JP7256723B2 - Visual target presentation device and optometry device - Google Patents

Description

The present invention relates to a visual target presentation device and an optometry device.

2. Description of the Related Art Conventionally, there has been known a target presentation device that includes a target plate suspended from a support rod whose one end is held by a subjective optometric device (see, for example, Patent Document 1). In this conventional optotype presentation device, a storage case containing optotype plates is supported by a moving member slidably attached to a support rod. Further, the moving member has a slide hole through which the support rod penetrates and is in slidable contact with the support rod. In the conventional optotype presenting device, the moving member is moved along the support rod so that the distance from the subjective optometric device to the optotype plate can be adjusted.

JP-A-10-276983

By the way, in the conventional optotype presentation device, the storage case containing the optotype plate is supported by the moving member, and the supporting rod passes through the sliding hole of the moving member. Therefore, in order to replace the optotype plate, it is necessary to remove the moving member from the support rod and replace the optotype plate housed in the storage case together with the moving member. For this reason, when the optotype plate is replaced, the moving member deviates from the adjusted position. Therefore, it is necessary to move the moving member each time the optotype plate is replaced, and to readjust the distance from the subjective optometric device to the optotype plate. There was a problem that there was

Further, in the conventional optotype presentation device, even if the optotypes are provided on both the front and back surfaces of the optotype plate so that the optotype plate can be used by reversing the optotype plate, when the optotype plate is to be reversed, the supporting rod must be removed. It is necessary to once pull out the moving member, turn over the optotype plate, and then reinsert the support rod into the sliding hole. Therefore, even when the optotype plate is reversed, the moving member is displaced from the adjusted position.

The present invention has been made in view of the above-mentioned problem, and provides a visual target presentation device and an optometry device that do not require adjustment of the distance from the subjective optometric device to the optotype plate when the optotype plate is reversed or replaced. intended to provide

In order to achieve the above object, a visual target presentation device of the present invention comprises a support rod, one end of which is held by a subjective optometry, and which extends parallel to the visual axis of an eye to be examined; an attached sliding portion; an optotype plate having optotypes provided on the front surface and the back surface thereof; a first presentation state in which the surface of the optotype plate faces the subjective optometry machine; a hanging mechanism for detachably hanging the optotype plate from the sliding portion in both of the second presentation states in which the back surface faces the subjective optometric apparatus.

In order to achieve the above object, the optometric apparatus of the present invention comprises a subjective optometric machine, a first visual target presentation device attached to the subjective optometric machine, and a subjective optometric machine installed in front of the subjective optometric machine. and a second visual target presenter. The first visual target presenting device includes a supporting rod, one end of which is held by the subjective optometry, extending parallel to the visual axis of the eye to be examined, and a slide slidably attached to the supporting rod. a first presentation state in which the front surface of the optotype plate faces the subjective optometric apparatus; and the back surface of the optotype plate faces the subjective optometry. a suspension mechanism for detachably suspending the optotype plate from the sliding portion in both of the second presentation states facing the ophthalmoscope.

In the optotype presenting device and the optometry device configured in this way, it is not necessary to adjust the distance from the subjective optometric device to the optotype plate when the optotype plate is reversed or exchanged.

1 is a perspective view showing an external configuration of an optometric apparatus of Example 1. FIG. FIG. 4 is a side view showing a visual target presentation state by the near vision target display device of Example 1; (a) is an enlarged and partially cutaway side view of the essential parts of the near vision target display device of Example 1, and (b) is a view in which the first suspension part and the second suspension part are detached. It is an explanatory view showing a state. 1 is a perspective view showing a main part of a near vision target display device of Example 1. FIG. FIG. 4 is a plan view showing the surface of the optotype plate; FIG. 2 is a plan view showing a main part of the near vision target display device of Example 1; FIG. 3 is an enlarged view of a main part showing a modification of the near vision target display device of Example 1;

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the optotype presentation apparatus and optometry apparatus of this invention is demonstrated based on Example 1 shown on drawing.

(Example 1)
The configuration of the optometric apparatus 100 of the first embodiment will be described below with reference to FIGS. 1 to 6. FIG.

