JPS6021736A - Self-conscious eye refractive force measuring 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 Field of the Invention The present invention relates to a subjective eye refractive power measuring device, that is, a subjective eye refractive power measuring device configured to project onto the ocular fundus.

BACKGROUND ART An example of a conventional subjective eye refractive power measurement device is to project a power measurement chart onto the fundus of the examinee's eye using a projection lens system, and to place the chart image in focus on the fundus of the examinee's eye for 1ift.
That is, the chart is moved on the optical axis of the projection lens system to a position where the subject can clearly see the chart. For this adjustment, there is a method that measures the eye refractive power by detecting in which direction and by how much the chart has moved from a reference position corresponding to a diopter of 0.

Another example of the conventional subjective auxiliary refractive power measuring device is that in the above conventional example, instead of moving the chart on the optical axis, lenses with different refractive powers are selectively inserted on the optical axis. aI from the refractive power of the lens! There is a Km-formed lens for measuring refractive power.

However, in conventional devices, it is necessary to judge whether or not the chart image is focused on the bottom of the IR of the patient's eye based on the degree of blur in the chart image; This is difficult for those who are skilled in the art, and high-precision measurements cannot be expected.

Still another example of a conventional subjective eye refractive power measurement device is a device that uses a two-hole diaphragm that distributes the light beam from one chart to a position conjugate to the pupil of the eye to be examined, in order to solve the problems of the conventional device described above. There is one that is configured to project onto the fundus of the eye test III.This means that when the light beam from the chart is focused on the fundus of the eye to be examined, the two chart images coincide and form an image on the fundus of the eye to be examined. However, when it is not in focus, one chart image is separately formed, and therefore the in-focus state of the chart image can be easily and accurately determined.This is a so-called matching type subjective refractive power measuring device. be.

However, in the above-mentioned matching type subjective refractive power measuring device, the optical axis of the measuring device and the optical axis of the eye to be examined are made to match in order for the constant light flux that has passed through the hole diaphragm to pass through the IIR light to be examined. There is a problem in that so-called alignment adjustment must be performed, making measurement operations difficult.

OBJECTS OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a subjective refractive power measurement device that can easily measure refractive power with high accuracy and that does not substantially require so-called alignment adjustment. The purpose is to

Structure of the Invention According to the present invention, an eye refraction power chart is provided; The light beam transmitted through the aperture of the diaphragm causes the object 111iIII! It consists of a projection lens system for projecting the chart image onto the bottom.
The aperture of the diaphragm is the object 1111 [1t
A subjective eye refractive lens characterized in that it is arranged in an area wider than the size corresponding to the i- and is configured to always include an aperture of Ω or more in the size corresponding to the ilR pupil to be examined. A fixed device is provided.

Embodiment 1 Embodiment 1 has a configuration in which a circular aperture image is formed over a much wider area than the pupil on a plane containing the n4 pupil to be examined. Fig. 1 shows the optical system of the first embodiment. It is a perspective view of the optical system R2L, which consists of an optical system R for the right eye to be examined and an optical system R2 for the left eye to be examined.Both optical systems R2L have the same configuration, and a light source 10. A chart board with a cross mark 12 illuminated by a light source 10 and placed near a position conjugate with the bottom 19 of the FIIJ to be tested
a multi-hole aperture plate 8 having a circular hole 16; a relay lens 20 that forms an image of the cross index 12 near a position 21 conjugate with the fundus 19 of the eye to be examined; A projection lens 24 projects 16 images onto the subject 011m22. As shown in FIG.
For example, it is divided so that it contains ``g''.

In the above configuration, when the cross mark 12 of the chart board 14 is focused and projected onto the fundus 19 of the eye to be examined, an image of only one cross mark 12 is formed. On the other hand, when projected out of focus, the subject [11i! Image 16' of circular hole in 1Kt22
Images of the cross marks 12 as many as the number are formed at different positions. By the way, as shown in FIG.
6', the position of the pupil 22 of the eye to be examined is on the optical axis L.
The light beam passing through the circular hole 16 can be imaged on the fundus 19 of the eye to be examined even if it deviates considerably from O, RO.

