JP3258982B2 - Near vision function test chart - Google Patents

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 testing 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] A subject appears to separate one target into two by the prism action of the rotary prism. The amount of the prism of the rotary prism is increased or decreased, and the optotypes that are 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. Individual test instruments should be set and used sequentially .
It takes a lot of trouble. In addition , purchasing a large amount of money is expensive and requires a large space for storage.

Furthermore, 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 time and effort and puts a burden on the muscles of the eye, and the subject is easily tired.

2) The near-distant-vision visual inspection 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. In the examination, since the red and green optotypes sequentially look at optotypes that are slightly different in size, much labor is required. 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) In the near fixation disparity test, polarized glasses and a target mounted on the front of a box containing a lighting fixture are used.
The optotype is not attached to the optometer, and it is difficult to hold the optotype at a desired position by hand. Arranging the optotype in front of the box at a desired position requires a lot of trouble .

4) The near binocular vision test for children uses polarized glasses and a target mounted on a frame. Optotypes are not attached to the optometer .

[0017]

[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 the optotype is covered with a polarizing film.

1) For the near oblique examination, the Maddox method, which is simple and does not impose a burden on the eye muscles, was used instead of the prism separation method. The Maddox method is used for a far-side 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 boundary of necessity of correction with glasses, 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.

[0023]

The optotype plate of the present invention is a rectangular plate that can be attached to an eye tester for measuring visual acuity and that can be held at a desired position by hand. Proximal oblique examination
The target of the Maddox method of the examination, the target of the
Square and provided with a visual target fixation disparity test, optotype Maddox method of the near phoria test, a light source hole penetrating in the plate, proximal oblique amount as a reference point of the light source holes on one surface of the plate has established the scale,
Optotypes of the near aniseikonia test, a pair of optotypes having unequal dimensions symmetrical shape <br/> half in another one side of the plate, both visual target eyes
The dimensional difference becomes necessity of boundary correction by mirrors, each optotypes coated with each polarizing film are arranged in a direction perpendicular to the polarization axes of both the polarizing film, optotypes of the near fixation disparity test Is the other of the board
A pair of optotypes are provided on the other half of one side of the surface , each of the optotypes is covered with a polarizing film, and the polarization axes of both polarizing films are arranged in a direction orthogonal to each other, and a distance between the two optotypes is set as a reference point. It provided the scale of the fixation disparity amount.

In the above-mentioned target plate of the present invention, the plate
And by providing a visual target of a child for near vision binocular vision inspection, near children
The optotype of the binocular visual examination is understood by the child on the other side of the board.
Providing two optotypes of easy shape, each optotype is a polarizing film
And arrange the polarizing axes of both polarizing films in the direction orthogonal to each other.
Was .

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Configuration] An optotype 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 half-octagonal optotypes 7, 8 which are opposed to each other across the cross optotype 6 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 bonded 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 left polarizing plate 9, 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.

At the lower position of the square black portion 5, a character "3% ANISEIKONIA TEST", which means 3% unequal image 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, as shown in FIG. ing.

On a white surface of the synthetic resin plate 1, a square portion 13 is printed in black, and a vertically elongated 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 for the amount of near fixation disparity. 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.

Star-shaped optotypes 21 and round-shaped optotypes 22 are printed in white on the left and right sides of the lower portion of the black portion 13, respectively. The star shape and the round shape are easy for children to understand.

On the left and right star-shaped targets 21 and the round-shaped targets 22, square polarizing plates 23 and 24 are bonded 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 polarization axis of the polarizing film of the left polarizing plate 23 is 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.

The letters "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 In 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 device 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 the horizontal oblique position, the 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 target overlap the point light source of the target. 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 overlaps 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-Irregular Image Inspection When performing this inspection, the near-irregular image inspection optotype of the optotype plate 1 faces concentrically in parallel with the eyeglass unit 31 of the optometer, and the eyeglass unit The distance from the eye E of the subject located behind 31 is 30 to
Place it near 40cm.

2-1) When inspecting unequal image vision 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 unit 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 is larger or almost equal to the small left octagonal optotype 7 on the left side, it is a near non-uniform image view within 3% in the vertical direction. Does not require eyeglass correction.