The eye examination apparatus 100 of the first embodiment is an eye examination apparatus of an open-eyes type that can perform a visual function test of an eye to be examined in a state in which both the left and right eyes of the subject are opened. It should be noted that the eye examination apparatus 100 of the first embodiment can shield one eye and perform an examination for each eye.

As shown in FIG. 1, the optometric apparatus 100 of the first embodiment includes an optometric table 1, a refractor head 2 (subjective optometric device), and a near vision target presentation device 3 (first target presentation device, target presentation device), a distance target presenter 4 (second target presenter), and a controller 5.

1, 2, etc. throughout this specification, the X-axis, Y-axis, and Z-axis are taken, and when viewed from the subject H (eye to be examined E), the horizontal direction is the X direction, and the vertical direction ( The vertical direction) is defined as the Y direction, and the direction orthogonal to the X and Y directions (the facing direction of the reflector head 2 and the distance target display device 4, the depth direction) is defined as the Z direction.

The optometry table 1 is a desk on which various devices such as a reflector head 2, a distance optotype presenter 4, and a controller 5 are placed. The eye examination table 1 is also used for the subject H to place his elbows and arms in order to maintain his posture during eye examination.

The reflector head 2 is an ophthalmologic device used to select a lens that fits the eye E to be examined. The refractor head 2 is provided with a plurality of test lenses 24. The test lenses 24 are selectively inserted in front of the subject's eye E, and a refraction test can be performed while exchanging the test lenses 24 as appropriate. . The refractor head 2, as shown in FIG. 1, includes a support mechanism 21 and a pair of optometric units 22L and 22R.

The support mechanism 21 includes a column 21a, a support arm 21b, and a support member 21c. The column 21a is provided on the top plate of the optometric table 1 so as to extend in the vertical direction (Y direction). As indicated by the arrows in FIG. 1, the strut 21a is extendable and retractable in the vertical direction (Y direction) and rotatable in the circumferential direction manually or by an appropriate driving member. The support arm 21b is provided so as to extend obliquely upward from the support 21a. The support member 21c is fixed to the tip of the support arm 21b.

The pair of optometric units 22L and 22R are an optometric optical system for the left eye and an optometric optical system for the right eye which are provided on the left and right so as to correspond to the left and right eyes E of the subject H to be examined. The pair of optometric units 22L and 22R are suspended from a support member 21c and are slidable in the left-right direction (X direction) by a known slide mechanism. As a result, the pair of optometric units 22L and 22R can move toward and away from each other. The pair of optometric units 22L and 22R are inserted/removed between the subject's eye E and the distance visual target presentation device 4 by rotating the support pillar 21a of the support mechanism 21 in the circumferential direction. The pair of optometric units 22L and 22R are provided with optometric windows 23L and 23R, respectively. A plurality of test lenses 24 for left and right eyes are arranged in the pair of eye test units 22L and 22R. A plurality of inspection lenses 24 are selectively arranged at positions facing the respective eye examination windows 23L and 23R and used for eye examination.

The near vision target presenting device 3 is a visual target presenting device that presents a near vision optometry target 334 a (see FIG. 4 etc.) at a near vision optometry distance in front of the eye E to be examined. installed. As shown in FIGS. 1 and 2, the near vision target display device 3 includes a support rod 31, a sliding portion 32, a target portion 33, and a suspension mechanism .

The support rod 31 is a rod member whose one end 31a is held by the support member 21c of the refractor head 2 via a hinge mechanism 31b. The hinge mechanism 31b has the function of making the support rod 31 tiltable and of restricting the rotation angle of the support rod 31. As shown in FIG. As shown in FIG. 2, the hinge mechanism 31b rotates downward when the support rod 31 rotates downward and extends parallel to the visual axis S of the eye E to be examined (in the Z direction). 31 rotation is regulated. Further, when the support rod 31 stands up perpendicularly to the visual axis S (in the Y direction), the hinge mechanism 31b restricts the further rotation of the support rod 31 rearward (toward the subject H). A scale 31c is provided on the side surface of the support rod 31. As shown in FIG. A scale 31c indicates the distance from the pair of optometric units 22L and 22R.

