A myopia prevention and control lens without shadow and steep defocus amount and a prevention and control device

Abstract

This invention relates to the field of optical lens technology, and more specifically, to a myopia control lens and device with a sudden change in defocus without shadow. The lens includes a lens body with a central region for imaging light onto the retina. A periphery of the optical region is configured to focus light within a 10°-20° range from the fovea of ​​the macula onto a defocus abrupt change region in front of or behind the retina. The defocus abrupt change region includes a lens array composed of multiple micro-structured lenses. A periphery of the defocus abrupt change region is configured to focus light beyond a 20° range from the fovea of ​​the macula onto a defocus gradual change region in front of or behind the retina. This invention employs a sudden change in defocus, with a rapid increase in defocus from the central optical region to the defocus abrupt change region, enhancing the defocus effect. The defocus amounts from the defocus abrupt change region to the defocus gradual change region are not fixed, achieving a dynamic defocus effect. This reduces the diameter of the microlenses, making them imperceptible to the naked eye and reducing visual interference.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and more specifically, to a myopia control lens and control device with shadowless abrupt change in defocus. Background Technology

[0002] Currently, the rate of poor vision among children and adolescents in my country is extremely high, and myopia has become the primary problem endangering their visual health. While traditional single-vision lenses ensure clear vision after correction, they cause peripheral image points to still fall behind the retina, continuing to stimulate the retina, leading to elongation of the eye axis and worsening of myopia. Therefore, ordinary single-vision glasses can only correct vision and cannot effectively control the development of myopia.

[0003] Currently, myopia control lenses on the market utilize the principle of reducing peripheral hyperopic defocus of the retina, which can slow down the growth of the eye axis and thus slow down the development of myopia. They are among the more effective control products in recent years.

[0004] There are currently three main types of popular myopia control lenses: I. Multi-zone positive optical defocusing technology (DIMS) multi-point defocusing lenses typically have a myopia defocusing amount between +3.00D and +5.00D. For example, a spectacle lens with patent publication number CN104678572B has several circular microlenses with a diameter of approximately 0.8-2mm arranged in different areas to form a second refractive zone. While visually recognizing the image formed by the first refractive force, the image obtained in front of the retina by the second refractive zone inhibits the progression of myopia. However, in actual product implementations of this spectacle lens, the diameter of the microlenses in the second refractive zone is only 1.00mm, which is visible to the naked eye and affects aesthetics and visual effect.

[0005] II. A ring-shaped defocusing lens using High Aspheric Lens Star Control Technology (HALT), such as the optical lens in patent publication number CN116601550A, is designed to be worn in front of a wearer's eye having at least one prescribed refractive power RX. The optical lens includes: a refractive region having a refractive power based on the wearer's eye's prescribed refractive power RX, and the refractive region at least including a central area of ​​the optical lens; and a plurality of optical elements having the optical function of not focusing the image onto the wearer's retina, wherein the optical elements are arranged based at least on the wearer's prescribed refractive power RX and the shape of the retina. In actual product implementations of this optical lens, although the defocusing region is designed according to the shape of the retina, the defocusing amount of the optical elements is fixed, failing to meet the characteristic that the required defocusing amount increases towards the periphery of the retina.

[0006] III. A ring-shaped microcylindrical defocus lens incorporating higher-order aberration perturbations, such as a spectacle lens with a ring-shaped toroidal surface microstructure on its surface, as described in patent application number 202010000666.2. This lens has multiple ring-shaped toroidal surface microstructures of different radii within a specific aperture range, arranged in a radial array with the lens's geometric center as the center. Each ring-shaped toroidal surface microstructure can generate relatively stable refractive power and higher-order aberrations. The theoretical basis for this lens's myopia control is that the higher-order aberration perturbations caused by irregular astigmatism help suppress axial elongation. However, in actual product implementation, although the actual structure may exhibit myopic defocus and astigmatic defocus, the theoretical myopia intervention effect for these two concepts is not addressed. Furthermore, the ring-shaped cylinder structure of this lens causes strong visual interference during actual wear, requiring a long adaptation time and affecting the wearing effect. Summary of the Invention

[0007] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0008] To at least partially solve the above problems, the present invention provides a myopia control lens with shadowless abrupt defocus, comprising a lens body, an optical zone in the central region of the lens body for imaging light onto the retina; a periphery of the optical zone for focusing light within a range of 10°-20° from the fovea of ​​the macula onto a defocus abrupt defocus zone in front of or behind the retina; the defocus abrupt defocus zone includes a lens array composed of multiple micro-structured lenses; a periphery of the defocus abrupt defocus zone for focusing light beyond 20° from the fovea of ​​the macula onto a defocus gradual defocus zone in front of or behind the retina, wherein the defocus amount of the gradual defocus zone is less than that of the abrupt defocus zone, and the defocus gradual defocus zone includes a multiple microlens array.

[0009] Furthermore, the optical area is a circular, elliptical, or regular polygonal region with a diameter of 4-10 mm.

[0010] Furthermore, the multiple microstructure lenses of the lens array in the defocus abrupt change region are arranged at intervals, closely arranged, or intersecting.

