the above configuration, the stimulation beam emitted from the moving index 30 becomes approximately parallel light at the projection lens 51, is split into reflection and transmission by the semi-transparent mirror 50, and the reflected beam enters the eye E to be examined and forms an image on the fundus Ef. and is visible to the test subject.

On the other hand, the beam transmitted through the semi-transparent mirror 50 is once converged on the recording paper 39 by the positive lens 52 and reflected there, and is reflected by the positive lens 52, the reflective surface of the semi-transparent mirror 50, the objective lens 11, the imaging lens 12, and the image forming lens 12. Raised diagonal mirror 1
5. The moving target image passes through the field lens 16, the mirror 17, and the imaging lens 18, and then reaches the imaging tube 19, so that the moving index image is displayed on the cathode ray tube of the monitor 20, superimposed on the fundus image.

After inspecting one direction by moving the movement indicator 30, press the push button 37 to remove the recording paper 39.
hole and then inspect along another radius. Since the recording paper 39 is illuminated by the lamp 40, a light beam is emitted from the hole made in the recording paper. This recording beam is reflected by the semi-transparent mirror 50, passes through the objective lens 11, and then reaches the image pickup tube 19, where it is displayed on the blank tube. Note that the recording beam that has passed through the semi-transparent mirror 50 is directed toward the projection lens 51, so that it does not enter the eye to be examined.

FIG. 3 is a modification of the embodiment shown in FIG. In the figure, reference numeral 55 denotes a semi-transparent mirror such as a thin film mirror, which is installed obliquely on the optical axis between the objective lens 11 and the imaging lens group 12. 56 is a reflecting mirror, 57 is a relay lens, 58 is a second relay lens, and 59 is a concave mirror. The movement index 30 and the fundus Ef are conjugate. The stimulation beam emitted from the index 30 is reflected by a reflecting mirror 56 and once formed into an image by a relay lens 57, and then transmitted through a semi-transparent mirror 55 and converged onto a concave mirror 59 by a relay lens 58. Next, the beam reflected by the concave mirror 59 is converged by the relay lens 58, reflected by the semi-transparent mirror 55, and formed into an image.
An image is formed on the fundus of the eye via the objective lens 11. On the other hand, the beam reflected by the semi-transparent mirror 55 is transmitted to the imaging lens group 12,
The light passes through the flip-up oblique mirror 15, the field lens 16, the reflecting mirror 17, and the imaging lens 18, and then converges on the light-receiving surface of the imaging tube 19, so that the image of the moving index is displayed on the cathode ray tube, overlapping the fundus image.

Also, 60 is a reflecting mirror, 61 is a semi-transparent mirror, and the index 30
The optical path length from the recording paper 39 to the relay lens 57 via the reflecting mirror 60 and the semi-transparent mirror 61 is equal to the length from the recording paper 39 to the relay lens 57 via the reflecting mirror 56.
Set the optical path length up to. The recording beam emitted from the hole drilled in the recording paper 39 passes through the infrared filter 41, passes through the semi-transparent mirror 61, is reflected by the reflective surfaces of the reflecting mirror 60 and the semi-transparent mirror 61, and enters the relay lens 57. There, the light is subjected to a convergence action and converges once, then is reflected by the semi-transparent mirror 55, passes through the imaging lens group 12, and then enters the image pickup tube 19. however,
The recording beam transmitted through the semi-transparent mirror 55 reaches the subject's eye via a relay lens 58 and a concave mirror 59, but is not visible to the subject because it passes through an infrared filter.

After forming the isopter on the recording paper 39, the infrared filter 41 is removed and the recording beam is applied to the film 1.
At the same time, the strobe tube 3 is made to emit light to illuminate the fundus Ef, and the film 13 is exposed with the reflected light.

