JPH05285105A - Ophthalmic device - Google Patents

Abstract

PURPOSE:To provide the ophthalmic device on which a burden by an observation light source is not imposed at the time of alignment work and at the time of focusing work. CONSTITUTION:In the ophthalmic device which is provided with an illuminating optical system 1 for guiding an illuminating light from an observation light source 3 to an eye E to be examined, and an observation/photographing optical system 2 for guiding a reflected from the eye E to be examined, and also, has a small hole 41a or light transmission windows 35a, 35b being an alignment target or a focusing target projected to the eye E to be examined by an illuminent light from target light sources 31, 40, this device has a control circuit 22 for turning off the observation light source 3 at the time of alignment or at the time of focusing adjustment executed by the small hole 41a or the light transmission windows 35a, 35b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus having an observation light source and an alignment target or a focusing target.

[0002]

2. Description of the Related Art Conventionally, examples of this type of ophthalmologic apparatus include a keratometer, a slit lamp, and a fundus camera.

This ophthalmologic apparatus includes an illumination optical system for guiding the illumination light from the observation light source to the eye to be inspected, and an observation / photographing optical system for guiding the light reflected from the eye to be inspected.
It has an alignment target or an in-focus target projected onto the eye to be inspected by the illumination light from the target light source.

In such an ophthalmologic apparatus, an alignment target or an in-focus target is projected onto the eye to be inspected by the illumination light from the light source for the target to observe the target image by the reflected light from the eye to be inspected. , Alignment work and focusing work. At this time, the illumination light from the observation light source is guided to the eye to be inspected through the illumination optical system to illuminate the eye to be inspected, and the eye image to be inspected by the reflected light from the eye to be inspected is also observed together with the target image. ..

[0005]

By the way, during alignment work or focusing work, it takes time to complete the work, and the work time varies depending on the individual difference of the examiner. Moreover, when the alignment is out of alignment or the focus is not achieved, the image of the eye to be inspected is not clearly visible, and therefore the eye to be inspected need not necessarily be observed.

However, even during the alignment work and the focusing work, the eye to be inspected is illuminated by the observation light source as described above, so that the eye to be inspected is burdened.

Therefore, an object of the present invention is to provide an ophthalmologic apparatus in which the observation light source does not burden the alignment work or the focusing work.

[0008]

To achieve this object, the invention according to claim 1 provides an illumination optical system for guiding illumination light from an observation light source to an eye to be inspected, and a reflected light from the eye to be inspected. It is equipped with an observation / shooting optical system to guide you,
In an ophthalmologic apparatus having an alignment target or a focusing target projected onto the eye to be inspected by illumination light from a target light source, the observation light source is in a light amount reducing direction at the time of alignment adjustment or focusing adjustment by the target. It is characterized in that it is an ophthalmologic apparatus having control means for controlling.

Further, the invention of claim 2 is characterized in that the control means turns on and off the observation light source according to the adjustment state.

Further, the invention of claim 3 is characterized in that the control means adjusts the light amount of the observation light source according to the adjustment state.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a fundus camera as an ophthalmologic apparatus according to the present invention comprises an illumination optical system 1, an observation / photographing optical system 2, a focusing target projection optical system G, and an alignment target projection optical system. With system A. The illumination optical system 1 has an observation illumination optical system and a photographing illumination optical system.

The observation illumination optical system includes an observation light source 3, a condenser lens 4, a ring slit 5, a relay lens 6, a ring slit 5 ', a relay lens 6', a reflection mirror 7,
The relay lens 8, the perforated mirror 9, and the objective lens 10 have optical components in this order. Then, the illumination light from the observation light source 3 includes a condenser lens 4, a ring slit 5, a relay lens 6, a ring slit 5 ', and a relay lens 6.
´, reflective mirror 7, relay lens 8, perforated mirror 9,
The light is projected on the fundus Ef of the eye E through the objective lens 10 and the like. Reference numeral 9a is a central hole of the perforated mirror 9.

The photographing illumination optical system includes a photographing light source 11 such as a xenon lamp, a condenser lens 12, a half mirror 13 disposed between the condenser lens 4 and the ring slit 5, and an objective from the ring slit 5 of the observation illumination optical system. It has optical components up to the lens 10. The illumination light from the photographing light source 11 is a condenser lens 12, a half mirror 13 arranged between the condenser lens 4 and the ring slit 5, and a ring slit 5 of the observation illumination optical system.
To the fundus Ef through the optical components from the lens to the objective lens 10.
Is projected on.