[0011] Furthermore, the shape of the microstructure lens is one or more combinations of a circle, ellipse, arc, bow, or regular polygon.

[0012] Furthermore, the microstructure lens in the defocus abrupt change region is a convex lens with a refractive power range of +0.50D to +20.00D or a concave lens with a refractive power range of -0.50D to -20.00D.

[0013] Furthermore, in the microlens array of the defocus gradient region, the microlens shape is one or more combinations of circular, elliptical, arc-shaped, bow-shaped, and regular polygonal shapes.

[0014] Furthermore, in the microlens array of the defocus gradient region, multiple microlenses are arranged alternately, closely, or intersectingly.

[0015] Furthermore, the microlenses in the defocus gradient region are convex lenses with a refractive power range of +0.50D to +10.00D or concave lenses with a refractive power range of -0.50D to -10.00D.

[0016] Furthermore, the refractive power of the microlens in the 20°-30° angle of view in the defocus gradient region is half that in the abrupt defocus region, and the refractive power of the microlens in the 30°-40° angle of view in the defocus gradient region is two-thirds that in the abrupt defocus region.

[0017] Furthermore, the diameter of the microlens in the abrupt defocusing region and the diameter of the microlens in the gradual defocusing region are both 0.01 mm to 0.5 mm.

[0018] Furthermore, the defocus abrupt change zone and the defocus gradual change zone are disposed on the front surface of the lens body, or on the rear surface of the lens body, or simultaneously on both the front and rear surfaces of the lens body.

[0019] Furthermore, the defocus abrupt change zone and the defocus gradual change zone of the lens body are processed using grayscale lithography or ultra-fine turning technology.

[0020] A protective device includes a wearing part equipped with a wearing strap and a lens as described in any of the above claims. A frame assembly is disposed within the wearing part. The frame assembly includes a frame body disposed within the wearing part. A bidirectional screw and a movable shaft are rotatably arranged side-by-side in a central groove of the frame body. Two opposing upper shaft seats are screwed onto the bidirectional screw. The two upper shaft seats are rotatably connected to the upper rotating shafts of two lens frames. Each of the two lens frames contains a lens body. The lower rotating shafts of the two lens frames are rotatably connected to two lower shaft seats. The two lower shaft seats are rotatably mounted on two worm gears. Each of the two worm gears is sleeved on the movable shaft. A protrusion in the central hole of each worm gear slides in a guide groove on the movable shaft. The two worm gears mesh with worm wheels on the two lower rotating shafts.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects: This invention discloses a myopia control lens with a sudden change in defocus, employing a sudden change in defocus design. The defocus amount increases sharply from the central optical zone to the defocus transition zone, enhancing the defocus effect. The defocus amount from the defocus transition zone to the defocus gradient zone is not fixed, achieving a dynamic defocus effect. This reduces the diameter of the microlens, making it imperceptible to the naked eye, reducing visual interference, achieving an invisible effect, and improving aesthetics and wearing comfort. It effectively solves the problems of strong visual interference from the microstructure of existing myopia control lenses, resulting in a long initial adaptation period, and the unstable control effect due to fixed defocus amount, thereby further achieving the purpose of inhibiting axial elongation and controlling the progression of myopia.

[0022] The advantages of this invention are: 1. This invention uses a small-diameter microstructure lens that is not visible to the naked eye, achieving an invisible effect, improving aesthetics and visual effect, reducing strong visual interference caused by existing defocus areas, improving comfort, and reducing adaptation time; 2. This invention references the effective defocusing amount of orthokeratology (OK) lenses and adopts a design that sharply increases the defocusing amount from the central optical zone to the defocusing zone, with a defocusing amount of up to ≥±8.00D, greatly improving the prevention and control effect; 3. In this invention, the defocus amount in the defocus gradient zone is not fixed, which is more in line with the peripheral morphology of the retina. The dynamic defocus effect is generated by the continuous change of the defocus amount in different areas, which is conducive to improving the tolerance of defocus amount and the stability of the control effect.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 A schematic diagram of each region of the myopia control lens with shadowless abrupt defocusing provided by the present invention; Figure 2 Schematic diagram of the microlens arrangement provided by the present invention Figure 1 ; Figure 3 Schematic diagram of the microlens arrangement provided by the present invention Figure 2 ; Figure 4 Schematic diagram of the microlens arrangement provided by the present invention Figure 3 ; Figure 5 This is a schematic diagram of a convex lens provided by the present invention; Figure 6 This is a schematic diagram of a concave lens provided by the present invention; Figure 7 A frontal view schematic diagram of the myopia control lens with shadowless abrupt defocusing provided by the present invention; Figure 8 This invention provides a beam imaging diagram of a myopia control lens with shadowless abrupt defocus when viewing a distant object, for Embodiment 1 of the present invention. Figure 9 This is a schematic diagram illustrating the change in refractive power from the center to the periphery of the myopia control lens with shadowless abrupt defocusing provided in Embodiment 1 of the present invention. Figure 10 This invention provides a beam imaging diagram of a myopia control lens with shadowless abrupt defocus when viewing a distant object, for Embodiment 2 of the present invention. Figure 11 This is a schematic diagram illustrating the change in refractive power from the center to the periphery of the myopia control lens with shadowless abrupt defocusing provided in Embodiment 2 of the present invention. Figure 12 This is a schematic diagram of the light spot projected onto a certain brand of myopia control lenses currently on the market. Figure 13 This is a schematic diagram of the light spot under projection without coating according to an embodiment of the present invention; Figure 14 This is a schematic diagram of the light spot projected after coating according to an embodiment of the present invention; Figure 15 This is a detection diagram of the refractive power of the microlens in an embodiment of the present invention; Figure 16 This is a schematic diagram of a first direction of a prevention and control device provided in an embodiment of the present invention; Figure 17 This is a schematic diagram of a second direction of a prevention and control device provided in an embodiment of the present invention; Figure 18 A cross-sectional view of a control device provided in an embodiment of the present invention; Figure 19 A schematic diagram of the wearing part in a first direction provided in an embodiment of the present invention; Figure 20 A schematic diagram of the second direction of the wearing part provided in an embodiment of the present invention; Figure 21 A partial schematic diagram of the wearing part provided in an embodiment of the present invention. Figure 1 ; Figure 22 A partial schematic diagram of the wearing part provided in an embodiment of the present invention. Figure 2 ; Figure 23 This is a schematic diagram of the frame assembly provided in an embodiment of the present invention in a first direction; Figure 24 This is a schematic diagram of the second direction of the eyeglass frame assembly provided in an embodiment of the present invention; Figure 25 This is a partial schematic diagram of a frame assembly provided in an embodiment of the present invention.