If the left small hemi-octagonal target 7 looks larger than the right large half-octagonal target 8, the left eye looks larger than the right eye, and the near unequal image in the vertical direction exceeding 3% appears. 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 test chart of the optotype board 1 with both eyes through the spectacle section 31, the large right octagonal chart 8 on the right side is displayed on the left eye, 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 image in the vertical direction exceeding 3%.

2-2) When inspecting the unequal image 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 whose polarization axis 42 is in a 135-degree direction and a polarizing plate 43 whose polarization axis 44 is in a 45-degree direction are set for the left and right eyes 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 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 less than 3% in the horizontal near unequal image. 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 more than 3% of the horizontal near unequal image is viewed. 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 upper half-octagonal chart 7 in the left eye is contrary to the above. 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 half-octagonal optotype 7 is larger than the lower upper half-octagonal optotype 8, the left eye looks larger than the right eye and more than 3% of the horizontal near unequal image is viewed. There is.

2-3) Each of the above-described near inequality 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 mechanism for setting the polarizing plate as described above is not provided in the spectacle section 31 of the optometer, 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 as 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 this test, 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 examining the 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 of 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 vertical 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 arranged 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, as in the case of the vertical fixation disparity test. The axis 44 sets the polarizing plate 43 in the direction of 45 degrees.

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 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 are 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 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 target for the children of the optotype plate 1 faces concentrically in parallel with the eyeglass part 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 at a horizontally long position, and is a star-shaped optotype 2 for children's near binocular visual examination.
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 eye and the right eye of the spectacle section 31, respectively. I do.

When a healthy person using both eyes looks at the children's near binocular test optotype on the optotype plate 1 with both eyes through the spectacles section 31, the left eye sees the child's near binocular test optotype. The star-shaped optotype 21 on the left side is visible, and the round-shaped 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 two 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.

When the spectacle section 31 of the optometer is not provided with a mechanism for setting the polarizing plate as described above, the user uses a polarizing plate or polarizing glasses on hand.

[0095]

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 trouble is not required and the subject is hardly tired.

2) For the near anisotropic visual inspection, correction using glasses
Since only a pair of optotypes having a dimensional difference at the boundary between positive and necessity is used, 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) An ophthalmoscope can be used for near binocular vision inspection for children, and much labor is not required .

[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 in which 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 test target 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 section of an 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]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin board, optotype board 2 Light source hole, point light source 3 Scale of near horizontal oblique amount 4 Scale of near vertical oblique amount 7, 8 Half octagonal shape of near unequal image visual inspection target 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 shape optotype of target 22 Round shape optotype of near binocular vision test target for children 23, 24 Polarizer

Claims (2)

(57) [Claims] 1. A rectangular plate that can be attached to an eye tester for measuring visual acuity and that can be hand-held and placed at a desired position . Near inequality
And provided optotype and optotype of the near fixation shift inspection of the inspection, optotype Maddox method of the near phoria test, a light source hole penetrating in the plate, the reference point of the light source holes on one surface of the plate The scale of the near oblique amount is provided , and the optotype for the near anisotropy test is provided with a pair of optotypes of symmetrical shape and unequal dimensions on half of the other surface of the plate. , Eyes on both targets
The dimensional difference becomes necessity of boundary correction by mirrors, each optotypes coated with each polarizing film are arranged in a direction perpendicular to the polarization axes of both the polarizing film, optotypes of the near fixation disparity test Is the other side of the board
A pair of optotypes are provided in half , each of the optotypes is covered with a polarizing film, and the polarization axes of both polarizing films are arranged in a direction orthogonal to each other. a near vision test optotype plate, wherein the kite <br/> provided scale. 2. A target for near binocular visual inspection for children is provided on a plate.
And has, proximal target of binocular vision inspection for the children, the children in addition to the one side of the plate
Provide two optotypes of easy-to-understand shape, each optotype
And the polarizing axes of both polarizing films are set
The near vision function test target plate according to claim 1, wherein the target plate is arranged .