Off-focus lens
By introducing peripheral defocus zones and intermediate refractive correction zones with different defocus amounts into the lens design, the problem of insufficient adaptability of myopia defocus lenses is solved, the effective time for preventing myopia progression is extended, and the cost of use is reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHANGZHOU AOJIE OPTICAL TECH CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-12
AI Technical Summary
Existing myopic defocus lenses have a fixed defocus amount, which leads to adaptation problems for teenagers after wearing them for a long time. They cannot effectively prevent myopia from worsening, and frequent lens replacements increase usage costs.
A defocused lens is designed, comprising a central refractive correction zone, a peripheral defocus zone, and a peripheral lens area. The peripheral defocus zone has first and second defocus zones with different defocus amounts. Adaptability is improved through the design of the microlens portion. The diameter of the central refractive correction zone is matched with the density of photoreceptor cells in the human eye to improve visual clarity.
It extends the effective time for preventing myopia progression, reduces the replacement cycle of glasses for teenagers, and lowers the cost of use.
Smart Images
Figure CN224354675U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lenses, and in particular to a defocus lens. Background Technology
[0002] Existing monofocal lenses can correct vision and provide patients with an immediate clear field of vision. However, they have a fatal flaw: when light enters the eye, the image of the central focal point is projected onto the retina, while the peripheral images are projected behind the retina, creating hyperopic defocus, which may lead to a continuous increase in myopia. Therefore, myopic defocus lenses have been developed. These lenses not only ensure that the image of the central focal point is projected onto the retina, but also project peripheral images in front of the retina through peripheral defocus areas. This avoids the eye's own accommodation from elongating the axial length, ultimately preventing the progression of myopia.
[0003] However, existing myopia defocus lenses all have a fixed defocus amount. If teenagers wear them for a long time, they may experience adaptation problems, meaning the myopia defocus lens will no longer be effective in preventing myopia progression. Therefore, teenagers generally need to change to lenses with different defocus amounts after wearing them for a period of time to ensure the effect of preventing myopia progression; this increases the cost for users.
[0004] In view of the above problems, it is necessary to study a defocused lens that has a long effective time in preventing the progression of myopia and helps to reduce the cost of use for adolescent users. Utility Model Content
[0005] The purpose of this invention is to provide a defocused lens that has a long effective time in preventing the progression of myopia and helps reduce the cost of use for teenagers.
[0006] To achieve the above objectives, the solution of this utility model is:
[0007] A defocusing lens includes a lens body, which comprises, from the center outwards, a central refractive correction zone, a peripheral defocusing zone, and a peripheral lens area. The central refractive correction zone has a refractive power prescribed for correcting refractive errors in vision, and its diameter is 6 to 12 mm. The peripheral defocusing zone includes a first defocusing zone and a second defocusing zone arranged sequentially from the inside out along the diameter of the lens body. Both the first and second defocusing zones include multiple rings of microlenses, and each ring of microlenses includes multiple microlenses arranged in a ring around the center of the lens body. The defocusing amounts of the first and second defocusing zones are different.
[0008] The defocus amount in the first defocus zone is greater than the defocus amount in the second defocus zone.
[0009] The defocus amount in the first defocus zone is 4.50±0.30D, and the defocus amount in the second defocus zone is 4.00±0.30D.
[0010] The microlenses in the peripheral defocus area are distributed in a scattering pattern about the center of the lens body.
[0011] The area of each microlens in the peripheral defocus zone accounts for 43.50±0.5% of the total area of the lens body.
[0012] The number of microlenses in each ring is 24.
[0013] The total number of microlens units in the peripheral defocus area is 22.
[0014] The diameters of the microlenses in the first defocus region are not exactly the same, and the diameters of the microlenses in the second defocus region are not exactly the same.
[0015] The diameter of the microlens portion is 1.0mm~1.4mm.
[0016] The diameter of the intermediate refractive correction zone is 7.2 mm.
[0017] After adopting the above solution, this utility model has the following characteristics:
[0018] 1. The defocused lens of this utility model has a first defocused area and a second defocused area with different defocusing amounts. This setting can improve the adaptation time of the human eye to the defocused lens of this utility model, thereby making the effective time of the defocused lens of this utility model in preventing myopia progression longer, thus reducing the replacement cycle of glasses for teenagers and helping to reduce the usage cost for teenagers.
[0019] 2. The diameter of the intermediate refractive correction zone of the defocus lens of this utility model is 6 to 12 mm. This setting corresponds to the preferred range of photoreceptor cell density in the human eye, thereby improving the clarity of the corrected vision. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of this utility model (the dashed lines are the dividing lines between different areas, which do not actually exist).
[0021] Figure 2 for Figure 1 Enlarged view of point A (the dashed line is the boundary line between different areas, which does not actually exist).
