JPH0638929A - Ophthalmic apparatus - Google Patents

Abstract

PURPOSE:To efficiently measure ophthalmic refractivity without using a sighting device, by a method wherein a measuring light source located within an apparatus main body is used also for sighting. CONSTITUTION:When ophthalmic refractivity is measured, an external target 28 is separated from an eye E to be examined, by a definite distance, and is presented to the eye E through a light-splitting member 22. The adjustment of the distance between the external target 28 and an apparatus main body 11, at this presentation, is done by turning on a light source 12 for measuring and by projecting the image of the emmetropic fundus onto an eyeground Er, by means of an adjusting switch 31. The external target 28 or the apparatus main body 11 is moved or turned in all directions, vetical and horizontal, in order that the image of the emmetropic fundus is matched to the fixation point of the external target 28, at the face of the eyeground Er, i.e., a visual axis A is matched to an optical axis for measurement. In this way, it is made unnecessary for an examining person to remove and mount a sighting device each time a target position for fixation is adjusted, and thus the examining person can be saved the trouble of moving the sighting device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus widely used in ophthalmology clinics and eyeglass stores.

[0002]

2. Description of the Related Art In front of an eye to be examined, there is provided a light splitting member for splitting the eye refracting power measuring light and the target light which can be fixed without going through an imaging optical system. For example, Japanese Patent Application Laid-Open No. 56-6 discloses a configuration in which the eye is fixed to the eye to be examined through the light splitting member and the eye refractive power is objectively obtained.
It is known from Japanese Patent No. 3330, Japanese Patent Laid-Open No. 55-81634, and the like.

FIG. 17 shows a conventional example of this type of apparatus. Normally, the apparatus main body 1 is placed on an optical stand or the like and placed in a medical examination room or the like, and is fixed in a natural state without an imaging optical system. The visual target 2 is arranged at a predetermined distance from the apparatus main body 1 so that the visual axis A toward the external visual target 2 and the measurement optical axis B coincide with each other. Therefore, a removable or rotatable sighting device 3 as shown in FIG. 18 is placed on a part of the device body 1 so that the fixation point of the optotype 2 is aligned with the sight axis of the sighting device 3. , The target 2 or the device body 1 is moved. Thereby, the visual axis A to the visual target 2
And the measurement optical axis B coincide with each other in the eye E.

The accommodative force is generally the reciprocal of the distance from the corneal apex of the farthest object point at which the eye can be focused (diopter) and the reciprocal of the distance of the closest object point from the corneal apex (diopter).
In the past, accommodative force was measured by moving the internal visual target placed inside the main body with an autorefractometer, but near-point measurement while fixing the optical image with one eye. However, it is unnatural for the eye to be inspected, and there is a problem in measurement value dispersion, measurement accuracy, etc. Therefore, an optical splitter is placed between the autorefractometer and the eye to be inspected, and there are two A fixation target is provided and both are selectively displayed for measurement.

Further, in the device for measuring the eye refractive power of the eye to be inspected, the device has a fixation target which can be optically presented from an arbitrary position, and is moved further away from the measured position of the eye refractive power. Of the type having a fog mechanism for relaxing adjustment of the eye to be inspected, or a second fixation target and device arranged in the real space, as disclosed in Japanese Patent Laid-Open No. 61-53056. It has a first fixation target arranged inside, and a wavelength division member having a high reflectance only at a specific wavelength in the visible wavelength range is arranged between them, and both are selectively presented to the eye to be examined. There is known a device that does.

[0006]

However, in the conventional example of FIG. 17, the sighting device 3 must be placed every time the position of the fixation target 2 is adjusted, and the sighting device 3 removed is lost or damaged. However, there is a drawback that the visual axes do not match due to mounting errors.

Further, when measuring the accommodative force, the measurement start position of the fixation target cannot be limited, which not only burdens the eye to be inspected, but also has a drawback that the measurement time becomes long.

Further, in the device disclosed in Japanese Patent Laid-Open No. 61-53056, the first fixation target disposed inside the device is a dichroic mirror having a high reflectance only at a certain wavelength. Therefore, it is impossible to use a fixation target composed of various colors such as a slide photograph of a landscape due to the problem of color reproducibility. Moreover, even when the real space is viewed through the dichroic mirror, unnatural color reproduction occurs because only light of a certain color cannot pass through the mirror.