In the apparatus of the above embodiment, the chart board 14 is moved on the optical axes RO and LO in response to the test subject's response, or the chart board 14 is moved by the test subject himself, so that the image of the cross mark 12 can be seen in the fundus of the test eye. Focus on 19. At this time, the refractive power of the eye to be examined can be measured from the amount of movement of the chart board 14 from the position of the refractive power O. At this time, if the focus of the lens 20 on the subject's eye side is placed at a position conjugate with the pupil of the lens 40,
The moving distance of the chart is linear with the principal point refractive power of the subject p, while at a position conjugate with the glasses wearing position, the refractive power of the subject's eye and the moving distance are linear.

This measurement method is also used in Examples A to B below.

The fourth embodiment is constructed by replacing the crest plate of the first embodiment with an aperture plate having a plurality of parallel slits. The projection magnification of the diaphragm plate onto the pupil of the subject's eye is determined so that at least λ slit images 52 of the diaphragm plate image 50' are on the subject's eye lIφ22, as shown in FIG.

In the above configuration, the cross index image 12 is the fundus 19 of the examined eye.
When focused and projected, an image of only one cross mark 12 is formed, as in the first embodiment.

On the other hand, when the cross mark 12 is projected onto the fundus 19 of the subject's eye without focusing, the images of the cross mark 12 as many as the images 52 of the slit in the pupil 22 of the subject 11F are projected in a direction perpendicular to the slit direction. The images are shifted from each other.

The third embodiment is constructed by replacing the aperture plate of the first embodiment with an aperture drive that rotates an aperture disk having a plurality of circular holes. As shown in FIG. 7, the aperture disk 100 has a number of circular holes in the circular hole zone 102, and the optical axis LO (RO) passes through the middle of the circular hole zone.

In the above configuration, the refractive power is measured while rotating the aperture disk 100 around the rotation center O. When the cross mark 12 of the chart board 14 is focused and projected onto the bottom 1 and top 9 of the eye to be examined, a single fixed cross mark image is formed. On the other hand, when projected in an out-of-focus state, the plurality of cross-shaped index images are separated and simultaneously moved in the vertical direction.

The second embodiment is constructed by replacing the aperture plate of the first embodiment with an aperture device that rotates an aperture disk having a plurality of slits in the radial direction. As shown in FIG.
54, and the optical axis LO (R
O) passes.

In the above configuration, the refractive power is measured while rotating the aperture disk 150 about the rotation center 0. When the cross mark 12 of the chart board 14 is focused and projected onto the fundus 19 of the eye to be examined, a single fixed cross mark image is formed.

On the other hand, when projected in an unfocused state, the in-focus state can be detected more easily than when the plurality of cross-shaped index images move along a single vertical axis and the cross-shaped index 12 is fixed.

The third embodiment is constructed by arranging a pair of finger tanks and a diaphragm on different optical axes. Figure 6, which shows the fTl embodiment, is 'fk test III' for either the left or right side! This shows an optical system for measuring the refractive power of. That is, the optical system of the 2Q Shio embodiment includes a first light source 200 distributed to the first optical axis O4, and a first chart that is illuminated by the first light source 200 and is movably arranged near a conjugate position with the fundus 202 of the eye to be examined. Board 204
, a first relay lens 206 that images the first chart plate 204 at a position conjugate with the fundus 202 of the eye to be examined, and a pupil 208 of the eye to be examined.
a first multi-hole diaphragm plate 210 arranged conjugately with the first multi-hole aperture plate 210, and a 29th multi-hole diaphragm plate 210 arranged on the λ-th optical axis 02 with the same configuration as the first optical axis 0°.
in.

source 212, first chart plate 204, second relay lens 2
16 and a second porous aperture plate 218.

