Perspective inspection instrument

Abstract

To provide a perspective inspection instrument 1 that is capable of accurately measuring a fusion maintenance capacity and that enables reduction in size and weight.SOLUTION: The perspective inspection instrument 1 includes a hand-held body 2. The body 2 includes: a window part 3 in which two light-transmitting members 8 and 9 are arranged to be overlapped; and a variable mechanism 11 that cooperates with the two light-transmitting members 8 and 9 to continuously vary the transmittance of light transmitted through the window part 3.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a perspective inspection instrument.

Background Art

[0002] Conventionally, a perspective inspection instrument having a handheld main body has been known (see, for example, Non-Patent Document 1). Non-Patent Document 1 discloses an inspection instrument used for inspecting the ability to maintain fusion (hereinafter referred to as "fusion maintenance ability"). The inspection instrument disclosed in Non-Patent Document 1 has a plurality of window portions formed in a vertical row on a plate-shaped main body, and filters having different light transmittance are arranged in each window portion. In the inspection using the inspection instrument of Non-Patent Document 1, the window portion is aligned with one eye of a patient with intermittent exotropia, and the window portion aligned with one eye is changed in the order of decreasing transmittance, and the fusion maintenance ability is measured based on the transmittance of the filter when exotropia appears.

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional configuration, since the transmittance of the filter changes stepwise for each window portion, the change in the transmittance of the window portion is not continuous. Therefore, a discontinuous change occurs in the brightness of the light seen by the subject. For this reason, with the conventional configuration, it is difficult for the examiner to distinguish whether the parallax is caused by the discontinuous change in brightness or whether the transmittance of the filter for one eye is at a transmittance level at which parallax appears, and there is a problem that the binocular fusion maintenance ability cannot be accurately measured. In addition, in order to secure the area of a plurality of window portions, there is a problem that the size of the main body increases and the weight increases. Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to provide a parallax inspection device capable of accurately measuring the binocular fusion maintenance ability and achieving miniaturization and weight reduction.

Means for Solving the Problems

[0005] In order to achieve the above object, the present invention provides a handheld main body, the main body including a window portion in which two light transmissive members are stacked, and a variable mechanism that cooperates the two light transmissive members to continuously vary the transmittance of light passing through the window portion, and is a parallax inspection device.

Effects of the Invention

[0006] According to the present invention, the binocular fusion maintenance ability can be accurately measured, and miniaturization and weight reduction can be achieved.

Brief Description of the Drawings

[0007]

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Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings. [First Embodiment] FIGS. 1, 2, and 3 are views showing a stereoscopic inspection instrument 1 according to the first embodiment. FIG. 1 is a perspective view of the stereoscopic inspection instrument 1, FIG. 2 is an exploded perspective view of the stereoscopic inspection instrument 1, and FIG. 3 is a plan view of the stereoscopic inspection instrument 1.

[0009] The stereoscopic inspection instrument 1 is an instrument for measuring the ability to maintain fusion. The stereoscopic inspection instrument 1 includes a handheld body 2. The body 2 includes a window portion 3 and a grip portion 4. The body 2 is composed of a pair of cases 5 and 6. Inside the window portions 3 of the pair of cases 5 and 6, a red filter 7, a pair of light transmission members 8 and 9 are arranged in an overlapping manner with their respective one surfaces facing each other. The red filter 7 and the pair of light transmission members 8 and 9 are supported by the pair of cases 5 and 6 by being accommodated in an overlapping manner in the pair of cases 5 and 6. The window portion 3 is a portion through which the line of sight of the subject to be inspected by the stereoscopic inspection instrument 1 passes and has a circular shape. Inside the grip portion 4 of the pair of cases 5 and 6, an operation portion 10 for rotating the light transmission member 9 within the plane of the window portion 3 is accommodated.

[0010] The red filter 7 is a disk that transmits light with a long wavelength among visible light. The pair of light transmission members 8 and 9 are circular polarizing plates. The pair of light transmission members 8 and 9 have slits formed on one surface. The pair of light transmission members 8 and 9 change the transmittance of the light passing through the window portion 3 by changing the relative angle between the slit of the light transmission member 8 and the slit of the light transmission member 9.