A first object of the present invention is to solve the above-mentioned drawbacks and to provide an ophthalmologic apparatus capable of efficiently measuring accommodation force without using a sighting device.

A second object is to provide an ophthalmologic apparatus capable of efficiently measuring the adjustment force when the fixation target is moved from the far point to the near point to measure the adjustment force.

A third object of the present invention is to provide an ophthalmologic apparatus capable of adjusting the color balance of the visual target presented to the subject and making a measurement without giving the subject a feeling of discomfort.

[0012]

The ophthalmologic apparatus according to the first aspect of the present invention for achieving the above object projects a light beam onto the fundus of the eye,
In an ophthalmologic apparatus that receives the reflected light with a photoelectric element to measure the refractive power, a light splitting member that is arranged in front of the eye to be split and splits the measuring light flux and the light flux by the external target, and on the refractive power measurement optical path. A light source that is arranged and lights up when the external visual target is adjusted is provided.

In the ophthalmologic apparatus according to the second aspect of the present invention, the first optotype presenting means having the first fixation target, the position detecting means and driving means of the first fixation target, and the eye to be examined are A second optotype presenting means capable of fixation through the imaging optical system, and means for projecting a light flux onto the fundus of the eye to be examined and receiving the fundus reflected light by the photoelectric element to obtain the eye refractive power of the eye to be examined The ophthalmologic apparatus further comprises means for moving the first fixation target to a predetermined position based on the far point refractive power measurement value obtained from the second target presentation means.

The ophthalmologic apparatus according to the third aspect of the present invention has a wavelength having a high reflectance or transmittance in the infrared wavelength range and a predetermined reflectance or transmittance substantially independent of the wavelength in the visible wavelength range. A light splitting member having selectivity, a first fixation target arranged in an optical path divided by the light splitting member, and the first fixation target is projected optically from an arbitrary position onto an eye to be examined. In order to move a part of the member or the first fixation target itself, a first fixation target system, a projection optical system for projecting a light flux of an infrared wavelength on the fundus of the eye to be examined, and an eye to be examined. And a detection optical system including a photodetection element for detecting the reflected light reflected by the fundus of the eye.

[0015]

In the ophthalmologic apparatus according to the first aspect of the present invention having the above-mentioned structure, the luminous flux is projected onto the fundus of the eye, the reflected light is received by the photoelectric element, and the reflected light is placed in front of the eye to be inspected to measure the eye refractive power and the external visual target. By providing a light splitting member that splits the light and a light source that is placed on the optical path for measuring the refractive power and that can be turned on when adjusting the external visual target, the optical axis of the measurement system and the visual target of the eye to be inspected with the light source as the aim. The axis is made to substantially coincide with each other in the eye to be examined.

Further, the ophthalmologic apparatus according to the second invention moves the first fixation target to the far point equivalent position obtained from the second target presentation means and guides the viewpoint to the first fixation target. , The first fixation target is moved closer until the accommodation force of the eye to be inspected cannot follow, and the accommodation force of the eye to be inspected is calculated.

In the ophthalmologic apparatus according to the third aspect of the invention, the first fixation target is projected onto the eye to be inspected through the light splitting member having a predetermined reflectance or transmittance that does not depend on the wavelength.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 shows a first embodiment of the eye refractometer according to the present invention, in which a measuring light source 12 composed of a near infrared light emitting diode or the like containing a visible light component is arranged in an apparatus main body 11, and an eye E is examined. Towards the condenser lens 13, FIG.
A diaphragm 14 having an opening 14a as shown in (a) and arranged substantially conjugate with the emmetropic fundus, a projection lens 15, a projection diaphragm 16,
A perforated mirror 17, a relay lens 18, a mirror 19, a light splitting member 20, an objective lens 21, and a light splitting member 22 are arranged. The diaphragm 14 may have a symmetrical opening 14b as shown in FIG. 2 (b).

