JPS5841858B2 - Asymptotic gaze type vision training device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a training device for enhancing distance and near vision.

This device is used to recover or improve acquired true myopia, improve congenital myopia or hyperopia, prevent progressive myopia or presbyopia, correct astigmatism, correct anisometropia, etc. The main purpose is to improve near and far vision.

The asymptotic and near-point gaze type visual acuity training device, which was previously invented by the present inventor in Japanese Patent Publication No. 54-12159, aligns the direction of the line of sight from a fixed point with the spatial plane in which the straight target is moved, and moves the straight target. In order to enhance the training effect by gazing at the target while moving it to a distant or near place, a "+1" used to fix the training eye on the spatial extension line in front of the optotype plate of a spatial straight line that moves a fixed point of the linear optotype. A see-through plate with markings was placed on the track in front of the optotype plate.

However, this perspective plate places the intersection of the "+" marks in the middle of the line of sight from the training eye to a fixed point on the straight line target.
When practicing gaze by looking through a see-through plate, the presence of the "+" mark has the disadvantage of distracting the gaze to a certain point of the linear optotype and a portion of the linear optotype near it.

In addition, the fact that the see-through plate is located in front of the optotype plate has a gap that is disadvantageous in shortening the adjustment distance and saving the length of the trajectory on the front side of the optotype plate in the case of distance vision training. In the case of near vision training, it becomes an obstacle to moving the near (front) blade of the optotype board.

By the way, even if the training eye is placed on the spatial extension line of the spatial straight line that moves the fixed point of the linear optotype at the beginning of the training gaze,
If the viewing plate is removed from the line of sight directed toward the optotype, even if the training eye deviates from the spatial extension line of the spatial straight line that moves the fixed point of the linear optotype while fixating the optotype, it will not deviate. It is difficult to be aware of this, and as a result, it becomes difficult to continue gazing at the center line of the blurred visual impression of the straight line target, which has the disadvantage that the gaze training effect cannot be sufficiently enhanced.

Therefore, in the device of the present invention, the see-through plate of the device of Japanese Patent Publication No. 54-12159 is eliminated, its defects and obstacles are eliminated, and the direction of the line of sight from one plane matches the spatial plane in which the linear target is moved. A linear indicator is installed so that the target can be gazed at and moved, further enhancing the training effect.

In other words, a straight line of a straight line index consisting of a twill line sandwiched in a circumferential plane, a line marked on a flat plate, a tangible filament, etc. is matched with a spatial plane including the spatial plane in which the line target is moved. The straight line indicator is installed so as not to obstruct the gaze of the optotype and the movement of the optotype board, and the straight line of the linear optotype and the linear indicator are on a spatial plane including the spatial plane in which the linear optotype is moved. When viewed stereoscopically with a trained gaze and with a single eye, the straight lines appear to be in a straight line.The straight line target is moved at an appropriate position on the front side of the target plate on the spatial extension plane of the spatial plane. - Place the training eye and train your gaze while moving the linear optotype far or near, and during the fixation, the fixation eye deviates from the spatial extension plane of the spatial plane in which the linear optotype is moved. This also allows for quick and easy discovery and correction.

Currently, the most popular fixation training method for enhancing near and far vision is to fixate a fixed target, etc. from the fixed eye for the duration of each fixation (hereinafter referred to as fixed point fixation method). ).

The law generally instructs people to stare at a visual target of a size and distance that they can see (even if they can't see clearly) if they try hard enough.

However, although this method does not necessarily require any special devices or instruments, and is convenient because it can be easily implemented in daily visual life environments, the current situation is that it is almost ineffective for cases other than false myopia.

Next, we will discuss the mechanism of accommodation and its potential for visual acuity enhancement.

Over the past century, various theories, including conflicting theories, have been proposed regarding the mechanism of accommodation, but there is still no definitive conclusion.

Today, Mr. Helmholtz's relaxation theory is the mainstream.

