JP3935838B2 - Optometry equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optometry apparatus that subjectively examines the refractive power of an eye to be examined, and more particularly to an optometry apparatus that is suitable for a near vision test using a near vision target.
[0002]
[Prior art]
A subjective optometry apparatus having a pair of left and right lens chamber units each having an optometry window is known. When a near vision examination is performed using this optometry apparatus, a near chart provided so as to be movable in the axial direction of a near vision bar extending forward from the optometry apparatus main body is used (see Patent Document 1).
[Patent Document 1]
JP-A-10-272099
[0003]
[Problems to be solved by the invention]
By the way, there is an “adjustment test” as one of the near-field tests. In this test, one eye is shielded until the subject can read correctly, and the smallest character target is moved closer to the subject's eye, the position where the target appears to be blurred is measured, and the measurement position is set to the refractive power. It is an inspection method to convert. When such an examination is performed with the above-described conventional apparatus, the near-field chart is provided so as to be positioned at the center of the left and right eyes, so that the line of sight through the correction lens arranged in the optometry window deviates from the lens optical center. As a result, astigmatism and the prism effect occur, and accurate test results cannot be obtained.
One way to avoid this problem is to adjust the convergence angle of the left and right lens chamber units depending on the distance between the pupils and the position of the near-field chart. Since the cover of the room unit is not in contact with each other, the near distance where the lens center coincides with the line of sight of the eye to be examined is not so short. In the accommodation test, the near-field chart may be brought close to about 10 cm from the eye to be examined, so this correspondence is not sufficient.
In recent years, near-field examinations have come to be regarded as important, and there is an examination using a special optotype for examining binocular vision function (for example, an optotype for inspecting near-inequal vision). . When this special target is used, there is a problem that replacement with a normal near-field chart is necessary, and that the attachment / detachment is troublesome.
[0004]
In view of the above-described problems of the conventional apparatus, it is an object of the present invention to provide an optometry apparatus that can perform an accurate inspection and can easily perform an inspection using different near-field charts.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is characterized by having the following configuration.
(1) An optometry apparatus main body having a pair of left and right lens chamber units in which optometry windows are respectively arranged, and for inspecting the refractive power of the eye to be examined subjectively; An optometry apparatus comprising a near vision target presenting unit movably provided in the axial direction of the near vision rod, and holding the near vision target presenting unit movably in the eye width direction of the subject. Means is provided.
(2) an optometry apparatus main body having a pair of left and right lens chamber units each having an optometry window disposed therein, and a near-use rod extending forward from the optometry apparatus main body; , and a near optotype presenting unit that is movable in the axial direction of the near for rods having a display for displaying the near visual target, subjects the display position of the near visual target to be displayed on the display Display position moving means for moving in the eye width direction of the subject according to the interpupillary distance .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an optometry apparatus according to the present invention.
[0007]
Reference numeral 1 denotes an optometry apparatus main body, and the optometry apparatus main body 1 is suspended and supported by an arm 4. The optometric apparatus main body 1 includes a pair of symmetrical lens chamber units 5 and a support unit 6 that supports the left and right lens chamber units 5 in a suspended manner. Inside the left and right lens chamber units 5, a lens disk and a polarizing plate in which a large number of optical elements such as spherical lenses and cylindrical lenses are arranged on the same circumference are rotatably provided. Optical elements are switched and arranged in the optometry windows 5a provided in each. Further, the optometry apparatus main body 1 includes a slide mechanism that adjusts the distance between the left and right lens chamber units 5 in order to change the distance between the examination windows 5 a according to the distance between the pupils of the subject, and the left and right lens chamber units 5. It has a convergence mechanism that adjusts the convergence angle. The slide mechanism and the congestion mechanism are well known (see, for example, Japanese Patent Laid-Open No. 10-14872), and since the relationship with the present invention is thin, the description thereof is omitted.