[0025] Icons: Lens body 100; Optical zone 1; Defocus abrupt change zone 2; Defocus gradual change zone 3; Wearing part 4; Hinge shaft 401; Covering part 402; Worm gear II 403; Worm 2 404; Bevel gear I 405; Bevel gear II 406; Gear body 407; Screen protector 408; Side slider 409; Horizontal guide rod 410; Rod seat 411; Tension spring 412; Frame assembly 5; Frame body 501; Bidirectional screw 502; Moving shaft rod 503; Upper shaft seat 504; Lens frame 505; Upper rotating shaft 506; Lower rotating shaft 507; Lower shaft seat 508; Worm 1 509; Worm gear I 510; Adjustment screw 511; Horizontal rack 512. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, so that those skilled in the art can implement it based on the description.

[0028] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0029] The following is in conjunction with the appendix Figure 1-25 The present invention provides a myopia control lens with a sharp defocus reduction, comprising a lens body 100. The central region of the lens body 100 has an optical region 1 for imaging light onto the retina. A defocus reduction region 2 is arranged around the optical region 1 to focus light within a 10°-20° range from the fovea of ​​the macula onto the retina in front of or behind it. The defocus reduction region 2 includes a lens array composed of multiple microlenses. A defocus gradient region 3 is arranged around the defocus reduction region 2 to focus light beyond a 20° range from the fovea of ​​the macula onto the retina in front of or behind it. The defocus reduction amount of the gradient region 3 is less than that of the sharp defocus region 2. The gradient region 3 includes a microlens array. The rear surface of the lens body 100 is a spherical, aspherical, hyper-torus, or freeform surface structure. The working principle and technical effects of the above technical solution are as follows: This invention provides a myopia control lens with a sudden change in defocus, employing a sudden change in defocus design, where the defocus amount increases abruptly from the central optical zone 1 of the lens body 100 to the defocus abrupt change zone 2. Figure 15Some embodiments shown can achieve a defocus amount of -10.00D, enhancing the defocus effect. The defocus amount from the abrupt defocus change zone 2 to the gradual defocus change zone 3 is not fixed, achieving a dynamic defocus effect, such as... Figure 12 The image shows a microstructured light spot visible to the naked eye under projection from currently available defocus lenses. Further reductions in the diameter of the microlens are possible, such as... Figure 13 As shown in the invention, the microstructure light spot has been reduced before the lens coating, and further as... Figure 14 As shown, after coating the lens of this invention, the microstructure light spots are basically invisible, making them imperceptible to the naked eye, reducing visual interference, achieving an invisible effect, and improving aesthetics and wearing comfort. This solves the problems of strong visual interference from microstructures in existing myopia control lenses, which cause long initial adaptation periods and unstable control effects due to fixed defocus. In this way, it can further achieve the purpose of inhibiting axial elongation and controlling the progression of myopia.

[0030] Example 1: As Figures 1-15 As shown, in a myopia control lens with shadowless abrupt defocusing of the present invention, the front surface of the lens body 100 is a spherical surface, an aspherical surface, a toroidal surface, or a freeform surface, preferably a freeform surface; the rear surface of the lens body 100 is a spherical surface, an aspherical surface, a toroidal surface, or a freeform surface, preferably a freeform surface.

