Progressive out-of-focus myopia prevention and control glasses

Abstract

The progressive out-of-focus myopia prevention and control glasses comprise a lens body, the inner surface of the lens body comprises a far vision area, a near vision area, a progressive channel and an astigmatism area, a visual area A is arranged in the far vision area, positive out-of-focus micro lenses are distributed in the visual area A, a visual area B is arranged in the near vision area, positive out-of-focus micro lenses are distributed in the visual area B, and the astigmatism area is arranged in the progressive channel. No positive out-of-focus micro lens is arranged in the progressive channel and the area where the progressive channel is communicated with the visible area A and the visible area B. The invention has the advantages that the myopia prevention and control effect of the out-of-focus glasses is fully exerted, and myopia prevention and control and wearing comfort during long-time near vision are ensured.

Description

Technical Field

[0001] The present invention relates to the field of myopia prevention and control glasses, and in particular to a pair of progressive defocus myopia prevention and control glasses. Background Art

[0002] The current mainstream myopia prevention and control glasses are defocus glasses, which have a good myopia prevention and control effect, but the disadvantage is that the center of the defocus lens has only a visual area (i.e., optical area) of 7mm to 9mm in width, and is surrounded by microlenses. The eyes can only see objects clearly through the visual area. If the eyes are slightly misaligned with the visual area, the compensatory microlenses will cause the objects to be blurred. At the same time, the refractive power of the lens body of the defocus glasses used to prevent and control myopia is used to correct distant blurred vision, and is a distance degree. When the eyes look at close objects, they are still corrected with the distance degree, which can easily cause visual fatigue. However, teenagers, especially those in higher grades, need to use their eyes at close range for a long time, such as when bending down to do homework or read. When using defocused glasses, since the objects they see are located below the eyes, it is difficult for them to completely align their sight with the visual area when they look down. Part of their sight will fall on the microlens area, affecting the visual quality. At the same time, since the distance power configured on the lens body is still used for correction when looking at close objects, blurred vision, dizziness, and discomfort may easily occur after using defocused glasses for a long time. Therefore, the existing defocused glasses are mostly only used among elementary and junior high school students.

[0003] Progressive multifocal glasses used to prevent and control myopia in the early days are only suitable for some groups with hyperaccommodative function, presbyopia, and esotropia. The applicable group is relatively narrow. Only 20% of children with abnormal visual function wear this kind of glasses to relieve fatigue and control myopia. They are gradually being eliminated. Figure 1 As shown, because the progressive addition lens body 10 has astigmatism zones 14 on both sides, a person cannot see clearly by simply turning their eyes. They need to simultaneously turn their neck and eyes to see clearly. Therefore, if the head is not turned properly when wearing the lens, dizziness can easily occur. Furthermore, when the user lowers their head to look at an object, their eyes are tilted toward the side of their nose, and a small portion of their vision still passes through the astigmatism zones. This can easily cause discomfort when looking at objects at close range for extended periods. Combining progressive addition glasses with defocused glasses to improve myopia prevention and control and eliminate visual fatigue, dizziness, and blurriness caused by prolonged close-up vision has become an urgent issue. Summary of the Invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a progressive defocus myopia prevention and control glasses, which fully exert the myopia prevention and control function of defocus glasses, and ensure that there is a visual area and appropriate refractive power correction vision when looking at close objects, thereby improving wearing comfort and alleviating long-term eye fatigue.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A pair of progressive defocus myopia prevention and control glasses, comprising a lens body, the inner surface of the lens body comprising a far vision zone, a near vision zone, a progressive channel, and an astigmatism zone, a visual zone A being provided in the far vision zone and distributed with positive defocus microlenses, a visual zone B being provided in the near vision zone and distributed with positive defocus microlenses, and no positive defocus microlenses being provided in the progressive channel or in the area where the progressive channel communicates with the visual zones A and B.

[0007] More preferably, a far vision measurement point is set 8 to 10 mm above the geometric center of the lens body; the center of the visual zone A is located on the far vision measurement point, and the positive defocus microlenses in the far vision zone are arranged on the outer surface of the lens body and are evenly distributed in a fan ring with the far vision measurement point as the center, and the defocus diopter of these positive defocus microlenses gradually changes from +2.50D to +6.00D from the inside to the outside.

[0008] More preferably, a near vision measurement point is set at a position 9 to 15 mm below the geometric center of the lens body and 1 to 3 mm inward from the horizontal nasal side; the center of the visual zone B is located on the near vision measurement point, and the positive defocus microlenses in the near vision zone are arranged on the outer surface of the lens body and are evenly distributed in a fan ring with the near vision measurement point as the center, and the defocus diopter of these positive defocus microlenses gradually changes from +2.50D to +6.00D from the inside to the outside.

