Visual training zoom glasses

Abstract

The utility model discloses a pair of visual training zoom glasses, which comprises glasses lenses and a linear motion mechanism, the glasses lenses comprise a positive focal power lens unit and a negative focal power lens unit, and the sum of the focal power of the positive focal power lens unit and the negative focal power lens unit is negative; the linear motion mechanism is used for driving the positive focal power lens unit and / or the negative focal power lens unit to move along the optical axis, so that the distance t between the positive focal power lens unit and the negative focal power lens unit is adjusted, and the total focal power phi of the glasses lens is changed from the negative focal power to the positive focal power. According to the zoom glasses for visual training, the lenses are formed by the positive-focal-power lens units and the negative-focal-power lens units, at least one lens unit is driven by the linear motion mechanism to move in the optical axis direction, the total focal power of the lenses of the glasses is changed, the structure is stable, control is easy, the relative movement distance of the two lens units is small, and the visual training effect is good. And the consistency of the overall focal power in the zooming range is better.

Description

Technical Field

[0001] The utility model relates to a pair of zoom glasses for vision training. Background Art

[0002] Eye health is an integral part of the overall welfare of citizens and has a profound impact on the quality of life, health status and sustainable development of society. Currently, myopia has become a major public health challenge worldwide. It is predicted that by 2050, the number of myopic people in the world will surge to about 4.758 billion, accounting for 49.8% of the world's total population. Studies have shown that the incidence of myopia shows different characteristics in different regions of the world, and the incidence in Asia is significantly higher than that in Africa and Europe and the United States.

[0003] The development of myopia is progressive, gradually getting worse with age, and may develop into moderate to high myopia, or even evolve into pathological myopia. The earlier myopia occurs, the greater the risk of developing high myopia, pathological myopia, or even blindness in the future. Visual impairment has a negative impact on personal health, well-being, and economic development, such as reduced education and employment opportunities, social isolation, and reduced life expectancy. These problems not only reduce the quality of life of patients, but also pose a serious obstacle to individual, family, and social progress. Therefore, preventing myopia in children and its development and controlling the rate of myopia growth are urgent tasks at present.

[0004] One of the main causes of myopia in children is that long-term close-range visual activities cause the ciliary muscle to be constantly tense and lack relaxation, which in turn weakens the ciliary muscle's ability to stretch and causes it to lose its relaxation function. Therefore, improving the regulatory function of the ciliary muscle is a key strategy to prevent and alleviate the formation of myopia. For groups such as teenagers whose eyeball structures are not yet mature, especially those who are prone to functional myopia, a more scientific method is to restore vision through special eye muscle training. Such training requires customizing the appropriate lens power according to each patient's specific eye condition (such as corneal thickness and curvature). However, in different environments, the human eye's perception of vision will be different, so a pair of glasses that can adapt to the needs of variable focal lengths is needed in different viewing distances and environments. This places higher demands on the design of glasses, that is, not only to ensure the accuracy of vision correction, but also to provide sufficient adaptability to meet the changing vision needs in daily life. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a kind of vision training zoom glasses.

[0006] In order to achieve the above technical objectives, the utility model adopts the following technical solutions:

[0007] A vision training zoom glasses, comprising glasses lenses and a linear motion mechanism, wherein:

[0008] The spectacle lens comprises at least a positive power lens unit and a negative power lens unit, the sum of the power of the positive power lens unit and the power of the negative power lens unit is negative; the axis of the positive power lens unit coincides with the axis of the negative power lens unit and coincides with the optical axis of the spectacle lens;

[0009] The linear motion mechanism is used to drive the positive optical power lens unit and / or the negative optical power lens unit to move along the optical axis, thereby adjusting the distance t between the positive optical power lens unit and the negative optical power lens unit, t is always greater than 0, so that the total optical power Φ of the eyeglass lens can be changed from negative optical power to positive optical power.

[0010] Preferably, the sum of the optical powers of the positive optical power lens unit and the negative optical power lens unit is no more than -2D.

[0011] Preferably, the focal power of the positive power lens unit ranges from 17D to 47D; and the focal power of the negative power lens unit ranges from -56D to -20D.