For near vision, the crystalline lens swells due to its own elastic force as a result of the relaxation of Chin's zone due to the contraction of the ciliary orbicularis muscle, increasing the refractive power, and is adjusted only for near vision. , Distance vision is caused by the contraction and relaxation of the ciliary orbicularis muscle, and the adjustment is suspended during distance vision.

According to the relaxation theory, the swelling of the crystalline lens is caused by elasticity (
Although this appears to be due to a restoring force (passive), the present inventor analyzes that it is due to an organic (positive) swelling force of the flat crystalline lens subjected to external forces.

The former cannot explain the aging process of presbyopia, nor can it provide a rational basis for training to prevent it.

Furthermore, the relaxation theory does not affirm the existence of sympathetic nerves for distance vision, as they only adjust for near vision.

Therefore, according to Kaisetan, it is theoretically impossible to actively improve distance vision through training based on the action of the accommodative autonomic nervous system.

The present inventor supports the dual control theory of sympathetic and parasensory nerves, which actively controls both distance vision and near vision.

By the way, in the case of hyperopia and emmetropia, the respective far points are at infinity behind the eyes, and accommodation beyond that point is harmful, and furthermore, distance accommodation within a finite distance is also mediated by the elastic return movement of the accommodation muscles. Therefore, the sympathetic nerve tends to be disused, and in the case of myopia, active adjustment of side vision is necessary, so it is analyzed that both nerves are stimulated and developed.

Generally speaking, however, children are mostly farsighted in childhood, and as a result of the lack of stimulation of the sympathetic nerves at the most developed stage of this organ, its action is weaker than that of the sympathetic nerves.

However, this does not mean that the sympathetic nervous system basically does not exist, so it is possible to proactively enhance distance vision through appropriate stimulation training.

The present inventor considers the mechanism by which the sympathetic nerves are stimulated during distance vision and the width sympathetic nerves are stimulated during near vision as follows.

Sympathetic nerves and breadth sympathetic nerves are always accompanied by visual fixation movements, and they act antagonistically on the 110 effects of the lens optical system that are unique to each, causing involuntary, perturbatory, and microscopic rings on the retina. It makes small adjustments to make it bigger or smaller.

On the other hand, the voluntary nerves that try to focus their attention on the center of a blurred visual object point outside the accommodation range and see it clearly contract the ring of the already-divergent or unconverged image as a whole. I will encourage you to do so.

(I am not aware of whether this ring is a developed image or an unconverged image, nor am I aware that the narrowing effect of the lens optical system is causing the ring to contract.

) The sympathetic nerve, which performs the necessary action (one action in the case of a developed image, the action in the case of an unconverged image) of the lens optical system necessary for the overall contraction of the ring by this gaze, or , voluntary nerves stimulate the sympathetic nerves by forming neural connections in a captive manner through their cooperation,
It is considered that by maintaining and strengthening its operating state, it is possible to clearly see the visual object.

Accommodative action is an action that attempts to align the image of an external object on the retina (without moving the object far or near), and enhancement of distance visual acuity is an action that attempts to adjust the image of an external object onto the retina (without moving the object far or near). It is simply a matter of adapting eye function and structure in a way that is effective and rapid.

The accommodative effect of the above-mentioned mechanism occurs in the same way outside the accommodative range, so if you practice rationally promoting this process patiently over time, the accommodative response (all movements that adjust the focus on the retina) ) increases in speed and level until it is done as a conditioned reflex, and the ocular structure also adapts to it,
It is possible to not only treat pseudomyopia but also to improve distance and near vision.

Hereinafter, definitions of the following terms will be described to facilitate this explanation.

When a straight line of a spatial plane linear visual target that includes a spatial plane is spatially moved in parallel to the axis of a linear trajectory, the trajectory can be regarded as one spatial plane.