The half mirror 13 and the ring slit 5
An exciter filter 14 (optical component) for visible fluorescence imaging and an exciter filter 15 (optical component) for infrared fluorescence are provided between and between and so that they can be selectively inserted and removed. The exciter filters 14 and 15 are designed to be inserted into and removed from the optical path of the illumination optical system 1 by the motor M1 which is the first driving means.

The observation / photographing optical system 2 includes an objective lens 10,
It has a perforated mirror 9, a focusing lens 16, an imaging lens 17, and an optical path correction plate 18. The optical path compensator 18 has a motor M3
It is designed to be inserted into and removed from the optical path of the observation / photographing optical system.

The reflected light or fluorescence from the fundus oculi Ef is the objective lens 10, the central hole 9a of the perforated mirror 9, the focusing lens 16, the imaging lens 17, the optical path correction plate 18 (only when in the optical path). It is guided to the area CCD 19 (image pickup device, image pickup means) via the above. This area CCD 19
The one used has a sensitivity from visible light to infrared light.

A barrier filter 20 (optical component) for visible fluorescence photography and a barrier filter 21 (optical component) for infrared fluorescence are selectively inserted / removed between the perforated mirror 9 and the focusing lens 16. It is possible.

The focusing lens 16 is provided so as to be driven and operated in the optical axis direction by the motor M, and the barrier filter 2 is provided.
Reference numerals 0 and 21 are designed to be inserted into and removed from the optical path of the observation / photographing optical system 2 by the motor M2 which is the second drive means.

A reflective optical member 30 is arranged between the ring slits 5 and 5'of the illumination optical system. As shown in FIG. 2, the reflective optical member 30 is provided with a pair of total reflection surfaces 30b and 30c on a transparent plate 30a at intervals.

The total reflection surfaces 30b, 30c are arranged vertically in FIG. 1, and the line connecting the centers of the total reflection surfaces 30b, 30c is orthogonal to the optical axis O of the observation optical system at a point P. There is. Moreover, this point P is provided so as to be conjugate with the iris of the eye E to be inspected.

The target projection optical system G for focusing includes a focusing light source 3
1, condenser lens 32, split prism 33,
34, index plate 35, relay lens 36, reflection mirror 37
Have. Then, as shown in FIG. 3, the index plate 35 corresponds to the split prisms 33, 34 and has a light-transmitting window 35a,
35b is used as an index. The transparent windows 35a and 35b
Is provided so as to be conjugate with the fundus Ef of the eye E through the relay lens 36, the reflection mirror 37, the reflection optical member 30, and the optical member from the ring slit 5 ′ to the objective lens 10. The split prisms 33 and 34 are adapted to move in the optical axis direction in conjunction with the focusing lens 16.

The target projection optical system A for alignment has an alignment light source 40, a mask 41, a lens 42, and a quick return mirror 43 arranged between the perforated mirror 9 and the focusing lens 16. The mask 41 has two small holes 41a (only one is shown) as a target.

The small hole 41a is provided at a position slightly displaced from the optical axis, and is arranged so as to be conjugate with the position of 1/2 of the curvature of the cornea of the eye to be inspected (anterior eye part of the eye to be inspected). ..
Moreover, the two small holes 41a are formed by the alignment light source 4
The light flux from 0 is projected onto the cornea of the eye to be inspected from the left and right of the optical axis toward a portion at a position of 1/2 of the curvature of the cornea of the eye to be inspected (anterior eye part of the eye to be inspected).

Further, the above-mentioned motors M, M1, M2, M
3 is driven and controlled by a control circuit 22 having a CPU, and the observation light source 3, the photographing light source 11, the focusing light source 31, and the alignment light source 40 are also controlled to emit light by the control circuit 22.

Next, the control of the control circuit 22 will be described.

In such a structure, even if a power switch (not shown) is turned on, the control circuit 22 normally controls the motor M.
1, M2 drive control, exciter filter 14,
15 and the barrier filters 20 and 21 are removed from each optical path, and the motor M3 is drive-controlled to bring the optical path correction plate 18 out of the optical path.

Moreover, the control circuit 22 turns on the power switch.
When turned on, the observation light source 3 is controlled to be turned off (OFF) and the alignment light source 40 is turned on.

[Alignment Processing] In this state, the examiner moves the entire fundus camera vertically, forward and backward, and left and right with respect to the eye to perform the alignment work of the fundus camera. When this alignment is performed to some extent, the small beam 41a (target) is projected onto the cornea of the eye to be examined by the light flux of the alignment light source 40, and this light flux is reflected from the cornea of the eye to be examined.