[0012] Preferably, the focal length of the positive power lens unit ranges from 17D to 30D; and the focal length of the negative power lens unit ranges from -33D to -20D.

[0013] Preferably, the positive power lens unit and the negative power lens unit are respectively selected from any one of a single lens, a positive-negative cemented lens or a lens group;

[0014] The surface shape of each optical surface in the positive power lens unit and the negative power lens unit is described by a spherical surface, an aspherical surface, a Fresnel surface or a free-form surface.

[0015] Preferably, the maximum distance T between the positive power lens unit and the negative power lens unit is max Not more than 15mm; and the maximum distance T max and the minimum distance T min The difference between max -T min ≤10mm.

[0016] Preferably, the eyeglass lens also includes an auxiliary lens unit, which is located at the outermost side of the eyeglass lens and is arranged close to the lens unit with adjustable position; the position of the auxiliary lens unit is fixed, and the axis of the auxiliary lens unit coincides with the optical axis of the eyeglass lens; the optical focal length φ3 of the auxiliary lens unit satisfies: |φ3|≤2D.

[0017] Preferably, the eyeglass lens further comprises an auxiliary lens unit, wherein the auxiliary lens unit is located at the outermost side of the eyeglass lens, the position of the auxiliary lens unit is fixed, the axis of the auxiliary lens unit coincides with the optical axis of the eyeglass lens, and the optical focal length φ3 of the auxiliary lens unit is determined according to the user's vision correction degree.

[0018] Preferably, the total optical power Φ of the spectacle lens varies in the range of: -5D≤Φ≤+5D.

[0019] Preferably, the eyeglass lens has an exit pupil distance of not less than 15 mm, an exit pupil diameter of not less than 4 mm, and a field of view angle of not less than 50°.

[0020] The utility model discloses a vision training zoom glasses, comprising a glasses lens and a linear motion mechanism, wherein the glasses lens at least comprises a positive focal power lens unit and a negative focal power lens unit, and the sum of the focal powers of the positive focal power lens unit and the negative focal power lens unit is negative; at least one of the positive focal power lens unit and the negative focal power lens unit is driven to move along the optical axis by the linear motion mechanism, and the distance between the two lens units is changed, so as to realize the change of the total focal power of the lens from negative to positive. The above-mentioned vision training zoom glasses have a function of adjusting the focal power change; wearing the vision training zoom glasses, one can read books, do homework or entertain at a close distance, and at the same time, perform the contraction and relaxation training of the ciliary muscle, which can effectively exercise the ciliary muscle, put the eyes in a state of motion rather than tension and stillness, and help to fundamentally prevent or reduce the occurrence of myopia.

[0021] Compared with liquid variable focus lenses that require control of the curvature of the liquid surface, or Alvarez-type zoom lenses that achieve zooming through vertical displacement, the above-mentioned vision training zoom glasses have a stable structure, are easy to control, have a small relative movement distance between the two lens units, and have better consistency in the overall optical focal length within the zoom range. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of an adjustment method of the vision training zoom glasses in the first embodiment;

[0023] Figure 2 is a schematic diagram of another adjustment method of the vision training varifocal glasses in the first embodiment;

[0024] Figure 3A and Figure 3B is a schematic diagram of two relative positions of an example of vision training variable focus glasses provided by the first embodiment;

[0025] Figure 4 is a schematic diagram of an adjustment method of the vision training varifocal glasses in the second embodiment;

[0026] Figure 5is a schematic diagram of an adjustment method of the vision training zoom glasses in the third embodiment;

[0027] Figure 6 is a schematic diagram of another adjustment method of the vision training varifocal glasses in the third embodiment;

[0028] Figure 7 is a schematic diagram of an adjustment method of the vision training varifocal glasses in the fourth embodiment;

