JP2001000392A - Near visual function examination target plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily make a plurality of near visual function examinations. SOLUTION: This target plate 1 is a plate that can be fitted to an optometer and disposed in a desired position with hands, and is provided with a plurality of following targets: (1) Near phoria examination Maddox's targets: the plate 1 is pierced with a light source hole 2, and a plate face is provided with graduations 3, 4 for the near phoria quantity with the light source hole 2 as a reference point. (2) Near aniseikonia examination targets: the plate face is provided with a pair of targets of symmetric shape and unequal dimensions, each target is covered with a polarizing film, and polarizing axes of both polarizing films are made orthogonal. (3) Near fixation disparity examination targets: the plate face is provided with a pair of targets, each target is covered with a polarizing film, polarizing axes of both polarizing films are made orthogonal, and graduations for near fixation disparity quantity are provided between both targets. (4) Child near binocular vision examination targets: the plate face is provided with two targets shaped to be easily understood by children, each target is covered with a polarizing film, and polarizing axes of both polarizing film are made orthogonal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optotype plate for inspecting and confirming the function of near vision.

[0002]

2. Description of the Related Art In a spectacle shop, a person who purchases eyeglasses measures an eyesight or a corrected eyesight using eyeglasses using an optometer, and selects a lens of the eyeglasses based on the measurement result. A plurality of the following near vision function tests are usually performed with the lens on.

[0003] 1) The near oblique examination, which measures the amount by which the lines of sight of both eyes are shifted without coming to the same point when viewed in the near direction, is a prism separation method. It is placed in front of the subject's eyes, and the optotype is placed near the front side.

[0004] The subject sees one optotype separated into two by the prism action of the rotary prism. The amount of the prism of the rotary prism is increased / decreased, and the optotypes which can be separated into two are superimposed to form one optotype. The near oblique amount is obtained from the prism amount of the rotary prism at that time.

[0005] 2) A near-amorphous image test for measuring the amount by which the images of the same size seen by the left eye and the right eye when viewed from the near side do not become the same size but deviate from each other is performed by using a red lens. The subject wears red-green glasses in which green lenses are fitted on the left and right, and a half-moon-shaped red target and a green target are placed facing each other in front of the subject.

The subject sequentially looks at the optotypes whose red and green optotypes are slightly different in size. If the red and green optotypes of different sizes appear to be of the same size, the near unequal image parallax is obtained from the difference in size between the red and green optotypes.

3) The near fixation disparity test, which measures the amount by which the position on the retina where fixation is performed during near vision does not become a fovea with high visual acuity but deviates from the fovea, is a polarizing lens whose polarization axes are orthogonal to each other. The subject wears polarized glasses with left and right fitted, and the left and right or top and bottom optotypes printed on the back of the left and right or top and bottom polarizing films whose polarization axes are orthogonal to each other are arranged near the front side of the subject. I do.

If the two targets appear shifted, the near fixation disparity amount is obtained from the displaced amount.

4) The near binocular vision test for children, which examines whether or not a child is looking near using both eyes, is a method in which a subject wears polarized glasses in which the polarization axes of left and right polarizing lenses are orthogonal to each other. The left and right optotypes printed on the back surfaces of the left and right polarizing films whose polarization axes are orthogonal to each other are placed near to the front side thereof.

If both targets can be seen, both eyes are used. If only one target is visible, one eye is not being used while the other is being used.

[0011]

However, in a spectacle shop, a plurality of the above-described near vision function tests are often performed successively on the same subject. It is a device.

[0012] It takes a lot of trouble to sequentially set and use individual test instruments. Also, individual test instruments are expensive to purchase and require a large space for storage.

Further, each test instrument or test has disadvantages.

1) The prism separation method of the near oblique examination uses a rotary prism mechanism and an optotype of an optometer for measuring visual acuity.

The prism separation method requires a lot of trouble,
The subject is apt to be tired due to the strain on the eye muscles.

2) The near-unequal-vision visual examination uses red-green glasses and a target in which a red target and a green target are opposed to each other.

The optotype requires a large number of pairs in which the sizes of the red and green optotypes are slightly different from each other, and are expensive because accurate printing is required for production.

In the test, since the size of the red and green targets is slightly different from each other, the test takes a lot of time and effort. Although the inspection accuracy is high, the eyeglass shop only needs to be able to determine whether or not the correction by eyeglasses is necessary.