[0009] More preferably, the progressive channel is an area ranging from the geometric center of the lens body to the upper edge of the visual zone B of 7 to 13 mm.

[0010] More preferably, negative defocus microlenses are distributed on the inner surface of the astigmatism area, and the defocus power of the negative defocus microlenses in the astigmatism area gradually changes from -2.50D to -6.00D along the direction from the geometric center of the lens body to the edge of the lens body.

[0011] More preferably, the boundary line between the far vision zone and the astigmatism zone is set as a first reference line, and the areas 3 to 5 mm above and below the first reference line are first transition zones, and the defocus powers of the positive defocus microlenses and the negative defocus microlenses located in the first transition zone gradually transition to 0D along the direction from the edge line of the first transition zone to the first reference line; the boundary line between the near vision zone and the astigmatism zone is set as a second reference line, and the areas 3 to 5 mm above and below the second reference line are second transition zones, and the defocus powers of the positive defocus microlenses and the negative defocus microlenses located in the second transition zone gradually transition to 0D along the direction from the edge line of the second transition zone to the second reference line.

[0012] More preferably, the positive defocus microlenses and the negative defocus microlenses are circular or elliptical. When they are circular, the diameter of the circle is 0.5 to 3 mm; when they are elliptical, the major axis is 1 to 6 mm and the minor axis is 0.5 to 3 mm.

[0013] More preferably, the lower added light ADD of the lens body ranges from +0.50D to +1.50D.

[0014] More preferably, the diameter of the visible area A ranges from 7 mm to 10 mm, and the diameter of the visible area B ranges from 5 mm to 8 mm.

[0015] The present invention has the following beneficial effects:

[0016] 1. The progressive defocus myopia prevention and control glasses of the present invention combine the characteristics of progressive multifocal lenses with those of defocus glasses. Objects are imaged in front of the retina or on the peripheral retina through positive defocus microlenses, thereby inhibiting the growth of the eye axis and achieving myopia prevention and control. At the same time, when looking at near objects, the anti-myopia principle of progressive multifocal lenses is utilized, and myopia correction is performed through the bottom light ADD. The corrected refractive power is more in line with the needs of near vision. Therefore, the present invention not only plays a good role in preventing and controlling myopia, but also can greatly improve the comfort when looking at near objects, and it is not easy to cause dizziness, visual fatigue and other problems after looking at near objects for a long time.

[0017] 2. The present invention combines the advantages of defocus glasses and progressive multifocal glasses, thereby greatly improving the wearing comfort of the glasses regardless of whether the user is looking far away or looking at near for a long time, and can play a better role in preventing and controlling myopia.

[0018] 3. The present invention arranges a negative defocus microlens in the astigmatism area to reduce or eliminate the influence of astigmatism on the imaging quality, thereby improving the comfort of long-term near vision. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of a progressive multifocal lens in the prior art;

[0020] Figure 2 A schematic diagram of the structure of a positive defocus microlens provided in the present invention;

[0021] Figure 3 Schematic cross-sectional view of a positive defocused microlens in the far field of view according to the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the positive and negative defocus micro lenses of the present invention;

[0023] Figure 5 is a schematic cross-sectional view of a negative defocus microlens in an astigmatic region of the present invention;

[0024] Description of reference numerals:

[0025] 10. Lens body; 11. Far vision zone; 12. Progressive channel; 13. Near vision zone; 14. Astigmatism zone;

[0026] 15. Negative defocus microlens; 16. First transition zone; 17. Second transition zone; 20. Positive defocus microlens 20. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0028] See also Figure 2 and Figure 3 , a pair of progressive defocus myopia prevention and control glasses, comprising a lens body 10, and the lens body 10 is a progressive multifocal lens. The inner surface of the lens body 10 includes a far vision zone 11, a near vision zone 13, a progressive channel 12 and an astigmatism zone 14. A visual zone A is set in the far vision zone 11. When looking at a distance, distant objects are observed through the visual zone A. A far vision measurement point C is set 8 to 10 mm above the geometric center O of the lens body 10, and the center of the visual zone A is located on the far vision measurement point C. Exemplarily, the diameter of the visual zone A is between 7 mm and 10 mm, and the diameter of the visual zone B is between 5 mm and 8 mm. A visual zone B is set in the near vision zone 13. When looking at near, nearby objects are observed through the visual zone B, thereby ensuring visual quality. The near vision measurement point D is set at a position 9 to 15 mm below the geometric center O of the lens body 10 and 1 to 3 mm inwardly to the horizontal nasal side. The center of the visual zone B is located on the near vision measurement point D. By shifting the near vision measurement point D inwardly to the horizontal nasal side, the astigmatism zone 14 in the near-nasal area can be reduced, making the near vision zone 13 in the near-nasal area larger, thereby meeting the visual field requirements when looking at near objects. The progressive channel 12 is the area ranging from the geometric center O of the lens body 10 to 7 to 13 mm from the upper edge of the visual zone B. Positive defocus microlenses 20 are distributed in both the far vision zone 11 and the near vision zone 13. Visual zones A and B are areas where no microlenses are set. This is common knowledge in the art. No positive defocus microlenses 20 are provided in the progressive channel 12 and in the area E where the progressive channel 12 connects with the visual areas A and B. When the line of sight gradually moves from a distance to a near distance, the visual interference caused by the positive defocus microlenses 20 can be completely avoided, thereby improving the visual quality and enhancing the user's comfort when wearing the glasses.

