JP3244340U - Science teaching materials for optics learning - Google Patents

Abstract

[Problem] In addition to learning optical principles, it is possible to learn the presence or absence of refractive error, its causes and conditions by oneself, and even children and children can easily use it as if it were a play, and it has the possibility of early detection of refractive error. Provide science materials for learning.
[Solution] A light-shielding plate 3 in which two light-transmitting holes 4 are bored at an interval narrower than the pupil diameter in a cylindrical eyepiece body 1 placed just in front of the eye E of an observer, for example, a learner or an eye subject. An eyepiece 2 is provided, and a cylindrical light shielding part 5 is provided in front of the eyepiece 2. The transparent hole 4 has a circular shape with a diameter of 1.0 to 2.5 mm and a mutual interval of 0.5 to 2.5 mm, or a slit shape with a horizontal width of 1.0 to 2.5 mm. , the length is 3.0 to 7.0 mm, and the mutual spacing is 0.5 to 2.5 mm. Further, the eyepiece section 2 is provided with a rotation mechanism for rotating the light shielding plate 3.
[Selection diagram] Figure 2

Description

This idea allows observers to learn and acquire optical principles on their own without having specialized optical knowledge based on optical principles, by observing the differences in the way an object appears when looking at it. This allows us to be aware of whether the image is in optical focus or not, and more specifically, it is qualitatively determined whether the image is focused on the focal plane on the retina, backwards or forwards. This invention relates to science teaching materials for optics learning, which can be learned visually and can be checked by oneself in a simple and easy way, and which is particularly suitable for preschool children.

Conventionally, various optometry devices have been used to test the visual acuity of subjects, who are asked to gaze at a measuring target placed a certain distance away, and depending on how they see, Doctors correct this by interposing various types of lenses that enable emmetropic vision, and depending on the type of lens, determine whether the patient has nearsightedness, farsightedness, or astigmatism.

Currently, objective eye examination apparatuses are used that measure the refractive power of the eye to be examined by projecting measurement light onto the eye to be examined and receiving the measurement light reflected by the eye to be examined. Examples include an ocular refractometer shown in Patent Document 1, an optometry device shown in Patent Document 2, an objective optometry device shown in Patent Document 3, and the like.

By the way, in the initial learning of ocular refraction related to ocular optics, it is assumed that the visual aspect is understood, such as whether the eye is emmetropic with normal vision or the eye is abnormally refractive, which is called myopia, hyperopia, astigmatism, etc. Emphasis is placed on optically measuring and measuring visual aspects. Many of the optometry devices currently used for eye refraction tests (refractive power) are manufactured based on the results of clinical trials based on the principle of pin-focus, which was developed by physicist Thomas Young in his experiments. Objective optometry devices such as optometers that measure refractive power using the coherence of the lens were created, and as a result of subsequent developments, various types of such objective optometry devices are now available.

Measurement with this optometer is based on Shiner's principle, which applies pin focusing, and two pins are drilled at extremely narrow intervals in a light-shielding plate (disk) placed at a distance of about 12 to 15 mm in front of the eye. Holes are provided, and these two pinholes are worn at the center of the eye to observe the visual field in front of the eyes. In this case, two pinholes will appear to partially overlap on the fundus.

By the way, in general, the refractive state of the eye is that, as shown in Figure 4, when looking through a pinhole with an emmetropic eye, the visual image from far to near has a confocal state on the retina of the eyeball. seen as a series of distinct fields of view. In an ametropic eye, the focal position shifts (deviates) from the position in an emmetropic eye. As a result of such a shift, two types of images appear, one in which the outline of the pinhole overlaps and the other, resulting in an overall vague image. Such a deviation is corrected by moving the focal point to the correct position on the retina using a correction lens with appropriate refractive power, and the refractive error is corrected by creating a confocal spot on the retina. In other words, the inspection determines that there is an abnormality in refractive power due to the intervention of the correction lens.