FIG. 4 shows another modification. In the drawings, the same members as in the previously described embodiments are given the same numbers. On the other hand, 63 is a semi-transparent mirror, 64 is a relay lens, 65 and 66 are semi-transparent mirrors, 67 is a relay lens, 68 is a diaphragm, and 69 is a concave mirror. Transparent mirror 6
5, and the recording paper 39 is arranged so as to be conjugate with the image plane 13' with respect to the semi-transparent mirror 63.
Place it conjugate with 0.

Further, the relay lens 67 and the concave mirror 69 are arranged so that the image plane 13' and the concave mirror 69 are conjugate with respect to the relay lens 67, and S is a shutter.

Here, the stimulation beam emitted by the moving index 30 is reflected by the mirror surface of the semi-transparent mirror 63 and enters the relay lens 64, where it is subjected to a convergence effect. This beam is reflected by the semi-transparent mirror 65, converges near the field lens 16, and then diverges, enters the semi-transparent mirror 66, where a part is reflected and the rest is transmitted. Aperture of perforated mirror 9 and objective lens 10
The light reaches the subject's eye E through the process and is visually recognized by the subject. On the other hand, the transmitted beam is once converged on the concave mirror 69 by the relay lens 67, reflected there, subjected to the converging action again by the relay lens 67, transmitted through the semi-transparent mirror 66 and converged, and then transferred to the field lens 16 and the semi-transparent mirror 6.
5. The light enters the light-receiving surface of the imaging tube 19 via the reflecting mirror 17 and the imaging lens 18, and is displayed on the cathode ray tube 20 as an image of the moving index 30 together with the fundus image illuminated by the observation light source.

Next, the recording beam from the recording paper 39 punctured by the pin 36 passes through an infrared filter 41, further passes through a semi-transparent mirror 63, is converged by a relay lens 64, and passes through a semi-transparent mirror 65 into an image 13. ' After converging once, it passes through the semi-transparent mirror 66 and reaches the relay lens 67.
The light converges onto the concave mirror 69, is reflected there, is converged again by the relay lens 67, and is separated into transmission and reflection by the semi-transparent mirror 67. Here, the reflected beam has the effect of forming an isopter image on the film 13 during photographing, and the transmitted beam has the effect of forming an isopter image on the film 13.
6, semi-transparent mirror 65, reflecting mirror 17 and imaging lens 1
8 and reaches the image pickup tube 19, so that an isopter image is displayed on the cathode ray tube. Note that, although the portion of the recording beam reflected by the semi-transparent mirror 66 reaches the subject, it is not visible because the beam is in the infrared wavelength range.

FIG. 5 shows another embodiment. The same members as in the previously described embodiments are given the same numbers, and 70 is a reflective surface, 71 is a relay lens, 72 is a semi-transparent mirror, 73 is a roof-type prism, and 74 is a semi-transparent mirror. Figure 6 shows a roof-type prism; a shows the view from above, b shows the view from the side, and c shows the view from the right side. This prism reverses the light flux in the direction perpendicular to the drawing. It is arranged for the purpose of

The moving index 30 includes a reflecting mirror 70 and a relay lens 7.
1. Reflective surface of roof prism 73, semi-transparent mirror 74,
The fundus of the eye regarding the imaging lens group 12 and the objective lens 11
Arrange it so that it is conjugate with Ef. However, this includes two imaging steps in the optical path.

On the other hand, 75 is a field lens, 76 is a relay lens, and 77 is a semi-transparent mirror. It is conjugate with film 13. However, the field lens 75 shall be arranged so as to coincide with the intermediate image forming position, and the above conjugate relationship is the same as that of the flip-up oblique mirror 15.
Assume that it is jumping up.

Next, 78 is a semi-transparent mirror. The recording paper 39 is arranged conjugately with the film 13 with respect to the reflective surface of the semi-transparent mirror 78, the reflective surfaces of the relay lens 71, the semi-transparent mirror 72, the relay lens 76, and the reflective surfaces of the semi-transparent mirror 77, and the field lens 75 is placed at an intermediate imaging position. Allocate.