3) The near fixation disparity test uses polarized glasses and an optotype attached to the front of a box containing a lighting device.

The target is not attached to the optometer, and
It is difficult to place it in a desired position by holding it by hand. Arranging the optotype in front of the box at a desired position requires a lot of trouble. The polarizing film with the optotype printed on the back surface exposes the front surface and has low durability.

4) The near binocular vision test for children uses polarized glasses and a target mounted on a frame.

The target is not attached to the optometer. The polarizing film with the optotype printed on the back surface exposes the front surface and has low durability.

[0023]

[Effects to Solve the Problems] For the above-described near vision function tests, it can be attached to an eye tester for eyesight measurement provided at an eyeglass store, and can be held at a desired position by hand. Na1
I came up with the use of two optotype plates. Instead of using special red-green spectacles, the inventor has conceived to use polarizing glasses or polarizing plates attached to an optometer or hand-held polarizing plates or polarizing glasses prepared at an eyeglass shop.

The optotype plate is provided with optotypes and scales for each inspection on one plate, and a polarizing plate having a polarizing film laminated on a transparent plate is adhered to the optotype portion of the plate, and the optotype is polarized. The polarizing film was coated with a transparent plate. The polarizing film covered with the transparent plate has high durability.

1) In the near oblique examination, the Maddox method, which is simple and does not impose a burden on the eye muscles, is used instead of the prism separation method.

The Maddox method is used for a remote oblique examination using an optometer. This was diverted to the near oblique examination.

2) In the near anisotropic visual inspection, polarized glasses are used instead of red-green glasses, and polarizing film-coated targets are used instead of the red-green targets.

In addition, a large number of optotypes were not used, and only optotypes having a dimensional difference, which is a borderline of necessity of correction by eyeglasses, were used.

3) In the near fixation disparity test, an optotype plate was used instead of the optotype mounted on the box.

4) In the near-binocular visual inspection for children, an optotype plate was used instead of the optotype attached to the frame.

[0031]

An optotype plate according to the present invention is a plate which can be attached to an eye tester for measuring visual acuity and which can be held at a desired position by hand. Of the optotypes, any two or three or all were provided.

1) Optotype of Maddox method for near oblique examination:
A light source hole was penetrated through the plate, and a scale of the near oblique amount was provided on the plate surface with the light source hole as a reference point.

2) Optotypes for near anisotropy inspection: a pair of symmetrical and unequal dimensions optotypes are provided on the plate surface, each of the optotypes is covered with a polarizing film, and the polarization axes of both polarizing films are provided. Were arranged in a direction perpendicular to the direction.

3) Optotypes for near fixation disparity test: A pair of optotypes are provided on the plate surface, each of the optotypes is covered with a polarizing film, and the polarizing axes of both polarizing films are arranged in a direction orthogonal to each other. A scale of near fixation disparity was provided with a reference point between both targets.

4) Optotypes for near binocular vision inspection for children: Two optotypes having a shape that is easy for children to understand are provided on the plate surface, and each optotype is covered with a polarizing film. The axes were arranged in orthogonal directions.

In the target plate of the present invention, the polarizing film is covered with a transparent plate.

[0037]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Configuration] A target plate for a near vision function test is a rectangular synthetic resin plate with rounded corners, a size of 110 × 190 × 1 mm, and a weight of about 30 g. .
It can be attached to an eye tester for measuring visual acuity, and can be placed at a desired position by hand.

1) The optotype of the Maddox method for the near oblique examination is provided on one surface of a horizontally long rectangular synthetic resin plate 1 as shown in FIG.

In the center of the synthetic resin plate 1, a small diameter light source hole 2 is penetrated. On the white surface of the synthetic resin plate 1, graduations 3 indicating the near horizontal oblique amount and the near vertical oblique amount with the light source hole 2 as a reference point are provided on both the left and right sides and the upper and lower sides of the light source hole 2 respectively. , 4 are printed in black.

2) The optotype for the near anisotropic visual inspection is provided in the left half of the light source hole 2 on the other side of the synthetic resin plate 1 as shown in FIG.

On a white surface of the synthetic resin plate 1, a square portion 5 is printed in black, and a cross mark 6
Are printed in white, and half-octagonal targets 7, 8 are printed in white on the left and right sides of the cross target 6, respectively.