[0008]
Reference numeral 2 denotes a near rod, which is attached by an attachment member 8 so as to extend to the front side of the support unit 6. The rod 2 is provided at a position corresponding to the middle between the left and right lens units 5. 3 is a near vision target presenting unit. In this embodiment, a near chart plate 3a on which a plurality of near vision targets are drawn is housed in a case 30 so as to be rotatable around a pin 32. A necessary near vision target is presented from the window 31 (see FIG. 2). The near vision target presenting unit 3 may simply be an optotype plate on which the near vision target is drawn.
[0009]
The near vision target presenting unit 3 is held by the holder unit 50 so as to be movable on the rod 2 (movable in the axial direction of the rod 2). A scale indicating the presentation distance of the near-field target presentation unit 3 from the eye to be examined is attached to the rod 2. Note that the rod 2 can be flipped upward about the axis of the mounting member 8 and is retracted from the field of view of the eye to be examined during a distance examination.
[0010]
FIG. 2 is a diagram illustrating the configuration of the near vision target presenting unit 3 and the holder unit 50. A slider 51 is movable in the axial direction of the rod 2, and the rod 2 is inserted into the guide hole 51a. Reference numeral 52 denotes an intermediate holder, which can rotate 360 degrees around a vertical axis V1 of a shaft 55 fixed below the slider 51. Reference numeral 53 denotes a support base that holds the near vision target presenting unit 3, and the support base 53 can rotate 180 degrees around the horizontal axis H <b> 1 of the intermediate holder 52. Reference numeral 56 denotes a lock screw that passes through a screw hole provided at the top of the slider 51 and fixes the movement of the slider 51 relative to the rod 2. By loosening the tightening force of the lock screw 56, the holder portion 50 can be smoothly moved with respect to the rod 2.
[0011]
FIG. 3 is a schematic view of the AA cross section of FIG. A cross-section T-shaped portion 30 a is formed on the upper part of the case 30 constituting the near vision target presenting unit 3. On the other hand, a guide groove for receiving the T-shaped section 30a is formed below the support base 53, and the near vision target presenting unit 3 is suspended and held by the support base 53 and formed on the support base 53. It is held so as to be movable in the left-right direction which is the eye width direction of the subject along the guide groove. At least the distance between the pupils of the subject is ensured as the moving distance in the left-right direction of the near vision target presenting unit 3. In the present embodiment, the lateral length of the cross-section T-shaped portion 30a is secured so as to allow a movement of 80 mm in the left-right direction. Further, the near vision target presenting unit 3 can be detached from the support base 53 by sliding to one side, and the near vision target presenting unit 3 is detachable from the support base 53. For this reason, different near vision targets can be easily exchanged.
[0012]
FIG. 4 is a diagram illustrating a state in which the near vision target presenting unit 3 is detached from the holder unit 50. A center mark 35 indicating the center position in the horizontal direction is drawn on the front and back surfaces of the T-shaped section 30a formed in the upper part of the case 30, and a scale 36 with a distance is drawn on both sides thereof. ing. On the other hand, a scale window 59 is formed on the front and back surfaces of the support base 53 on the holder portion 50 side, and a mark 57 indicating the center is attached to the upper part of the scale window 59. When the near-sight target presenting unit 3 is moved in the left-right direction, the near-field chart board 3a is moved in the left-right direction by observing the center mark 35 and the scale 36 displayed through the mark 57 and the scale window 59. The position can be confirmed. In the present embodiment, the distance display attached to the scale 36 is set to be twice the distance from the center position so that the distance attached to the scale 36 can directly correspond to the distance between the pupils of the subject.
[0013]
Further, a leaf spring 58 having a convex portion is formed on the support base 53 (see FIG. 2), and the convex portion of the leaf spring 58 has a T-shaped cross section when the near visual target presenting unit 3 reaches the center position. The examiner feels a click feeling by engaging with the hole 38 formed on the surface of the portion 30a. For this reason, the near vision target presenting unit 3 can be easily returned to the center position.
