JP2676580B2 - Ocular microscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microscope for observing, photographing, or television-imaging an eyeball, particularly its corneal endothelial cells.

[0002]

2. Description of the Related Art The image of endothelial cells of the cornea is extremely dark and has a weak contrast. Therefore, when observed or photographed under normal illumination, it is disturbed by the corneal surface reflected light which is 20 times stronger than that. , I can't catch this. Therefore, as shown in FIG. 3, if the cornea 33 is obliquely illuminated by the slit-shaped illumination light 32 that has passed through the narrow slit 31, the image light ray 35 of the corneal endothelium 34 and the reflected light 37 of the surface 36 are separated. be able to.

FIG. 2 shows an example of an apparatus for photographing a corneal endothelial cell image according to the above principle. A condenser lens 5, a slit 6, a semitransparent mirror 7, a reflecting mirror 8, a focusing lens 9, a reflecting mirror 10 and a common objective lens from a strobe light source 4 along an illumination optical axis 3 oblique to the center axis 2 of the eyeball 1. Illumination light is emitted through 11, while the light source 12, the condenser lens 13,
The infrared illumination light along the branch illumination optical axis 16 is guided to the illumination optical axis 3 by the semitransparent mirror 7 through the infrared filter 14 and the slit 15.

The image light beam passes along the optical axis 17 of the image light beam, passes through the common objective lens 11, and is once formed by the image forming lens 18 into the image forming surface 1.
The image is formed on the image surface 9 and is formed again on the photosensitive surface 21 by the taking lens 20. The slits 6 and 15 described above correspond to the slit 31 in FIG.

In the apparatus shown in FIG. 2, first, the light source 12 is turned on and the infrared light transmitted through the filter 14 illuminates the eyeball 1,
Adjust the distance between the eyeball and the device to focus. At this time, infrared light is used for illumination so that the patient does not feel glare. When the subject is in focus, the strobe light source 4 is caused to emit light, and the slit-shaped visible light illuminates the eyeball 1 to expose the image of the corneal endothelial cells on the photosensitive surface 21.

[0006]

In FIG. 3, the width W of the visual field observable on the corneal endothelium 34 depends on the angle θ formed by the illumination light 32 and the image light ray 35. Therefore, in order to widen the visual field width W, the angle θ must be increased,
This increases the diameter of the common objective lens 11, its design, to come to interfere with the production. Therefore, the value of angle θ is
The limit was about 30 °. Also, for illumination and image rays
If a different objective lens is used for
However, the objective lens for the image
Since the observation surface is to be observed from an extremely oblique direction,
The entire visual field cannot fit within the depth of field of the lens
Therefore, the observable range becomes narrower.

[0007] As a result, even expand the field width W seen on folding angle the observed surface, good focus range becomes rather narrow, it is impossible to obtain the effect of expanding the field width. The present invention
It is intended to widen the visual field width and to obtain an image of a corneal endothelial cell which is practically in focus over the widened visual field width.

[0008]

According to the present invention, as in the conventional device, the oblique direction with respect to the central axis of the eyeball
Irradiating the illumination light through the slit, to obtain an image light from the direction towards the opposite with the illumination light for the central axis. A feature of the present invention is that separate objective lenses are used for illumination light and image light. And on the optical axis of the objective lens for image rays
The tilt with respect to the center axis is set to the center axis of the illumination optical axis.
The inclination is smaller than that, and the diameter is at least
An image of the central axis in a direction symmetrical to the illumination optical axis
Choose a size that can accept the light rays.

[0009]

As described above, by dividing the objective lens into one for the illumination light and one for the image light beam, even if the angle θ between the illumination light and the image light beam is selected to widen the field width W, the common objective lens can be used. Since it is not necessary to increase the lens lens aperture as in the case of using, the design and manufacture of the objective lens becomes extremely easy.

In addition, although the angle θ between the illuminating light and the image ray is selected to be large , the optical axis of the objective lens for the image ray is in the eyeball.
Since the tilt with respect to the core axis is relatively small, the tilt of the lens optical axis with respect to the observed surface is small, and as a result, the wide range of the observed surface is within the focal depth range of the lens, making it practically applicable over a wide range. You can focus. Therefore, in the present invention, the microscope visual field can be effectively expanded.

