JP3470980B2 - Ophthalmic equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus, and more particularly, to an ophthalmologic apparatus having a fixation target optical system such as a refractometer for fixing an eye to be inspected.

[0002]

2. Description of the Related Art In a conventional ophthalmologic apparatus of this type, a fixation target consisting of a starburst image and a landscape image is displayed on a display section of a fixation target optical system and presented to the eye to be examined, and the eye is fixed. As a visual state, it is usual to perform various types of optometry such as distance vision.

[0003]

However, when using the above-mentioned fixation target in the conventional ophthalmologic apparatus,
Since this fixation target is flat and does not have a three-dimensional effect or a visual line guiding effect, the line of sight of the subject's eye cannot be determined or the accommodation power is working, and the distance vision of the subject's eye is measured. There was a problem that could not be done accurately.

Therefore, an object of the present invention is to provide an ophthalmologic apparatus which can surely match the line of sight of the eye to be inspected with the measurement optical axis and can perform accurate eye examination.

[0005]

The invention according to claim 1 is
The ophthalmic device having a fixation target optical system for performing fixation of the eye to be examined gaze fixation target by the fixation still or moving the outer peripheral portion have a target is blurred in the heart to face the target optical system It is equipped with.

According to a second aspect of the present invention, the fixation target is
Move closer to the target from a position far from the target in the heart
Formed so that it changes from a beamed state to a clear state
Is.

According to a third aspect of the invention, the line of sight of the eye to be examined is fixed.
In an ophthalmologic apparatus having a fixation target optical system for performing vision,
When the target object is placed in the central part facing the fixation target optical system,
At the same time, the line of sight of the eye to be inspected is guided to the target area around this target object.
The guide target is provided with a fixation target in which a guide target to be guided is arranged.
Is a blurred state at a position far from the target.
It is what has been.

[0008]

The function of the present invention will be described below.

According to the ophthalmologic apparatus according to claim 1, the outer peripheral portion have a target is provided with a fixation target by <br/> still or moving blur in the center for exposing the fixation target optical system Therefore, at the time of eye examination, it becomes easy to fix the line of sight of the eye to be inspected by visually recognizing the target object in the center through the outer peripheral portion of the eye to be inspected, and thereby, to perform accurate eye examination of the eye to be inspected. It can be carried out.

According to the ophthalmologic apparatus of the second aspect , the fixation target
To approach the target from a position far from the target in the center
Formed to change from a blurred state to a clear state
Therefore, the line of sight of the eye to be examined is naturally guided to the target in the center.
It becomes easier to fix and match the measurement optical axis.
As a result, it is possible to perform an accurate optometry of the subject's eye.

According to the ophthalmologic apparatus of the third aspect, the guided vision
A target was provided, and this guide target was blurred at a position far from the target.
Since the state is formed, the viewpoint of the eye to be inspected can be more accurately confirmed.
You can really fix it.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the arrangement of an optical system of an ophthalmologic apparatus which functions as a refractometer. In FIG. 1, 6 is a projection optical system for forming a ring-shaped image on a fundus Er of an eye E to be inspected. A system 2 is an imaging optical system for forming an image of the fundus Er on a CCD (image sensor) 3 as a two-dimensional image sensor, and a system 4 is an imaging optical system for fixing the eye E to be examined in a far-sighted state. Reference numeral 5 denotes an observation optical system for observing the anterior segment Ea of the eye E to be inspected.

The projection optical system 6 includes a perforated mirror 6, an infrared light LED light source 7, a relay lens 8, a conical prism 9, a ring-shaped aperture stop 10, a relay lens 11, and an objective lens 2.
1, the imaging optical system 2 includes an objective lens 21, a perforated mirror 6, a relay lens 13, and a CCD 3, and the fixation target optical system 4 includes an objective lens 21 and an infrared transmission visible reflection mirror 1.
4, a relay lens 15, a rotationally driven fixation target plate 16,
It consists of a light source 17.

The observation optical system 5 for the anterior segment of the eye is the objective lens 2
1, half mirror 20, relay lens 22, imaging unit 1
8, consisting of monitor TV 19, ring-shaped aperture stop 1
0 and the fundus Er, the CCD 3 and the fundus Er, the infrared light LED light source 7, the perforated mirror 6 and the eye pupil Ep to be examined are in a conjugate relationship.

During the measurement, the image of the anterior segment Ea is always displayed on the screen of the monitor TV 19, and the examiner can appropriately monitor whether or not the anterior segment Ea is in a predetermined position. You can do it.

FIG. 2 is a block diagram showing the signal processing system of the ophthalmologic apparatus 1. In FIG. 2, reference numeral 40 is a CPU for controlling the whole, and this CPU 20 allows the CCD to operate.
A / D conversion unit 41 for converting the signal from 3 into a digital signal, a calculation unit 42 for calculating sphere, astigmatism, astigmatic axis angle, etc., a memory 43, an operation unit 44, the light source 17, the imaging unit 18 The monitor television 19 and the like are controlled.