[0029] Fig. 8A and Figure 8B 1 is a schematic diagram of two relative positions of an example of vision training variable focus glasses provided in the fourth embodiment. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] The vision training zoom glasses provided by the utility model include glasses lenses and a linear motion mechanism, wherein the glasses lenses include at least two lens units, one of which has a positive optical power characteristic, called a positive optical power lens unit, and the other lens unit has a negative optical power characteristic, called a negative optical power lens unit, and the sum of the optical powers of the two lens units is negative; at least one of the positive optical power lens unit and the negative optical power lens unit is driven to move along the optical axis direction by the linear motion mechanism to change the distance between the two lens units, thereby realizing the change of the total optical power of the lens from negative to positive. The zoom glasses solution provided by the utility model allows the glasses to provide the required zoom effect while maintaining a relatively thin lens thickness through precise position control of each lens unit. The vision training zoom glasses composed of multiple lens units have a simple and stable structure, and the zoom process is easy to control. In addition, they have better imaging quality for ambient light passing through the lenses, ensure a clear visual experience in the entire field of view, and the optical power is consistent in the entire field of view, which is convenient for the wearer's actual operation and use.

[0032] The frame glasses including such spectacle lenses use at least two optical elements to form the positive power lens unit and the negative power lens unit; the axis of the positive power lens unit coincides with the axis of the negative power lens unit and coincides with the optical axis of the spectacle lenses; at least one of the lens units is moved along the optical axis by a linear motion mechanism (such as a linear displacement motor) so that the two lens units produce axial displacement. The linear motion mechanism can drive only a single lens unit to move, or can simultaneously drive the two lens units to move relative to each other at different speeds or directions.

[0033] The distance t between the two lens units can be minand T max The distance t between the two lens units is the minimum value T. min When the two lens units are located at the first relative position, the total focal length of the eyeglass lens is the minimum total focal length Φ min , Φ min is negative; when the distance t between the two lens units is the maximum value T max When the two lens units are located at the second relative position, the total focal length of the eyeglass lens is the maximum total focal length Φ max , Φ max Is positive.

[0034] When using the above-mentioned spectacle lenses to construct glasses, in order to reduce the displacement during the zooming process to control the total length of the glasses in the visual axis direction (i.e., the thickness of the glasses), the maximum value of t T max Not more than 15 mm, and, in order to avoid collision between the two lens units during actual relative displacement, the minimum value of t is T min Not less than 0.1 mm. Preferably, T max -T min ≤10mm. The thickness of the glasses should be controlled within the range of no more than 50mm, preferably, the thickness of the glasses should not exceed 30mm.

[0035] In order to achieve the purpose of vision training, the total focal power Φ of the eyeglass lens needs to meet a certain focal power adjustment range, for example, the focal power range is -5D to +5D, so as to meet the needs of human eye ciliary muscle training. In actual use, each training can use the entire range of the above adjustment range or only use a certain interval from negative focal power to positive focal power for training.

[0036] In the above-mentioned eyeglass lens, the focal power φ1 of the positive power lens unit has a value range of [17D, 47D], and the focal power φ2 of the negative power lens unit has a value range of [-56D, -20D]. The sum of the focal powers of the two lens units is less than 0. Preferably, the sum of the focal powers of the two lens units is not greater than -2D, for example, the sum is -3D, -4D, -5D, -6D, etc., and the total focal power Φ of the eyeglass lens composed of the two lens units has a value in the range of -5D to +5D.

[0037] The positive power lens unit and the negative power lens unit can be a single lens, a positive-negative cemented lens or a lens group. The surface shape of each optical surface in the positive power lens unit and the negative power lens unit is described by a spherical surface, an aspherical surface, a Fresnel surface or a free-form surface. By adjusting the surface shape parameters of the positive power lens unit and the negative power lens unit, the imaging quality of the spectacle lens for the ambient light passing through the lens is optimized.

[0038] The positive focal power lens unit can be a biconvex lens, a plano-convex lens or a meniscus positive lens, and the center thickness range and edge thickness range of the positive focal power lens unit are 0.5mm to 2mm. The negative focal power lens unit can be a biconcave lens, a plano-concave lens or a meniscus negative lens, and the center thickness range and edge thickness range of the negative focal power lens unit are 0.5mm to 2mm.