A pair of semi-octagonal optotypes 7, 8 which are opposed to each other with the cross optotype 6 interposed therebetween are symmetrical with respect to the vertical line of the cross optotype 6, and their strings are perpendicular and parallel. The left half-octagonal target 7 is 3% smaller than the right half-octagonal target 8 and has unequal dimensions. If the amount of near unequal image viewing is within 3%, no correction with glasses is required.

On the left and right half-octagonal targets 7, 8, rectangular polarizing plates 9, 10 are adhered with a transparent adhesive, respectively. The polarizing plates 9 and 10 have transparent synthetic resin plates laminated on both surfaces of the polarizing film. The right and left hemi-octagonal targets 7 and 8 are covered with polarizing films of polarizing plates 9 and 10, respectively.

In the polarizing film of the polarizing plate 9 on the left side, the polarizing axis 11 is oriented at 135 degrees counterclockwise from the horizontal line. In the polarizing film of the polarizing plate 10 on the right side, the polarization axis 12 is also in the direction of 45 degrees. The polarizing films of the left and right polarizing plates 9 and 10 have a polarization axis of 1.
The directions of 1 and 12 are orthogonal.

In the lower position of the square black portion 5, the character "3% ANISEIKONIA TEST", which means 3% inequality inspection, is printed.

3) The optotype for the near fixation disparity test is provided on the right half of the light source hole 2 on the surface of the synthetic resin plate 1 on which the near anisotropy test optotype is provided. ing.

On the white surface of the synthetic resin plate 1, a square portion 13 is printed in black, and a vertically long rectangular portion 14 is printed in the center of the black portion 13 by white printing.
A cross target 15 is printed in black at the center of 4, and scales 16 representing the near fixation disparity with the cross target 15 as reference points are printed in black on both upper and lower sides of the cross target 15. are doing.

The black portions 13 on the left and right sides of the cross target 15 are respectively provided with isosceles triangular targets 17, 1
8 is printed in white. A pair of isosceles triangular optotypes 17 and 18 opposed to each other on the left and right across the cross optotype 15 have the same size, are symmetrical with respect to the vertical line of the cross optotype 15, and have their apex angles. Facing each other.

On the left and right isosceles triangular targets 17 and 18, square polarizing plates 19 and 20 are adhered with a transparent adhesive, respectively. The polarizing plates 19 and 20 have transparent synthetic resin plates laminated on both surfaces of the polarizing film. The right and left isosceles triangular targets 17 and 18 are respectively the polarizing plate 1
It is covered with 9, 20 polarizing films.

The polarizing film of the polarizing plate 19 on the left has a polarization axis of 135 degrees counterclockwise from the horizontal line. The polarization axis of the polarizing film of the polarizing plate 20 on the right side is also at 45 degrees. The polarizing films of the left and right polarizing plates 19 and 20 have orthogonal polarization axes.

The characters "VERTICAL" and "HORIZONTAL" are printed in white at the upper position and the left position of the scale 16 of the near fixation disparity amount. On the right side, "FIXATION DISPARITY" meaning fixation disparity is printed in white.

4) The target for the near binocular vision test for children is shown in FIG.
As shown in (1), it is provided below the near fixation disparity test optotype.

On the left and right sides of the lower part of the black portion 13, a star-shaped optotype 21 and a round-shaped optotype 22 are printed in white. The star shape and the round shape are easy for children to understand.

On the left and right star-shaped optotypes 21 and the round-shaped optotypes 22, square polarizing plates 23 and 24 are adhered with a transparent adhesive, respectively. The polarizing plates 23 and 24 have transparent synthetic resin plates laminated on both surfaces of the polarizing film. The left and right star-shaped targets 21 and the round targets 22 are covered with polarizing films of polarizing plates 23 and 24, respectively.

The polarizing film of the left polarizing plate 23 has a polarization axis of 135 degrees counterclockwise from the horizontal line. The polarizing film of the polarizing plate 24 on the right has a polarization axis of 45 degrees. The polarizing films of the left and right polarizing plates 23 and 24 have their polarization axes orthogonal to each other.

Characters “SUPPRESSION” meaning suppression are printed in white between the left and right polarizing plates 23 and 24.

[Usage Method or Inspection Method] 1) Maddox Method for Near Oblique Inspection When performing this inspection, as shown in FIG. The target plate 1 is interposed and suspended from a target mounting fixture 33 movably mounted on a target placement rod 32 protruding from the target plate 32. The target plate 1 is disposed in a horizontally long position in parallel with the spectacle unit 31.