Such measurements are based on the physicist Scheiner's considerations regarding optics, and to explain further, as mentioned above, holes are made in a light-shielding plate (disc) placed in front of the eye at intervals narrower than the pupil diameter. When looking at the fixation point, which is an optotype, through two pinholes, the optotype can be seen clearly in emmetropic eyes because the focus is on the retina, but in myopic and hyperopic eyes, where the focus is not on the retina, it is clearly visible. becomes lower. Also, when viewing the optotype through a light-shielding plate, if one of the pinholes is blocked and the optotype that was on the same side as the one that was blocked disappears among the two visible at the same time, it is myopia. If I disappear, it is considered farsighted. Next, a lens having a predetermined refractive power is placed in front of the disk placed in front of the eye, thereby obtaining a focus on the retina. As a result, the refractive error power can be measured based on the refractive power of the lens that has been focused.

However, the correction data obtained by such a test method is an objective test value, and is used to correct visual acuity. For example, it is indicated as "spherical power," "astigmatic power," "astigmatic power axis power," etc. listed on prescriptions prepared at ophthalmological medical institutions.

On the other hand, the currently used testing method, called subjective testing, uses so-called subjective testing equipment to perform measurements at a certain distance with the naked eye or through a corrective lens for people with refractive errors obtained through the above-mentioned objective testing. It is used to determine whether a visual target can be recognized or not, and is expressed as a numerical value such as visual acuity = 1.2, for example.

In addition, people with refractive error should wear glasses equipped with corrective lenses that correspond to the degree of refractive error obtained as a result of measurement using testing equipment, and only then will they be able to identify the cause of their own refractive error condition. You will know the classification of. People with refractive error usually notice that their vision is out of focus, or in general terms, their vision is blurred, but at the time they notice it, they are not sure if it is due to nearsightedness, farsightedness, or astigmatism. Since there is no way to understand whether the condition is correct or not, the patient must wait for a diagnosis from a specialist at an ophthalmological medical institution.

Tests by ophthalmological medical institutions are conducted under the supervision of specialists such as ophthalmologists and optician technicians through objective tests using optometry equipment such as those mentioned above, but in general, the situation and degree of the abnormal condition are determined. It is difficult to recognize in the early stages, and people often visit a specialist when it starts to interfere with their daily lives. If recognized and identified early, it is possible to recover or delay the progression of the disease by receiving accurate diagnosis and treatment for each cause. However, many people hesitate to receive a diagnosis from a specialist because they think it would be a hassle.

Japanese Unexamined Patent Publication No. 7-136118 Japanese Patent Application Publication No. 8-256981 JP2021-137260A

Therefore, by learning how the refractive state of one's own eyes, including people with normal vision, affects their daily lives and being aware of this from an early age, it is important that people learn how abnormalities affect their lives. If we could provide a method that allows patients to perceive the disease, it would be possible to receive highly accurate treatment from a specialist earlier, and to be cured using an accurate method. On the other hand, if normal people and those who are already using corrective measures could voluntarily check the presence, degree, and degree of refractive error on a daily basis using a simple method, it would be possible to shift to early treatment by a doctor. You can expect it.

In particular, in recent years, there has been much talk of display syndrome (VDT), which is associated with the rapid adoption of IT, and myopia in young children and schoolchildren has become a problem, and many of these cases are often pointed out during school checkups. However, school examinations only determine the presence or absence of visual acuity abnormalities, and do not diagnose and do not know whether the refractive error that is the cause of the abnormal condition is due to myopia or farsightedness. It remains as it was. Hyperopia is one of the things that is overlooked in tests even though school children have visual acuity abnormalities, and because hyperopic visual acuity can be accompanied by amblyopia, screening is required before school age. It is being However, in general, visual acuity examinations are not conducted by specialists until the school examination after the age of 3, so children currently rely on observation at home.