[0011] As shown in Fig. 2, the perspective inspection instrument 1 is provided with a variable mechanism 11. The variable mechanism 11 is a mechanism that cooperates a pair of light transmission members 8 and 9 to continuously vary the transmittance of light passing through the window portion 3. The light transmission member 9 has an annular member 12 attached to its outer peripheral portion. An annular rack gear 13 is formed on the surface of the annular member 12. The variable mechanism 11 includes a pinion gear 14 that meshes with the rack gear 13. An operation portion 10 for applying a rotational force to the pinion gear 14 is attached to the rotation axis 15 of the pinion gear 14. The variable mechanism 11 is housed inside the pair of cases 5 and 6 in a state where the axial direction of the rotation axis 15 of the pinion gear 14 coincides with the axial direction of the axis 4A of the grip portion 4. More specifically, with the rotation axis 15 of the pinion gear 14 supported by the bearing 17 of the case 6, the variable mechanism 11 is housed inside the pair of cases 5 and 6. Note that the fact that the variable mechanism 11 continuously varies the light transmittance means that the light transmittance is gradually varied without the light transmittance changing abruptly or discretely.

[0012] The operation portion 10 is rotationally operated in the direction X orthogonal to the axis 4A of the grip portion 4. When the operation portion 10 rotates in the right direction in Fig. 3, the pinion gear 14 rotates clockwise in Fig. 2, and with the rotation of this pinion gear 14, the light transmission member 9 rotates in the direction of arrow X1. When the operation portion 10 rotates in the left direction in Fig. 3, the pinion gear 14 rotates counterclockwise in Fig. 2, and with the rotation of this pinion gear 14, in the opposite direction, that is, the light transmission member 9 rotates in the direction of arrow X2. Note that the light transmission member 8 is fixed to the window portion 3 so as not to rotate with the rotation of the light transmission member 9.

[0013] Figure 4 is an enlarged view of Figure 3. As shown in Figure 4, an arrow 18 is attached to the annular member 12, and a display portion 19 indicating the degree of the fusion maintenance ability is provided in the window portion 3 on the case 6 side. The display portion 19 has a scale S indicating the degree of the fusion maintenance ability. The scale S is attached annularly in the window portion 3. The scale S is attached in a finely divided manner. When the light transmission member 9 rotates, the arrow 18 rotates integrally, and the arrow 18 indicates the scale S corresponding to the rotation angle of the light transmission member 9. In the present embodiment, when the arrow 18 indicates the scale S, the pair of light transmission members 8 and 9 are in a state where the transmittance of the light passing through the window portion 3 is the highest. That is, when the arrow 18 indicates the scale S, when viewed from the window portion 3, the relative angle between the slit of the light transmission member 8 and the slit of the light transmission member 9 is approximately 0°C. Therefore, as the annular member 12 rotates and the light transmission member 9 rotates, and the arrow 18 moves from the scale S1 toward the scale S2 or the scale S3, the transmittance of the light passing through the window portion 3 decreases.

[0014] When measuring the fusion maintenance ability, an examiner such as a doctor holds the grip portion 4 and applies the window portion 3 to either the left or right eye of the examinee suffering from intermittent exotropia. Then, the examiner measures the degree of the fusion maintenance ability with the strabismus examination instrument 1. The examiner rotates the operation portion 10 from the state where the arrow 18 indicates the scale S1 to decrease the transmittance of the light passing through the window portion 3, and stops the rotation of the operation portion 10 when strabismus occurs. At this time, the scale S indicated by the arrow 18 represents the degree of the fusion maintenance ability. The examiner can easily measure the degree of the fusion maintenance ability of the examinee only by checking the scale S indicated by the arrow 18.

[0015] As described above, the strabismus examination instrument 1 includes a handheld main body 2. The main body 2 includes a window portion 3 in which two light transmission members 8 and 9 are arranged in an overlapping manner, and a variable mechanism 11 that cooperates the two light transmission members 8 and 9 to continuously vary the transmittance of the light passing through the window portion 3.

[0016] According to this, since the transmittance of the light transmitted through the window portion 3 can be continuously varied, it is possible to suppress a sudden change in the brightness of the light seen by the subject. Therefore, the fusional vergence maintaining ability can be accurately measured. Further, since two light transmitting members 8 and 9 are arranged in the window portion 3, the number of window portions 3 can be reduced as compared with an instrument having a plurality of window portions. Thus, the stereoscopic inspection instrument 1 can accurately measure the fusional vergence maintaining ability and can be made smaller and lighter.