[0031] A frontal view schematic diagram of the myopia control lens with shadowless abrupt change in defocus provided by the present invention is shown below. Figure 7 As shown, optical region 1 is a regular hexagonal area with a diameter of 4-10 mm, which images light onto the retina. Preferably, the diameter of optical region 1 is 4 mm. The abrupt defocusing region 2 is adjacent to optical region 1, corresponding to a 10°-20° viewing angle range at the fovea. The gradual defocusing region 3 is located outside the abrupt defocusing region 2, corresponding to the area outside the 20° viewing angle at the fovea. In this embodiment, the abrupt defocusing region 2 and the gradual defocusing region 3 are selected as follows: Figure 5 The lens array shown is composed of microlenses arranged in a circular convex lens structure, and the arrangement is as follows: Figure 2 The arrangement shown is an alternating pattern; Figure 8 This invention provides a beam imaging diagram of a myopia control lens with shadowless abrupt defocusing when viewing distant objects. The abrupt defocusing zone 2 and the gradual defocusing zone 3 focus the light in front of the retina, with the image focal point formed by the abrupt defocusing zone 2 being farther from the retina than that formed by the gradual defocusing zone 3. The microlens in the abrupt defocusing zone 2 is a convex lens with a diopter range of +0.50D to +10.00D, the value depending on the diopter difference with optical zone 1. The microlens in the gradual defocusing zone 3 is also a convex lens with a diopter range of +0.50D to +10.00D, the value depending on the defocusing size of the abrupt defocusing zone 2. The microlens has a diameter of 0.25mm, making its shape invisible to the naked eye compared to existing multi-point defocusing lenses, thus achieving an invisible and aesthetically pleasing effect.

[0032] The following is an example of a myopia control lens with a sudden change in defocus without shadows, as described in this embodiment: Figure 9 This is a schematic diagram illustrating the refractive power change from the center to the periphery of the myopia control lens with abrupt defocusing, as provided in Embodiment 1 of the present invention. The prescription power of optical zone 1 is -4.00D, and the microlens power of the abrupt defocusing zone 2 is set to +9.00D, so the refractive power of the abrupt defocusing zone 2 is +5.00D. The defocusing amount of the 20°-30° viewing angle of the gradual defocusing zone 3 is set to half the size of the abrupt defocusing zone, so the refractive power of the 20°-30° viewing angle is +0.50D. The microlens power of the 30°-40° viewing angle is set to two-thirds the size of the defocusing amount of the abrupt defocusing zone 2, so the refractive power of the 30°-40° viewing angle is +2.00D.

[0033] In this example, the microlens is a convex lens, which, like multi-point defocus lenses on the market, focuses light in front of the retina, creating myopia defocus to achieve the effect of myopia control.

[0034] Example 2: Figures 1-15 As shown, in a myopia control lens with shadowless abrupt defocusing of the present invention, the front surface of the lens body 100 is a spherical surface, an aspherical surface, a toroidal surface, or a freeform surface, preferably a freeform surface; the rear surface of the lens body 100 is a spherical surface, an aspherical surface, a toroidal surface, or a freeform surface, preferably a freeform surface.

[0035] A frontal view schematic diagram of the myopia control lens with shadowless abrupt change in defocus provided by the present invention is shown below. Figure 7 As shown, optical region 1 is a regular hexagonal area with a diameter of 4-10 mm, which images light onto the retina. Preferably, the diameter of optical region 1 is 4 mm. The abrupt defocusing region 2 is adjacent to optical region 1, corresponding to a 10°-20° visual angle range at the fovea. The gradual defocusing region 3 is located outside the abrupt defocusing region 2, corresponding to a 20°-40° visual angle range at the fovea. The abrupt defocusing region 2 and the gradual defocusing region 3 are formed as follows: Figure 4 The image shows a lens array composed of multiple circular micro-concave lenses arranged in a row.

[0036] Figure 10This invention provides a beam imaging diagram of a myopia control lens with a shadowless abrupt defocusing effect when viewing distant objects. The abrupt defocusing zone 2 and the gradual defocusing zone 3 focus light behind the retina, with the image focal point formed by the abrupt defocusing zone 2 being farther from the retina than that formed by the gradual defocusing zone 3. The microlens in the abrupt defocusing zone 2 is a concave lens with a diopter range of -0.50D to -10.00D, the value depending on the diopter difference with optical zone 1. The microlens in the gradual defocusing zone 3 is also a concave lens with a diopter range of -0.50D to -10.00D, the value depending on the defocusing size of the abrupt defocusing zone 2. The microlenses are 0.25mm in diameter, making them invisible to the naked eye compared to existing multi-point shapes, thus achieving an invisible and aesthetically pleasing effect.

[0037] The following is an example of a myopia control lens with a sudden change in defocus without shadows, as described in this embodiment: Figure 11 This is a schematic diagram illustrating the refractive power change from the central area to the periphery of the myopia control lens with shadowless abrupt defocus provided in Embodiment 2 of the present invention. Figure 11 As shown, the prescription power of optical zone 1 is -4.00D, and the difference in defocus abrupt change zone 2 is set to -8.00D, so the refractive power of defocus abrupt change zone 2 is -12.00D; the microlens refractive power of the 20°-30° angle of defocus gradient zone 3 is set to half the defocus amount of the abrupt change zone, so the refractive power of the 20°-30° angle of defocus is -6.00D; the microlens refractive power of the 30°-40° angle of defocus is set to two-thirds the defocus amount of the abrupt change zone 2, so the refractive power of the 30°-40° angle of defocus is -8.00D.