The optical system of the third embodiment is further arranged on the second optical axis 02 so that the λ-th optical axis 02 is the first optical axis 0. a mirror 220 that bends in the direction of and transmits the light beam along the first optical axis O5,
Half mirror 2 that reflects the light beam along the optical axis 02
22, the first chart board 204 and the second chart board 21
4 is projected onto the fundus 202 of the eye to be examined, and the first porous aperture plate 2
It includes a projection lens 224 that projects the 10th and λ-th multi-hole aperture plate 218 onto the pupil 208 of the subject's eye.

As shown in FIGS. 7A and 7B, the first chart board 204 and the first chart board 204 each have a circular arc-shaped slits 230, 232. and 234°236, and the two arc-shaped sulins) 230°232.234.2
When 36 are put together, they form one ring. The first multi-hole aperture plate 210 and the second multi-hole aperture plate 218 each have a plurality of circular holes 210A.

218A, and the circular hole 210A.

The position of 218A is such that when projected onto the pupil 208 of the eye to be examined, the horizontal rows of foramen images 210A' and the horizontal rows of foramen images 218A' are arranged alternately in the vertical direction, as shown in Fig. It can be decided. Also, circular hole 21OA.

The size and interval of 218A are such that the foramen images 210 A'' and 218 A'
It is decided that each number will be included in each. Further, the first chart board 204 and the first chart board 204 are configured to move together on their respective optical axes.

In the above configuration, when the first chart board 204 and the arithmetic chart board 214 are focused and projected onto the test subject II, "llF! bottom 202, one annular chart image is formed. When projected in focus, a chart image of two or more circles is formed.

The sixth embodiment uses a polarizing plate having polarization axes in λ directions perpendicular to one optical axis, whereas the chart projection light flux is composed of two light fluxes along a optical axis in the third embodiment. The chart projection light beam is constructed by arranging the following. That is, in the sixth embodiment, as shown in FIG.
A light source 250 on the optical axis O, a ring slit plate 252 illuminated by the light source 250, a ring slit @, 252
A relay lens/e2.56 that forms an image of the eye at a position conjugate with the fundus 254 of the eye to be examined; , a projection lens 262 that projects the multi-hole diaphragm plate 260 onto the first examination pupil 258. As shown in FIG. 70, the ring slit plate 252 is divided into equal parts by a line passing through the center of the ring slit 264, and each divided portion has a polarization axis in the direction shown by the arrow in FIG. A polarizing plate is attached.

On the other hand, a polarizing plate having a polarizing decoy 1 in the direction shown by the arrow in FIG. 1 is attached to each of the plurality of circular holes 266 of the multi-hole aperture plate 260. Furthermore, the size and interval of the plurality of circular holes 266 are such that when the multi-hole diaphragm plate 260 is projected onto the subject's eye pupil 258, there are approximately the same number of circular holes 26 as there are in the pupil 258 of the subject's eye.
It is decided that 6 statues will be included.

In the above configuration, when the ring ring) [252 is projected onto the subject's eye fllJ bottom 20 base 02, one ring chart image is formed, and when it is projected out of focus, 21+'
or more circular chart images are formed.

In the above-mentioned embodiment, polarization was used as a means for division, but it is also possible to divide by wavelength. That is, instead of the polarizing plate shown in Fig. 7θ, two
1) Paste one or three types of filters on a slit plate, and in the plurality of circular holes 266 of the multi-hole diaphragm 260, wavelength selection filters are installed that transmit only light beams of seven wavelengths out of a plurality of different wavelengths. By arranging them alternately, it is possible to obtain the same effect as in the above embodiment.

As shown in Fig. 1, in the seventh embodiment, instead of moving the chart plate 14 of the first embodiment, lenses 300 with various refractive powers are installed before and after the diaphragm plate 18 on the test object 111N side. It is selectively inserted into the turret type. At this time, if the lens 24 is placed in a position conjugate with the eye's ocular position, the refractive power of the lens 300 becomes the corrective refractive power of the eye to be examined. In FIG. 72, the same members as in the first embodiment are given the same reference numbers and their explanations will be omitted.