Therefore, this idea was devised in view of the existing circumstances as mentioned above.When a refractive error occurs not only in infants and schoolchildren, but also in the general public, it is difficult to determine whether it is due to farsightedness, myopia, or astigmatism. This allows users to guess for themselves whether the eyeball is in the eye or not, thereby encouraging accurate optometric examinations by specialized eye treatment institutions.It can also be used easily at any time and anywhere, and can also be used as a science teaching tool to help understand the mechanism of the eyeball. The objective is to provide scientific teaching materials for optical learning.

In order to solve the above-mentioned problem, in this invention, two transparent lenses are installed in the cylindrical eyepiece body 1, which is placed just in front of the observer's eye E, and are separated within a range narrower than the pupil diameter. The eyepiece 2 is characterized by having an eyepiece 2 equipped with a light shielding plate 3 having a light hole 4 opened therein, and a cylindrical light shielding part 5 disposed at the front of the eyepiece 2.
The eyepiece part 2 is circular and can be configured such that at least one of its upper and lower edges or left and right edges is provided with chamfered edges 6 that are substantially parallel to each other.
The transparent holes 4 can be configured to have a circular shape, a diameter of 1.0 to 2.5 mm, and a mutual interval of 0.5 to 2.5 mm.
The transparent hole 4 has a slit shape with a horizontal width of 1.0 to 2.5 mm, a length of 3.0 to 7.0 mm, and a mutual interval of 0.5 to 2.5 mm. be able to.
The eyepiece 2 can be configured with a rotation mechanism 10 that rotates the light shielding plate 3. The rotation mechanism 10 rotates the light shielding plate 3 within a circular guide groove 11 formed in the eyepiece 2. The light shielding plate 3 is housed by rotatably fitting the circumferential edges of the eyepiece 2 , and a guide slit 12 communicating with the guide groove 11 is formed on the outer periphery of the eyepiece 2 so as to protrude outside the eyepiece 2 through the guide slit 12 . The operating piece 13 formed in this manner can be attached to the light shielding plate 3.

In the optical learning science teaching material of this invention constructed as described above, the eyepiece section 2 of the eyepiece main body 1 is brought close to the eye E of the observer, for example, the learner or the eye subject, and the eyepiece By looking at the index through the two transparent holes 4 of the light-shielding plate 3, a person can determine whether the focal point is on the retina (emmetropia), in front (myopia), behind (hyperopia), or even By rotating the transparent hole 4, the user can recognize and perceive whether the focal line shift (astigmatism) is due to meridians, and learn optical principles.
Ambient light is blocked by the light shielding part 5, and the incident light that passes through the two light transmitting holes 4 is gradually brought closer to the eye E, in combination with the fact that the distance between the light transmitting holes 4 is narrow. The visual field images overlap closely and the visual field images visible within the overlapping portion and the visual field images visible on the left and right sides thereof allow the user to judge for himself whether or not there is an abnormal state.
On the other hand, the presence or absence of an abnormal state can also be sensed by moving or even rotating the light-shielding plate 3 in front of the eye or the teaching material itself along the left and right or up and down directions while gazing at the optotype. In other words, if the optotype visible within the overlapping area does not move despite the movement of the teaching materials of this application, it is determined to be a focus on the retina (emmetropia), and if it moves in the opposite direction to the movement direction, it is determined to be a focus in front (myopia). If it is in the same direction as the direction of movement, it is determined that the focal point is backward (farsightedness), and if the distance of movement is large, it is considered to be severe myopia or farsightedness.
In addition, if the visibility of the optotype is not clear even when gazing at the optotype, rotating the light-shielding plate 3 while gazing at the optotype will change the sharpness of the optotype, resulting in focal line shift (astigmatism). ), and the rotational phase angle allows us to estimate the degree of astigmatic axis.
A rotation mechanism 10 provided in the eyepiece section 2 rotates the light shielding plate 3 without changing the reference rotation position of the eyepiece body 1, and makes it possible to measure the rotation angle from the reference position, thereby determining the degree of focal line deviation. make measurement even more effective.

