JPS5861725A - Left and right position aligning apparatus of ophthalmic apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] In addition to matching the nine axes of the eye to be examined. Most conventional ophthalmological devices are for one eye. There are almost no examples of binocular lenses.

Especially for binocular use, position the ophthalmological device accurately against the eye being examined! j! Simple configuration for matching ijf tl
L @No sagging device was found.

The purpose of this invention is. To provide a positioning device with a simple configuration for accurately aligning left and right ophthalmological equipment W with respect to two eyes to be examined.

below. A detailed explanation will be given based on the embodiment shown in the drawings.

FIG. 1 is a side view of the embodiment of the present invention when it is attached to an ophthalmoscope, and FIG. 2 shows the main parts of the embodiment of the present invention as viewed from the arrow A-A in FIG. Fig. 3 is an example of Fig. 27, and Fig. 4 is an image when the noodles have been put together as observed by the festival viewing device.

In Fig. 1, a half mirror 1 is used to remove the eye E to be examined.
Like a downward reflection of the nine from the top of the eye to be examined/J! A four-object lens 2 is provided in the reflection optical path. This objective lens 2 is also used as an objective lens of an ophthalmoscope B, which will be described later, as an example in which the 0-lens embodiment is commonly used. Behind the objective lens 2 is a half mirror 6.
A pinhole 4 and a light source 5 for illuminating the pinhole 4 from behind are provided in the reflected optical path. The position of the pinhole 4 is determined such that when the subjective ophthalmoscope B (described later) is at the measurement position of the eye E to be examined, the position of the pinhole 4 is determined as the quotient and conjugate ( An observation optical path is formed between the half mirror 1 and the objective lens 2, and a yC path is formed in the observation optical path. An optical path changing beam 6 that bends the optical path downward is provided, and the back side 42 of the optical path changing beam 6 is located at the conjugate position of the pinhole 4 formed by the objective lens 2. There is a fixed objective lens 7, and a half mirror 8 is provided behind it.

As shown in Figure 2, half mirror 8 has 1M, source 9
The light from the objective lens 7 coincides with the light from the objective lens 7 by passing through the half mirror 8. Between the light source 9 and the half mirror 8 is a mark plate 1 on which a cross mark is formed on the thumb axis from the light source 911411 as shown in FIG.
0. On the mark plate 10 (2A'iJ side focal position shadows are matched), an object lens 11 is provided. The source from the half mirror 8 enters the source path changing history prism 16 of the festival viewing device t12. As can be seen from FIG. 2, the 9 positioning devices are provided corresponding to the left and right ophthalmological devices B, H' (FIG. 1 is a diagram of only 10,000 units), the left and right position detection devices WA,
A' is the ophthalmological costume [Ll, ll'
It is fixed in one piece. Therefore, the explanation of the 1M detection device f A' is based on the parts corresponding to device A. The explanation will be omitted by adding the following. The above-mentioned symmetrical arrangement (=Therefore, the element from the half prism 8 of the -10,000 tlI detector A and the element from the half prism 8 of the other 61W detector A match by 1.

The 8 matching position is the second quotient, up and down in the direction perpendicular to the page.
A switching prism consisting of a pair of prisms 15 and 13' is arranged. The original reflected by the prism 13 or 16' enters the 0M image lens 14. The image generated on the rear focal plane F of the M image lens 14 is observed with an eyepiece (not shown), an image pickup tube, or the like. On this occasion.

So that the intersection point of the bright spot and the cross mark coincides with T.

The positions of the pinhole 4 and the mark plate 10 in the direction perpendicular to the original axis are adjusted using a simulated sleep or the like. If an image pickup tube is used, the light source 1.9 can be configured to emit infrared rays. Qiansaito 12 is.

It may be fixed to either the position detection device A or A, or it may be fixed to the device main body (not shown) (2).In this example, the explanation will be made assuming that it is fixed to the device A. .

10,000, as shown in FIG. 1, the subjective ophthalmoscope @B as an ophthalmological device has a first imaging lens 29, a reflecting mirror 6, in the reflection source axis of the half mirror 1. A first diaphragm 21 having a pair of apertures 21α and 21b formed in the image rotation prism 200-axis narrow end.
゜Reflector 22. Second Mi#! Lens 26. Four Power Singbrism 24. A second diaphragm 25 formed with a pseudo-long sword-shaped opening 25α protruding from the center. Condenser lens 26. Light sources 27 are sequentially provided. The focusing prism 24 is provided so as to be movable in the direction of the original axis (marked with an arrow in FIG. 1).
The movement of 4 (2) allows the position of the second aperture 25 relative to the first aperture 24 (2) to be changed, thereby measuring degrees eY.