If we limit the linear movement of the linear visual target to a certain section, then with respect to this limited spatial plane, we can: ■ This limited spatial plane or the same space as this spatial plane. plane, i.e. the same position as the original spatial plane,
A spatial plane of the same shape and size, ■ Extending in the same plane direction as this limited spatial plane (
Three types of spatial planes can be considered: a spatial plane (of a part), and a spatial plane that includes two spatial planes, ■■ and ■.

The "spatial plane including the spatial plane on which the linear visual target is moved" in the present invention refers to the case (2) above.

Visual impression refers to the image of an object in the external world that is subjectively recognized by the visual function.

Suppose that a bundle of light rays emitted from a certain object point in the visual field, the visual object point, and the visual field are converged at one point on the retina.

At this time, one point on the retina is called the viewpoint, one object point in the outside world is called the viewing object point, and the straight line that connects the two is called the line of sight.

The fixation point is the one point in the central fossa when a person is concentrating most on looking at an object in the outside world, and the fixation object point is the object point in the outside world that is the object of that focus, and the two are connected in one breath. A straight line is called a fixation line.

When you look at an object point outside the accommodation range, on the retina, one viewpoint in the generated ring is the circular ring perspective, and the visual object point in the outside world that corresponds to this circular ring perspective is the circular visual object point. The connected line of sight is called the circle line of sight.

- The cone-shaped line of sight emanating from each of the numerous points of the ring converges eastward towards the end, and from here towards the field of view corresponding to the ring, a circle of inverse similarity, a cone shape It diverges as a bundle of eyes, and the object point to which the circle corresponds is subjectively recognized as a visual impression of being seen as a dog.

The series of gaze fluxes at this time is called the circular gaze flux and the gradual near-point fixation method developed by the present inventor, which is implemented in the present invention, is a method for training to improve distance vision in eyes with insufficient distance vision such as nearsightedness. In cases where the target is placed at the far point and seen clearly, the eye is moved to a far distance while gazing at it, and in the case of near vision enhancement training for eyes with insufficient near vision such as hyperopia or presbyopia, the target is placed at the far point and seen clearly at the near point. This is a distance vision training method that involves repeatedly gazing at an optotype and moving it closer.

Next, we will discuss the basic principles of efficient implementation of the gradual near-point fixation method.

Since the central fovea of the retina is located near the optical axis of the eyeball, for convenience of this explanation, rays passing on the fixation line are considered to be paraxial rays.

Although the directions of a certain viewed object and its visual impression do not necessarily match, the relative positional relationship in the configuration of each point of the visual impression corresponding to the countless points on the viewed object does not change in principle.

Then, in the process of gazing at a fixed single-view object point in the outside world and changing the refractive index of the refractive system such as the crystalline lens or the axial length of the eye to accommodate clear vision, the locus of the imaging point and the first destination point to the single-view object in the outside world. The locus of the imaged point in the process of moving while gazing at the same viewing object point on a straight line passing through the side of the road passes along the straight line from the second node to the fixation point, and when the ring is contracted, it moves toward that locus. In other words, when the circular line of sight is converged, it is converged toward its center line.

Therefore, when trying to clearly see an object point outside the accommodation range, align the fixation line with the center line of the eyelid flux pointing towards the visual impression of that object point, and direct the eyelid flux towards the center line. If you make an effort to converge, that is, to focus your attention on the center of the visual impression of a blurred point (or object), you can stimulate the regulatory autonomic nerves most efficiently.

This is the essence of the gaze training method. All living organisms will not respond unless a stimulus of strength exceeding their threshold is applied.

When the stimulation intensity does not reach the threshold, the stimulation effort is in vain.

The same applies to the accommodation organs of the eye (those that function to focus on the retina, such as accommodation and refraction).

For accommodation reactions that are difficult to respond to, in order to increase the stimulus amount per unit of accommodation response, instead of trying to overcome the accommodation response all at once as in the stable gaze method, the stimulation intensity should not be lowered. Increase stimulation time.

By repeating the stimulus response using this method,
It is possible to increase the speed and level of accommodation reactions both temporally and energetically.

The following three items are elements of increasing water droplet efficiency and are based on the principles described above.