The moving indicator 30 and the support member 35 are coupled and can be moved together in the direction perpendicular to the drawing and in the left and right directions,
The stimulation beam emitted from the moving index 30 is reflected on the reflective surface 70.
It is reflected by the semi-transparent mirror 78 and passes through the relay lens 7.
1, and after being converged by this lens 71, it is split into reflection and transmission by a semi-transparent mirror 72. Semi-transparent mirror 72
The beam transmitted through the roof-shaped prism 7 converges.
3, is reflected by the roof surface, reversed left and right, and exits from the prism. This beam is reflected by the semi-transparent mirror 74, passes through the imaging lens group 12 and the objective lens 11, enters the subject's eye E, and forms an image on the fundus Ef, so that the moving index is visually recognized by the subject. The remaining beam reflected by the semi-transparent mirror 72 converges on the field lens 75, passes through the relay lens 76, the reflecting surface of the semi-transparent mirror 77, the flip-up oblique mirror 15, the field lens 16, the reflecting mirror 17, and the imaging lens 18, and then enters the imaging tube 19.
The image is formed on the light receiving surface.

Further, the beam emitted from the perforated recording paper 39 passes through the infrared filter 41, is reflected by the semi-transparent mirror 78, and enters the relay lens 71, where it is subjected to a convergence effect. Next, this beam is split into reflected and transmitted light by a semi-transparent mirror 72, and the transmitted light reaches the subject's eye, but is not visible to the subject because it passes through an infrared filter. On the other hand, the beam reflected by the semi-transparent mirror 72 converges on the field lens 75, and then passes through the relay lens 76, the reflecting surface of the semi-transparent mirror 77,
It reaches the imaging tube 19 via the flip-up oblique mirror 15, field lens 16, reflecting mirror 17, and imaging lens 18.

When photographing, the oblique mirror 15 is raised, the infrared filter is removed, and the strobe tube 3 is emitted to illuminate the fundus Ef. The film 13 is then exposed.

Although not described as an example, the light beam for imprinting the isopter on the film can also be guided from the back surface of the film.

According to the present invention described above, since the fundus reflectance is extremely small when attempting to observe and project the index image projected onto the fundus, it is difficult to observe and photograph the index image unless the index light source intensity is increased above the fundus illumination light. On the other hand, if the intensity of the index light source is increased, the subject's eye will constrict, making measurement itself impossible. It also disappears. In addition, it is extremely convenient during the examination because it is possible to irradiate the next beam while checking the area that has already been irradiated with the stimulation beam, and it is also useful when making a diagnosis because the examination results can be recognized by superimposing them on the actual fundus. This can improve accuracy. On the other hand, since the memorized information is not sent to the subject, there is no need to worry about the visible markings of areas that have already been inspected, making this device an effective device for practical use.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention. FIG. 2 is a side sectional view showing another embodiment. FIG. 3 is a side sectional view showing another embodiment. FIG. 4 is a side sectional view showing another embodiment. FIG. 5 is a side sectional view showing still another embodiment, FIG. 6 a is a plan view of one component of this embodiment, FIG. 6 b is a side view thereof, and FIG. 6 c is an elevation view thereof. It is. In the drawing, 11 is an objective lens, 12 is an imaging lens group, 30 is a moving index, 34 is a storage means, and 39 is a recording paper.

Claims (1)

[Claims] 1. A first projection means for projecting a lipid marker onto a predetermined part of the fundus of the eye to be examined using a visible light flux, a second projection means for projecting the predetermined part onto a predetermined observation surface or a photographing surface, and a second projection means for projecting the predetermined region onto a predetermined observation surface or a photographing surface; a third projection means for projecting the target image to a position corresponding to the position of the index image on the fundus of the eye by the first projection means without passing through the fundus of the eye to be examined; a moving means for moving the index within a predetermined plane; An ophthalmological apparatus comprising: a display means for displaying the moving position of the index; and a fourth projection means for projecting the movement information displayed on the display means onto the observation plane or the projection plane.