[0039] When actually designing eyeglass lenses, the positive power lens unit can be arranged close to the human eye relative to the negative power lens unit, or can be arranged far away from the human eye relative to the negative power lens unit. When the negative power lens unit is close to one side of the human eye, the lens diameter of the negative power lens unit is not less than 20 mm, and the lens diameter of the positive power lens unit is not less than 30 mm; the lens diameter of the positive power lens unit is larger than the lens diameter of the negative power lens unit. When the positive power lens unit is close to one side of the human eye, the lens diameter of the negative power lens unit is not less than 20 mm, and the lens diameter of the positive power lens unit is not less than 20 mm, and the lens diameter of the positive power lens unit is close to the lens diameter of the negative power lens unit.

[0040] At the same time, the exit pupil distance of the above-mentioned glasses lenses is not less than 15mm, the exit pupil diameter is not less than 4mm, and the field of view angle is not less than 50°, so as to meet the daily wearing needs of the human eye.

[0041] First embodiment

[0042] like Figure 1 and Figure 2 As shown, the above-mentioned eyeglass lens with adjustable optical power is constructed by an ideal thin lens; it includes a positive optical power lens unit 101 and a negative optical power lens unit 102, the positive optical power lens unit 101 and the negative optical power lens unit 102 are coaxial, the negative optical power lens unit 102 is arranged close to the position 100 where the human eye is located, and the positive optical power lens unit 101 is arranged away from the position 100 where the human eye is located. Figure 1 As shown, the positive power lens unit 101 keeps a fixed position, and the negative power lens unit 102 is moved relative to the positive power lens unit 101; Figure 2 As shown, the position of the negative optical power lens unit 102 is kept fixed, and the position of the positive optical power lens unit 101 is moved relative to the negative optical power lens unit 102.

[0043] by Figure 1As an example, the positive power lens unit 101 keeps its position unchanged, and the linear motor drives the negative power lens unit 102 to make a linear reciprocating motion along the optical axis on the left side of the positive power lens unit 101. The distance t between the positive power lens unit 101 and the negative power lens unit 102 varies within a range of T min ~T max When the positive power lens unit 101 and the negative power lens unit 102 are located at the first relative position, that is, t=T min When the total optical power of the glasses is Φ min When the positive power lens unit 101 and the negative power lens unit 102 are located at the second relative position, that is, t = T max When the total optical power of the glasses is Φ max Among them, in the second relative position, the negative power lens unit 102 closer to the human eye is located at the position closest to the human eye, and the negative power lens unit 102 should maintain a certain distance d from the human eye, d is not less than 15mm (when the surface close to the human eye is concave, the requirement of the exit pupil distance can be appropriately relaxed, and the value range of d is d≥12mm), so as to ensure that the negative power lens unit does not collide with the user's eyelashes or vision correction glasses.

[0044] exist Figure 2 In the embodiment shown, the negative power lens unit 102 remains relatively stationary, and the linear motor drives the positive power lens unit 101 to perform linear reciprocating motion along the optical axis on the right side of the negative power lens unit 102. The distance t between the positive power lens unit 101 and the negative power lens unit 102 varies within a range of T. min ~T max When the positive power lens unit 101 and the negative power lens unit 102 are located at the first relative position, that is, t=T min When the total optical power of the glasses is Φ min When the positive power lens unit 101 and the negative power lens unit 102 are located at the second relative position, that is, t = T max When the total optical power of the glasses is Φ max .

[0045] In this embodiment, the focal length of the positive power lens unit 101 is φ1, and the focal length of the negative power lens unit 102 is φ2. Satisfies: The formula for calculating the total optical power of eyeglass lenses is: Φ=φ1+φ2-t×φ1×φ2.

[0046] Among them, the value range of the optical focal length φ1 of the positive optical focal length lens unit 101 satisfies: 17D~47D; the value range of the optical focal length φ2 of the negative optical focal length lens unit satisfies: -56D~-20D; by changing the distance between the positive optical focal length lens unit 101 and the negative optical focal length lens unit 102, the total optical focal length of the eyeglass lens can be changed in the range of -5D to +5D.