A. Use as delicate a target as possible to see clearly at the required far and near points.

B. Position the fixation object point of the visual target on a spatial straight line that includes the line of sight in one direction, or on a spatial plane that includes that line of sight, from the far point to the far distance in the case of far vision enhancement, or from the far point to the far distance in the case of near vision enhancement. Move from near point to near point.

A visual target straight line is aligned with the spatial plane.

C. Enhancement of distance and near vision 1. Move the optotype slowly to the extent that it is difficult to see, and the closer to the required far point and near point in B above (however, this does not apply when clear vision is possible).

By the way, if even the element (2) among these three elements, AlB and C, is missing, the effect of the water droplet stage cannot be fully exhibited.

For example, in A, if the optotype is too large, the effect will deteriorate (this is a common factor with the conventional method), and in B, if the direction of the line of sight is misaligned with respect to the movement line or movement plane of the fixation object point of the optotype. If the target becomes too large or vibrates in a direction perpendicular to its movement line or plane, it will be less effective than the conventional fixed-point gaze method, and when the target moves extremely rapidly in C, the conventional fixed-point gaze method It has almost the same effect as the law.

Next, the theory and practice of the details of implementing the present invention will be described.

(1) Regarding the line width of the straight optotype, not only the retinal surface without a ring, but also the visual field corresponding to the inner surface of the ring collecting surface, the stimulation of the accommodative autonomic nerve due to the above-mentioned accommodative micromovement does not occur.

The smaller the ring gathering surface is, the easier it is to converge the line of sight directed toward the corresponding visual impression of one ring within the ring towards its center line.

If the optotype is made smaller, the ring collection surface can also be made smaller accordingly.

Therefore, in the present invention, a linear visual target that is as delicate as possible is used at the clear vision limit point (far point or near point) of the accommodation area closer to the accommodation target direction.

(2) Planar movement of the linear optotype If the optotype vibrates in a direction perpendicular to the moving spatial plane during gaze movement of the linear optotype, it will be difficult to converge the eye flux in that direction. To make the contact surface between the optotype board piece and the straight track as smooth as possible.

(3) About the fixation line and target movement plane From one training eye on the spatial plane that includes the straight line of the moving target and the straight line of the installed straight line index, view the two straight lines stereoscopically, and the two lines are aligned in a straight line. The training eye is placed at an appropriate position in front of the trajectory that is visible, and is not fixed, and the target is gazed at and moved without aligning the fixation line with the spatial plane in which the linear target is to be moved.

By the way, when moving the visual target, the training eye deviates from the spatial extension plane of the spatial plane in which the linear visual target is moved, and the fixation line from the training eye is directed toward the spatial plane in which the visual target is moved. The larger the angle, the more difficult it is to set the fixation line at the center line where the visual flux converges, so when the training eye deviates from the spatial extension plane of the spatial plane on which the straight visual target is moved, Promptly correct it to prevent the deterioration of the training gaze effect.

(4) Regarding the gaze target straight line and its direction of distance movement, in the case of a straight target, the eye flux is converged also in the straight line direction, but this is passive, and in the direction perpendicular to the straight line. The line of sight is actively converged.

Therefore, in the case of training an eye with non-astigmatic abnormal distance and near vision, gaze training is performed by appropriately changing the direction of the optotype straight line within 180 degrees to avoid regular astigmatism.

In the case of myopic astigmatism, practice gazing at a straight line target perpendicular to the meridian of the strongest refractive power, and in the case of hyperopic astigmatism, to the meridian of the weakest refractive power.

For non-astigmatic subjects, the visual target is moved from the far point to the far point in the case of distance vision training, and from the near point to the near point in the case of near vision training.

In the case of myopic astigmatism, the front focal line is on the retina and the distance is from the intersection point (line), and in the case of hyperopic astigmatism, the back focal line is on the retina and the intersection point (line) is towards the distance. Gaze at the target and move towards it.