The sliding portion 32 is slidably attached to the support rod 31, and as shown in FIG. is. A scale window 32b is formed on the side surface of the sliding portion 32. As shown in FIG. The scale window 32b faces the side surface of the support rod 31 on which the scale 31c is provided, and exposes the scale 31c. A mark 32c is provided on the scale window 32b. The mark 32c is provided corresponding to the position where the target part 33 is hung.

As shown in FIG. 4, the optotype section 33 has an optotype plate 33a and a housing 33b. The target part 33 is suspended from the sliding part 32 in a state where the sliding part 32 is moved from the predetermined position α of the support rod 31 to the tip part 31d, as shown by the broken line in FIG. It has a size that interferes with the distance visual target presentation device 4 when the front and back are reversed. In other words, the target part 33 cannot be turned upside down while suspended from the sliding part 32 located between the predetermined position α of the support rod 31 and the tip part 31d.

The optotype plate 33a is a disc member having a plurality of (in this case, six) optotype writing regions 333a on each of a front surface 331a and a back surface 332a (see FIG. 5). It is rotatably supported by a housing 33b by a shaft portion 33d passing through the center. As shown in FIG. 5, each optotype writing region 333a is provided with a plurality of optotypes 334a for near vision optometry. The plurality of targets 334a are different for each target writing region 333a. Although FIG. 5 shows the front surface 331a of the optotype plate 33a, the back surface 332a is also provided with six optotype writing regions 333a on which a plurality of optotypes 334a are provided. In addition, the optotype 334a is not limited to the Landolt ring, Snellen optotype, E-chart, etc., but may be characters such as hiragana or katakana, pictures of animals or fingers, or the like. It may be a specific figure, a landscape painting, a landscape photograph, or the like for visual function optometry.

The housing 33b is a hollow casing that houses the optotype plate 33a. As shown in FIGS. 3 and 4, a mounting portion 33c is provided on the top of the housing 33b. The mounting portion 33c sandwiches the target holding portion 342b of the suspension mechanism 34, and a shaft 343b projecting from the target holding portion 342b is rotatably fitted. As a result, the housing 33b is suspended from the second suspension portion 34b of the suspension mechanism 34, and is swingable with respect to the second suspension portion 34b about the mounting portion 33c. At this time, the housing 33b is hung with the front surface 331a and the back surface 332a of the optotype plate 33a facing the longitudinal direction of the second hanging portion 34b.

Further, the housing 33b is formed with eye-target windows 331b on the side facing the front surface 331a of the target plate 33a and on the side facing the back surface 332a of the target plate 33a. The optotype window portion 331b is an opening formed at a position through which the optotype writing region 333a passes when the optotype plate 33a rotates about the shaft portion 33d, and has substantially the same shape as the optotype writing region 333a. is presenting. Therefore, the optotype window 331b exposes one of the six optotype writing regions 333a set on the optotype plate 33a. Further, a cutout portion 332b is formed in the lower portion of the housing 33b to expose a portion of the periphery of the optotype plate 33a.

The suspension mechanism 34 is a mechanism for detachably suspending the index part 33 with respect to the sliding part 32 . In addition, the suspension mechanism 34 has a first presentation state in which the front surface 331a of the optotype plate 33a faces the pair of optometry units 22L and 22R of the refractor head 2, and a back surface 332a of the optotype plate 33a facing the refractor head 2. In both of the second presentation states facing the pair of optometric units 22L and 22R, the optotype section 33 can be attached to the sliding section 32 .

As shown in FIGS. 3A, 3B, and 4, the suspension mechanism 34 of the first embodiment includes a first suspension portion 34a fixed to the bottom surface of the sliding portion 32, and a first suspension portion 34a. A second hanging portion 34b that is detachable from 34a is provided.

The first hanging portion 34a has a hollow rectangular parallelepiped shape with an upper surface 341a fixed to the sliding portion 32 and an open bottom surface 342a, and the longitudinal direction is parallel to the support rod 31 (Z direction). A first magnet J1 is attached inside the first hanging portion 34a.