[0017] The variable mechanism 11 rotates the light transmitting member 9 within the plane of the window portion 3.

[0018] According to this, since the light transmitting member 9 is rotated within the plane of the window portion 3 to continuously vary the light transmittance, it is not necessary to provide a light transmitting member 9 having an area larger than that of the window portion 3, and it is not necessary to secure a range for rotating the light transmitting member 9 larger than the area of the window portion 3. Therefore, it is possible to make it smaller and lighter.

[0019] The variable mechanism 11 includes a rack gear 13 that rotates the light transmitting member 9, a pinion gear 14 that meshes with the rack gear 13, and an operation unit 10 that applies a rotational force to the pinion gear 14.

[0020] According to this, since the light transmittance can be changed by operating the operation unit 10, the fusional vergence maintaining ability can be measured more easily.

[0021] The main body 2 includes a grip portion 4 that supports the window portion 3. The operation unit 10 is disposed on the grip portion 4.

[0022] According to this, since the transmittance of the light transmitted through the window portion 3 can be changed by the hand holding the stereoscopic inspection instrument 1, the fusional vergence maintaining ability can be measured more easily.

[0023] The operation unit 10 is rotationally operated in a direction orthogonal to the axis 4A of the grip portion 4.

[0024] According to this, since the fingers of the hand holding the grip portion 4 can be moved along the direction in which the line of sight of the subject is desired to be moved, the binocular fusion maintenance ability can be measured more easily.

[0025] In the window portion 3, two red filters 7 are arranged overlapping two light transmission members 8 and 9.

[0026] When diplopia occurs, double vision occurs, and the subject appears to see the color of the visual target divided into red and non - red colors. Therefore, the subject can easily report to the examiner the timing when diplopia occurs, and the examiner can accurately grasp the timing when diplopia occurs. Thus, the diplopia inspection device 20 can increase the possibility of more accurately measuring the binocular fusion maintenance ability by having the red filter 7.

[0027] In the above - described first embodiment, the operation unit 10 is provided in the grip portion 4. However, the operation unit 10 may not be provided in the grip portion 4. The operation unit 10 may be provided, for example, near the connection between the window portion 3 and the grip portion 4.

[0028] In the above - described first embodiment, the light transmission member 9 is configured to be manually rotated relative to the other. In other embodiments, the light transmission member 9 may be rotated electrically. In this case, the diplopia inspection device 1 has a battery, a control device having a processor such as a CPU (Central Processing Unit), a motor for rotating the pinion gear 14, a button for designating the rotation direction of the motor, wiring, etc., and these may be attached to the main body 21. Then, in the diplopia inspection device 1 of this other embodiment, the control device rotates the motor according to the button operated by the examiner, and rotates the light transmission member 9 electrically.

[0029] In the above - described first embodiment, the light transmission member 9 is configured to be rotated. However, the light transmission member 8 may be rotated by the same method as the light transmission member 9.

[0030] In the above-described first embodiment, the light-transmitting member 9 is configured to rotate. However, a configuration in which both the light-transmitting members 8 and 9 rotate in different directions from each other may also be used.

[0031] In the above-described first embodiment, the red filter 7, the light-transmitting member 8, and the light-transmitting member 9 are arranged in this order from the case 5 toward the case 6. However, the arrangement order of the red filter 7, the light-transmitting member 8, and the light-transmitting member 9 is not limited to this, and any order may be used.

[0032] In the above-described first embodiment, the red filter 7 is arranged inside the window portion 3. However, the red filter 7 may be arranged outside the window portion 3. In this case, the red filter 7 may be detachably arranged outside the window portion 3 by a magnet or the like.

[0033] In the above-described first embodiment, the perspective inspection instrument 1 is configured to include the red filter 7. However, the perspective inspection instrument 1 may not include the red filter 7. Further, the perspective inspection instrument 1 may include a color filter other than transparent, such as a green filter or a blue filter, instead of the red filter 7. Further, the perspective inspection instrument 1 may include an ND filter instead of the red filter 7.

[0034] The above-described first embodiment merely shows one aspect of the present invention, and arbitrary modifications and applications are possible within the scope of the present invention.