When the visual target is moved from the limit point of the accommodative region to the outside of that region,
The visual impression gradually increases in size, but this antagonistically stimulates the voluntary nerve's gaze toward the center of the visual impression.

(5) Regarding the distance movement speed of the optotype, generally speaking, the optotype is gazed at and moved slowly to the extent that it is difficult to improve distance vision.

This is to increase the amount of stimulation per unit of eye accommodation response.

Therefore, the benefits of this device are inappropriate for mild pseudomyopia with a short accommodative relaxation time.

As the visual impression corresponding to the eyelid becomes larger during gaze movement of the optotype, the visual impression surface becomes wider. Since the (quasi) radius of the ring line flux becomes longer, the amount of adjustment required for its convergence increases.

Therefore, in order to set the fixation line at the center of the corresponding visual impression and increase the stimulus amount per unit of the eye accommodation response while the target movement has not yet progressed and the ring is small, the target can be adjusted to suit each accommodation purpose. After seeing the clearest at the limit of the accommodative range in the direction, the area near the accommodative limit point, that is, in the case of distance vision training, the area farther from the far point and closer to the far point, and the area closer to the far point for near vision training. In this case, the closer to the periapsis point, the closer to the periapsis point, the more energy and time should be concentrated on visual target fixation (however, this does not apply when clear vision is possible), while taking into account the degree of clarity in the direction of the adjustment objective Move your gaze slowly as appropriate.

In other words, even when training visual acuity for distance and near vision, the optotype should be placed at the far point and near point so that the optotype that used to appear small when viewed clearly does not become blurred and appear larger. Move your gaze to the distance and near.

(6) - Eye Training Gaze When using this device to train both eyes to gaze at the same time, normally it is not possible to move the fixation line of both eyes while aligning them with the spatial plane in which the linear target is to be moved. A decline in effectiveness is inevitable.

To prevent this decrease in effectiveness, the trajectory could be made longer, but this would make it impractical as a home exerciser.

Therefore, the principle of the present invention is to train the gaze with one eye.

-Cover the small limits during eye gaze training. For anisometropia, the eye with poorer visual acuity should be trained to gaze until it has the same visual acuity as the other eye.

(7) Regarding wearing adjustment glasses, etc. Since there is a large difference in ommatidia in the far point distance and near point distance of the eye with abnormal distance vision, the length of the trajectory for moving the optotype plate should be adjusted to an appropriate length that is easy to use as a home training device. The far point and near point distances are adjusted by standardizing the distance to a suitable length and wearing concave or convex glasses to match this length.

(8) Regarding the movement of the trajectory of the optotype plate, if the far point and near point distances and trajectory are shortened by wearing adjustment glasses, the movement of the optotype plate can be easily carried out manually or manually with an instrument.

(9) Regarding the nystagmus prevention device, use a device that can be attached to the top of a desk, etc. at the bottom of the tip of the track, and connect a face pad, etc. to the front of the track to prevent nystagmus.

(10) About training time It is desirable to have a regular daily routine and train at a regular time, but this is often difficult in practice.

When your eyes are tired, the training effect will not be as good.

You can do it for a long time as long as it does not cause too much eye fatigue.

The total maximum permissible training time per day is determined by the condition of each training eye, since the difference in ommatidia is large.

Next, the utility and effects of the present invention will be described.

The present invention is a device invented with the main purpose of enhancing the far and near visual acuity of an eye with abnormal far and near vision that is difficult to enhance, and is not suitable as a visual acuity training device for cases such as false myopia, which has a rich recovery ability.

Regarding false myopia, it is possible to improve the current fixed-point gaze method (within the constraints of visual target fixation) in a rational way; , since its prevention or recovery is quite possible, it has been excluded from the main purpose of the present invention.

If the device of the present invention is practiced while observing the above-mentioned precautions, it will be more effective than the conventional fixed-point gaze method for eyes with difficulty in improving near and far vision under the same conditions.