[0047] In order to reduce the thickness of the lens unit, the focal length of the two lens units can be selected within a smaller range; for example, the focal length of the positive focal length lens unit 101 is 17D to 30D, and the focal length of the negative focal length lens unit 102 is -33D to -20D. However, when using lens units with smaller focal lengths to construct eyeglass lenses, in order to achieve the same total focal length range adjustment, the distance between the two lens units needs to change significantly. On the contrary, when the focal length of the two lens units is selected within a larger range, at this time, in order to achieve the same total focal length range adjustment, the distance change between the two lens units can be reduced. Therefore, in actual use, the overall thickness of the glasses, the focal length of a single lens unit, and the surface design of each lens unit should be comprehensively considered to obtain a better perspective imaging effect.

[0048] The following is an example of adjusting the optical power of eyeglass lenses using several specific lens combinations.

[0049] Table 1: Example of the combination of the optical power of the two lens units in the first embodiment

[0050]

[0051]

[0052] It can be seen from the above data that according to the above eyeglass lens set of the utility model, a larger optical focal length zoom range can be obtained with a relatively small axial movement distance, which is beneficial to the manufacture and control of focusing glasses.

[0053] like Figure 3A and Figure 3B The figure shows a specific lens unit example provided by the first embodiment, wherein the positive power lens unit 101 is implemented by a positive lens, and the negative power lens unit 102 is implemented by a negative lens. The positive power lens unit 101 and the negative power lens unit 102 are meniscus lenses respectively.

[0054] The positive power lens unit 101 and the negative power lens unit 102 respectively use thin lenses, and the center thickness and edge thickness of the positive power lens unit 101 are controlled between 0.5 mm and 2 mm, and the center thickness and edge thickness of the negative power lens unit 102 are controlled between 0.5 mm and 2 mm. The lens diameter of the positive power lens unit 101 is not less than 30 mm, and the lens diameter of the negative power lens unit is not less than 20 mm.

[0055] Second embodiment

[0056] The second embodiment is an improvement of the first embodiment, wherein, in order to maintain the overall appearance of the glasses, an auxiliary lens unit 103 is provided in the glasses lens, so that the lens unit (such as Figure 1 The negative power lens unit 102 shown and Figure 2 The positive focal length lens unit 101 and its power mechanism are encapsulated inside the glasses, and the auxiliary lens unit 103 is located at the outermost side of the glasses lens and is close to the position-adjustable lens unit; the position of the auxiliary lens unit is fixed, and the axis of the auxiliary lens unit coincides with the optical axis of the glasses lens.

[0057] In some cases, the auxiliary lens unit 103 can be a lens of equal thickness without optical power, or a lens unit with small optical power; the optical power of the auxiliary lens unit 103 can be positive or negative, and the absolute value |φ3|≤2D. The use of the auxiliary lens unit 103 is based on the premise that the total optical power variation range of the eyeglass lens is not changed, that is, the sum of the optical powers of the positive optical power lens unit, the negative optical power lens unit and the negative lens unit should still be negative.

[0058] like Figure 4 The embodiment shown is for Figure 1 An improvement of the illustrated embodiment, wherein the positive optical power lens unit 101 is arranged at a position farthest from the human eye, the auxiliary lens unit 103 is arranged at a position closest to the human eye, the negative optical power lens unit 102 is arranged between the positive optical power lens unit 101 and the auxiliary lens unit 103, and the negative optical power lens unit 102 can move in the space between the positive optical power lens unit 101 and the auxiliary lens unit 103.

[0059] for Figure 2 The embodiment shown can also be improved similarly by arranging the auxiliary lens unit 103 at the position farthest from the human eye and encapsulating the positive focal length lens unit 101 between two fixed lenses.

[0060] Because the optical power of the auxiliary lens unit 103 is relatively small, the total optical power of the entire eyeglass lens is less affected, and the change of the total optical power from negative to positive can still be ensured. Of course, correspondingly, according to the value of the optical power of the auxiliary lens unit 103, the optical power values ​​of the positive optical power lens unit 101 and the negative optical power lens unit 102 will change in a small range.

[0061] The above three lens units are combined to form eyeglass lenses, which are suitable for normal human eyes and are used for vision training.

[0062] In addition, in other cases, the optical power value of the auxiliary lens unit 103 can also be determined according to the user's visual acuity to match the user's vision, so that people with ametropia can directly use the glasses to achieve vision training without wearing additional optical glasses. In this case, the total optical power of the positive optical power lens unit 101 and the negative optical power lens unit 102 meets the above vision training requirements.