Further, the light splitting member 2 for the light flux from the eye E to be inspected
In the reflection direction of 0, the light splitting member 23 and the two-dimensional photodetector 2
4 are arranged. Further, between the perforated mirror 17 and the light splitting member 23, the perforated diaphragm 25 and the relay lens 2 are provided.
6 and the prism 27 are arranged. An external visual target 28 is provided on the visual axis A of the eye E behind the light splitting member 22. The output of the two-dimensional photodetector 24 is connected to the arithmetic control circuit 30 via the amplifier circuit 29, and the arithmetic control circuit 30 is connected to the measurement light source 12 and the adjustment switch 31.

The luminous flux emitted from the measuring light source 12 is a condenser lens 13, a diaphragm 14, a projection lens 15, a projection diaphragm 16, a perforated mirror 17, a relay lens 18, a mirror 19, a light splitting member 20, an objective lens 21, and a light. Split member 2
2 is projected onto the fundus Er of the eye E to be examined at a viewing angle of 1 to 2 degrees. The reflected light reflected by the fundus Er returns to the original optical path, is reflected by the light splitting member 22, and is reflected by the objective lens 21 and the light splitting member 20.
Through the relay lens 18 and reflected upward by the perforated mirror 17. Further, a fundus reflection image is formed on the two-dimensional photodetector 24 via the porous diaphragm 25, the relay lens 26, the prism 27, and the light splitting member 23. Then, based on this reflected image, the arithmetic control circuit 30 calculates the eye refractive power by a known method.

The external visual target 28 is separated from the subject's eye E by a predetermined distance and is presented to the subject's eye E via the light splitting member 22 when the eye refractive power is measured. External visual target 28 at the time of presentation
The position of the device main body 11 is adjusted by turning on the measurement light source 12 by using the adjustment switch 31 and displaying the image of the standard eye fundus.
The image is projected onto Er, and on the fundus Er of the eye E to be examined at this time, so that the stereoscopic eye fundus image and the fixation point of the external visual target 28 match, that is, the visual axis A and the measurement optical axis match. This is performed by moving the optotype 28 or the device main body 11 vertically or horizontally or by turning.

FIG. 3 shows a second embodiment of the apparatus main body 11
An internal target system for guiding the line of sight of the eye E is provided therein, and the eye refractive power measurement system is the same as that of the first embodiment. The internal optotype system presents the internal optotype 32 to the eye E to be inspected. In addition to the first embodiment, a light splitting member 33 is provided between the light splitting members 20 and 23 and is arranged in the incident direction. A relay lens 34, a mirror 35, a projection lens 36 movable along the optical axis, an internal visual target 32, and an illumination light source 37 are arranged. In addition, a light shield plate 39 is provided behind the light splitting member 12 via a hinge 38 so as to be openable and closable, and a switch 40 for detecting the opening and closing of the light shield plate 39 is provided in the apparatus main body 11. The output of the switch 40 is calculated. It is connected to the control circuit 30.

The image of the internal optotype 32 irradiated onto the illumination light source 37 from the back side is passed through the projection lens 36, the mirror 35, the relay lens 34, the light splitting members 33 and 20, the objective lens 21, and the light splitting member 22. It is projected on the fundus Er of the eye E to be examined. At the time of measurement by the internal optotype 32, the light shielding plate 39 rotatable by the hinge 38 is arranged at the position indicated by the solid line to block the optical path of the external optotype 28. On the other hand, at the time of measurement by the external visual target 28, the light shielding plate 39 is moved to the position of the dotted line so that the eye E to be examined can fixate the external visual target 28. Further, the opening / closing of the light shielding plate 39 is detected by the switch 40, and when the light shielding plate 39 is open, the light source 37 is turned off.

When adjusting the positions of the external optotype 28 and the apparatus main body 11, the light shielding plate 39 is opened, the light source 37 is turned on by the adjustment switch 31, and the image of the internal optotype 32 is projected onto the fundus Er, and the fundus Er is examined. Upward / downward / leftward / rightward or rotational movement of the external visual target 28 or the apparatus main body 11 so that the image of the internal visual target 32 and the fixation point of the external visual target 28 match, that is, the visual target A and the measurement optical axis match. By. At this time, the internal optotype 32 is shown in FIG.
As shown in, it is desirable to arrange the pattern of the fixation target near the center at an angle of 1 to 2 degrees with respect to the viewing angle.