The near oblique examination target of the target plate 1 is
It is arranged concentrically with 1 and at a near position where the distance from the eye E of the subject located on the rear side of the spectacle section 31 is 40 cm.

The opposite side of the optotype plate 1 from the spectacle plate 31 side is illuminated with a lighting fixture or penlight in the examination room. The subject can see the point light source emitted from the light source hole 2 of the optotype plate 1 through the spectacles 31.

1.1) In the case of inspecting a horizontal oblique position, a madox stick is set to the right position on the spectacle section 31 for the right eye. The subject can see the red vertical line appearing on the near oblique examination target of the optotype plate 1 by the madox stick in the horizontal position and the streak light by the madox stick through the right eye of the spectacle unit 31 with the right eye.

When the subject looks at the near oblique examination target of the optotype plate 1 with both eyes through the spectacle section 31, the red vertical line and streak light on the optotype overlap the point light source of the optotype. If you see
No near horizontal oblique.

As shown in FIG. 4, a red vertical line R indicates a point light source 2.
If it is seen to the left (Exo Range) of, it is the outer oblique (near horizontal). The amount of the outer oblique is obtained from the number on the scale 3 where the red vertical line R overlaps. On the contrary, the red vertical line R is a point light source 2
If it is seen to the right (Eso Range) of, it is an inner slope.

1.2) When inspecting the vertical oblique position, the right eye madox stick of the spectacle unit 31 is set to the vertical position. The subject examines the red horizontal line and streak light appearing on the near oblique examination target of the optotype plate 1 by the vertically positioned madox stick.
One can see through the right eye with the right eye.

When the subject looks at the near oblique examination target of the optotype plate 1 with both eyes through the spectacle section 31, if the red horizontal line is seen overlapping with the point light source, there is no near vertical oblique.

As shown in FIG. 5, a red horizontal line R indicates a point light source 2.
If you see the lower position (Right Hyper Range),
It is the upper right oblique. The amount of the obliqueness is obtained from the number on the scale 4 where the red vertical line R overlaps. Conversely, if the red vertical line R is seen at the upper position (Right HypoRange) of the point light source 2, it is a lower right oblique (upper left oblique).

2) Near-Anonymous Visual Inspection When performing this inspection, the near-infrared visual inspection optotype of the optotype plate 1 faces concentrically in parallel with the spectacle unit 31 of the optometer, and the spectacle unit The distance from the eye E of the subject located behind 31 is 30 to
Place it near 40cm.

2-1) When inspecting the unequal image in the vertical direction, the optotype plate 1 is arranged at a horizontally long position as shown in FIG.

The left and right eyes of the spectacle section 31 are respectively
Set the polarizing plate. In the polarizing plate 41 for the left eye, as shown in FIG. 7, the polarization axis 42 is at a direction of 135 degrees counterclockwise from the horizontal line. This is the same direction as the polarization axis 11 of the left polarizing plate 9 of the near-unequal-vision visual inspection target of the target plate 1. The polarization plate 43 of the right eye has a polarization axis 44 of 45 degrees counterclockwise from a horizontal line. Right side polarizing plate 10 for near atypical visual inspection target
In the same direction as the polarization axis 12.

When the subject looks at the near oblique examination optotype of the optotype plate 1 with both eyes through the spectacle section 31, the left eye sees a small half-octagonal optotype on the left side of the near oblique examination optotype. 7 and the large right octagonal optotype 8 on the right is not visible. The right eye sees the large right octagonal optotype 8 on the right side and does not see the small half octagonal optotype 7 on the left side.

If the large right octagonal optotype 8 on the right side looks larger or almost equal to the small left octagonal optotype 7 on the left side, it is a near near unequal image view within 3%. Does not require eyeglass correction.

If the small half-octagonal target 7 on the left side looks larger than the large half-octagonal target 8 on the right side, it looks larger than the right eye with the left eye and the near unequal image in the vertical direction exceeds 3%. is there.

Next, the polarizing plates 4 for the left and right eyes of the spectacle section 31
As shown in FIG. 8, the polarization axes 44 of the left-eye polarizing plate 43 are set at 45 degrees, and the right-eye polarizing plate 4 is changed.
One polarization axis 42 is oriented at 135 degrees.