[0014]
A case will be described in which an adjustment force test is performed in the apparatus having the above-described configuration. The left and right lens chamber units 5 remain in a state parallel to the eye width direction without being congested, as in the distance examination. When performing a monocular accommodation test for the right eye, as shown in FIG. 1, the near-eye target presenting unit 3 is covered while viewing the scale 36 displayed on the scale window 59 according to the distance between the pupils of the subject. Slide to the right as seen by the examiner. Thereby, the line of sight through the correction lens disposed in the optometry window 5a is directed to the near vision target without deviating from the lens optical center. In the right eye examination, a shielding plate is disposed in the optometry window 5a on the left eye side.
[0015]
The examiner slides the holder part 50 with respect to the rod 2 and slowly brings the near vision target presenting unit 3 close to the eye to be examined from around 50 cm in front of the eye. The subject is made to see the target drawn on the near-field chart board 3a, and when the subject is aware of the blur of the target, the movement of the near-target target presenting unit 3 is stopped. The presenting distance of the near vision target presenting unit 3 at this time is read from the scale attached to the rod 2. Based on this, the adjustment force is calculated. Even when the near vision target presenting unit 3 is brought closer, the line of sight of the eye to be examined does not deviate from the optical center of the correction lens, so that an accurate examination can be performed.
Similarly, when examining the left eye, the near presentation unit 3 may be slid leftward as viewed from the subject while viewing the scale 36 displayed on the scale window 59.
[0016]
FIG. 5 is a diagram showing another embodiment in which the near vision target presenting unit 3 is held movably in the left-right direction. In FIG. 5, a rail 20 extending in the left-right direction is attached to the front side of the support unit 6, and the attachment member 8 of the rod 2 is held by the rail 20 so as to be movable in the left-right direction. Further, a scale 21 indicating the movement distance of the rod 2 and a mark 22 indicating the center are attached to the surface of the support unit 6. Then, by moving the rod 2 in the left-right direction in accordance with the interpupillary distance, the near-field target presenting unit 3 can be moved in the left-right direction together with the rod 2, and in the same manner as described above, the near-eye target unit 3 Presenting a visual target enables a monocular adjustment test.
[0017]
In the case of a visual target presenting device that presents a near visual target using a display such as a liquid crystal display, use a visual target presenting device having a size that allows the display position of the visual target to move at least the distance between the pupils. Thus, the presentation position of the near vision target can be moved onto the line of sight of the eye to be examined without moving the presentation device itself from side to side. In this case as well, the optotype presenting apparatus is held by holding means so that it can move on the rod 2.
[0018]
FIG. 6 is an external perspective view showing a configuration in which the second near-sight target presenting unit is provided in the holder portion 50 of FIG. 1, and FIG. 7 is a cross-sectional view illustrating the mounting structure. 6 and 7, reference numeral 60 denotes a second near-field target presentation unit.
A mounting bracket 61 is fixed to the support base 53 by bolts 54a and nuts 54b. The mounting bracket 61 has a receiving surface 61 a extending at an angle of about 90 degrees on the rod 2 side with respect to the visual target presenting surface of the near visual target presenting unit 3 held by the support base 53. A convex portion 61b is further formed at the tip of the receiving surface 61a. The mounting bracket 61 is made of a material such as iron attracted by a magnet. On the other hand, a magnet 62 is fixed to the upper part of the target plate 63 of the second near-field target presentation unit 60. By attaching the magnet 62 to the receiving surface 61a of the mounting bracket 61, the second near-field target presenting unit 60 has a support base 53 in a positional relationship of about 90 degrees toward the rod 2 with respect to the near-field target presenting unit 3. Retained.