The third embodiment shown in FIG. 5 is a modification of the internal optotype of the second embodiment. As shown in FIG. 6, the internal optotypes are the measurement internal optotype 32a and the aiming internal. Optotype 32b
Are prepared, attached to the turntable 41, rotatable by the motor 42, and selected for use. The position of the external visual target 28 is adjusted by the aiming internal visual target 32b as in the second embodiment.

FIG. 7 shows a fourth embodiment, in which the mirror 35,
A half mirror 43 is arranged between the projection lenses 36, and the light flux of the aiming light source 45, which is emitted by a command of the arithmetic control circuit 30 via the projection lens 44, is projected onto the fundus Er of the eye E to be examined. . In this embodiment, the light source 45 is arranged by using the half mirror 23 in the internal optotype, but the same effect can be obtained by arranging the light source 45 on the measurement optical axis.

FIG. 8 is a plan view of the fifth embodiment, and FIG.
Is a side view. The fixation target 53 located on the visual axis B of the eye E is fixed on the support plate 52 that is movably supported along the two guide rails 51a and 51b via the guide portions 52a and 52b. There is. A belt 5 driven by a motor 55 via a pulley 54a is attached to the guide portion 52a.
6 is fixed to drive the support plate 52 in the visual axis B direction. A spring 58 is attached to the bearing 57 of the other pulley 54b to support the belt 56 by applying an appropriate tension. Also, the guide rail 51b
A slit plate 59 is provided along the
The position detection circuit 61 can detect the position of the fixation target 53 by the photo encoder 60 and the slit plate 59 arranged on the 2b.

An optical system for measuring the refractive power of the eye is arranged below the visual axis B, and from the measuring light source 62 toward the eye E to be examined,
Lens 63, diaphragm 64, perforated mirror 65, mirror 6
6, an objective lens 67, and a light splitting member 68 are sequentially arranged. A 6-hole diaphragm 69 having 6 holes, a lens 70, a separating prism 71 composed of 6 wedge prisms, and a light splitting member 72 are arranged in the reflecting direction of the apertured mirror 65. A light receiving element 73 is provided in the direction.

A light splitting member 74 is provided on the eye E side of the perforated mirror 65, and a diopter lens 75, a fixation target 76, movable by a motor (not shown), is provided on the incident side thereof.
A light source 77 is arranged to guide the line of sight to the fixation target system. Further, a light splitting member 78 is provided on the side of the eye E to be examined of the light splitting member 74, and a mirror 79, a lens 80, and a light splitting member 72 are provided in the reflecting direction of the light splitting member 78. The image of the anterior segment is captured by 73.

The light receiving element 73 is the image pickup element driving circuit 8
1, the motor 55 is connected to the motor drive circuit 82, and the arithmetic control circuit 83 is connected with the position detection circuit 61.
Controlled by. The obtained information is displayed on the display memory 84,
The image is displayed on the television monitor 86 via the image synthesizing means 85.

At the time of measurement, the light source 77 emits light to guide the line of sight to the fixation target 76. Therefore, the measurement light source 62 is caused to emit light continuously or intermittently to guide the light along the visual axis B and to the fundus Er.
When illuminating, the fundus reflected light returns to the same optical path and is reflected by the perforated mirror 65, and the 6-hole diaphragm 69 and the lens 7
An image is formed on the light receiving element 73 through 0, the separation prism 71, and the light splitting member 72. The image obtained by the light receiving element 73 is analyzed by the arithmetic control circuit 83, and the eye refractive power of the eye E to be examined is calculated.

Then, the diopter lens 75 is moved to guide the line of sight of the eye E to be distant. When the accommodation power does not follow and the eye refraction power does not change, the fixation target 53 is moved from the position of the diopter lens 75 to a distance corresponding to the fundus refraction value by using the motor 55.
To move. For example, when the refractive power of the eye E is -4 diopters (VD = 0), the fixation target 53 is moved to a position 25 cm from the eye E.