Since this device is configured as explained above, an observer, such as an optical learner or an eye testee, can see the optotype in front of his or her eyes through the transparent hole 4 of the teaching material of this application, and can see how it looks. It is useful for optical learning based on the difference in vision, and it is also possible to easily know whether or not there is an abnormal condition in one's own eye E by the difference in the way of seeing, and if there is an abnormality, early treatment can be encouraged. Furthermore, even children and children can easily use it as if it were a play.

That is, in this invention, a cylindrical eyepiece body 1 placed just in front of the observer's eye E is provided with a light shielding plate 3 having two light-transmitting holes 4 bored in an area narrower than the pupil diameter. This is because the eyepiece 2 and the cylindrical light-shielding part 5 arranged in the front part of the eyepiece 2 are provided, and the presence or absence of refractive error, its degree, etc. can be determined depending on the difference in visual appearance between the learner and the subject. Learners and test subjects will be able to perceive by themselves.

In addition, the two light-transmitting holes 4, whether circular or slit-shaped, are arranged at an interval narrower than the pupil diameter, so that each incident light passing through the light-transmitting holes 4 is blocked. As the plate 3 approaches the front of the eye, they gradually overlap, and by having the learner recognize the difference between the optotype that can be seen within the overlapping area and the optotype that can be seen to the left and right or left and right of the plate 3, the learner and the patient can understand the situation and degree of refractive error. It can be perceived by the optometrist himself.

The rotation mechanism 10 provided in the eyepiece section 2 can rotate only the light shielding plate 3 without rotating the eyepiece body 1. For example, by measuring the rotated angle with respect to the eyepiece body 1 at the reference position, the focal line shift can be corrected. You can know the axial degree when looking forward (myopia) and backward (hyperopia).

Incidentally, the reference numerals added in each section of the means for solving the above-mentioned problems and the effects of the invention are added to facilitate reference to the parts indicating each component described in the drawings. This invention is not limited to the structures, shapes, etc. shown in these descriptions and the symbols in the drawings.

It is a perspective view showing one form for carrying out this idea. It is also a sectional view. It is also a front view of the disk, and each of (A) to (D) thereof shows a different aspect. It is also a mock diagram of an eyeball explaining the focal position in emmetropia, hyperopia, and myopia. FIG. 4 is an explanatory diagram of the field of view of an observer during use. FIG. 6 is an explanatory diagram of how the visual target appears to an observer when looking at the same index. FIG. 6 is an explanatory diagram of the moving state of the optotype as seen when the observer moves the indicator left and right while looking at the indicator. It is a sectional view of the rotation mechanism similarly in other embodiments.

Hereinafter, one form for carrying out this invention will be explained with reference to the drawings. Reference numeral 1 shown in the drawings is an eyepiece body, and this eyepiece body 1 is used to confirm the observation of an observer, for example, a learner or an eye subject. It is provided with a light shielding plate 3 which is formed in a cylindrical shape and has two transparent holes 4 arranged at an interval narrower than the pupil diameter, which is disposed immediately in front of the target eye E.

In the illustrated example, in the cylindrical eyepiece body 1, a thick eyepiece portion 2 with a large diameter has a light shielding plate 3 disposed in the opening located beside the observer's eye E. The opening next to the optotype is an open cylindrical light shielding part 5 with a small diameter. Further, the upper and lower edges or the left and right edges of the circular eyepiece portion 2 are formed with chamfered edges 6 that are substantially parallel to each other. The chamfered edge 6 is arranged in the front so that it can be held in the correct position with the hands and fingers in correspondence with the left-right direction or the up-down direction.

The two light-transmitting holes 4 formed in the light-shielding plate 3 are arranged close to each other to form a pair, and are formed, for example, in a circular shape, an elliptical shape, an elliptical shape, or a slit shape. When an observer looks into the optotype through the light-transmitting holes 4 and gradually approaches the eye E from a position slightly away from the eye E, the adjacent portions of the two light-transmitting holes 4 located far apart from each other become visible. The shape of the light-transmitting hole 4 is not limited to the above-mentioned shape example, as long as it gradually becomes visible in an overlapping manner, and the optotype can be seen through the light-transmitting hole 4 in the overlapped portion.