In the gth embodiment, as shown in FIG. 73, instead of operating the mark/chart plate 14 of the embodiment, a lens 400 with various refractive powers is provided between the pupil 22 of the eye to be examined and the projection lens 240.
is selectively inserted into the turret type. At this time, as in the seventh embodiment, if the lens 400 is placed in the eyewear position, the refractive power of the lens 400 becomes the corrective refractive power of the eye to be examined. Also in FIG. 73, the same members as those in the first embodiment are given the same reference numerals, and the explanation thereof will be omitted.

Examination eye fundus 1 of cross finger f4'12 of seventh and Sth embodiments
The imaging state in 9 is also the same as in the first embodiment. And the reference refractive power of the inserted lens 300 or 400,
The desired refractive power can be determined from the difference between the refractive power of the lens inserted when a certain test IN is focused.

Effects of the Invention Since the present invention is configured as described above, by detecting the coincidence of the target images, it is possible to easily and reliably detect the focused state of the target image in the subject's IN eye fundus, and to improve the refractive power. Measurements can be performed efficiently and with high precision. Further, alignment adjustment to align the optical axis of the eye to be examined with the optical axis of the measuring device is substantially unnecessary. That is, according to experiments conducted by the present inventor, alignment within the range of conventional 10, NM)
T? The device of the present invention (
According to Akira, measurement is possible if it is within the range of /θ and θ, and in general, it is the same as when looking normally through the eyepiece of the measuring device before the measurement. The large allowable range of alignment adjustment has the advantage that interpupillary distance adjustment can be made unnecessary, especially in an apparatus that simultaneously measures the refractive power of both eyes as in the first embodiment.

[Brief explanation of the drawing]

'Figure 1 is a perspective view of the optical system of the first embodiment of the present invention, and Figure 2 is a perspective view of the optical system of the first embodiment of the present invention.
The figure is an explanatory diagram of the aperture plate image in Figure 1, Figure 3 is an explanatory diagram of the aperture plate image in the λth embodiment, Figure 7 is a plan view of the aperture disc in the third embodiment, and Figure S is the FIG. 6 is an optical diagram of the third embodiment. FIGS. 7A and 7B are plan views of the chart plate of the S embodiment. FIG. 3 is a plan view of the aperture disk of the S embodiment. Theory and layout of the aperture plate, Figure 9 is an optical diagram of the sixth embodiment, Figure 1θ is a plan view of the ring slit plate of the sixth embodiment, and Figure 1/ is a diagram of the perforated aperture plate of the sixth embodiment. A plan view, FIG. 7.2 is an optical diagram of the seventh embodiment, and FIG. 73 is an optical diagram of the second embodiment. 18...Porous aperture plate 19...Test 01! Fundus 22... Pupil of the eye to be examined 2400. "'Projection lens 100...Aperture disk 204...First chart plate 214...First chart board 4th figure, 5th figure

Claims (1)

[Scope of Claims] /) A chart for measuring eye refractive power, a diaphragm having a plurality of apertures arranged at positions substantially conjugate with the pupil of the eye to be examined on the optical path of the projected light flux from the chart, and an aperture of the diaphragm. a projection lens system for projecting a chart image onto the bottom of the eye to be examined using a luminous flux transmitted through the aperture; A subjective eye refractive power measurement device characterized in that the device is configured to always include apertures of a or more apertures within a size corresponding to the pupil of the eye to be examined. , 2) The subjective clothing refractive power measuring device according to claim 1, wherein the aperture of the diaphragm is circular. 3) The subjective eye refractive power measuring device according to claim 1, wherein the aperture of the diaphragm is slit-shaped. A subjective eye refractive power measuring device according to any one of claims 1 to 3. Left) The subjective eye refractive power measurement according to any one of claims 1 to 7, wherein the eye refractive power measurement chart is configured to be movable in a direction perpendicular to the optical axis of the projection lens system. Device.