Then, the light source 77 is turned off and the line of sight is fixed to the fixation target 5.
After guiding to 3, the fixation target 53 is gradually moved in the near direction.
The eye refractive power is continuously or intermittently measured while driving the fixation target 53 to the near side, and when the accommodation power does not follow and the eye refractive value does not change, the eye refractive power at that time is stored. By this, the accommodation power of the eye E to be examined, which is the difference between the refractive power at the farthest point and the refractive power at the closest point, is calculated and stored in the display memory 84. The measurement result is displayed on the television monitor 86 via the image synthesizing means 85, and is output from a printer (not shown) as needed.

Here, if the far point refractive power value of the eye E is out of the movement range of the fixation target 53, the fixation target 53 is moved to a predetermined position, for example, the left end, and at that position. The value of a lens having a refractive power such that the eye E to be inspected becomes a far point is displayed on the television monitor 86 via the scale 84 and the image synthesizing means 85.
To display. Therefore, the examiner attaches the lens having the displayed refractive power to the eye E to be examined and measures the near-point side refractive power as described above.

In the fifth embodiment, the far-point side refractive power is calculated using the fixation target 76, but a fixation target without the optical system behind the separating prism 71 is presented. May be Although the television monitor 86 is used to display the lens value, other display means such as liquid crystal display and LED display may be used without any problem.

FIG. 10 is a block diagram of a sixth embodiment represented by an eye refractometer. A dichroic mirror 92 for introducing the line of sight of the subject is provided on an upper portion of a casing 91 containing the optical system. This dichroic mirror 9
In the second reflection direction, the objective lens 93, the prism 94, the lens 95, the first fixation target 96 that is movable in the optical path direction and is formed of a transmissive body such as a landscape slide, and the first fixation target 96 from the rear side. A white light source 97 such as an incandescent lamp for illuminating is sequentially arranged, and the first fixation target 9 is placed at an optical arbitrary distance.
6 is arranged. A second fixation target 98 arranged in the real space is provided behind the dichroic mirror 92, and a rotatable movable portion 99 provided on the side surface of the casing 91 is like 99 '. The first fixation target 96 and the second fixation target 98 can be selectively presented to the subject by pivoting to and opening the line-of-sight direction.

Behind the prism 94, an optical system for measuring the eye refraction value is prepared. That is, in front of the measurement light source 100 having an intensity peak in the infrared wavelength region, a lens 101, a diaphragm 102, a perforated mirror 103 having an opening in the center, a lens 104, and a prism 94 are sequentially arranged. A six-hole diaphragm 105, a lens 106, a separation prism 107, and an image sensor 108 are arranged in the reflection direction of the perforated mirror 103.

At the time of measurement, it is determined whether the first fixation target 96 or the second fixation target 98 is used, and when the first fixation target 96 is used, a white light source is used. 97 is turned on and the movable part 99 is closed. The first fixation target 9 on the eye E to be examined
When 6 is focused on and the measurement light source 100 is turned on, the infrared light flux is reflected by the lens 101, the diaphragm 102, the perforated mirror 103,
It is projected onto the fundus Er of the eye E through the lens 104, the prism 94, the objective lens 93, and the dichroic mirror 92. The reflected light reflected by the fundus Er returns to the original optical path, is reflected by the perforated mirror 103, and has a 6-hole diaphragm 105 and a lens 1.
06, through the separation prism 107, it is separated into six light beams and projected on the image sensor 108. The eye refraction power of these 6
It can be calculated from the positional relationship of the individual light fluxes.

The film structure on one surface of the dichroic mirror 92 on the side of the eye E to be inspected is, for example, an infrared wavelength obtained by evaporating a high refractive index and a low refractive index dielectric alternating layer on a metal semi-transparent mirror such as Ag or Al. By using a structure in which the reflectance in the region is increased or a similar infrared wavelength reflection increasing alternating layer is added to the semi-transparent mirror by the dielectric alternating layers, the visible light as shown in FIG. We have realized a multilayer film that has a uniform transmittance in the region and does not transmit any light in the infrared region. Since this multilayer film has a uniform transmittance in the visible light range, the light flux transmitted or reflected by the dichroic mirror 92 does not lose its color balance and gives the subject an unnatural color sensation. Never.