Next, a detailed description will be given of the fixation target 50 which is provided on the fixation target plate 16 in a multi-circular arrangement and faces the optical path of the fixation target optical system 4.

The fixation target 50 shown in FIG. 3 is circular and has a house 51 colored in red at the center thereof as a target, and the line of sight of the eye E to be inspected is guided to the house 51 in front of the house 51. A guide 52 is provided with an upslope ground 52 reaching a central house 51 as a guiding target, and a white-colored fence 53 arranged along the ground 52 and having a narrow front side and narrowing toward a target object. It is formed by still images. A sky 54 is attached to a region above the horizon formed by the ground 52.

The ground 52 and the sky 54 are the houses 5 at the center.
The color tone changes from dark to light as it gets closer to the house 51 from a position far from 1 (indicated by a change in the line interval).
I am trying. A green-based color such as emerald green is used as the color of the ground 52, and a blue-based color such as sky blue is used as the color of the sky 54.

By presenting such a fixation target 50 on the optical axis of the fixation target optical system 4 and visually confirming the eye E to be inspected so that the red house 51 in the center is visually recognized, the eye E to be inspected It becomes easy to fix the line of sight of the eye to the house 51 and match it with the measurement optical axis, whereby the eye E to be inspected can be accurately examined.

Further, an upslope ground 52 reaching the house 51 at the center as a guiding target, and a fence 53 using a stake arranged along the ground 52 and having a spacing narrower toward the house 51 are used. In addition, the ground 52 is colored in green and the sky 54 is colored in blue, and the shade is changed from a dark state to a light state as the house 51 is approached. It gives a feeling and fixes the line of sight to the house 51 at the center in an extremely natural state, which makes it easy to match the line of sight of the eye E with the measurement optical axis, and the eye E An optometry can be performed.

Further, by forming the fence 53 so as to change from a position far from the house 51 in the central portion toward the house 51 to a clear state,
The line of sight can be more effectively guided and fixed to the house 51 at the center.

In addition to the fixation target 50 described above, the shapes of the target object and the guide target are the vehicle 61 and the road 6 shown in FIG.
Fixation target 50A with 2 and fixation target 50 with airplane 63 and runway 64 with light box 65 shown in FIG.
B, a fixation target 50C with a ship 66 shown in FIG. 6 and a marine-colored sea 67 having a wake with ripples, FIG.
A fixation target 50D with a train 70 and a track 71 shown in FIG. 8, a fixation target 50E with a house 81 shown in FIG. 8 and a road 82 having a row of trees 83 made of shrubs on both sides can be used.

Also in the case of these fixation targets 50A to 50E,
Coloring of each target and each guide target, change in color tone, and change in the interval between the light box 65 and the row of trees 83 are determined by the fixation target 50.
Needless to say, the fixation target 50A to 50E can be used to give a stereoscopic effect to the eye E to be examined and naturally guide the line of sight to the target object at the center to fix it on the measurement optical axis. It is easy to match them, and thus the eye E to be inspected can be accurately examined.

Next, in relation to the fixation target 50D with the electric train 70 and the track 71 shown in FIG. 6, the target object in the central portion facing the fixation target optical system 4 is changed in size in multiple steps. The fixation target group 100 including a plurality of still images will be described.

In this fixation target group 100, as shown in FIG. 9, the train 70 at the center changes in size in multiple stages.
It consists of a sheet of fixation target 101A, 101B, 101C.

The fixation target 101A is in an approaching state in which the adjusting force of the eye E is exerted on the central portion (the head lamp is indicated by a white circle).
A large-shaped electric train 70a is attached, and a rail 105 as a guide target is provided in front of the large electric train 70a as the distance between the sleepers becomes closer to the electric train 70a.

The fixation target 101B has a medium shape train 70 which shows a state of moving away (a tail lamp is indicated by a black circle) in a middle shape where the accommodation force of the eye E to be inspected is zero at the center.
b is provided, and in front of this, a track 105 is provided as a guide target that becomes narrower as the distance between the sleepers gets closer to the train 70b.

The fixation target 101C has a dark tunnel 106 in which a train 70b for clouding the eye E to be inspected disappears in the center.
It has a slight shape (illustrated by being painted out in black), and further has a line 105 as a guide target for narrowing the interval between the sleepers leading to the tunnel 106.