[0011]

EXAMPLES Referring to FIG. 1, 3 with respect to the central axis 2 of the eyeball 1.
A strobe light source 4, a condenser lens 5, a slit 6, a semitransparent mirror 7 and an illumination objective lens 23 are sequentially provided on an illumination optical axis 22 inclined by 0 °, and the illumination light of the strobe light source 1 is condensed. It is focused on the slit 6 by the lens 5, and the image of the slit 6 passes through the semitransparent mirror 7 and the objective 23
Is projected on the eyeball 1 to illuminate the eyeball 1 in a slit shape.

A light source 12, a condenser lens 13, an infrared filter 14, and a slit 15 are provided in this order on a branch illumination optical axis 16 which joins the illumination optical axis 22 by a semitransparent mirror 7. The illumination light is focused on the slit 15 by the condenser lens 13, and the visible light component is removed by the infrared filter 14 during that time. Slit 15
The infrared image of is reflected by the semitransparent mirror 7 and projected onto the eyeball 1 by the objective lens 23, and the eyeball 1 is illuminated with infrared rays in a slit shape.

On the image light beam optical axis 26 which is tilted about 20 ° in the direction opposite to the illumination light axis 22 with respect to the center axis 2 of the eyeball 1, the image light objective lens 25, the taking lens 20, and the photosensitive lens 20 are provided. Surface 2
1 and is disposed, the image light 24 is more paired objective lens 25,
The image is once formed on the flat surface 19 and then formed again on the photosensitive surface 21 by the taking lens 20.

[0014] Now, if image light line for a pair compound lens 25 is the light
The shaft 26 and the center axis 2 and the illumination optical axis 22 and symmetrical to have been kicked set <br/>, because the observed surface are considered perpendicular to the central axis 2, for the object to be observed surface Since the surface to be observed is inclined by 30 ° and a part of the surface to be observed goes out of the range of the focal depth of the lens, it becomes impossible to form an image of each part of the surface to be observed on the flat surface 19 satisfactorily.

[0015] However, by placing the optical axis 26 of the objective lens 25 as shown, is relatively small inclination with respect to the central axis, the 20 ° inclined position with respect to the central axis 2 In example embodiment,
The inclination of the optical axis of the lens with respect to the surface to be observed is reduced so that the surface to be observed is within the range of the depth of focus of the lens, and each part of the image of the surface to be observed can be satisfactorily combined on the plane 19. As a result, the width of the observable field of view could be expanded to about twice that of the conventional device shown in FIG. The unnecessary portion of the objective lens 25 hatched is
Unless it interferes with other optical paths, it is not necessary to remove it.

[0016]

As is apparent from the above embodiments,
According to the present invention, the width of the field of view that can be observed can be greatly expanded while avoiding the interference of the reflected light on the corneal surface.

[Brief description of the drawings]

FIG. 1 is an optical path diagram of an embodiment of the present invention.

FIG. 2 is an optical path diagram of a conventional eye microscope.

FIG. 3 is an explanatory diagram of a relationship between a corneal endothelial cell image light beam and a corneal surface reflected light beam of illumination light.

[EXPLANATION OF SYMBOLS] 1 eye 2 central axis 4 strobe tube 6 slit 7 semitransparent mirror 12 the light source 14 infrared filter 15 slit 20 taking lens 21 the photosensitive surface 22 illumination axis 23 illumination objective lens 24 images the light beam 25 image light objective Lens 26 Image objective lens Optical axis

Claims (1)

(57) [Claims] 1. Illumination of an eyeball inclined with respect to its central axis
Objective lens for illumination of illumination light that has passed through a slit along the optical axis
The image rays of the eyeball obtained by this illumination
Has an optical axis on the side opposite to the illumination optical axis with respect to the central axis
Eye configured to be captured by an objective lens for image rays
In a sphere microscope, the image axis objective lens optical axis
Inclination with respect to the central axis with respect to the central axis of the illumination optical axis
The tilt of the image beam objective lens
The aperture should be paired with at least the central axis and the illumination optical axis.
I chose a size that can accept the image rays traveling in the nominal direction.
Eyeballs microscope characterized.