Small hole 4 due to light reflected from the cornea of the eye to be examined
The image (index image) of 1a is formed on the area CCD 19 via the observation / photographing optical system 2, and the image signal from the area CCD 19 is input to the control circuit 22.

In this input state, the control circuit 22 controls the eye E to be examined.
It is determined whether or not the alignment is correct with respect to the area CC, that is, the image of the small hole 41a (index image) by the reflected light is the area CC.
An image is formed at a predetermined position in the center of D19, and it is continuously determined whether or not the signal from the pixel at this position is at or above a set level.

When the signal from the pixel at a predetermined position in the center of the area CCD 19 becomes higher than a set level by moving the entire fundus camera in this judgment state, the control circuit 22 turns off the alignment light source 40 and focuses the light. The light source 31 is turned on.

[Focusing Processing] As a result, the light flux from the focusing light source 31 is condensed by the condenser lens 32, the split prisms 33, 34, the index plate 35, the relay lens 36, the reflection mirror 37, the reflection optical member 30, and the ring slit 5 '. Is irradiated to the fundus oculi Ef through optical members from the lens to the objective lens 10, and the rectangular translucent windows 35a, 3a of the index plate 35 are radiated to the fundus oculi Ef.
5b is projected. Then, the light beam from the images (index image) of the light-transmitting windows 35a and 35b projected on the fundus Ef is reflected, and the index image by this reflected light beam is formed on the area CCD 19 through the observation / photographing optical system 2. The image signal from the area CCD 19 is input to the control circuit 22.

In this input state, the control circuit 22 controls the eye E to be examined.
On the other hand, it is determined whether or not it is in focus, that is, the images (index images) of the translucent windows 35a and 35b by reflected light are the area CCD.
It is continuously determined whether or not the image is formed at a predetermined position in the center of 19 without being displaced.

In this judgment state, the motor M2 is driven and controlled through the control circuit 22 by operating a switch (not shown), and the focusing lens 16 is moved in the optical axis direction, the split prisms 33, 34 are moved in the optical axis direction. The images (index images) of the transparent windows 35a and 35b formed on the fundus oculi Ef are relatively moved in a direction orthogonal to the direction in which the transparent windows 35a and 35b are arranged. By this operation, the images (index images) of the transparent windows 35a and 35b are aligned in the juxtaposed direction,
When the signal from a pixel at a predetermined position in the center of the area CCD 19 becomes higher than a set level, the control circuit 22 causes the focusing light source 31
Is turned off and the observation light source 3 is turned on.

[Observation / Photographing Processing] As a result, the illumination light from the observation light source 3 is condensed by the condenser lens 4, the ring slit 5, the relay lens 6, the reflection mirror 7, the relay lens 8, the perforated mirror 9, and the objective lens 10. The light is projected onto the fundus oculi Ef of the eye E to be inspected via the above.

At this time, the reflected light from the fundus Ef is the objective lens 10, the central hole 9a of the perforated mirror 9, and the focusing lens 1.
6. A fundus image is formed on the area CCD 19 by being guided to the area CCD 19 (imaging means) via the imaging lens 17.

The image information signal from the area CCD 19 is input to the control circuit 22, and the control circuit 22 causes the monitor TV 25 to display the image of the fundus oculi Ef via the image processing circuit 23. This display is done in real time.

When the photographing switch 24 is turned on in this state, this ON signal is input to the control circuit 22. Upon receiving this ON signal, the control circuit 22 stores the image information signal for one frame from the area CCD 19 in the frame memory FM.

After that, the control circuit 22 transfers the eye information stored and stored in the frame memory FM to the image processing circuit 23 and displays it on the monitor TV 25.

Further, when the examiner turns on the photographing switch 24 in a state where the examiner selects the infrared fluorescence photographing mode, the control circuit 22 drives and controls the motor M1 to illuminate the exciter filter 15 for infrared fluorescence. Insert in the optical path of system 1.
At the same time, the control circuit 22 drives and controls the motor M2 to insert the barrier filter 21 for infrared fluorescence into the optical path of the observation / photographing optical system 2, while driving and controlling the motor M3 to drive the optical path correction plate 18. It is inserted into the optical path of the observation / photographing optical system 2 to control the photographing light source 11 to emit light. In this state, a blood vessel contrast agent such as ICG (indocyanine green) that absorbs infrared excitation light and emits infrared fluorescence is intravenously injected (intravenously) to the subject.

Illumination light from the photographing light source 11 is emitted from the condenser lens 12, the half mirror 13 disposed between the condenser lens 4 and the ring slit 5, the exciter filter 15, and the ring slit 5 of the observation illumination optical system. Fundus E through optical components up to objective lens 10
It is projected on f. At this time, infrared excitation light is projected on the fundus Ef by the action of the exciter filter 15.