Further, as shown in Japanese Patent Laid-Open No. 64-53056, a movable portion 99 provided in the casing 91.
It is easy to automatically turn on the white light source 97 of the first fixation target 96 by detecting that the optical path to the second fixation target 98 is blocked. In addition to the method of automatically detecting the switching of the fixation target as described above, the examiner intentionally controls the lighting of the white light source 97 of the first fixation target 96 to, for example, When the person is facing the white wall, the movable part is opened 99 'and the first fixation target light source 6 is turned on to fix the image optically projected in the so-called binocular open state. Can be made. In this case, the eye refractive power can be measured in a more natural state without giving unnecessary psychological pressure to the subject.

FIG. 12 is an explanatory view of another example of the dichroic mirror 92. In the above-described embodiment, the multilayer thin film is deposited only on the front surface of the dichroic mirror 92,
A dichroic mirror having desired characteristics has been manufactured, but in this case, the dichroic mirror 1
As shown in FIG. 13, on the surface 110 a of the visible region 10,
A multilayer film having almost 50% uniform transmission characteristics in the infrared region is vapor-deposited, and the back surface 110b has almost 100% transmission characteristics in the visible region as shown in FIG. 14, and almost transmits light flux in the infrared region. A multilayer film having the property of not depositing is deposited. Even if the dichroic mirror 110 having such a structure is used, the same structure as that of the sixth embodiment can be obtained. However, in such a case, as shown in FIG. 12, a translational deviation of the optical axis occurs between the visible light reflected on the front surface 110a and the infrared light reflected on the back surface 110b. It is necessary to add the amount.

FIG. 15 is a block diagram of the seventh embodiment. Instead of the dichroic mirror 92 used in the sixth embodiment, a dichroic mirror having a transmission characteristic opposite to that of the dichroic mirror 92 as shown in FIG. 111 is used. For simplification, the same members as those in the sixth embodiment are designated by the same reference numerals and the description thereof will be omitted. A dichroic mirror 111 is arranged in front of the eye E to be inspected, and reaches the casing 91. A mirror 112 and a second fixation target 113 are sequentially arranged in the reflection direction of the dichroic mirror 111 to form a target system in real space. As shown in FIG. 16, the dichroic mirror 111 has a substantially uniform transmission characteristic in the visible light region, and exhibits a very high transmission characteristic in the infrared region.

Although not shown in FIG. 15, a means for blocking and opening the line of sight is provided like the movable part 99 of the sixth embodiment to select both optical paths, or both optical paths are opened simultaneously. Since it can be easily done, the above effect does not change at all.

[0044]

As described above, in the ophthalmologic apparatus according to the first aspect of the present invention, since the measuring light source arranged in the main body is also used for aiming, it is not necessary to attach and detach for each adjustment, and the labor of the examiner is reduced. Can be omitted. Further, there is no possibility of loss or damage, the number of parts can be reduced, and the measurement optical axis and the visual axis coincide with each other, so that highly accurate measurement can be performed. Further, since the adjustment force is smoothly measured, the subject does not feel uncomfortable and the measurement time is shortened.

In the ophthalmologic apparatus according to the second aspect of the present invention, by moving the fixation target for measuring the near point in the natural vision state to the far point position measured in advance, continuous measurement from the far point to the near point can be performed. In addition to being possible, it is possible to perform an efficient inspection because it is not necessary to make an extra measurement at a place far from the far point.

The ophthalmologic apparatus according to the third aspect of the present invention uses a dichroic mirror having a uniform transmittance characteristic in the visible light range irrespective of the wavelength on the optical path for guiding the line of sight to the visual target so that the color of the fixed visual target is changed. The balance is not disturbed, the color reproduction is good even when the fixation target in the real space and the fixation target viewed through the dichroic mirror are viewed at the same time, and there is no psychological discomfort. The adverse effect on ophthalmic measurement can be suppressed to a low level.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is a front view of a diaphragm for measurement.

FIG. 3 is a configuration diagram of a second embodiment.

FIG. 4 is a front view of an internal index.

FIG. 5 is a configuration diagram of a third embodiment.

FIG. 6 is a front view of an internal index.

FIG. 7 is a configuration diagram of a fourth embodiment.

FIG. 8 is a plan view of the fifth embodiment.