[0029] Exemplarily, the positive defocus microlenses 20 of the far vision zone 11 are distributed as follows: the positive defocus microlenses 20 are evenly distributed in a sector ring 3.5 mm to 17 mm from the far vision measurement point C on the outer surface of the far vision zone 11, the notch angle of the sector ring is between 90° and 120°, and the defocus luminosity of the positive defocus microlenses 20 from the inside to the outside gradually changes from +2.50D to +6.00D. The positive defocus microlenses 20 are evenly distributed in a sector ring 2.5 mm to 15 mm from the far vision measurement point C on the outer surface of the near vision zone 13, the notch angle of the sector ring is between 90° and 120°, and the defocus luminosity of the positive defocus microlenses 20 from the inside to the outside gradually changes from +2.50D to +6.00D.

[0030] +6.00D gradually changes.

[0031] Please combine Figure 4 and Figure 5 More preferably, negative defocus microlenses 15 are distributed on the inner surface of the astigmatism zone 14. The defocus power of the negative defocus microlenses 15 in the astigmatism zone 14 gradually changes from -2.50D to -6.00D along the geometric center O of the lens body 10 toward the edge of the lens body 10. The negative defocus microlenses 15 neutralize blurred vision caused by the curvature disorder of the astigmatism zone 14, thereby reducing or eliminating the impact of astigmatism on image quality, thereby improving comfort when looking at near objects for extended periods of time.

[0032] In order to smoothly transition the defocus luminosity difference between the positive defocus microlens 20 and the negative defocus microlens 15 in adjacent areas, the present invention further provides a first transition area 16 and a second transition area 17 . The specific structure is as follows: the boundary line between the far vision zone 11 and the astigmatism zone 14 is set as a first reference line L1, and the 3-5 mm area above and below the first reference line L1 is a first transition zone 16. For example, the 4 mm area above and below is used as the first transition zone 16, and the defocus brightness of the positive defocus microlens 20 and the negative defocus microlens 15 located in the first transition zone 16 gradually transitions to 0D along the direction from the edge line of the first transition zone 16 to the first reference line L1; the boundary line between the near vision zone 13 and the astigmatism zone 14 is set as a second reference line L2, and the 3-5 mm area above and below the second reference line L2 is a second transition zone 17. For example, the 4 mm area above and below is used as the second transition zone 17, and the defocus brightness of the positive defocus microlens 20 and the negative defocus microlens 15 located in the second transition zone 17 gradually transitions to 0D along the direction from the edge line of the second transition zone 17 to the second reference line L2.

[0033] Preferably, the lower addition ADD of the lens body 10 ranges from +0.50 D to +1.50 D. In the near vision zone 13, the ADD generates near vision diopter, thereby reducing dizziness during long-term near vision and improving wearing comfort.

[0034] Preferably, the positive defocus microlenses 20 are outwardly convex lenses. The negative defocus microlenses 15 are formed by inwardly concave surfaces of the lens body 10. The positive defocus microlenses 20 and negative defocus microlenses 15 are circular or elliptical. When circular, the diameter of the circle is 0.5 to 3 mm; when elliptical, the major axis is 1 to 6 mm and the minor axis is 0.5 to 3 mm.

[0035] Wearing the progressive defocus myopia prevention and control glasses of the present invention, when looking at far objects, the visual area A is used to observe distant objects, and the positive defocus microlens 20 is used to image surrounding objects in front of the retina or on the peripheral retina, thereby inhibiting the growth of the eye axis and playing a role in myopia prevention in the far vision state. When looking at near objects, the visual area B at the bottom of the lens is used to observe near objects, and the anti-myopia principle of the progressive multifocal lens is utilized. Under the action of the lower light ADD, a near vision refractive power is generated, and at the same time, the near vision degree corrects the vision, thereby improving the myopia prevention and control effect when looking at near objects. The present invention combines the advantages of defocus glasses and progressive multifocal glasses, thereby improving the wearing comfort of the glasses and being able to play a better myopia prevention and control effect. The present invention also provides a negative defocus microlens 15 in the astigmatism zone 14 to neutralize the blurred vision caused by the curvature disorder of the astigmatism zone 14, and expands the near vision zone 13 near the nose to improve the comfort when looking at near objects.