This infrared excitation light is absorbed by the ICG in the blood vessel of the fundus of the eye and causes the ICG to emit infrared fluorescence. This infrared fluorescence is generated by the objective lens 10, the central hole 9a of the perforated mirror 9,
Barrier filter 21, focusing lens 16, imaging lens 1
7. The fundus blood vessel image is formed on the area CCD 19 by being guided to the area CCD 19 (imaging means) via the optical path correction plate 18 and the like.

At this time, the optical path length correcting plate 18 corrects the optical path length due to the difference in wavelength between visible light and infrared light and forms an image of the eye to be inspected on the area CCD 19. On the other hand, the control circuit 22
Is accompanied by the light emission of the photographing light source 11 as described above.
The image information signal for one frame from D19 is stored in the frame memory FM.

After that, the control circuit 22 transfers the eye information stored and stored in the frame memory FM to the image processing circuit 23 and displays it on the monitor TV 25.

In the above-described embodiment, the imaging of the fundus blood vessel image by infrared fluorescence has been described, but the imaging of the fundus blood vessel image by visible fluorescence can be similarly controlled by the control circuit 22.

In this case, the control circuit 22 controls the motor M
1, M2 are driven and controlled, the exciter filter 14 for visible fluorescence and the barrier filter 20 are inserted into the optical path, and the optical path length correction plate 18 is removed from the optical path.

It should be noted that either the exciter filter or the barrier filter can be photographed as a monochrome image even if it is in the optical path at the time of photographing by the fundus reflected light.

[Other Examples of Alignment Optical System] In the embodiment described above, the alignment light source 40, the mask 41, the lens 42, the quick return mirror 43 disposed between the perforated mirror 9 and the focusing lens 16 are used. The example in which the target projection optical system A for alignment including the above is provided is shown, but the invention is not necessarily limited to this.

For example, as shown in FIG. 4, the tip portions 50a and 50a of the optical fibers 50 and 50 are arranged on the left and right of the central hole 9a of the perforated mirror 9 and the tip portion 50 is formed.
a, 50a, where the optical axis is half the curvature P of the cornea of the eye
It may be configured to face.

[Modification] In the embodiment described above, an example in which visible light is used for the target projection optical systems A and G is shown, but the invention is not necessarily limited to this.

For example, an infrared filter may be arranged in the middle of the target projection optical systems A and G so that the target for alignment and focusing is projected onto the eye E by infrared light. When projecting the target, the optical path length correction plate 18 may be arranged by the control circuit 22 in the optical path of the observation / photographing optical system 2.

Further, in the embodiment described above, the example in which the observation light source 3 is turned off during the alignment adjustment or the focus adjustment is shown, but the present invention is not limited to this.
For example, the observation light source 3 may be used during alignment adjustment or focus adjustment.
It is also possible to reduce the luminance of No. 2 to be lower than the normal luminance and illuminate the eye to be inspected with a lower luminance than the normal observation luminance.

It should be noted that the observation light source 3 at the stage of alignment OK
The amount of light may be returned to the normal observation brightness state. Here, the normal state is an arbitrary brightness set by the examiner.

[0055]

[Effect] Since the present invention is configured as described above,
It is possible to prevent the observation light source from being burdened during the alignment work or the focusing work.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an ophthalmologic apparatus according to the present invention.

FIG. 2 is an explanatory view of the reflective optical member shown in FIG.

FIG. 3 is an exploded perspective view showing the relationship between the split prism and the index plate shown in FIG.

FIG. 4 is an explanatory diagram showing another example of the alignment optical system shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Illumination optical system 2 ... Observation / photographing optical system 3 ... Observation illumination light source 22 ... Control circuit 41a ... Small holes (target) 35a, 35b ... Translucent window (target) G, A ... Target projection optical system

Claims (3)

[Claims] 1. An illumination optical system for guiding illumination light from an observation light source to an eye to be inspected, and an observation / photographing optical system for guiding light reflected from the eye to be inspected, and a light source for a target. In an ophthalmologic apparatus having an alignment target or an in-focus target projected onto the eye to be inspected by illumination light, it has a control means for controlling the observation light source in a light amount decreasing direction at the time of alignment adjustment or focus adjustment by the target. An ophthalmologic apparatus characterized by the above. 2. The ophthalmologic apparatus, wherein the control means turns on / off the observation light source according to the adjustment state. 3. The ophthalmologic apparatus, wherein the control means adjusts the light amount of the observation light source according to the adjustment state.