When the subject looks at the near oblique examination optotype of the optotype plate 1 with both eyes through the spectacle section 31, the large right octagonal optotype 8 on the right side of the left eye is contrary to the above. The small half-octagonal target 7 on the left is not visible. The right eye sees the small half-octagonal optotype 7 on the left side and does not see the large half-octagonal optotype 8 on the right side.

If the small half-octagonal target 7 looks larger than the large half-octagonal target 8, the right eye looks larger than the left eye, and there is a near unequal vision in the vertical direction exceeding 3%.

2-2) When inspecting the unequal image vision in the horizontal direction, the optotype plate 1 is arranged at a vertically long position as shown in FIG. The optotype 7 and the large half-octagonal optotype 8 are arranged vertically.

As shown in FIG. 7, a polarizing plate 41 having a polarization axis 42 of 135 degrees and a polarizing plate 43 having a polarization axis 44 of 45 degrees are provided for the left eye and the right eye of the spectacle section 31, respectively. I do.

When the subject looks at the near oblique examination target of the optotype plate 1 with both eyes through the spectacle section 31, the left eye can see the large half-octagonal target 8 on the lower side and the small octagonal target 8 on the upper side. The half-octagonal target 7 cannot be seen. With the right eye, the upper small octagonal optotype 7 can be seen, and the lower large octagonal optotype 8 cannot be seen.

If the lower large half-octagonal target 8 looks larger or almost equal to the upper small half-octagonal target 7, it is a horizontal near inequality image within 3%. Does not require eyeglass correction.

If the upper small hemi-octagonal target 7 looks larger than the lower large half-octagonal target 8, the right eye looks larger than the left eye, and the horizontal near unequal image exceeds 3%. There is.

Next, the polarizing plates 4 for the left and right eyes of the spectacle section 31
8, the polarization axis 44 of the left-eye polarizing plate 43 is set to 45 degrees, and the polarization axis 42 of the right-eye polarizing plate 41 is set to 135 degrees, as shown in FIG.

When the subject looks at the near oblique test chart of the optotype plate 1 with both eyes through the spectacle section 31, the small half-octagonal chart 7 on the upper side is displayed on the left eye. The lower large half-octagonal optotype 8 cannot be seen. With the right eye, the lower large half-octagonal target 8 is visible, and the upper small half-octagonal target 7 is not visible.

If the upper small octagonal optotype 7 looks larger than the lower large octagonal optotype 8, the left eye looks larger than the right eye and more than 3% of horizontal near-distant image viewing. There is.

2-3) Each of the above-described near unequal image inspections is an inspection in frontal view. When performing an inspection in a downward or upward view, the optotype plate 1 is held at a desired position on the front upper side or the front lower side with the hand.

2-4) If the spectacle section 31 of the optometer is not provided with a mechanism for setting the polarizing plate as described above, use a polarizing plate or polarizing glasses that are held.

2-5) When performing a near-distant anisotropy test in the vertical direction, the vertical chords of the left and right half-octagonal targets 7 and 8 are set to the positions shown in FIG.
As shown at 0, if it looks slanted and non-parallel, there is a near convolutional oblique. Inspection of proximal rotation oblique can also be performed.

As shown in FIG. 11, if the vertical chord of the right half octagonal optotype 8 and the vertical straight line connecting the upper right and lower right corners of the chord appear inclined and non-parallel. The eyes looking at the half-octagonal target 8 have shape distortion due to astigmatism. The same applies to the left half-octagonal target 7. An inspection for shape distortion due to astigmatism can also be performed.

3) Near Fixation Disparity Inspection In performing this examination, the near fixation disparity test optotype of the optotype plate 1 faces concentrically in parallel with the spectacle unit 31 of the optometer. The distance from the eye E of the subject located on the rear side is 40 cm
Place it in a near position.

3-1) In the case of inspecting for fixation disparity in the vertical direction, as shown in FIG. 12, the optotype plate 1 is arranged at a horizontally long position.

The left and right eyes of the spectacle unit 31 are respectively
Set the polarizing plate. As shown in FIG. 7, the polarization plate 41 of the left eye has a polarization axis 42 of 135 degrees. This is the same direction as the polarization axis of the left fixation plate 19 of the near fixation disparity test test target of the test target plate 1. The polarizing plate 43 of the right eye has a polarization axis 44 of 4.
The direction is 5 degrees. This is the same direction as the polarization axis of the right polarizer 20 of the near fixation disparity test target.