[0038] In this example, the microlens used is a concave lens, which serves to evenly disperse light and reduce the contrast of the peripheral retina, thereby achieving the effect of myopia prevention and control. It is similar to the contrast-reducing prevention and control lenses on the market, but the technical means and principles are different from those in Example 1, thus achieving the desired prevention and control effect.

[0039] Example 3: Based on Examples 1 and 2, the defocusing amount of the abrupt defocusing zone 2 is fixed at ±10.00D; and the defocusing gradient zone 3 is not set, which is a variant design of Examples 1 and 2.

[0040] The variant design of the above scheme is beneficial to achieve a certain level of prevention and control while effectively simplifying the processing technology, setting the same decoking amount, and reducing processing time and processing costs.

[0041] Example 4: The defocus abrupt change zone 2 and the defocus gradual change zone 3 are disposed on the front surface of the lens body, or on the rear surface of the lens body, or simultaneously on the front and rear surfaces of the lens body; The defocus abrupt change region 2 and the defocus gradual change region 3 of the lens body are processed using grayscale photolithography technology, specifically: 1. Fabrication of the target structure mask: The target structure mask is fabricated using either a laser direct writing machine or an electron beam direct writing machine. The resolution of a laser direct writing machine is 2μm, while the precision of an electron beam direct writing machine is higher than that of a laser direct writing machine.

[0042] 2. Uniformly coat photoresist on the front and back surfaces of the microstructure region: Use a centrifugal spin coater to uniformly coat a layer of photoresist on the desired lens surface of the microstructure region. In specific implementations, depending on the type of the desired microstructure (microlens) shape, the photoresist can be either positive or negative.

[0043] 3. Transfer the pattern of the target structure mask onto the surface of the required lens in the microstructure area: Apply photolithography to transfer the pattern of the target grayscale photomask onto the surface of the microstructure area, so that some areas are fully exposed and some areas are partially exposed, to obtain the photoresist microlens array pattern.

[0044] 4. Exposure and development are performed using a target structure mask to obtain the microstructure on the desired lens surface in the microstructure region. After exposure and development of the photoresist through the fabricated structure mask, a micro-relief structure formed by the photoresist material is obtained. The required exposure amount, developer concentration, and development time are determined based on the depth of the target relief structure. Through exposure and development, the microstructure is first obtained on the surface of the photoresist.

[0045] 5. Based on the microstructure, the required lens surface in the microstructure region is etched: The required lens surface of the microstructure region of the fabricated photoresist microlens array is placed in the vacuum chamber of the ion beam etching machine for ion beam etching. After the photoresist microlens array is etched, the lens corresponding to the surface of the microstructure region is taken out from the vacuum chamber.

[0046] 6. Remove the photoresist from the lens surface in the microstructure region to obtain a lens with a microlens array: Use oxygen ions to completely remove the photoresist from the lens surface in the microstructure region to obtain a lens with a microlens array.

[0047] The defocus abrupt change zone 2 and the defocus gradual change zone 3 of the lens body are processed using ultra-precision turning technology. Based on the required microlens model, the corresponding tooling action paths for the lens surfaces of the microstructure zones are generated, specifically as follows: Local interval fitting is performed on the required microlens surface model to generate all tool contact points for each of the required lens surfaces corresponding to the microstructure region. Based on the position coordinates of all tool contact points on the required lens surfaces of the microstructure region, a motion path for tool machining is fitted and generated for each of the required lens surfaces of the microstructure region.

[0048] The actual tool movement characteristics during tool processing along the said action path are obtained; based on the actual tool movement characteristics, the real-time processing error of the microstructure region is estimated, and the processing strategy of the microstructure region is adjusted accordingly.

[0049] Furthermore, the actual tool movement characteristics during tool machining along the said action path are obtained, specifically: Visual recognition is performed during tool machining along the said motion path to obtain actual tool motion characteristics; wherein, the actual tool motion characteristics include the motion posture and motion amplitude of the tool at each tool contact point during tool machining along the said motion path.

[0050] Furthermore, based on the actual tool movement characteristics, the real-time machining error of the microstructure region is estimated, and the machining strategy for the microstructure region is adjusted accordingly, specifically as follows: Based on the actual tool movement characteristics, determine the machining surface profile formed by the tool at each tool contact point and within its preset radius; compare the machining surface profile with the desired surface profile to estimate the real-time machining profile shape error of the microstructure region. Based on the real-time machining contour shape error, the tool movement rate during tool machining of the microstructure region is adjusted.