Such three fixation targets 101A, 101
B and 101C are switched at an appropriate timing so that the fixation target optical system 4 faces the optical path, so that the line of sight of the eye E to be inspected is reliably fixed to the target object with a moving image change, and is aligned with the measurement optical axis. It becomes easy to cause the action to be performed naturally, and it is applicable when the rough measurement and the main measurement of the eye E to be inspected are performed by the ophthalmologic apparatus 1, and the rough distance visual acuity of the eye E to be inspected and the eye to be inspected are roughly determined. The accurate distance vision of E can be reliably grasped.

Instead of the fixation target group 100 described above, FIG.
As shown in, it is also possible to use a fixation target group 110 composed of three fixation targets 111A, 111B, and 111C in a state where a human image jumps in three steps.

At the center of the fixation target 111A, a slightly large figure human image M1 in the hop state, and at the center of the fixation target 111B a medium image human figure M2 in the stepped state.
At the center of the fixation target 111C, a person image M3 having a small jumping shape is attached.

Such three fixation targets 111A, 111
Even when B and 111C are switched at an appropriate timing so that the fixation target optical system 4 faces the optical path, the line of sight of the eye E to be inspected is surely fixed to the target object with a moving image change to match the measurement optical axis. It becomes easy to naturally cause the effect of fog, and the same effect as in the case of the fixation target group 100 can be exhibited.

Further, as shown in FIG. 11, for example, a fixation target 101B1 in which a train 70b1 having a shape larger than the train 70b of the fixation target 101B is attached to the center and the fixation target 101B are prepared, By appropriately replacing these, it is possible to deal with a myopic subject whose strength is difficult to be visually recognized in the case of the fixation target 101B.

In addition to the above, the present invention can be variously modified within the scope of the gist thereof.

For example, the display means for displaying the fixation target in the form of computer graphic is made to face the optical path of the fixation target optical system 4, and various fixation targets as described above are presented to the eye E to be fixed. It is possible to eliminate the discontinuity at the time of switching the optotypes and to perform an accurate optometry of the eye E to be inspected while eliminating the discomfort associated with the switching of the fixation targets.

When the fixation target group 100 is used, the fixation target 101A among the three fixation targets 101A, 101B, 101C is controlled to be dark and the fixation target 101B is displayed brightly. Therefore, the line of sight of the eye E to be inspected can be more reliably fixed to the target object and can be matched with the measurement optical axis with a more reliable moving image change.

A moving image can also be used as the fixation target.

The present invention also provides a fundus camera, an tonometer,
It can be applied to various ophthalmologic devices such as keratometers and corneal shape measuring devices.

[0041]

According to the present invention described above, the following effects can be obtained.

According to the present invention, the line of sight of the eye to be examined is naturally centered.
It is easy to guide and fix the target to the target in the heart and match it with the measurement optical axis, and thus it is possible to provide an ophthalmologic apparatus capable of performing an accurate optometry of the subject's eye.

[Brief description of drawings]

FIG. 1 is an optical layout diagram of an apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a signal processing system of an apparatus according to an embodiment of the present invention.

FIG. 3 is a plan view of a fixation target used in the device according to the embodiment of the present invention.

FIG. 4 is a plan view of a fixation target used in the device according to the embodiment of the present invention.

FIG. 5 is a plan view of a fixation target used in the apparatus according to the embodiment of the present invention.

FIG. 6 is a plan view of a fixation target used in the device according to the embodiment of the present invention.

FIG. 7 is a plan view of a fixation target used in the device according to the embodiment of the present invention.

FIG. 8 is a plan view of a fixation target used in the device according to the embodiment of the present invention.

FIG. 9 is an explanatory diagram of a fixation target group used in the apparatus according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram of a fixation target group used in the apparatus according to the embodiment of the present invention.

FIG. 11 is an explanatory view showing a case where the fixation target is replaced in the apparatus according to the embodiment of the present invention.

[Explanation of symbols]

1 Ophthalmic device 4 Fixation target optical system 16 fixation target plate 50 fixation target 51 houses 52 ground 53 fences 54 sky E eye to be examined

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Claims (3)

(57) [Claims] 1. A ophthalmic device having a fixation target optical system for performing fixation of the eye to be examined sight, the fixation still image peripheral portion have a target in the center to face the target optical system is blurred or An ophthalmologic apparatus comprising a moving image fixation target. 2. A fixation target optical system for fixing the line of sight of an eye to be examined.
In an ophthalmologic apparatus having a
Still image or video with a target in the center and blurred outer periphery
According to the above-mentioned fixation target , the fixation target is a target from a position far from the target in the center.
It will change from a blurred state to a clear state as soon as
An ophthalmic device formed as described above. 3. A fixation target optical system for fixing the line of sight of an eye to be examined.
In an ophthalmologic apparatus having a
The target is placed in the center of the
Guidance target that guides the line of sight of the eye to the target is placed on the side
And the guide target is far from the target object.
It is characterized in that a blurred state is formed at the position
Ophthalmic device to do.