[0063] Third embodiment

[0064] like Figure 5 and Figure 6 As shown, the above-mentioned adjustable optical power spectacle lens is constructed by an ideal thin lens; it includes a positive optical power lens unit 201 and a negative optical power lens unit 202, the positive optical power lens unit 201 and the negative optical power lens unit 202 are coaxial, and the positive optical power lens unit 201 is located on the left side of the negative optical power lens unit 202, and the positive optical power lens unit 201 is arranged close to the position 200 where the human eye is located. Among them, it can be as follows Figure 5 As shown, the position of the negative power lens unit 202 is kept fixed, and the position of the positive power lens unit 201 is moved relative to the negative power lens unit 202; or, as shown in FIG. Figure 6 As shown, the positive power lens unit 201 is kept at a fixed position, and the position of the negative power lens unit 202 is moved relative to the positive power lens unit 201.

[0065] Figure 5 A focal length adjustment method of this embodiment is provided, wherein the negative focal length lens unit 202 on the side away from the human eye remains stationary, and the linear motor drives the positive focal length lens unit 201 to perform linear reciprocating motion along the optical axis on the left side of the negative focal length lens unit 202, and the distance t between the positive focal length lens unit 201 and the negative focal length lens unit 202 varies within a range of T min ~T max When the positive power lens unit 201 and the negative power lens unit 202 are located at the first relative position, that is, t=T min When the total focal power of the eyeglass lens is Φ min When the positive power lens unit 201 and the negative power lens unit 202 are located at the second relative position, that is, t = Tmax When the total focal power of the eyeglass lens is Φ max In the second relative position, the positive power lens unit 201 which is closer to the human eye is located closest to the human eye, and a certain distance d needs to be maintained between the positive power lens unit 201 and the human eye, d being not less than 12 mm, to ensure that it does not collide with the user's eyelashes or vision correction glasses.

[0066] Figure 6 Another optical power adjustment method of this embodiment is given, wherein the positive optical power lens unit 201 keeps its position unchanged, and the linear motor drives the negative optical power lens unit 202 to make a linear reciprocating motion along the optical axis on the right side of the positive optical power lens unit 201, and the distance t between the positive optical power lens unit 201 and the negative optical power lens unit 202 varies within a range of T min ~T max When the positive power lens unit 201 and the negative power lens unit 202 are located at the first relative position, that is, t=T min When the total focal power is Φ min When the positive power lens unit 201 and the negative power lens unit 202 are located at the second relative position, that is, t = T max When the total focal power is Φ max .

[0067] In this embodiment, the designs of the positive power lens unit 201 and the negative power lens unit 202 are similar to those of the first embodiment. The positive power lens unit 201 and the negative power lens unit 202 are respectively single lenses, positive-negative cemented lenses or lens groups. The surface shapes of the optical surfaces in the positive power lens unit 201 and the negative power lens unit 202 are described by spherical surfaces, aspherical surfaces, Fresnel surfaces or free-form surfaces.

[0068] When the positive focal power lens unit 201 is a single lens, the positive focal power lens unit 201 can be a double convex lens, a plano-convex lens or a meniscus positive lens, wherein the center thickness range and edge thickness range of the positive focal power lens unit 201 are 0.5 mm to 2 mm, and the lens diameter of the positive focal power lens unit 201 is not less than 20 mm.

[0069] When the negative power lens unit 202 is a single lens, the negative power lens unit 202 is a biconcave lens, a plano-concave lens or a meniscus negative lens, wherein the center thickness range and edge thickness range of the negative power lens unit 202 are 0.5 mm to 2 mm, and the lens diameter of the negative power lens unit 202 is not less than 20 mm.

[0070] The following is an example of adjusting the optical power of eyeglass lenses using a specific lens combination.

[0071] Table 2 Example of the combination of the optical power of two lens units in the third embodiment

[0072]

[0073]

[0074] Among them, when t = T min =0.69mm,Φ min = -5D; when t = T max =7.67mm, Φ max =5D. The total focal power Φ of the glasses changes from -5D to +5D, and the two lens units only need to move Δt = T max -T min =6.98mm.