As shown in FIG. 3, the light shielding plate 3 may be circular (see FIGS. 3A and 3B) or rectangular (see FIGS. 3C and 3D), and is not limited to the shape. .

In addition, to specifically explain the shape, size, and distance between the transparent holes 4, in the case of circular shapes arranged in the left and right direction as shown in FIGS. 3(A) and 3(B), For example, the diameter of the transparent hole 4 is about 1.0 to 2.5 mm, the mutual interval is about 0.5 to 2.5 mm, and similarly, in the case of a vertically long slit shape, the left and right width is about 1.0 mm, for example. The height (length) is approximately 3.0 to 7.0 mm, and the mutual spacing is approximately 0.5 to 2.5 mm. Of course, without being limited to these, the shape, size, mutual spacing, etc. can be changed as appropriate as long as the above appearance is possible.

The light shielding plate 3 can also be configured to be rotatable within the eyepiece 2 by a rotation mechanism 10 provided in the eyepiece 2. For example, as shown in FIG. 8, the rotation mechanism 10 stores the circular light shielding plate 3 by rotatably fitting the circumferential edge of the circular light shielding plate 3 into a circumferential guide groove 11 formed in the eyepiece portion 2. At the same time, a guide slit 12 communicating with the guide groove 11 is formed on the outer periphery of the eyepiece 2, and an operation piece 13 formed to protrude outside the eyepiece 2 through the guide slit 12 is attached to the light shielding plate 3. In this way, the light shielding plate 3 can be rotated by rotating the operating piece 13 without rotating the eyepiece body 1 itself, and can be effectively used, for example, to determine the presence or absence of astigmatism.

Further, by displaying a scale indicating the rotation angle on the rotation mechanism 10, it can be useful for determining the degree of astigmatism.

Note that the eyepiece body 1 has, for example, an outer diameter of the eyepiece part 2 of about 40 mm and an inner diameter of about 25 mm, and an outer diameter of the light shielding plate 3 of about 25 mm, so that it can be forcibly fitted into the eyepiece part 2. By configuring the light shielding part 5 connected to the eyepiece part 2 to have an outer diameter of about 20 mm and a length of about 10 mm, a compact outer shape can be achieved. Moreover, since it is not bulky and easy to carry, it can be used as a self-awareness device that can be used to constantly verify by oneself and to determine the presence or absence of an abnormality and the degree of the abnormality. Not only that, but children can easily handle it as if it were a toy, making it possible to detect abnormalities at an early stage and provide appropriate treatment.

Next, when looking at the optotype using the science teaching materials of this invention, the way the optotype is seen by the observer and the subject to determine the difference in the focal position by themselves is as follows. .

First, the eyepiece main body 1 is placed in front of the eye E to be examined, with the eyepiece 2 facing inward, and the eyepiece is brought close to the eye E while viewing an optotype, for example, the letter "A", through the transparent hole 4. At this time, the fundus image is a fusion of left and right or upper and lower images (the drawing shows the case of translucent holes 4 arranged along the left and right direction, and the same applies hereinafter), and at this time, the two translucent In the portion dividing the light hole, the two light-transmitting holes 4 are overlapped with priority, and the overlapped center is recognized as a visual space surrounded by a circular arc (see FIG. 5).

Then, the refraction state can be determined based on the difference in images when viewing the optotype between the overlapping surrounding area at the center created by looking into the eyepiece body 1 and the left and right areas. In fact, if there is a refractive error, there will be a difference in sharpness and size of the index seen in the central region within the visual field when looking into the eyepiece body 1.

The focal position can be determined by the difference in the appearance of specific indicators, and it is possible to determine whether the focal point is in front of the retina (myopia), behind (hyperopia), or in different meridians (astigmatism). be. The overlapping ranges of the visual field images passing through the two transparent holes 4 are different, and an example of how they look is as follows.