[0036] The lens body 10 of the present invention changes the setting method of the existing defocus glasses in which the positive defocus microlenses 20 are evenly distributed - a visual zone A for far vision and a visual zone B for near vision are set, and positive defocus microlenses 20 are set in both the near vision zone 13 and the far vision zone 11. Then, it is further combined with the near vision correction method of the progressive multifocal lens to generate near vision refractive power through the bottom light ADD, so that when the wearer looks at objects at close range for a long time, he will not feel uncomfortable wearing the object because the eyeball is not aligned with the central optical zone, causing the line of sight to pass through the positive defocus microlens 20 to see the object, nor will he feel dizzy and visual fatigue caused by looking at near objects for a long time with far vision. The wearer can see objects through the visual zone when looking at far and near, ensuring the visual quality, while at the same time correcting the vision through the positive defocus microlenses 20, giving full play to the anti-myopia effect of the defocus glasses. Therefore, the prevention and control glasses of the present invention can greatly improve the dizziness, visual fatigue and other eye discomforts caused by long-term near vision, and greatly improve the overall comfort when wearing.

[0037] The above description is only a specific embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A pair of progressive defocus myopia prevention and control glasses, characterized by: The lens body comprises a lens body, the inner surface of which comprises a far vision zone, a near vision zone, a progressive channel, and an astigmatism zone. A visual zone A is provided in the far vision zone and is distributed with positive defocus microlenses. A visual zone B is provided in the near vision zone and is distributed with positive defocus microlenses. No positive defocus microlenses are provided in the progressive channel or in the area where the progressive channel connects with the visual zones A and B.

2. The progressive defocus myopia prevention and control glasses according to claim 1, characterized in that: A far vision measurement point is set 8 to 10 mm above the geometric center of the lens body; the center of the visual zone A is located on the far vision measurement point, and the positive defocus microlenses in the far vision zone are set on the outer surface of the lens body and are evenly distributed in a fan ring with the far vision measurement point as the center. The defocus diopter of these positive defocus microlenses gradually changes from +2.50D to +6.00D from the inside to the outside.

3. The progressive defocus myopia prevention and control glasses according to claim 1, characterized in that: A near vision measurement point is set at a position 9 to 15 mm below the geometric center of the lens body and 1 to 3 mm inward from the horizontal nasal side; the center of the visual zone B is located on the near vision measurement point, and the positive defocus microlenses in the near vision zone are set on the outer surface of the lens body and are evenly distributed in a fan ring with the near vision measurement point as the center. The defocus diopter of these positive defocus microlenses gradually changes from +2.50D to +6.00D from the inside to the outside.

4. The progressive defocus myopia prevention and control glasses according to claim 1, characterized in that: The progressive channel is an area ranging from the geometric center of the lens body to the upper edge of the visual zone B of 7 to 13 mm.

5. The progressive defocus myopia prevention and control glasses according to claim 1, characterized in that: Negative defocus microlenses are distributed on the inner surface of the astigmatism area, and the defocus power of the negative defocus microlenses in the astigmatism area gradually changes from -2.50D to -6.00D along the direction from the geometric center of the lens body to the edge of the lens body.

6. The progressive defocus myopia prevention and control glasses according to claim 5, characterized in that: The boundary line between the far vision zone and the astigmatism zone is set as a first reference line, and the areas 3 to 5 mm above and below the first reference line are first transition zones. The defocus powers of the positive defocus microlenses and the negative defocus microlenses located in the first transition zone gradually transition to 0D along the direction from the edge line of the first transition zone to the first reference line; the boundary line between the near vision zone and the astigmatism zone is set as a second reference line, and the areas 3 to 5 mm above and below the second reference line are second transition zones. The defocus powers of the positive defocus microlenses and the negative defocus microlenses located in the second transition zone gradually transition to 0D along the direction from the edge line of the second transition zone to the second reference line.

7. The progressive defocus myopia prevention and control glasses according to claim 5, characterized in that: The positive defocus microlens and the negative defocus microlens are circular or elliptical. When they are circular, the diameter of the circle is 0.5 to 3 mm; when they are elliptical, the major axis is 1 to 6 mm and the minor axis is 0.5 to 3 mm.

8. The progressive defocus myopia prevention and control glasses according to claim 1, characterized in that: The value range of the lower added light ADD of the lens body is +0.50D to +1.50D.

9. The progressive defocus myopia prevention and control glasses according to claim 1, characterized in that: The diameter of the visible area A ranges from 7 mm to 10 mm, and the diameter of the visible area B ranges from 5 mm to 8 mm.

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