[0075] It can be seen from the above data that according to the above eyeglass lens set of the utility model, a relatively small axial moving distance can be used to obtain a larger focal power zoom range, which is beneficial to the manufacture and control of focusing glasses. When the product of the focal power of the two lens units is larger, the axial distance required to move in order to achieve a fixed range zoom is smaller.

[0076] Fourth embodiment

[0077] The fourth embodiment is an improvement of the third embodiment, wherein, in order to maintain the overall appearance of the glasses, an auxiliary lens unit 203 is provided in the glasses lens, so that the lens unit (such as Figure 5 The positive power lens unit 201 shown and Figure 6 The negative optical focal length lens unit 202 and its power mechanism are encapsulated inside the glasses, and the auxiliary lens unit 203 is located at the outermost side of the glasses lens and is close to the position-adjustable lens unit; the position of the auxiliary lens unit is fixed, and the axis of the auxiliary lens unit coincides with the optical axis of the glasses lens.

[0078] Similar to the second embodiment, in some cases, the auxiliary lens unit 203 can be a lens of equal thickness without optical power, or a lens unit with small optical power; the optical power of the auxiliary lens unit 203 can be positive or negative, and the absolute value |φ3|≤2D. The use of the auxiliary lens unit 203 is based on the premise that the optical power variation range of the overall lens is not changed, that is, the sum of the optical powers of the positive optical power lens unit, the negative optical power lens unit and the negative lens unit should still be negative.

[0079] like Figure 7 The embodiment shown is for Figure 5An improvement of the illustrated embodiment, wherein the negative optical power lens unit 202 is arranged at a position farthest from the human eye, the auxiliary lens unit 203 is arranged at a position closest to the human eye, the positive optical power lens unit 201 is arranged between the negative optical power lens unit 202 and the auxiliary lens unit 203, and the positive optical power lens unit 201 can move in the space between the negative optical power lens unit 202 and the auxiliary lens unit 203.

[0080] for Figure 6 The embodiment shown can also be improved similarly by arranging the auxiliary lens unit 203 at the position farthest from the human eye and encapsulating the negative optical power lens unit 202 between two fixed lenses.

[0081] Because the optical power of the auxiliary lens unit 203 is relatively small, the total optical power of the entire eyeglass lens is relatively small, and the change of the total optical power from negative to positive can still be ensured. Of course, correspondingly, according to the value of the optical power of the auxiliary lens unit 203, the optical power values ​​of the positive optical power lens unit 201 and the negative optical power lens unit 202 will change in a small range.

[0082] Fig. 8A and Figure 8B A specific design of the fourth embodiment is given, in which the auxiliary lens unit 203 uses a positive lens, the positive power lens unit 201 includes a positive lens, and the negative power lens unit 202 includes a negative lens. The lens diameters of the positive power lens unit 201 and the negative power lens unit 202 are almost equal, and are not less than 20 mm. The geometric center thickness and edge thickness of the positive power lens unit 201 are controlled between 0.5 mm and 2 mm, the geometric edge thickness and center thickness of the negative power lens unit 202 are maintained between 0.5 mm and 2 mm, and the geometric center thickness of the auxiliary lens unit 203 is also controlled between 0.5 mm and 2 mm.

[0083] The above embodiment only illustrates the addition of an auxiliary lens unit on the side close to the human eye when the lens unit close to the human eye is moved. Similarly, when the lens unit away from the human eye is moved, an auxiliary lens unit with a fixed position can also be set on the outermost side away from the human eye. At this time, the total optical focal length adjustment of the eyeglass lens can also be achieved by moving the lens unit located in the middle. The optical focal length of the auxiliary lens unit can be zero, positive, or negative, but its absolute value should still be no more than 2D, so as to avoid a large impact on the total optical focal length adjustment of the eyeglass lens.

[0084] Similarly, for people with ametropia, the optical power value of the auxiliary lens unit 103 can also be determined according to the user's visual acuity to match the user's vision, so that the glasses can be used directly to achieve vision training without wearing additional vision glasses. At this time, the total optical power of the positive power lens unit 101 and the negative power lens unit 102 meets the above vision training requirements.