Also, the rotation of the image rotation prism 20 causes the first aperture 2
The effect is similar to that of rotating around 1 point l1iIIIl, resulting in astigmatism! To measure Ill, since this is the type of printing, the measurer first inserts the prism 13 into the optical path. While observing the image plane 1w through the entire half mirror 1 as if the subject were looking at the previous issue 7, the bright spot caused by the pinhole 4 and the intersection point of the mark plate 10 (see Fig. 4) The device is moved six-dimensionally (by using a well-known technique) with respect to the subject who is fixed on a fixed stand (not shown) so as to align with the center of the subject's eye E as shown in the figure. When an image like that shown in Figure 4 is observed, the position adjustment is complete.At this time, the subjective ophthalmoscope B
The line 21 is set to be conjugate with the corneal surface of the eye E to be examined by the objective lens 2. As a result, the subjective ophthalmoscope B is placed in a measurable position. Next, by inserting a prism 13' into the optical path instead of the prism 13 and performing the same operation as described above, it is possible to align the other ophthalmoscope B, although this is not shown. A diaphragm having two apertures of the optometrist B' becomes conjugate with the corneal surface of the eye E'.

In such a state, an image as shown in FIG. 5 (α), for example, is presented to the subject undergoing astigmatism MT at a certain time (the fifth portion of the diagonal line is bright).

In this case, the direction of the astigmatism axis of the eye E to be examined is.

A state in which the direction of the aperture of the diaphragm 21 does not match.

T, the most common condition.

Therefore, I created Four Power Singbrism 24'1tjJ
Tru. Then, as shown in Figure 5 (6), the two images are
Then press the sea bream or T until the subject responds.

At that time, the moving type of the lens corresponds to the eye refractive power of the eye E to be examined.

Next, rotate the image rotating prism 20 and move it until the subject responds that the two images perfectly match (see Fig. 5(C)).
). The rotation angle of the diaphragm 21 at this time corresponds to the direction (2) of the astigmatic principal axis of the eye E to be examined.

Therefore, by the above-described operation, it is possible to know the direction of one principal meridian of astigmatism in the astigmatic eye E and the eye refractive power in this direction.

Next, the source rotating prism 20 is rotated further (290''), and the focusing prism 24Y is activated until the subject responds that the two images match.
--The eye refractive power in the direction of the other astigmatic principal meridian can be determined by the position of the Kasink frism 2.

In other words, if the direction of the aperture of the diaphragm 21 is the direction of the 10,000 principal astigmatic meridian of the subject's eye B (if there are two lines, the subject will be able to
．． An image like d) can be observed.

Therefore, in this case (2), it is possible to see the concentric image as shown in FIG. , the statue of Pjri is the fifth
Since it is not observed twisted as shown in figure (α), it is always only the child who corresponds to the degree (1).

It will be observed from a distance J' as shown in Figure 5).

Note that if the light is turned off when the first position alignment is completed, the subject will be able to see the aperture 25aO) of the second aperture 25,
] can be observed.

As mentioned above, the present invention)
When the left and right position detector casings move out of order, the ejected sources from the left and right position detectors may not be on the same straight line due to mechanical guidance errors, or when switching the switching prism, the upper and lower Guidance of movement and guidance of one rotation movement (-Due to looseness, even if the prism rotates slightly, the distance between the 9-position detection device &A<4 and observation thread 12 is parallel thread, and Scrolling indicator (in the embodiment, a cross mark on the mark plate 10).

Due to the provision of the projection mark (bin ball 4 in the embodiment) and the position IjIt adjustment index and Q] generated on the image plane F, the position within the screen changes;
Since there is no relationship between fit and f (the original from the eye to be examined is the shadow of one reflection on half mirror 8, the mark plate 10Q)'9 (the influence of the first pair of devices is You'll get almost twice as much.

For example, it is necessary to correct the focal length of the lens 11 by doubling the focal length of the lens 7, etc.2. Therefore, it is possible to obtain a tributary alignment device with a structure that allows alignment at a high flit degree without being affected by the force of mechanical guide surfaces, etc. I can do it.

[Brief explanation of the drawing]

Fig. 1 is a side view of an embodiment of the present invention when it is attached to a fully subjective ophthalmoscope; Fig. 2 is a view taken along arrow A-A in Fig. 1 showing the main parts of the embodiment of the present invention; The figure shows the cross mark on the mark plate, FIG. 4 is a diagram of the image observed by the observation device when alignment is completed, and FIG. 5 is an explanatory diagram of the image observed by the subject. [Explanation of symbols of main parts]

Claims (1)

[Scope of Claims] In an apparatus for aligning each ophthalmological device with a corresponding eye to be examined by independently moving five right ophthalmological devices t, a first mark is projected onto the eye to be examined. 1 objective lens. The first objective lens (the second objective lens whose front focal position tM is aligned with the position conjugate with the first mark) and the second objective lens whose front focal position tM is aligned so that the autopsy focal position is aligned with the second mark. a sixth lens arranged at 1?l; and a round member located behind the second objective lens and the third objective lens, and on which the base of each lens is placed. In addition to providing it integrally with the ophthalmological device symmetrically on the left and right sides, a facial expression device for at least an objective lens for image formation is provided between the round-shaped members of the left stone of the erasure, and The first mark, the second mark, and the eye to be examined are generated on the focal plane of the cutting lens for recording lees.From the fg, Positioning device +!