[0035] [Second Embodiment] Next, a second embodiment will be described. FIG. 5 is a perspective view of the perspective inspection instrument 20. FIG. 6 is a plan view thereof. FIGS. 7 and 8 are end views thereof. FIG. 9 is a perspective view of the perspective inspection instrument 20 with the portable main body 21 removed. FIG. 10 is an enlarged view of FIG. 9.

[0036] The strabismus examination instrument 20 is, like the strabismus examination instrument 1, an instrument for measuring the ability to maintain fusion. The strabismus examination instrument 20 includes a main body 21 having a hollow box shape. The main body 21 includes a window frame 25 that holds a pair of light-transmitting members 23 and 24, and this window frame 25 has a pair of window portions 22 on the surfaces facing each other vertically in FIG. 5.

[0037] The pair of light-transmitting members 23 and 24 are members having a wedge shape with the same gradient as each other and are presented in red. On both ends in the short direction of the pair of light-transmitting members 23 and 24, convex pieces 26 extending in the longitudinal direction are formed. Then, the pair of light-transmitting members 23 and 24 are inserted into the main body 21 so that the convex pieces 26 enter into concave grooves 27 extending in the longitudinal direction formed on the inner wall of the main body 21. The light-transmitting members 23 and 24 having a wedge shape are held by the window frame 25 so that their respective surfaces face each other and their respective opposing surfaces are parallel or substantially parallel.

[0038] The strabismus examination instrument 20 includes a variable mechanism 28. The variable mechanism 28 is a mechanism that linearly varies the transmittance of light passing through the window portion 22 by causing the pair of light-transmitting members 23 and 24 to cooperate. On each of the opposing surfaces of the pair of light-transmitting members 23 and 24, rack gears 29 extending in the longitudinal direction are formed at both ends in the short direction. The variable mechanism 28 includes two pinion gears 30 and 31 that mesh with the rack gear 29 formed at one end, and two pinion gears 32 and 33 that mesh with the rack gear 29 formed at the other end. The pinion gears 30 and 32 are gears that share a rotation shaft 34, and both ends of the rotation shaft 34 are supported by the groove 27. Also, the pinion gears 31 and 33 are gears that share a rotation shaft 35, and both ends of the rotation shaft 35 are supported by the groove 27.

[0039] In the strabismus inspection instrument 20, at least one of the two light transmission members 23 and 24 is moved longitudinally. When the light transmission member 23 is moved in the direction of arrow X3 in the longitudinal direction, the pinion gears 30, 31, 32, and 33 rotate counterclockwise in FIG. 9, and the light transmission member 24 slides in the direction of arrow X4 in the longitudinal direction. That is, when the light transmission member 23 is moved in the direction of arrow X3, the light transmission member 24 slides in the direction of arrow X4 in the direction in which the tip of the light transmission member 24 moves away from the main body 21. On the other hand, when the light transmission member 23 is moved in the direction of arrow X4 in the longitudinal direction, the pinion gears 30, 31, 32, and 33 rotate clockwise in FIG. 9, and the light transmission member 24 slides in the direction of arrow X3. The same applies to the light transmission member 24. When it is moved in the direction of arrow X3, the light transmission member 23 slides in the direction of arrow X4, and when it is moved in the direction of arrow X4, the light transmission member 23 slides in the direction of arrow X3. When the light transmission member 23 slides in the direction of arrow X3, the light transmission members 23 and 24 also slide within the plane of the window portion 22, the thickness of the light transmission members 23 and 24 increases inside the main body 2, and the transmittance of the light passing through the window portion 22 decreases. On the other hand, when the light transmission member 23 slides in the direction of arrow X4, the light transmission members 23 and 24 also slide within the plane of the window portion 22, the thickness of the light transmission members 23 and 24 decreases inside the main body 2, and the transmittance of the light passing through the window portion 22 increases.

[0040] When measuring the fusion maintenance ability, an examiner such as a doctor holds the main body 21 and applies the window portion 22 to either the left or right eye of the examinee suffering from intermittent exotropia. Then, the examiner measures the degree of fusion maintenance ability with the strabismus inspection instrument 20. The examiner reduces the transmittance of the light passing through the window portion 22 by moving at least one of the light transmission members 23 and 24, and stops the sliding of the light transmission members 23 and 24 when strabismus occurs. Thereby, the examiner can measure the degree of the fusion maintenance ability of the examinee.