[0051] Example 5: Please refer to Figures 1-25 As shown, based on Embodiment 1, the present invention also provides a protection device, including a wearing part 4 and the lenses described in Embodiment 1. The wearing part 4 is equipped with a wearing strap, and a frame assembly 5 is disposed inside the wearing part 4. The frame assembly 5 includes a frame body 501 disposed inside the wearing part 4. A parallel bidirectional screw 502 and a movable shaft 503 are rotated in the central groove of the frame body 501. Two oppositely distributed upper shaft seats 504 are screwed onto the bidirectional screw 502. The two upper shaft seats 504 are connected to two lens holders 505. The upper rotating shaft 506 is rotatably connected, and each of the two lens holders 505 is equipped with a lens body 100. The lower rotating shaft 507 of the two lens holders 505 is rotatably connected to two lower shaft seats 508. The two lower shaft seats 508 are rotatably mounted on two worm gears 509. The two worm gears 509 are both sleeved on the moving shaft 503. The protrusion in the center hole of the worm gear 509 slides in the guide groove on the moving shaft 503. The two worm gears 509 mesh with the worm wheels 510 on the two lower rotating shafts 507.

[0052] The prevention and control device of the present invention can be used as glasses to assist vision or assist in vision training, reduce astigmatism and improve visual quality. When in use, the user wears the wearing part 4 on the eyes through the wearing strap. The contact end of the wearing part 4 with the user is provided with a soft memory foam pad to reduce discomfort when wearing. The contact end of the wearing part 4 with the user has an arc-shaped structure so as to better fit the user's face.A frame assembly 5 for mounting lenses is installed within the wearing part 4. Lenses of different prescriptions can be customized according to actual needs. The lenses are then installed in two lens frames 505. After installation, the distance between the two lens frames 505 can be adjusted according to the user's interpupillary distance, thereby adjusting the distance between the lenses within the two lens frames 505. By adjusting according to the user's interpupillary distance, alignment between the lenses and the eyeball can be ensured, avoiding eye fatigue and discomfort, and improving the comfort of wearing the lenses. Moreover, this adjustment can be made at any time. Compared with custom-made glasses in the prior art, the control device of this invention is easy to adjust as the user grows, achieving better performance at different stages. It can make the distance between the lenses and the user's eyeball more closely fit, reducing visual distortion and aberration. This adjustment enhances the user's visual experience when using the lenses, reduces eye muscle fatigue and tension, improves comfort, and effectively avoids visual problems such as dizziness and headaches that may result from incorrect pupillary distance adjustment, thus protecting the user's visual health. During adjustment, the bidirectional screw 502 is rotated. Since one end of the bidirectional screw 502 has a left-hand thread and the other end has a right-hand thread, when the bidirectional screw 502 rotates to change its connection position with the two upper shaft seats 504, the two upper shaft seats 504 can drive the two lens holders 505 to move closer or further apart via the two upper rotating shafts 506. The lower rotating shafts 507 at the bottom of the two lens holders 505 drive two worm gears 509 to slide on the moving shaft 503 via the two lower shaft seats 508. The movable shaft 503 serves as a guide. Additionally, the protrusions within the central holes of the two worm gears 509 slide within the guide grooves on the movable shaft 503. This ensures that changes in the relative position of the two worm gears 509 and the movable shaft 503 do not affect the movable shaft 503's ability to rotate the two worm gears 509. Controlling the rotation of the movable shaft 503 drives the two worm gears 509 to rotate, which in turn engages with the two worm wheels 510, thereby rotating the two lower rotating shafts 507. The two worm gears 509 rotate in opposite directions, causing the two worm wheels 510 to rotate in different directions. This allows for a certain adjustment of the lens angle within the two lens frames 505, better meeting the user's eye characteristics. By controlling the lens... The tilt angle of the lens can be adjusted to change the focal length and focus point of the lens, improving the user's field of vision and clarity, and enhancing the visual experience. Tilting the lens can change the direction and path of light refraction within the lens, allowing light to focus better on the eyeball, reducing light scattering and reflection, and improving visual quality. Furthermore, by changing the angle of the tilted lens, the degree of astigmatism can be adjusted, helping to correct certain eye problems such as astigmatism, and improving visual clarity and comfort. This allows the tilt angle of the internal lens of the invention to be personalized according to the user's eye characteristics and degree of myopia, ensuring the best fit between the lens and the eyeball, improving wearing comfort, reducing eye muscle tension and fatigue, alleviating eye discomfort caused by prolonged use of the lens, and protecting eye health.Furthermore, when the user does not wish to view through the lenses, there is no need to remove the protection device. First, the two lenses can be rotated via the movable shaft 503 to align them perpendicular to the user's face. Then, the two lens holders 505 can be separated via the rotation of the bidirectional screw 502, causing the lenses within the two lens holders 505 to approach the left and right ends of the inner cavity of the wearing part 4. At this point, the user can look out through the opening at the front end of the wearing part 4.

[0053] The frame 501 slides at both ends in the transverse grooves on the left and right sides of the wearing part 4. The frame 501 is screwed onto the adjusting screw 511, which is rotatably connected to both ends of the transverse groove of the wearing part 4. A cover part 402 is fixedly connected to the hinge shaft 401 hinged to the front side of the wearing part 4. The cover part 402 is fastened into the opening at the front end of the wearing part 4. The second worm gear 403 fixedly connected to the hinge shaft 401 meshes with the second worm 404 rotatably connected to the top of the wearing part 4. One end of the second worm 404 inserted into the wearing part 4 is fixed with a first bevel gear 405. The first bevel gear 405 meshes with the second bevel gear 406. The axle of the second bevel gear 406 is rotatably mounted inside the wearing part 4. The gear body 407 fixed at the lower end of the axle can mesh with the transverse rack 512 fixed on the frame 501. A VR display screen is mounted on the inner side of the cover part 402.