The second hanging portion 34b is a rectangular parallelepiped block member, and a rectangular parallelepiped protrusion 341b is formed on the first surface to be removably inserted into the first hanging portion 34a. A target holding portion 342b is formed to protrude from two surfaces. The protrusion 341b can be inserted into the first hanging portion 34a when its longitudinal direction is oriented parallel to the support rod 31 (the Z direction). A second magnet J2 that attracts the first magnet J1 is attached to the top surface of the protrusion 341b. The second suspending portion 34b is suspended from the first suspending portion 34a by the force of mutual attraction between the first magnet J1 and the second magnet J2. A pair of shafts 343b projecting in a direction (X direction) perpendicular to the longitudinal direction of the projecting portion 341b is formed on the target holding portion 342b. A mounting portion 33c formed on the top portion of the housing 33b of the target portion 33 is swingably mounted on the shaft 343b.

Furthermore, a cylindrical shaft portion 343a is provided on the upper surface 341a of the first hanging portion 34a. The shaft portion 343a is inserted into a concave portion 32d formed in the bottom surface of the sliding portion 32, and held via a bearing B so as to be rotatable in the circumferential direction. As a result, as shown in FIG. 6, the suspension mechanism 34 can rotate the target part 33 in the circumferential direction (around the vertical axis) of the shaft part 343a while the target part 33 is suspended. . As a result, when the sliding portion 32 is positioned between one end portion 31a of the support rod 31 and the predetermined position α, the optotype plate 33a is suspended from the sliding portion 32 and positioned relative to the refractor head 2. It is possible to invert the front and back. Note that the bearing B is provided with a stopper mechanism (not shown). The rotation of the second hanging portion 34b is restricted by the stopper mechanism in a state in which the front surface 331a or the back surface 332a of the optotype plate 33a faces the refractor head 2. As shown in FIG.

The distance visual target presenting device 4 is a visual target presenting device that presents a visual target for distance optometry (for example, a Landolt's ring, a Snellen visual target, or the like) at a distance optometry distance in front of the eye E to be examined. It is placed on table 1. The distance target presenting device 4 includes a rectangular parallelepiped housing 41 and a target presenting optical system 42 built in the housing 41 .

A window portion 41a is formed on the front surface of the housing 41 (on the side of the subject H) for the subject H to visually recognize the optotype.

The optotype presenting optical system 42, as shown in FIG. 2, includes a display 42a, a lens 42b, and a reflecting mirror 42c. In the optotype presenting optical system 42, the light beam from the optotype displayed on the display 42a is refracted by the lens 42b, and the optotype image (virtual image) I is formed at the distance vision optometry distance from the eye E to be examined. The luminous flux transmitted through the lens 42b is reflected by the reflecting mirror 42c, and an optotype image (virtual image) I is presented in front of the eye E to be examined at the far vision optometry distance.

The controller 5 is used by an examiner as an operator to operate the optometric apparatus 100 . The controller 5 receives an operation by the examiner and outputs an instruction signal corresponding to this operation to the reflector head 2 and the distance visual target display device 4 .

An example of the operation when near vision and distance vision are performed using the optometric apparatus 100 of the first embodiment will be described below with reference to FIG.

When performing near eye examination using the eye examination apparatus 100, the near eye target presentation device 3 attached to the refractor head 2 is used. That is, first, the examiner rotates the column 21a to place the pair of optometric units 22L and 22R between the subject's eye E and the distance visual target presentation device 4. As shown in FIG. A subject H faces a pair of optometric units 22L and 22R. This confrontation may be performed with the subject H standing or sitting on a chair or the like. In addition, the subject H puts the forehead against the forehead portion (not shown) provided between the pair of optometry units 22L and 22R and places the elbow and arm on the optometry table 1 to adjust the posture of the optometry. stabilize.

