Eye vision correction demonstration teaching aid

Abstract

The embodiment relates to an eye vision correction demonstration teaching aid which comprises a parallel light source, a lens for correcting vision and a first convex lens used as a crystalline lens, and is characterized by further comprising a cylinder and a fixing plate, a smoke generating assembly capable of generating smoke is arranged in the cylinder, the top end of the cylinder is provided with an upper end opening, and the upper end opening is provided with a lower end opening. A mark serving as a retina is arranged on the outer wall of the cylinder; the fixing plate is arranged in the barrel and located below the upper end opening, a through hole allowing parallel light to penetrate through is formed in the middle of the fixing plate, the first convex lens is arranged on the fixing plate, and the lens is detachably arranged above the first convex lens and located below the parallel light source. The vision problem demonstration instrument has the advantages that the cause of formation of vision problems and the correction result can be displayed, the whole experiment process is convenient to operate, less time is consumed, the change of a light path can be displayed due to the fact that the cylinder body is filled with smoke, and the experiment phenomenon is more obvious and clearer.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of teaching demonstration teaching aid, especially to an eye vision correction demonstration teaching aid. BACKGROUND

[0002] In the existing eye vision correction demonstration experiment, for example, the simulation experiment about the cause and correction of myopia is that a convex lens represents the lens of the eye, a light screen is used as the retina, a concave lens is placed in front of the convex lens as myopia glasses, the imaging distance is recorded when the concave lens is moved, and the conclusion that myopia is imaging before the retina and can be corrected by the concave lens is obtained.

[0003] For example, the utility model patent "Myopia and hyperopia demonstration device" with patent application number CN202021057449.9 (authorized announcement number CN213183246U) discloses a demonstration device, which is provided with a light source, a water convex lens and a light screen in sequence on a light holder, a movable sliding block is arranged between the light source and the water convex lens, and a convex lens or a concave lens is detachably arranged on the sliding block. However, this experiment has the disadvantages of complicated operation, unobvious experimental phenomenon and inability to present the change of light path in actual teaching. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem of the prior art, and provides an eye vision correction demonstration teaching aid which is convenient to operate and has obvious experimental phenomenon.

[0005] The utility model adopts the technical scheme that the technical problem is solved, and the utility model relates to an eye vision correction demonstration teaching aid which comprises a parallel light source, a lens for correcting vision and a first convex lens for acting as a lens, characterized in that a cylinder and a fixed plate are further arranged, the cylinder is internally provided with a smoke generating assembly capable of generating smoke, the cylinder is provided with an upper port at the top end, and a mark serving as a retina is arranged on the outer wall of the cylinder; the fixed plate is arranged in the cylinder and located below the upper port, the fixed plate is provided with a through hole capable of allowing parallel light to pass through the middle of the fixed plate, the first convex lens is arranged on the fixed plate, and the lens is detachably arranged above the first convex lens and below the parallel light source.

[0006] In order to demonstrate the correction of vision in different states by using the demonstration teaching aid, the lens comprises a first concave lens for correcting myopia and / or a second convex lens for correcting hyperopia.

[0007] In order to make the smoke fill the inside of the cylinder, a base is further arranged, the bottom of the cylinder is arranged above the base, and the smoke generating assembly is detachably arranged on the bottom of the cylinder.

[0008] The smoke generating assembly has various structures, and from the perspective of simple structure, the smoke generating assembly preferably comprises an asbestos net and a mosquito-repellent incense arranged above the asbestos net.

[0009] In order to facilitate the control of parallel light, the parallel light source is two parallel laser pointer stars.

[0010] In order to measure the focal length and facilitate reading, a scale for measuring the focal length is arranged on the side wall of the cylinder.

[0011] Compared with the prior art, the advantages of the eye vision correction demonstration teaching aid are that the fixing plate is arranged in the cylinder and below the upper port, the first convex lens serving as a lens is arranged on the fixing plate, parallel light is shot in, and the causes of vision problems can be demonstrated; then the lens for correcting vision is placed on the first convex lens, parallel light is shot in, and the correction result can be demonstrated; the whole experimental process is convenient to operate, time-consuming is less, and since the inside of the cylinder is full of smoke, the change of light path can be demonstrated, and the experimental phenomenon is more obvious and clear. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 Figure 1 is a structural schematic view of the eye vision correction demonstration teaching aid in the embodiment of the present application;

[0013] Figure 2 Figure 2 is a light path schematic view of myopia correction of the eye vision correction demonstration teaching aid in the embodiment of the present application;

[0014] Figure 3 Figure 3 is a light path schematic view of myopia formation of the eye vision correction demonstration teaching aid in the embodiment of the present application;

[0015] Figure 4 Figure 4 is a light path schematic view of hypermetropia correction of the eye vision correction demonstration teaching aid in the embodiment of the present application;

[0016] Figure 5 Figure 5 is a light path schematic view of hypermetropia formation of the eye vision correction demonstration teaching aid in the embodiment of the present application. DETAILED DESCRIPTION

[0017] The present application will be further described in detail below with reference to the embodiment of the drawings.

[0018] As shown in the drawings, Figures 1-5 the eye vision correction demonstration teaching aid in the embodiment includes a parallel light source 1, a first concave lens 2 for correcting myopia, a second convex lens 3 for correcting hypermetropia, a first convex lens serving as a lens, a cylinder 5, a fixing plate 6, a base 7, a smoke generating assembly 8, and a scale 9, wherein the first convex lens is a convex lens with different focal lengths when correcting myopia and hypermetropia, the first convex lens for correcting myopia can be marked as 4, and the first convex lens for correcting hypermetropia can be marked as 4a.