[0054] A blocking part 402 is fixedly connected to a hinge shaft 401 hinged to the front side of the wearing part 4. The blocking part 402 is fastened into the opening at the front end of the wearing part 4, and a VR display screen is mounted on the inner side of the blocking part 402. This allows the present invention to also be used as a device for visual training and recovery. The visual recovery training of the steep myopia defocus control lens of the present invention can be achieved by combining it with VR glasses through the following steps: 1. Determine the user's individual myopia degree and eye characteristics to design customized control lenses and ensure optimal fit; 2. Utilize the virtual reality technology of VR glasses to design games or applications for visual rehabilitation training, including eye movement and visual training programs; 3. Users wear VR glasses that combine lenses for controlling defocus in cases of sudden myopia progression to improve vision and visual function through training content of varying difficulty and challenge. 4. Monitor the user's performance and progress during training, and make personalized adjustments as needed to help the user conduct visual recovery training more effectively; 5. As training progresses, regularly check the user's vision, assess the training effect, and adjust the training plan as needed to ensure the effectiveness and continuity of vision recovery training.

[0055] Through the above-mentioned visual recovery training, users' eyes can be effectively cared for, and the tension and fatigue of the eye muscles can be reduced, alleviating the discomfort caused by prolonged use of lenses and protecting eye health.

[0056] The frame 501 is screwed onto the adjusting screw 511, which is connected to both ends of the transverse groove of the wearing part 4. By controlling the rotation of the adjusting screw 511, its contact position with the frame 501 can be changed, thereby controlling the sliding movement of the frame 501 in the back-and-forth direction within the wearing part 4. Adjusting the distance between the lens on the lens frame 505 and the user's eyeball can improve visual clarity. Adjusting the distance between the lens and the user's eyeball ensures that light is correctly focused on the eyeball, reduces astigmatism and focus shift, improves visual clarity, and a proper distance adjustment can reduce eye muscle tension and fatigue. This invention improves the comfort of wearing lenses, reduces eye discomfort, and makes lenses more suitable for individual user needs, thereby enhancing the lens's effectiveness. In particular, when the abrupt myopia defocus control lens of this invention is integrated into VR glasses for visual recovery training, the user experience is improved. A blocking part 402 is fixedly connected to the hinge shaft 401 hinged to the front side of the wearing part 4. The blocking part 402 is fastened into the opening at the front end of the wearing part 4. An airbag is adhered to the contact surface between the blocking part 402 and the wearing part 4 to improve sealing and prevent light leakage from affecting the performance. There are two adjustment methods when it is necessary to open the opening at the front end of the wearing part 4: One method is to manually rotate the worm gear 404 for adjustment. The worm gear 404 meshes with the worm wheel 403 and rotates, thereby driving the hinge shaft 401 to rotate, so as to control the opening of the shielding part 402. The angle of the opening of the shielding part 402 can be adjusted to meet the needs of different situations. Another method involves controlling the rotation of the adjusting screw 511 to move the frame 501 toward the blocking part 402. When the transverse rack 512 on the frame 501 moves forward and contacts the gear body 407, it can mesh with the gear body 407 and rotate. The rotation of the gear body 407 drives the second bevel gear 406 to rotate through the axle. The second bevel gear 406 rotates by meshing with the first bevel gear 405, which in turn drives the second worm gear 404 to rotate. When the frame 501 moves the transverse rack 512 toward the blocking part 402, the blocking part 402 is flipped open. When the frame 501 moves the transverse rack 512 away from the blocking part 402, the blocking part 402 is flipped closed. This method is very convenient to operate.

[0057] The control device also includes a screen protector 408, with side sliders 409 fixed on both the left and right sides of the screen protector 408. The two side sliders 409 slide in the middle of two horizontal guide rods 410. The front and rear ends of the two horizontal guide rods 410 are fixed to the top surface inside the wearing part 4 through rod seats 411. The front ends of the two side sliders 409 are fixedly connected to the two rod seats 411 near the shielding part 402 through two tension springs 412 sleeved on the horizontal guide rods 410.

[0058] In its normal state, the screen protector 408 is housed within the wearing part 4. At this time, the tension spring 412 is in a stretched state, and the front end of the screen protector 408 is pressed against the inner side of the shielding part 402 under the elastic force of the tension spring 412. When the shielding part 402 is flipped open, the shielding part 402 gradually releases its obstruction to the screen protector 408. The screen protector 408 can slide out to the front of the wearing part 4 under the tension spring 412, thereby shielding the VR display screen below the shielding part 402, which facilitates the protection of the VR display screen and prevents damage to the VR display screen when the present invention is dropped. The front end of the screen protector 408 is provided with a slope. When the shielding part 402 is closed, the shielding part 402 can press against the slope of the screen protector 408 to make it retract into the wearing part 4. Alternatively, the screen protector 408 can be manually controlled to retract into the wearing part 4, and the shielding part 402 can be controlled to close.