Next, as shown in FIG. 2, the examiner rotates the standing support rod 31 downward so that the support rod 31 is parallel (in the Z direction) to the visual axis S of the eye E to be examined. extend. Here, the index part 33 is suspended in advance from the sliding part 32 attached to the support rod 31 via the suspension mechanism 34 . The target part 33 is always pulled downward by its own weight. Therefore, the target portion 33 rotates around the shaft 343b in accordance with the rotation angle (upright state) of the support rod 31, and the vertical direction regardless of the rotation angle (upright state) of the support rod 31. drooping to That is, when the examiner extends the support rod 31 parallel to the visual axis S, the optotype plate 33a of the optotype unit 33 is inserted in front of the eye to be examined E and aligned with the visual axis S. face at a right angle.

Further, when the optotype section 33 is suspended so that the surface 331a of the optotype plate 33a faces the pair of optometry units 22L and 22R, the examiner will feel that the surface 331a of the optotype plate 33a faces the pair of optometry units 22L. , 22R.

After extending the support rod 31 in parallel with the visual axis S, the examiner moves the sliding portion 32 along the support rod 31 to move the optotype portion 33 (the optotype plate 33a) from the refractor head 2. (hereinafter referred to as "near vision optometry distance"). At this time, by confirming the correspondence relationship between the scale 31c exposed from the scale window 32b and the mark 32c provided on the side surface of the sliding portion 32, the examiner can grasp the near vision optometry distance. can. Therefore, the examiner can appropriately adjust the position of the sliding portion 32 .

Furthermore, in the optotype section 33, one of the six optotype writing areas 333a set on the optotype plate 33a is exposed through an optotype window 331b formed in the housing 33b. Therefore, the target 334a provided in the exposed target writing region 333a can be visually observed from the subject H, and the target 334a can be arranged at a desired near vision optometry distance.

Then, the sliding portion 32 is moved to adjust the near vision optometric distance, and when the optotype plate 33a is suspended at the desired near vision optometric distance, the examiner moves the optotype 334a between the pair of optometric units 22L. , 22R, and near vision optometry of the subject's eye E is performed. At this time, the examiner rotates a portion of the optotype plate 33a exposed from the housing 33b through the notch portion 332b, and rotates the optotype plate 33a around the shaft portion 33d to obtain the desired value from the optotype window portion 331b. can be made to appear in the optotype writing area 333a provided with the optotype 334a. Further, the examiner operates the controller 5 according to the visual appearance of the examinee H and appropriately selects a plurality of examination lenses 24, thereby correcting the adjustment state and oblique posture in the near use. be able to.

After performing eye examination in the first presentation state, in order to perform eye examination in the second presentation state in which the back surface 332a of the optotype plate 33a faces the pair of eye examination units 22L and 22R, first, the examiner moves the first magnet J1 and The target part 33 is pulled downward against the force of attraction between the second magnet J2 and, as shown in FIG. Remove.

After the second hanging portion 34b is removed from the first hanging portion 34a, the examiner turns the index portion 33 upside down. Then, the examiner inserts the projecting portion 341b of the second hanging portion 34b into the first hanging portion 34a, as shown in FIG. 3(a). Here, the first hanging portion 34a has a rectangular parallelepiped shape with an open bottom surface 342a. On the other hand, the projecting portion 341b of the second hanging portion 34b has a rectangular parallelepiped shape that is removably inserted into the first hanging portion 34a. Therefore, the projecting portion 341b can be inserted into the first hanging portion 34a even if the target portion 33 is turned upside down.

When the protrusion 341b of the second suspension portion 34b is inserted into the first suspension portion 34a, the first magnet J1 and the second magnet J2 attract each other, and the second suspension portion 34b moves back to the first suspension portion 34a. be hung. This allows the examiner to perform eye examination in the second presentation state.

At this time, since the sliding portion 32 to which the first hanging portion 34a is fixed does not need to be moved, the position of the sliding portion 32 relative to the support rod 31 does not change. Therefore, the sliding portion 32 does not deviate from the adjusted position when the eye is examined in the first presentation state, and there is no need to adjust the near vision eye examination distance when reversing the optotype plate 33a.