[0041] As described above, the variable mechanism 28 slides the light transmission members 23 and 24 within the plane of the window portion 22.

[0042] According to this, since the light transmission members 23 and 24 can be slid within the plane of the window portion 3 to linearly vary the light transmittance, the light transmittance can be linearly varied with a single window portion 3, and size reduction and weight reduction can be achieved.

[0043] The main body 21 includes a window frame 25. The light transmission members 23 and 24 have a wedge shape with the same gradient as each other. The window frame 25 holds the light transmission members 23 and 24 facing each other.

[0044] According to this, the light transmittance in the window portion 22 can be made uniform, and the occurrence of a situation where the timing of the occurrence of a perspective view varies depending on the position of the eye applying the window portion 22 can be suppressed. Therefore, the fusional maintenance ability can be measured more accurately.

[0045] The light transmission members 23 and 24 have rack gears 29 on their opposing surfaces. The window frame 25 includes pinion gears 30, 31, 32, and 33 that mesh with the rack gears 29.

[0046] According to this, since the light transmittance can be changed by operating the light transmission members 23 and 24, the fusional maintenance ability can be measured more easily.

[0047] The light transmission members 23 and 24 are presented in red.

[0048] When a perspective view occurs, double vision occurs, and the subject appears to see the color of the object of vision divided into red and a color other than red. Therefore, the subject can easily report to the examiner the timing when the perspective view occurs, and the examiner can accurately grasp the timing when the perspective view occurs. Therefore, the perspective view inspection device 20 can increase the possibility of measuring the fusional maintenance ability more accurately because the light transmission members 23 and 24 are presented in red.

[0049] In the above-described second embodiment, the light transmission members 23 and 24 are presented in red, but a configuration in which the light transmission members 23 and 24 are presented in a color other than red as long as it is a color other than transparent may also be used.

[0050] In the above-described second embodiment, the light-transmitting members 23 and 24 are wedge-shaped members. However, as long as the light-transmitting members 23 and 24 are colored such that the color gradually becomes darker from one end to the other end in the longitudinal direction, the shapes of the light-transmitting members 23 and 24 do not have to be wedge-shaped.

[0051] Note that the above-described embodiments are for exemplifying the technology in the present invention. Therefore, various changes, replacements, additions, omissions, etc. can be made within the scope of the claims or the equivalent scope thereof.

Explanation of Reference Numerals

[0052] 1, 20 Perspective inspection instrument 2, 21 Main body 3, 22 Window portion 4 Grip portion 7 Red filter 8, 9, 23, 24 Light-transmitting member 10 Operation portion 11, 28 Variable mechanism 13, 29 Rack gear 14, 30 - 33 Pinion gear 25 Window frame

Claims

1. A perspective inspection instrument comprising a handheld main body, wherein the main body has a window portion where two light transmissive members are arranged in an overlapping manner, and a variable mechanism that causes the two light transmissive members to cooperate to continuously vary the transmittance of light passing through the window portion.

2. The variable mechanism rotates the light transmissive member within the plane of the window portion. The perspective inspection instrument according to Claim 1.

3. The variable mechanism includes a rack gear that rotates the light transmissive member, a pinion gear that meshes with the rack gear, and an operation portion that applies a rotational force to the pinion gear. The perspective inspection instrument according to Claim 2.

4. The main body includes a grip portion that supports the window portion, and the operation portion is disposed on the grip portion. The perspective inspection instrument according to Claim 3.

5. The operation portion is rotated in a direction perpendicular to the axis of the grip portion. The perspective inspection instrument according to Claim 4.

6. A color filter other than transparent is disposed on the window portion in an overlapping manner on the two light transmissive members. The perspective inspection instrument according to any one of Claims 1 to 5.

7. The variable mechanism slides the light transmissive member within the plane of the window portion. The perspective inspection instrument according to Claim 1.

8. The main body includes a window frame having the window portion, the light transmissive members have a wedge shape with the same gradient as each other, and the window frame holds the light transmissive members facing the window portion. The perspective inspection instrument according to Claim 7.

9. The light transmission member has rack gears on opposing surfaces thereof, and the window frame includes a pinion gear that meshes with the rack gear. The perspective inspection instrument according to claim 8.

10. The light transmission member is presented in a color other than transparent. The perspective inspection instrument according to any one of claims 7 to 9.

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