When the subject looks at the near fixation disparity test optotype of the optotype plate 1 with both eyes through the spectacle section 31, the left eye sees a triangular optotype on the left side of the near fixation disparity test optotype. 17 is visible, and the right triangular target 18 is not visible. With the right eye, the right triangular optotype 18 is visible, and the left triangular optotype 17 is not visible.

As shown in FIG. 12, if the left and right triangular targets 17 and 18 can be seen at the left and right positions of the cross target 15 as the reference point, there is no near fixation disparity in the vertical direction.

As shown in FIG. 13, if the left triangular optotype 17 appears to be shifted upward or downward from the position of the cross optotype 15, the left eye has a near fixation disparity in the vertical direction. The amount of the fixation disparity is indicated by the scale 1 indicated by the left triangular target 17.
It is obtained from the number 6. Conversely, the right triangular target 18
If the right eye is displaced from the position of the cross optotype target 15, the right eye has a near fixation disparity in the vertical direction.

3-2) When inspecting for fixation disparity in the horizontal direction, the optotype plate 1 is disposed at a vertically long position as shown in FIG. 18 and 17 are arranged up and down.

As shown in FIG. 7, the left eye and the right eye of the spectacle unit 31 are provided with a polarizing plate 41 having a polarizing axis 42 of 135 degrees, and a polarizing plate 41, respectively. The axis 44 sets the polarizing plate 43 in the direction of 45 degrees.

When the subject views the near fixation disparity test optotype of the optotype plate 1 with both eyes through the spectacle section 31, the left eye detects the triangular optotype above the near fixation disparity test optotype. 18 can be seen, and the lower triangular target 17 cannot be seen. With the right eye, the lower triangular optotype 17 is visible, and the upper triangular optotype 18 is not visible.

As shown in FIG. 14, if the upper and lower triangular optotypes 18 and 17 can be seen above and below the cross optotype target 15, there is no horizontal fixation disparity.

As shown in FIG. 15, if the upper triangular optotype 18 appears to be shifted to the right or left from the position of the cross optotype 15, the left eye has a horizontal near fixation disparity. vice versa,
If the lower triangular optotype 17 appears to be displaced from the position of the cross optotype 15, the right eye has horizontal fixation disparity in the horizontal direction.

3-3) Each of the above-mentioned near fixation disparity inspections is an inspection in front view. When performing an inspection in a downward or upward view, the optotype plate 1 is held at a desired position on the front upper side or the front lower side with the hand.

3-4) If the spectacle section 31 of the optometer is not provided with a mechanism for setting the polarizing plate as described above, use a polarizing plate or polarizing glasses that are held.

4) Near Binocular Visual Inspection for Children In performing this inspection, the near binocular visual inspection optotype for the optotype plate 1 faces concentrically in parallel with the spectacle unit 31 of the optometer. The distance from the eye E of the subject located behind the spectacles section 31 is 4
Place it near to 0 cm.

As shown in FIG. 12, the optotype plate 1 is disposed in a horizontally long position, and is a star-shaped optotype 2 for a near binocular visual examination for children.
1 and the round target 22 are arranged on the left and right.

As shown in FIG. 7, a polarizing plate 41 having a polarization axis of 135 degrees and a polarizing plate 43 having a polarization axis of 45 degrees are provided for the left and right eyes of the spectacle section 31, respectively, as shown in FIG. I do.

When a healthy person using both eyes looks at the children's near binocular test optotype of the optotype plate 1 with both eyes through the spectacle section 31, the left eye sees the children's near binocular test optotype. The star-shaped optotype 21 on the left side is visible, and the circular optotype 22 on the right side is not visible. The right eye can see the right circular target 22 and the left star target 2
I can't see one.

If the child of the subject can see the star-shaped optotype 21 and the round-shaped optotype 22, the eyes are used. Speaking that only one target can be seen, one eye is not used while being suppressed, and only the other eye is used.

The above-described near binocular vision inspection for children is an inspection in frontal view. When performing an inspection in a downward or upward view, the optotype plate 1 is held at a desired position on the front upper side or the front lower side with the hand.

If the spectacle section 31 of the optometer is not provided with a mechanism for setting the polarizing plate as described above, use a polarizing plate or polarizing glasses that are held.