In addition, the shaft portion 343a provided on the upper surface 341a of the first hanging portion 34a is inserted into the concave portion 32d formed on the bottom surface of the sliding portion 32, and the first hanging portion 34a is held so as to be rotatable in the circumferential direction via the bearing B. It is Further, when the sliding portion 32 is positioned between the one end portion 31a of the support rod 31 and the predetermined position α, the visual target portion 33 can be turned upside down while being suspended from the sliding portion 32. There is no interference with the target display device 4. Therefore, when the sliding portion 32 is located between the one end portion 31a of the support rod 31 and the predetermined position α, the examiner attaches the first hanging portion 34a to the shaft portion 343a without removing the index portion 33. By rotating it in the circumferential direction (around the vertical axis), the optotype section 33 can be reversed. Also, even in this case, the examiner does not need to move the sliding portion 32 and does not need to adjust the near vision optometry distance.

When exchanging the optotype plate 33a, the examiner removes the optotype part 33 together with the second hanging part 34b from the first hanging part 34a and replaces it. Therefore, it is not necessary to move the sliding portion 32 to which the first hanging portion 34a is fixed, and it is not necessary to adjust the near vision optometry distance even when the optotype plate 33a is replaced. Further, since the examiner detaches and replaces the optotype part 33 without moving the sliding part 32, the optotype plate 33a can be easily replaced.

On the other hand, when performing distance optometry, the examiner uses the distance optotype display device 4 installed in front of the reflector head 2 . That is, first, the examiner rotates the support rod 31 extending in parallel (in the Z direction) to the visual axis S of the eye E to be examined upward, and vertically as indicated by the dashed line in FIG. Stand up. As a result, the target part 33 for presenting the near vision target is retracted from the front of the subject H. As shown in FIG. Then, after retracting the optotype unit 33, the examiner adjusts the angle of the reflecting mirror 42c so that the optical axis reflected by the reflecting mirror 42c (the output optical axis from the distance optotype presenter 4) and the eye to be examined Match the visual axis S of E.

Then, the examiner operates the controller 5 to display on the display 42a the target for distance optometry that matches the purpose of optometry. The luminous flux of the visual target is imaged by the lens 42b, and the visual target image I is presented at the distance eye examination distance as shown in FIG. The examiner causes the subject H to gaze at this visual target image I via the left and right optometric units 22L and 22R, and performs distance optometry of the eye E to be examined. In this case as well, the examiner operates the controller 5 according to the appearance of the examinee H and appropriately selects a plurality of examination lenses 24, thereby adjusting the adjustment state, oblique position, etc. during long distance use. Correction can be made.

The effects of the present invention will be described below.

As described above, in the near vision index presenting device 3 of the optometric apparatus 100 of the first embodiment, the hanging mechanism 34 can detachably hang the index portion 33 from the sliding portion 32 . The optotype section 33 has a first presentation state in which the front surface 331a of the optotype plate 33a faces the pair of optometric units 22L and 22R, and a second presentation state in which the back surface 332a of the optotype plate 33a faces the pair of optometric units 22L and 22R. It can be attached to the slide 32 in both presentation states. Therefore, the index part 33 can be detached from the sliding part 32 without moving the position of the sliding part 32 , and after being inverted, the index part 33 can be attached to the sliding part 32 again. As a result, when the optotype plate 33a is reversed or replaced, there is no need to adjust the distance from the refractor head 2 to the optotype plate 33a (near vision optometry distance). Therefore, the eye examination can be smoothly performed, and the eye examination can be performed efficiently and accurately.

Further, the target part 33 of the first embodiment is suspended from the sliding part 32 via the suspension mechanism 34 in a state where the sliding part 32 is moved from the predetermined position α of the support rod 31 to the distal end part 31d. When turned upside down while it is lowered, it has a size that interferes with the distance target display device 4 installed in front of the refractor head 2, as indicated by the dashed line in FIG.

Therefore, when the sliding portion 32 is located between the predetermined position α of the support rod 31 and the distal end portion 31d, the target portion 33 is removed from the sliding portion 32, inverted, and hung again. Become. In other words, there is no need to move the slide portion 32 or to prevent the optotype portion 33 from interfering with the distance optotype presenting device 4 .