However, for example, even if congenital severe myopia in an elderly person is trained using the device of the present invention and the method described above, the visual acuity will improve numerically when training pseudomyopia in a child who has recently been diagnosed using the conventional fixed-point gaze method. In general, the factors that influence distance and near vision are much larger than the factors that produce the difference between the two effects, as is significantly enhanced in

In this way, the strength and weakness of near and far vision, as well as increases and decreases, are greatly related to various conditions such as a person's predisposition, age, period of disease, visual living environment, and health condition, so we will carefully select what is possible among them. If you take the time and persevere to train the gradual periapsis gaze method using the device of the present invention with the above-mentioned precautions, it is said to be almost impossible with today's ophthalmological treatment (excluding surgery) or training methods. It is also possible to restore or improve acquired true myopia, to improve congenital myopia or hyperopia, to prevent progressive myopia or presbyopia (presbyopia cannot be prevented indefinitely), and to correct regular astigmatism.

Embodiments Two typical embodiments of the present invention will be described with reference to the accompanying drawings.

First example The embodiment according to FIG. 1 is shown.

A triangular mound-shaped straight track 1 having a length of about 40 cIft is placed above with a straight line indicator 5 made of twill lines sandwiched between both smooth slopes.

A horizontal straight line indicator 2 with a width of 0.05 to 0.1 pointing toward the twill line indicator 5 is marked on a circular indicator board 3 with a diameter of 5 cIrL.

The straight line of the horizontal straight line target 2 can move on the spatial plane 9 in which the straight line target 2 is moved, which is parallel to the axis of the linear trajectory 1, and the straight line of the twill line target 5 can move on the spatial plane 9 that is parallel to the axis of the linear trajectory 1, and to match the spatial plane 10 containing the spatial plane 9 to be moved.
The optotype board 3 is attached to the top 4 and placed on the track 1.

A diameter 6c with a linear linear indicator 6 marked in the text area with the spatial plane 10 including the spatial plane 9 on which the horizontal linear optotype 2 is moved.
Attach the index plate 7, which is a circular flat plate of rfL, to the top 8 and set the trajectory 1.
installed at the very tip of the

Incidentally, in order to gaze at the vertical optotype, a vertical optotype 2' is marked on the optotype plate 3, and a vertical index 6' is marked on the index plate 7.

An example of using this device for training true myopia of -9D is shown.

-When wearing 2D concave glasses, the far point distance for training is approximately 14C.
Adjust to rfL.

An optotype plate 3 marked with a horizontal linear optotype 2 is placed on the track 1 at a distance of about 106 rrL from the frontmost part of the track 1, and the track 1 is fixed.

In the spatial extension plane 11 of the spatial plane 9 on which the horizontal straight line target 2 is moved, that is, the straight line of the right horizontal straight line target 2 and the straight line of the twill line straight line indicator 5 or the straight line of the right horizontal line straight line indicator 6, the right training A spatial plane in which these straight lines appear to be in a straight line when viewed stereoscopically with the eye 12, and approximately 14 of the adjusted far point distance from the visual target 2.
cIfL1 The right training eye 12 is placed at a position approximately 4 crrL to the right from the near side extension line of the twill line straight line indicator 5.

Mouse and cover your left eye. A spatial plane 9 in which the linear optotype 2 is moved while staring at the right side of the linear optotype 2 by staring at the optotype 2 with the right training eye 12 and then manually moving the optotype board 3 to gaze at the right side of the linear optotype 2. Repeat the process of moving up to a viewing distance of 24 cfrL.

From the viewing distance of about 14 cfrL (adjusted far point distance) to optotype 2 at the start of gaze movement, the gaze time for each movement of optotype 2 by 1 crrL is approximately 40.40.37.32.25.18.1
015.2.0 seconds.

In this way, the closer you are to the far point, the more time you spend gazing at it.

When the gaze shift process for the right horizontal target 2 is completed, the gaze shift process for the vertical target 2 is performed in accordance with this process, and swerving training is repeated.