[0059] One end of the bidirectional screw 502 is connected to a first motor mounted on the frame 501; one end of the moving shaft 503 is connected to a second motor mounted on the frame 501; and one end of the adjusting screw 511 is connected to a third motor mounted inside the wearing part 4. The first, second, and third motors are all electrically connected to a controller on the outer surface of the wearing part 4. The controller is electrically connected to three control switches to control the operation of the first, second, and third motors. All three motors are bidirectional motors, facilitating the separate control of the bidirectional screw 502, the moving shaft 503, and the adjusting screw 511 to rotate in different clockwise directions.

[0060] A massage airbag is attached to the outer surface of the lens holder 505. After the adjusting screw 511 is tilted to a certain angle by the control shaft 503, the massage airbag on the lens holder 505 can be made to contact the user's eyes by the adjusting screw 511. Then, the lens holder 505 is controlled to reciprocate in opposite directions or away from each other by the bidirectional screw 502, thereby massaging the user's eyes. A handwheel is fixed to the front end of the worm gear 404 to improve the effect of manually controlling the rotation of the worm gear 404.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A myopia control lens with a sudden change in defocus without shadow, characterized in that, The lens body includes an optical zone (1) in the center of the lens body for imaging light onto the retina; an optical zone (1) is surrounded by a defocusing abrupt change zone (2) for focusing light within a range of 10°-20° from the fovea of ​​the macula onto the retina in front of or behind it; the defocusing abrupt change zone (2) includes a lens array composed of multiple micro-structure lenses; the defocusing abrupt change zone (2) is surrounded by a defocusing gradient zone (3) for focusing light beyond 20° from the fovea of ​​the macula onto the retina in front of or behind it, the defocusing amount of the defocusing gradient zone (3) is less than the defocusing amount of the defocusing abrupt change zone (2), and the defocusing gradient zone (3) includes a micro-lens array.

2. The lens as described in claim 1, characterized in that, The optical area (1) is a circular, elliptical or regular polygonal area with a diameter of 4-10 mm.

3. The lens as described in claim 1, characterized in that, The multiple microstructure lenses in the lens array in the defocus abrupt change zone (2) are arranged in a spaced, close, or intersecting manner.

4. The lens as described in claim 3, characterized in that, The shape of the microstructure lens is one or more of the following: circular, elliptical, arc-shaped, bow-shaped, and regular polygonal; the microstructure lens in the defocus abrupt change region is a convex lens with a refractive power range of +0.50D to +20.00D or a concave lens with a refractive power range of -0.50D to -20.00D.

5. The lens as described in claim 1, characterized in that, In the microlens array of the defocus gradient region (3), the microlens shape is one or more combinations of circles, ellipses, arcs, bows, and regular polygons; in the microlens array of the defocus gradient region (3), multiple microlenses are arranged alternately, closely, or intersectingly.

6. The lens as described in claim 1, characterized in that, The microlenses in the defocus gradient zone (3) are convex lenses with a refractive power range of +0.50D to +10.00D or concave lenses with a refractive power range of -0.50D to -10.00D.

7. The lens as described in claim 1, characterized in that, The refractive power of the microlens in the 20°-30° angle of defocus gradient zone is half that of the defocus amount in the steep defocus zone (2), and the refractive power of the microlens in the 30°-40° angle of defocus gradient zone is two-thirds that of the defocus amount in the steep defocus zone.

8. The lens as described in claim 1, characterized in that, The defocus abrupt change zone (2) and the defocus gradual change zone (3) are located on the front surface of the lens body, or on the rear surface of the lens body, or on both the front and rear surfaces of the lens body.

9. The lens as described in claim 8, characterized in that, The defocus abrupt change zone (2) and defocus gradual change zone (3) of the lens body are processed by grayscale lithography or ultra-fine turning technology.

10. A prevention and control device, characterized in that, The device includes a wearing part (4) with a wearing strap and a lens as described in any one of claims 1-9. The wearing part (4) is provided with a frame assembly (5). The frame assembly (5) includes a frame body (501) disposed in the wearing part (4). A bidirectional screw (502) and a movable shaft (503) arranged side by side are rotated in the central groove of the frame body (501). Two oppositely distributed upper shaft seats (504) are screwed onto the bidirectional screw (502). The two upper shaft seats (504) rotate with the upper rotating shafts (506) of the two lens frames (505). The two lens holders (505) are each equipped with a lens body. The lower rotating shaft (507) of the two lens holders (505) is rotatably connected to the two lower shaft seats (508). The two lower shaft seats (508) are rotatably mounted on two worm gears (509). The two worm gears (509) are both sleeved on the moving shaft (503). The protrusion in the center hole of the worm gear (509) slides in the guide groove on the moving shaft (503). The two worm gears (509) mesh with the worm wheels (510) on the two lower rotating shafts (507).

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