[0019] Two parallel laser pointer stars are used as the parallel light source 1, with a working voltage of 3.7 volts and an output power of 0.1 W. The laser pointer stars can be fixed by a rubber band, and each time the light is turned on for no more than 30 seconds.

[0020] In this embodiment, the cylinder 5 is a cylinder made of organic glass or a liquid internal pressure device, with an outer diameter of 11 cm, an inner diameter of about 10.5 cm, a height of about 45 cm, a hollow interior, a transparent side wall that can see the interior, a top end port 51 at the top end, and a bottom end port 53 at the bottom of the base 7.

[0021] In the cylinder, an annular fixing plate 6 for placing lenses of various specifications is provided 1 cm below the upper end port 51. The fixing plate 6 has a through hole 6a with a diameter of 4 cm in the middle, which allows parallel light to pass through, to avoid the influence of the teaching aid itself on the light. A circle of red markings 52 is provided on the outer wall 10 cm below the upper end port 51 as the retina. A scale 9 for measuring focal length is provided on the side wall of the cylinder 5, and the inner wall is lined with black background paper.

[0022] The cylinder 5 is detachably provided with a smoke generating assembly 8 that can generate smoke. The smoke generating assembly 8 includes an asbestos net 81 and a mosquito coil 82 above the asbestos net 81. The upper end port 51 is sealed with a lens, and after the mosquito coil 82 is lit, about 30 seconds later, the lens is removed, and the smoke escaping from the upper end port 51 is the full mark. After filling, the smoke generating assembly 8 can be removed, and at this time, the cylinder 5 is filled with smoke that acts as a medium and can display the light path. Then, the first convex lens is placed on the fixing plate 6, and the first concave lens 2 or the second convex lens 3 is detachably provided above the first convex lens and below the parallel light source 1, and the experiment begins.

[0023] The experimental method of this embodiment is as follows:

[0024] Myopia correction and causes: the first convex lens 4 with a focal length of 10 cm and a diameter of 4 cm is placed as a lens in the middle of the fixing plate 6, and a first concave lens 2 with a diameter of 10 cm is placed above the first convex lens 4 as a myopic lens. The parallel light is incident, and the image is formed on the red marked retina. As shown in Figure 2 , this is the state after the myopic eye is corrected; then the first concave lens 2 is removed, and the parallel light is incident, and the image is formed before the retina. As shown in Figure 3 , it can be shown that the myopic eye is imaged before the retina;

[0025] Hyperopia Correction and Causes: A first convex lens 4a with a focal length of 25cm and a diameter of 10cm is placed as the lens in the middle of the fixing plate 6. A second convex lens 3 with a focal length of 25cm and a diameter of 10cm is then placed above the first convex lens 4a to act as a hyperopia eyeglass. Parallel light enters, causing the image to be formed precisely on the retina marked in red. Specifically, as shown... Figure 4 As shown, this is the state after farsightedness correction; then the second convex lens 3 is removed, parallel light enters, and the image is formed behind the retina, specifically as follows. Figure 5 As shown, this illustrates that in farsightedness, the image is formed behind the retina.

[0026] The above experiment first corrected the visual defect, then removed the corrected lens to observe and compare the image distance, making the cause of the imaging immediately clear. This broke with convention and applied reverse thinking.

[0027] Meanwhile, in optics teaching, this demonstration tool can also be used to determine the focal length of a lens, demonstrate the effect of a lens on light, such as the converging effect of a convex lens on light and the diverging effect of a concave lens on light. It can also be used to explain the relationship between the convexity of a convex lens and its focal length, and can even demonstrate the optical paths of refracting and reflecting telescopes.

Claims

1. A visual acuity correction demonstration teaching aid, comprising a parallel light source (1), a lens for correcting visual acuity, and a first convex lens for serving as a lens, characterized in that: It also includes a cylindrical body (5) and a fixing plate (6). The cylindrical body (5) is provided with a smoke generating component (8) that can generate smoke. The top of the cylindrical body (5) has an upper port (51), and the outer wall of the cylindrical body (5) is provided with a mark (52) as a retina. The fixing plate (6) is located inside the cylindrical body (5) and below the upper port (51). The fixing plate (6) has a through hole (6a) in the middle that allows parallel light to pass through. The first convex lens is located on the fixing plate (6). The lens is detachably located above the first convex lens and below the parallel light source (1).

2. The visual acuity correction demonstration teaching aid according to claim 1, characterized in that: The lens includes a first concave lens (2) for correcting myopia and / or a second convex lens (3) for correcting hyperopia.

3. The visual acuity correction demonstration teaching aid according to claim 1, characterized in that: It also includes a base (7), the bottom of the cylinder (5) is located above the base (7), and the smoke generating component (8) is detachably located at the bottom of the cylinder (5).

4. The visual acuity correction demonstration teaching aid according to claim 3, characterized in that: The smoke generating component (8) includes an asbestos net (81) and a mosquito coil (82) disposed above the asbestos net (81).

5. The visual acuity correction demonstration teaching aid according to claim 1, characterized in that: The parallel light source (1) consists of two parallel laser pointers.

6. The visual acuity correction demonstration teaching aid according to claim 1, characterized in that: The cylinder (5) has a scale (9) on its side wall for measuring focal length.

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