Furthermore, in Example 1, the suspension mechanism 34 includes a first suspension portion 34a fixed to the sliding portion 32 and a second suspension portion 34a that holds the target portion 33 and is detachably attached to the first suspension portion 34a. 2 hanging portion 34b. Here, the first hanging portion 34a has a hollow rectangular parallelepiped shape with an open bottom surface 342a, and its longitudinal direction is parallel to the support rod 31 (Z direction). On the other hand, the second hanging portion 34b has a rectangular parallelepiped protrusion 341b formed on the first surface thereof to be inserted into the first hanging portion 34a, and a target holding portion 342b formed on the second surface. A pair of shafts 343b projecting in a direction (X direction) perpendicular to the longitudinal direction of the projecting portion 341b is formed on the target holding portion 342b.

Therefore, the direction in which the second hanging portion 34b is attached to the first hanging portion 34a is the direction in which the longitudinal direction of the protrusion 341b is parallel to the support rod 31 (the Z direction). The direction in which the index part 33 is held with respect to the second hanging part 34b is the direction in which the front surface 331a and the back surface 332a of the index plate 33a face the longitudinal direction of the second hanging part 34b. That is, the mounting direction of the second hanging portion 34b with respect to the first hanging portion 34a and the holding direction of the index portion 33 with respect to the second hanging portion 34b are defined in advance. This defines the orientation of the optotype plate 33a when attaching the second hanging portion 34b to the first hanging portion 34a. As a result, the optotype plate 33a does not turn sideways with respect to the refractor head 2, and the surface 331a or the back surface 332a of the optotype plate 33a can be easily made to face the eye E to be examined.

Further, in Example 1, the cylindrical shaft portion 343a formed on the upper surface 341a of the first hanging portion 34a is inserted into the concave portion 32d formed on the bottom surface of the sliding portion 32, It is held rotatably in the circumferential direction. Therefore, the suspension mechanism 34 can rotate around the vertical axis while the target part 33 is suspended. As a result, when the sliding portion 32 is positioned between one end portion 31a of the support rod 31 and the predetermined position α, the target portion 33 can be turned upside down while being suspended from the suspension mechanism 34. . In other words, the index part 33 can be easily turned over without removing it from the suspension mechanism 34 .

In the near vision target display device 3 of Example 1, the support rod 31 is tiltably attached to the refractor head 2 via a hinge mechanism 31b. On the other hand, the suspension mechanism 34 suspends the index part 33 in the vertical direction regardless of the rotation angle (upright state) of the support rod 31 . As a result, it is not necessary to adjust the inclination of the optotype section 33 when the support rod 31 is tilted, and the front surface 331a or the back surface 332a of the optotype plate 33a can be easily made to face the eye E to be examined. can. Also, when the support rod 31 is erected, the target portion 33 hangs down in the vertical direction as shown in FIG. Therefore, it is possible to prevent the target portion 33 from becoming an obstacle when the near vision target display device 3 is not used.

The near vision target presentation device 3 (eye target presentation device) and optometric device 100 of the present invention have been described above based on the first embodiment, but the specific configuration is not limited to this embodiment. Design changes, additions, etc. are permitted as long as they do not deviate from the gist of the invention according to each claim.

In the first embodiment, an example is shown in which the second hanging portion 34b is hung from the first hanging portion 34a by the force of attraction between the first magnet J1 and the second magnet J2, but the present invention is not limited to this. For example, as shown in FIG. 7, a stepped portion 35a directed toward the inner side of the opening is formed along the periphery of the opening formed in the bottom surface 342a of the first hanging portion 34a. On the other hand, a pair of claw portions 35b are formed on the second hanging portion 34b. The second hanging portion 34b may be hung from the first hanging portion 34a by inserting the pair of claw portions 35b into the openings and engaging the tips with the stepped portion 35a. When removing the second hanging portion 34b from the first hanging portion 34a, the second hanging portion 34b is pinched so that the pair of claw portions 35b approach each other, and the pair of claw portions 35b are pulled out from the opening.