[0019]
Since the support base 53 is rotatable around the horizontal axis H1 of the intermediate holder 52, the second near-target presentation unit 60 is rotated together with the near-target presentation unit 3 in the direction of arrow B in FIG. The target surface of the second near-field target presenting unit 60 can be positioned on a surface orthogonal to the axis of the rod 2. Thereby, the visual target presented to the eye to be examined can be switched. Further, since the second near-field target presenting unit 60 is attached by the magnet 62, it can be easily attached to and detached from the support base 53, and can be attached by moving in the left-right direction.
[0020]
The visual target provided in the second near-field visual target presenting unit 60 is a special visual target for the binocular visual function test, for example, as shown in FIG. The target plate 63 of the second near-field target presenting unit 60 is formed with a target 65 for unequal image inspection and a target 68 for fixation disparity inspection. The visual target 65 has what is presented to the right eye and what is presented to the left eye, and is configured by attaching polarizing plates whose polarization axes are orthogonal to each other. The same applies to the target 68. In addition, about a target structure, since it is a well-known technique, it abbreviate | omits.
[0021]
When performing a binocular vision test using the second near vision target presenting unit 60, the second near vision is obtained by rotating the support base 53 about the horizontal axis H1 of the intermediate holder 52. The optotype presenting surface of the sign presenting unit 60 is positioned in front of the eye to be examined. In the case of unequal image inspection, the target 65 is moved and attached so that the center of the target 65 becomes the center of the holder 50. A predetermined polarizing plate is set in each of the left and right optometry windows 5a of the lens chamber unit 5 to inspect the appearance of unequal image viewing with the left and right eyes. In the case of performing an inspection using the visual target 68, the second near-field visual target presenting unit 60 may be attached while being shifted laterally with respect to the holder unit 50.
[0022]
【The invention's effect】
As described above, according to the present invention, the near-field chart can be moved in the left-right direction, so that a test such as a monocular accommodation power test can be performed more accurately. In addition, the near chart can be easily switched.
[Brief description of the drawings]
FIG. 1 is a schematic view of an optometry apparatus according to the present invention.
FIG. 2 is a diagram for explaining a configuration of a near vision target presenting unit and a holder unit.
FIG. 3 is a schematic view of the AA cross section of FIG. 2;
FIG. 4 is a diagram illustrating a state in which a near vision target presenting unit is removed from a holder portion.
FIG. 5 is a diagram showing another embodiment for holding a near-sight target presenting unit so as to be movable in the left-right direction.
FIG. 6 is an external perspective view showing a configuration in which a second near-field target presenting unit is provided in the holder portion.
FIG. 7 is a cross-sectional view illustrating a structure for attaching a second near-field target presenting unit to a holder portion.
FIG. 8 is a diagram illustrating an example of a special visual target provided in a second near-field visual target presenting unit.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optometry apparatus main body 2 Near rod 3 Near visual target presentation unit 3a Near chart board 5 Lens chamber unit 6 Support unit 8 Mounting member 20 Rail 21 Scale 22 Mark 35 indicating the center Center mark 36 Scale 30 Case 50 Holder part 51 Slider 52 Intermediate holder 53 Support base 56 Lock screw 57 Mark 59 Scale window 60 Second near-field target presentation unit 61 Mounting bracket 62 Magnet 63 Target plate

Claims (2)

  An optometry apparatus main body that has a pair of left and right lens chamber units each having an optometry window and that subjectively inspects the refractive power of the eye to be examined; a near rod extending forward from the optometry apparatus body; In a optometry apparatus comprising a near-sight target presentation unit movably provided in the axial direction of the bar, a holding means for holding the near-sight target presentation unit movably in the eye width direction of the subject is provided. An optometry apparatus characterized by that. An optometry apparatus main body that has a pair of left and right lens chamber units each provided with an optometry window and that subjectively examines the refractive power of the eye to be examined; a near vision rod that extends forward from the optometry apparatus body ; A near-eye target presenting unit having a display for displaying a target and being movable in the axial direction of the near-field rod, and the display position of the near-target target displayed on the display between the pupils of the subject An optometry apparatus comprising: display position moving means for moving in the eye width direction of the subject according to the distance .

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