As shown in Figure 6(A), the visual field image visible in the overlapping part is the same as that of the left and right parts, and the visual field image of the boundary part is one continuous image with the visual field images of the left and right parts of the overlapped part. If there is no change in the overall continuous visual field image, the observer's eye E is determined to be on the retina (emmetropia). In other words, since the light is focused on the retina, there is no difference in visibility (sharpness) between the overlapping part and the left and right parts (see FIG. 4).

As shown in FIGS. 6(B) and (C), due to the pinhole effect caused by the two transparent holes 4, the visual field image in the central part has lower clarity than the visual field images in the left and right parts, and In the case of myopia (myopia), the overlap becomes smaller and narrower. In other words, the strength or weakness of the deviation is determined based on the size of the overlapping portion. In other words, because the focus is focused in front of the retina, the overlap area at the center is narrower than in epiretinal (emmetropic) eyes, the visual field image is also smaller, and visibility deteriorates, and as the intensity increases, the overlap area becomes darker and narrower. As a result, visibility becomes worse (see Figure 4).

As shown in Fig. 6 (D), if the visual field image in the overlapping part in the center is clear, but the visual field image in the left and right parts is unclear and vague, (farsightedness). Depending on the magnitude of the overlap between the boundary parts, if it is small, it is determined that the degree of backward (hyperopia) is weak, and if it is large, it is determined that the degree of backward (hyperopia) is strong. In other words, in the case of backward vision (hyperopia), the field of vision is focused behind the retina, so the visual field image is slightly larger than on the retina (emmetropia), and the visibility of the left and right parts is worse than the overlapping part, and the brightness is also reduced. (See Figure 4).

Further, by using the light shielding plate 3 having the slit-shaped light-transmitting holes 4, it is also possible to determine the presence or absence of meridian difference (astigmatism). For example, a light shielding plate 3 having two transparent holes 4 arranged along the horizontal direction is rotated so that the transparent holes 4 are aligned in the vertical direction. If there is a difference in the sharpness of the visual field images, it is determined that there is a meridian difference (astigmatism). At this time, even though the visual field image in the overlapping area looks the same as on the retina (emmetropia), in front (myopia), and behind (hyperopia), there is a difference in sharpness depending on the angle when the light shielding plate 3 is rotated. This makes it possible to find locations with good and poor clarity and estimate the meridian axis (astigmatism). That is, in an astigmatic eye, the visibility (sharpness) of the overlapping part and the left and right parts thereof changes depending on the direction of the optotype consisting of the meridian to be measured. By finding its clear position, the axiality can also be estimated.

As shown in FIGS. 5 and 6, the overlapping portion when viewing the optotype through the transparent hole 4 varies depending on the degree of refractive error, and In the case of a refractive error, the image is perceived as extremely thin, and in the case of refractive error, it is perceived as darker.The range of the overlapping portion changes depending on the degree of refraction, and its sharpness also changes.

In addition, in FIG. 7, when viewing one optotype through the light-transmitting hole 4 of the light-shielding plate 3, regardless of the position of the focal point of the observer, the light-shielding plate is When 3 is moved slightly in the left and right direction (if the transparent holes 4 are arranged above and below, it is moved in the up and down direction), the visual target that is fixated appears to move to the right or left area. . At this time, it does not move regardless of the movement of the light shielding plate 3, and depending on whether it moves in the same direction (accompanying) or in the opposite direction (retrograde), it is placed on the retina, in front of the focal point (myopia), or behind the focal point (hyperopia). ), it becomes possible to determine the presence or absence of refractive error.

In addition, in this FIG. 7, the movement of the optotype when the light shielding plate 3 is moved is shown together with a mock diagram of the eye E showing the focal position (emmetropia, myopia, farsightedness) of the incident light that has passed through the transparent hole 4 of the light shielding plate 3. are shown in correspondence with each other.