In the first embodiment, when the optotype 334a for near vision optometry is retracted from the front of the eye to be examined E, the supporting rod 31 suspending the optotype 33 is rotated upward to stand up. is not limited to For example, while the support rod 31 is kept parallel to the visual axis S of the eye to be examined E, the second hanging portion 34b is removed from the first hanging portion 34a together with the target portion 33, thereby obtaining a vision for near vision. The target 334a may be retracted from the front of the eye E to be examined. Alternatively, while the support rod 31 is kept parallel to the visual axis S of the eye E to be examined, the support rod 31 may be rotated around the axis to direct the target portion 33 upward and retreat from the front of the eye E to be examined. good.

Further, in the first embodiment, the suspension mechanism 34 includes a first suspension portion 34a fixed to the sliding portion 32 and a second suspension portion 34b detachably attached to the first suspension portion 34a. Although an example of having the same is shown, the present invention is not limited to this. It suffices if the target part 33 can be attached to and detached from the sliding part 32 irrespective of the front and back, and the front and back of the target part 33 can be reversed without moving the sliding part 32 . Therefore, a magnet may be provided in the suspension mechanism 34 that suspends the target part 33, and the sliding part 32 may be formed of a magnetic material having magnetism. Alternatively, the hanging mechanism 34 may be formed of a magnetic material having magnetism, and a magnet may be provided in the sliding portion 32 . Furthermore, the suspension mechanism 34 may be configured by a hook provided on the sliding portion 32 and a through hole formed in the optotype plate 33a.

In the first embodiment, the examiner manually rotates the optotype plate 33a to make different optotypes 334a appear, but the present invention is not limited to this. A motor may be built in the housing 33b, and the optotype plate 33a may be rotated by using the motor according to a control command from the controller 5. FIG.

100 Optometry device 2 Refractor head (subjective optometry)
3 Near vision target display device (first target display device, target display device)
31 support rod 31a one end 32 sliding part 33 optotype 33a optotype plate 331a front surface 332a back surface 333a optotype writing region 334a optotype 33b housing 331b optotype window 34 suspension mechanism 34a first suspension portion 34b 2 hanging part J1 1st magnet J2 2nd magnet 4 Distance target display device (second target display device)
41 housing H subject E subject eye S visual axis

Claims (6)

a support rod whose one end is held by a subjective optometric machine and extends parallel to the visual axis of the eye to be examined;
a sliding portion slidably attached to the support rod;
an optotype plate having optotypes on its front and back surfaces;
In both the first presentation state in which the front surface of the optotype plate faces the subjective optometric device and the second presentation state in which the back surface of the optotype plate faces the subjective optometric device, a suspension mechanism for detachably suspending the optotype plate;
A visual target presentation device comprising: In the visual target presentation device according to claim 1,
The optotype plate is turned upside down while suspended from the sliding portion via the suspension mechanism in a state in which the sliding portion has moved from a predetermined position to the distal end of the support rod. a visual target presenting device having a size that interferes with a second visual target presenting device installed in front of the subjective optometry device when the second visual target presenting device is installed. In the visual target presentation device according to claim 1 or claim 2,
The suspension mechanism includes a first suspension part fixed to the sliding part, and a second suspension part that holds the optotype plate and is detachably attached to the first suspension part. ,
An optotype presentation device, wherein a mounting direction of the second suspending portion with respect to the first suspending portion and a holding direction of the optotype plate with respect to the second suspending portion are defined in advance. . In the visual target presentation device according to any one of claims 1 to 3,
The optotype presentation device, wherein the suspension mechanism allows the optotype plate to rotate around a vertical axis while being suspended. In the visual target presentation device according to any one of claims 1 to 4,
The support rod is tiltably attached to the subjective optometric machine,
The optotype presentation device, wherein the suspending mechanism vertically suspends the optotype plate regardless of the upright state of the support bar. a subjective optometry,
a first optotype presenter attached to the subjective optometric machine;
and a second visual target presentation device installed in front of the subjective optometric device,
The first visual target presenting device includes a support rod whose one end is held by the subjective optometric device and extends parallel to the visual axis of the subject's eye;
a sliding portion slidably attached to the support rod;
an optotype plate having optotypes on its front and back surfaces;
In both the first presentation state in which the front surface of the optotype plate faces the subjective optometric device and the second presentation state in which the back surface of the optotype plate faces the subjective optometric device, and a suspension mechanism for detachably suspending the optotype plate.

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