[0022] Label Explanation:
[0023] Lens body A,
[0024] The lens has a central refractive correction zone 1, a peripheral defocus zone 2, a microlens portion 20, a first defocus zone 21, a second defocus zone 22, and a peripheral lens area 3. Detailed Implementation
[0025] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.
[0026] like Figure 1 and Figure 2 As shown, this utility model discloses a defocus lens, including a lens body A. From the center outwards, the lens body A consists of a central refractive correction zone 1, a peripheral defocus zone 2, and a peripheral lens zone 3. The central refractive correction zone 1 has a refractive power of a prescription for correcting visual refractive errors.
[0027] In the embodiments of this utility model, the diameter D1 of the intermediate refractive correction zone 1 is 6 to 12 mm. This setting corresponds to the preferred range of photoreceptor cell density in the human eye, thereby improving the clarity of the corrected visual acuity. The diameter D1 of the intermediate refractive correction zone 1 is preferably 7 to 7.2 mm.
[0028] In an embodiment of this invention, the peripheral defocus zone 2 includes a first defocus zone 21 and a second defocus zone 22 arranged sequentially from the inside to the outside along the diameter direction of the lens body A. Both the first defocus zone 21 and the second defocus zone 22 include multiple rings of microlens portions 20, each ring of microlens portions 20 including multiple microlens portions 20 arranged in a ring around the center of the lens body A. The defocus amounts of the first defocus zone 21 and the second defocus zone 22 are different. This arrangement can improve the adaptation time of the human eye to the defocus lens of this invention, thereby extending the effective time of the defocus lens in preventing myopia progression, and thus reducing the replacement cycle for adolescent users and helping to reduce the usage cost for them. Specifically, the defocus amount of the first defocus zone 21 is greater than that of the second defocus zone 22. The defocus amount of the first defocus zone 21 can be 4.50±0.30D, and the defocus amount of the second defocus zone 22 can be 4.00±0.30D.
[0029] In an embodiment of this utility model, the area ratio (i.e., defocus fill rate) of each microlens portion 20 in the peripheral defocus area 2 to the lens body A can be 43.50±0.5%; this setting can obtain a larger effective defocus area while minimizing the impact on visual quality.
[0030] In an embodiment of this utility model, as shown in the figure, each microlens portion 20 in the peripheral defocus area 2 is distributed in a scattering manner about the center of the lens body A. The total number of circles of microlens portions 20 in the peripheral defocus area 2 can be 22 circles, and the number of microlens portions 20 in each circle can be 24.
[0031] In the embodiments of this utility model, as shown in the figures, the diameters of the microlens portions 20 in the first defocus region 21 are not entirely the same, and the diameters of the microlens portions 20 in the second defocus region 22 are also not entirely the same; this arrangement helps to reduce the deepening of astigmatism. The diameter D2 of the microlens portion 20 can be 1.0mm to 1.4mm.
[0032] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.
Claims
1. A defocus lens, comprising a lens body, wherein the lens body comprises, from the center outwards, a central refractive correction zone, a peripheral defocus zone, and a peripheral lens area, wherein the central refractive correction zone has a refractive power prescribed for correcting refractive errors of vision, characterized in that: The diameter of the intermediate refractive correction zone is 6 to 12 mm; The peripheral defocus zone includes a first defocus zone and a second defocus zone arranged sequentially from the inside to the outside along the diameter of the lens body. Both the first and second defocus zones include multiple rings of microlenses, and each ring of microlenses includes multiple microlenses arranged in a ring around the center of the lens body. The defocus amount of the first and second defocus zones is different.
2. The defocus lens as described in claim 1, characterized in that: The defocus amount in the first defocus zone is greater than the defocus amount in the second defocus zone.
3. The defocus lens as described in claim 1 or 2, characterized in that: The defocus amount in the first defocus zone is 4.50±0.30D, and the defocus amount in the second defocus zone is 4.00±0.30D.
4. The defocus lens as described in claim 1, characterized in that: The microlenses in the peripheral defocus area are distributed in a scattering pattern about the center of the lens body.
5. The defocus lens as described in claim 1, characterized in that: The area of each microlens in the peripheral defocus zone accounts for 43.50±0.5% of the total area of the lens body.
6. The defocus lens as described in claim 1, characterized in that: The number of microlenses in each ring is 24.
7. The defocus lens as described in claim 1 or 6, characterized in that: The total number of microlens units in the peripheral defocus area is 22.
8. The defocus lens as described in claim 1, characterized in that: The diameters of the microlenses in the first defocus region are not exactly the same, and the diameters of the microlenses in the second defocus region are not exactly the same.
9. The defocus lens as described in claim 8, characterized in that: The diameter of the microlens portion is 1.0mm~1.4mm.
10. The defocus lens as described in claim 1, characterized in that: The diameter of the intermediate refractive correction zone is 7.2 mm.