On the retina (emmetropia), the visual field image of the optotype that can be seen in the overlapping area does not move even if the light shielding plate 3 moves, and this also causes the visual field image of the optotype to be visible on the retina (emmetropia). It can be determined that

Here, while gazing at the optotype visible at the overlapping portion position through the light-transmitting hole 4 of the light-shielding plate 3, when moving the light-shielding plate 3 or the eyepiece body 1 itself in the horizontal or vertical direction, Alternatively, the situation of refractive error when viewed retrogradely will be explained as follows by assuming that the light-shielding plate 3 has transparent holes 4 arranged on the left and right and moves from side to side.

Table 1 below summarizes the visual appearance and the movement of the visible optotype due to the difference in focal position for each focal position (emmetropia, myopia, hyperopia).

In addition, in the case of meridian difference (astigmatism), after confirming the focal position (emmetropia, nearsightedness, farsightedness) by observing through the two transparent holes 4, the visibility can be confirmed by rotating the light shielding plate 3 by 90 degrees and observing. The approximate degree of astigmatism in the meridian difference (astigmatism) can be determined by the difference in direction.

Further, as shown in FIG. 7, to explain the above content in detail, in the case of on the retina (emmetropia), even when shielded, the visual field image is formed on the retina of the eye E, so the light shielding plate 3 The visual field image that is visible does not move even when the image is moved.

In the case of near-focus (myopia), even if it is shielded, the visual field image will be formed at a position that does not reach the retina of the eye E, and an inverted and vague visual field image will be generated on the retina, so the light shielding plate 3 etc. The visual field image that is visible due to the movement of the light shielding plate 3 moves in the opposite direction to the movement direction of the light shielding plate 3 due to the intersecting nature of the incident light. In the case of intensity, the visual field image generated on the retina is also significantly shifted due to chiasmability, so the retrograde travel distance also becomes large.

In the case of backward (hyperopia), even if shielded, the visual field image will be formed at the rear position beyond the retina of the eye E, and a similar vague visual field image will be generated on the retina. The visual field image that is visible due to the movement follows the moving direction of the light shielding plate 3 due to the synchronous nature of the incident light. In the case of intensity, the visual field image generated on the retina is also significantly shifted due to the concurrency, so the travel distance of the concomitant movement also increases.

E...Eye 1...Eyepiece body 2...Eyepiece 3...Light blocking plate 4...Transparent hole 5...Light blocking part 6...Chamfered edge 10...Rotation mechanism 11...Guiding groove 12...Guiding slit 13...Operation piece

Claims (6)

The eyepiece body, which is formed in a cylindrical shape and is placed just in front of the observer's eyes, is equipped with an eyepiece part equipped with a light-shielding plate in which two light-transmitting holes are bored at an interval narrower than the diameter of the pupil; A science teaching material for optical learning characterized by having a cylindrical light-shielding part placed in front of the eye. 2. The optical learning science teaching material according to claim 1, wherein the eyepiece has a circular shape, and at least one of the upper and lower edges or the left and right edges thereof is provided with chamfered edges that are substantially parallel to each other. 2. The science teaching material for optical learning according to claim 1, wherein the transparent holes have a circular shape, a diameter of 1.0 to 2.5 mm, and a mutual interval of 0.5 to 2.5 mm. According to claim 1, the light transmitting hole is in the shape of a slit, with a horizontal width of 1.0 to 2.5 mm, a length of 3.0 to 7.0 mm, and a mutual interval of 0.5 to 2.5 mm. Science teaching materials for optics learning. 2. The optical learning science teaching material according to claim 1, wherein the eyepiece section is provided with a rotation mechanism for rotating the light shielding plate. The rotation mechanism stores the light shielding plate by rotatably fitting the peripheral edge of the light shielding plate into a circumferential guide groove formed in the eyepiece, and also inserts a guide slit communicating with the guide groove into the outer circumference of the eyepiece. 6. The science teaching material for optical learning according to claim 5, further comprising an operation piece formed on the light-shielding plate so as to protrude outside the eyepiece through a guide slit.

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