[0085] In summary, the utility model provides a vision training zoom glasses, which are used to image ambient light; the glasses include a positive optical focal length lens unit, a negative optical focal length lens unit and a linear motion mechanism, and the linear motion mechanism is used to move at least one of the positive optical focal length lens unit and the negative optical focal length lens unit in the direction of the optical axis, so that the total optical focal length of the lens changes from negative optical focal length to positive optical focal length, and these lens units can be flexibly combined according to the requirements of optical design. This design allows the glasses to flexibly adjust the focal length according to the user's vision and specific application scenarios.

[0086] The present invention can be implemented in a variety of different forms and should not be construed as being limited to the various embodiments described herein. On the contrary, the provision of these embodiments is to fully and completely disclose the present invention and fully convey the concept of the present invention to those skilled in the art. In addition, the features in the various embodiments may also be combined in a manner different from that described, and the combined technical solutions are still within the scope of the present application.

Claims

1. A vision training varifocal glasses, characterized by: It includes a spectacle lens and a linear motion mechanism, wherein: The spectacle lens comprises at least a positive power lens unit and a negative power lens unit, the sum of the power of the positive power lens unit and the power of the negative power lens unit is negative; the axis of the positive power lens unit coincides with the axis of the negative power lens unit and coincides with the optical axis of the spectacle lens; The linear motion mechanism is used to drive the positive optical power lens unit and / or the negative optical power lens unit to move along the optical axis, thereby adjusting the distance t between the positive optical power lens unit and the negative optical power lens unit, t is always greater than 0, so that the total optical power Φ of the eyeglass lens can be changed from negative optical power to positive optical power.

2. The vision training varifocal glasses according to claim 1, characterized in that: The sum of the optical powers of the positive optical power lens unit and the negative optical power lens unit is no greater than -2D.

3. The vision training varifocal glasses according to claim 1 or 2, characterized in that: The focal length of the positive focal length lens unit ranges from 17D to 47D; The focal length of the negative focal length lens unit ranges from -56D to -20D.

4. The vision training varifocal glasses according to claim 1 or 2, characterized in that: The focal length of the positive focal length lens unit ranges from 17D to 30D; The focal length of the negative focal length lens unit ranges from -33D to -20D.

5. The vision training varifocal glasses according to claim 1, characterized in that: The positive power lens unit and the negative power lens unit are respectively selected from any one of a single lens, a positive-negative cemented lens or a lens group; The surface shape of each optical surface in the positive power lens unit and the negative power lens unit is described by a spherical surface, an aspherical surface, a Fresnel surface or a free-form surface.

6. The vision training varifocal glasses according to claim 1, characterized in that: The maximum distance T between the positive power lens unit and the negative power lens unit max Not more than 15mm; and the maximum distance T max and the minimum distance T min The difference between max -T min ≤10mm.

7. The vision training varifocal glasses according to claim 1, characterized in that: The eyeglass lens also includes an auxiliary lens unit, which is located at the outermost side of the eyeglass lens and is arranged close to a lens unit whose position can be adjusted; the position of the auxiliary lens unit is fixed, and the axis of the auxiliary lens unit coincides with the optical axis of the eyeglass lens; the optical focal length φ3 of the auxiliary lens unit satisfies: |φ3|≤2D.

8. The vision training varifocal glasses according to claim 1, characterized in that: The eyeglass lens also includes an auxiliary lens unit, which is located at the outermost side of the eyeglass lens. The position of the auxiliary lens unit is fixed, the axis of the auxiliary lens unit coincides with the optical axis of the eyeglass lens, and the optical focal length φ3 of the auxiliary lens unit is determined according to the user's vision correction degree.

9. The vision training varifocal glasses according to claim 1, characterized in that: The total optical power Φ of the spectacle lens varies in the range of: -5D≤Φ≤+5D.

10. The vision training varifocal glasses according to claim 1, characterized in that: The eyeglass lens has an exit pupil distance of not less than 15 mm, an exit pupil diameter of not less than 4 mm, and a field of view angle of not less than 50°.

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