[0107]

By using the optotype plate of the present invention, a plurality of near vision function tests can be easily performed with an optometer or an optometer for visual acuity measurement and a polarizing plate or polarizing glasses on hand.
No separate test equipment is required. Does not require much labor and cost, and does not require a large storage space.

1) Since the Maddox method is used for the near oblique examination, much labor is not required, and the subject is hardly tired.

2) Since only a pair of optotypes is used in the near-unequal-vision visual inspection, much effort is not required, and the optotype production is simple. Also, no special red-green glasses are required.

3) An ophthalmoscope can be used for the near fixation disparity test, and much labor is not required.

4) For the near binocular vision inspection for children, an optometer can be used, and much labor is not required.

The optotype plate of the present invention has high durability when the polarizing film is covered with a transparent plate.

[Brief description of the drawings]

FIG. 1 is a front view of a near vision function test target plate according to an embodiment of the present invention.

FIG. 2 is a rear view of the same target plate.

FIG. 3 is a side view showing a state where the optotype plate is attached to an optometer.

FIG. 4 is a diagram when a near-horizontal oblique test is performed using a near-oblique test optotype on the same target plate;

FIG. 5 is a diagram when a near-vertical oblique test is performed using a near-oblique test test target of the same target plate.

FIG. 6 is a diagram showing a case where a near asymmetric image in a vertical direction is inspected with a near asymmetric image visual inspection target of the same target plate;

FIG. 7 is a diagram of a polarizing plate set in a spectacle unit of the optometer.

FIG. 8 is a diagram of another polarizing plate set in the eyeglass unit of the optometer.

FIG. 9 is a diagram when inspecting a near-unequal-vision image in the horizontal direction with a near-unequal-vision visual inspection target of the same target plate;

FIG. 10 is a diagram when a near-rotational oblique position is inspected by a near-unequal-vision visual inspection target of the same target plate;

FIG. 11 is a diagram when inspecting astigmatism with a near-unequal-vision visual inspection target on the same target plate;

FIG. 12 is a diagram for examining the near fixation in the vertical direction with the near fixation disparity test optotype of the same target plate, and for examining near binocular vision with the near binocular test optotype for children. Fig.

FIG. 13 is a view when inspecting near fixation in the vertical direction with a near fixation disparity test optotype of the same target plate.

FIG. 14 is a diagram when a near fixation in the horizontal direction is inspected with a near fixation disparity test optotype of the same target plate.

FIG. 15 is a diagram when inspecting the near fixation in the horizontal direction with the near fixation disparity test optotype of the same target plate.

[Explanation of symbols]

 Reference Signs List 1 synthetic resin plate, target plate 2 light source hole, point light source 3 scale of near horizontal oblique amount 4 scale of near vertical oblique amount 7, 8 9, 10 Polarizing plate 11, 12 Polarization axis 16 Scale of near fixation disparity amount 17, 18 Triangular target of near fixation disparity test target 19, 20 Polarizer 21 Near binocular vision for children Star-shaped optotype of target 22 Round-shaped optotype of near binocular visual examination for children 23, 24 Polarizer

Claims (2)

[Claims] 1. A plate that can be attached to an eye tester for measuring visual acuity and that can be held at a desired position by hand, and any two of the following four targets are provided on the plate. Or a near vision function test optotype plate provided with three or all of them. 1) Optotype of the Maddox method of the near oblique examination: A light source hole was penetrated through the plate, and a scale of the near oblique amount was provided on the plate surface with the light source hole as a reference point. 2) Optotype for near asymmetric image inspection: a pair of optotypes having symmetrical shapes and unequal dimensions are provided on the plate surface, each of the optotypes is covered with a polarizing film, and the polarizing axes of both polarizing films are orthogonal to each other. Arranged in the direction. 3) Optotype for near fixation disparity test: a pair of optotypes are provided on the plate surface, each of the optotypes is covered with a polarizing film, and the polarizing axes of both polarizing films are arranged in a direction orthogonal to the optotype. A scale of the amount of near fixation disparity was provided with the interval between the reference points. 4) Optotypes for near binocular vision test for children: two optotypes having a shape that is easy for children to understand are provided on the plate surface, each optotype is covered with a polarizing film, and the polarization axes of both polarizing films are orthogonal to each other. Arranged in the direction of 2. The visual acuity test board for near vision function according to claim 1, wherein the polarizing film is covered with a transparent plate.