The left part of the horizontal optotype 2 is used for training the left eye.

Second example 2 shows an example of a device according to FIG. 2;

A trapezoid-like linear track 13 having a length of about 40 cWL and having both smooth slopes is placed.

Fiber index support legs 1919' are erected at both upper ends of the track 13.

A filament indicator 17 made of a tangible object is placed in a straight line on support legs 19 and 19' so as to be parallel to the axis of the linear track 13.

A width of 0.05 to 0.1 mm passing through the center of rotation of the optotype plate 15
A straight optotype 14 is marked, and an index filament through hole 18 is made at the center of rotation of the optotype root, so that the optotype plate 15 can be freely rotated and stopped.

The fibrillated linear index 17 is inserted into the filament through-hole 18 so that the straight line of the linear target 14 can move on a spatial plane 20 parallel to the axis of the linear trajectory 13 and on which the linear target 14 is moved. , and the optotype plate 15 is attached to the top 16 and placed on the track 13 so that the straight line of the filament linear indicator 17 matches the spatial plane 21 including the spatial plane 20 on which the linear optotype 14 is moved.

Note that it is convenient to mark the linear optotype 14' on the optotype plate 15 in a direction perpendicular to the linear optotype 14 when gazing at the optotype in the vertical direction.

An example of how this device is used to train farsightedness with a far point distance of 3D and an accommodation force of 6D is shown.

The near point distance of this hyperopic eye is approximately 33 cIrL.

The optotype plate 15 is placed on the track 13 at a distance of about 30 mm from the frontmost part of the track 13, the track 13 is fixed, and the linear optotype 1 is placed on the track 13.
4 is moved in the spatial extension plane 22 of the spatial plane 20, that is, the straight line of the horizontal straight line target 14 and the straight line of the filamentous straight line index 17 are viewed stereoscopically with the right training eye 23, and the two straight lines are aligned in a straight line. The right training eye 23 is placed at a position approximately 3 cIrL to the right from the near-side extension line of the filament linear index 17 of approximately 33CIrL1, which is the near point distance of this hyperopic eye from the optotype 14, on a spatial plane that can be seen.

Mouse and cover your left eye. Thereafter, training is performed by performing a day shift process of staring at the target in accordance with the first embodiment.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the first embodiment, and FIG. 2 is a perspective view showing the second embodiment. 1... Straight trajectory, 2... Horizontal linear optotype, 2'... Vertical linear optotype, 3... Optotype board, 4... ...Optotype board frame, 5...Twill line straight line indicator, 6...Horizontal line straight line indicator, 6'...
・・Vertical linear linear index, 7 ・・Indicator board, 8 ・・
...Indicator board piece, 9...Spatial plane on which the linear optotype 2 is moved, 10...Spatial plane on which the linear indicators 5 and 6 are installed and on which the linear optotype 2 is moved A spatial plane including 9, 11... A spatial extension plane of the spatial plane 9 in which the training eye is positioned and the linear optotype 2 is moved, 12...
...training eyes, 13...straight trajectory, 14...
... Straight optotype, 14/... Straight optotype perpendicular to the linear optotype 14, 15... Optotype board, 16.
...Optotype board frame, 17...Filament linear indicator, 18...Indicator filament through hole, 19, 19'...
...Filament indicator support leg, 20...Light optotype 14
spatial plane to move, 21... Linear index 17
a spatial plane including a spatial plane 20 on which the linear optotype 14 is moved, 22...a training eye is positioned;
A spatial extension plane of the spatial plane 2o on which the linear optotype 14 is moved, 23... Training eye.

Claims (1)

[Claims] 1. On a spatial plane including a spatial plane in which a linear optotype marked on an optotype board mounted on a straight track is moved parallel to the axis of the linear track, a ridge line sandwiched between the circumferential planes and a mark marked on the flat plate A far and near visual acuity training device for gazing at an optotype while moving it far or near, characterized in that a straight line indicator made of a filament or a tangible filament is installed with a straight line aligned.