FIG. 9 is a side view.

FIG. 10 is a configuration diagram of a sixth embodiment.

FIG. 11 is a spectral transmittance curve of a dichroic mirror.

FIG. 12 is a cross-sectional view of another dichroic mirror.

FIG. 13 is a spectral transmittance curve of the surface of another dichroic mirror.

FIG. 14 is a spectral transmittance curve of the back surface of another dichroic mirror.

FIG. 15 is a configuration diagram of a seventh embodiment.

FIG. 16 is a spectral transmittance curve of a dichroic mirror.

FIG. 17 is a configuration diagram of a conventional eye refractometer.

FIG. 18 is a perspective view of a sighting device.

[Explanation of symbols]

 12, 62 Measurement light source 16, 65 Perforated mirror 20, 22, 68, 74, 78 Light splitting member 24 Two-dimensional photodetector 28 External visual target 31 Adjustment switch 32 Internal visual target 32a Internal visual target 32b Aiming target Internal target 39 light-blocking plate 41 turntable 45 aiming light source 53, 96, 98, 113 fixation target 59 slit plate 60 photo encoder 73 light receiving element 91 housing 108 image sensor

Claims (10)

[Claims] 1. In an ophthalmologic apparatus for projecting a light flux onto a fundus and receiving the reflected light by a photoelectric element to measure the refractive power, it is arranged in front of an eye to be inspected and a measurement light flux and a light flux from an external visual target are divided. An ophthalmologic apparatus comprising: a light splitting member for controlling the optical power, and a light source which is disposed on the optical path for measuring the refractive power and is turned on when the external visual target is adjusted. 2. The light source is a light source for measuring eye refractive power,
The ophthalmologic apparatus according to claim 1, wherein a light flux including a visible component is emitted. 3. The ophthalmologic apparatus according to claim 1, wherein the light source is a fixation target for guiding diopter of an eye to be inspected, which is provided in a housing. 4. The ophthalmologic apparatus according to claim 1, wherein the light source is a visible light source exclusively for fixation used in a housing. 5. A first optotype presenting unit having a first fixation target, a position detecting unit and a driving unit of the first fixation target, and an eye to be inspected through an imaging optical system. An ophthalmologic apparatus comprising: a second optotype presenting means capable of presenting the light flux; and a means for projecting a light flux onto the fundus of the eye to be inspected and receiving the fundus reflected light by a photoelectric element to obtain the eye refractive power of the eye to be inspected. An ophthalmologic apparatus comprising means for moving the first fixation target to a predetermined position based on the far point refractive power measurement value obtained from the target presenting means. 6. The far point refractive power measurement value of the eye to be examined is the first
If the fixation target is outside the range of movement of the fixation target, the first fixation target is moved to a predetermined position, and the refractive power value of the lens attached to the eye is displayed so that the eye becomes the far point position at that position. The ophthalmologic apparatus according to claim 5, wherein. 7. The ophthalmologic apparatus according to claim 5, wherein the first fixation target can be rotated or inserted and removed. 8. A light splitting member having wavelength selectivity, which has a high reflectance or transmittance in the infrared wavelength range and has a predetermined reflectance or transmittance substantially independent of wavelength in the visible wavelength range. A first fixation target arranged in an optical path divided by the light dividing member, and a part of the member or the first fixation target for projecting the first fixation target from an arbitrary optical position to an eye to be examined. A first fixation target system capable of moving the first fixation target itself;
An ophthalmologic apparatus comprising: a projection optical system that projects a light flux having an infrared wavelength onto the fundus of the eye to be inspected; and a detection optical system that includes a photodetection element that detects reflected light reflected by the fundus of the eye to be inspected. . 9. The ophthalmologic apparatus according to claim 8, further comprising a second fixation target system which transmits the light splitting member and fixes a second fixation target arranged in a real space. 10. The light splitting member is made of plate-shaped glass, one surface of which has a characteristic of transmitting visible wavelength light and reflecting of infrared wavelength light, and the other surface of which has a visible wavelength region of light. The ophthalmologic apparatus according to claim 8, which is a light splitting member having a characteristic of substantially uniformly reflecting at a predetermined ratio.