Three-focal-length functional lens
By designing multiple concentric main focal length areas of the triple focal length functional lens, the problem that existing lenses cannot correct hyperopic defocusing and cannot form multiple focus points in front and back of the retina is solved, achieving better myopia correction effect.
Patent Information
- Application Number
- CN202421252317.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-06-04
AI Technical Summary
In the existing lens design, the main focal length is only located in the center of the lens, which cannot effectively correct hyperopic defocusing, and cannot form multiple focus points in front and behind the retina, limiting the ability to correct myopia.
A triple focal length functional lens is designed, including a front optical surface and a rear optical surface, forming a plurality of concentric main focal length regions, including a first refractive region, a second refractive region and a third refractive region, through which light is realized Focusing on the retina, front or back forms an axial focus spatial distribution.
The distribution of multiple main focal lengths is achieved, which not only corrects hyperopic defocusing, but also forms image stretching between the front and back of the retina, improving the lens's management effect on myopia without adding additional microstructures.
Smart Images
Figure CN222337412U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a lens, in particular to a three-focal length functional lens. Background Art
[0002] With the rapid development of the eyewear industry, higher requirements have been put forward for the lightweight, functionality, comfort and novelty of eyewear. The development of aspheric and free-form surface technology has increased the freedom of eyewear lens design and processing, and can control the vertex power distribution and cylindrical vertex power distribution to the maximum extent according to the artificially set requirements. Except for progressive multifocal lenses, the current eyewear lenses basically have only one main focal length (main refractive power) for correcting vision, especially myopia management lenses have only one main focal length (main refractive power) located in the center of the lens for sufficient correction of vision. Even if the local refractive power of such lenses is changed by adding microlenses, there is still only one main refractive power. With the development of the theory that hyperopic defocus is the main reason for the increase of myopia, the lens design theory of whether the refractive power of the lens base can partially or completely correct hyperopic defocus needs to be developed. Aspheric and free-form surfaces can achieve a difference between the edge and center refractive power, but there is only one refractive power located in the center for sufficient correction of vision, which cannot correct hyperopic defocus, and the position of the retina is mainly in the imaging on the retina. Utility Model Content
[0003] Purpose of the utility model: The purpose of the utility model is to propose a trifocal functional lens to achieve multiple main focal lengths, and to achieve imaging in front of and behind the retina and on the retina, or to simultaneously image at multiple positions to form a focal space distribution, which can correct hyperopic defocus and form a stretching of the front and back images of the retina.
[0004] Technical solution: The utility model includes a front optical surface and a rear optical surface, the front optical surface and the rear optical surface constitute an optical refraction zone, the optical refraction zone is provided with a plurality of main focal length zones, including a first refraction zone, a second refraction zone and a third refraction zone, the first refraction zone, the second refraction zone and the third refraction zone are concentrically arranged from inside to outside, when light passes through the first refraction zone, it is focused on the retina, when light passes through the second refraction zone and the third refraction zone, it is focused in front of the retina or behind the retina, and the focusing position of the third refraction zone is different from the focusing position of the second refraction zone.
[0005] The central refractive power of the first refractive zone is greater than or less than the central refractive power of the second refractive zone.
[0006] The central refractive power of the third refractive zone is greater than or less than the central refractive power of the second refractive zone.
[0007] The central diopter of the first refractive zone ranges from -10D to +10D, wherein the central diopter is located at the center of the first refractive zone, and the absolute value of the diopter variation range from the center of the first refractive zone to the edge of the first refractive zone is less than 0.1D.
[0008] The central diopter of the second refractive zone ranges from -10D to +10D, wherein the central diopter is located at the regional center of the second refractive zone, and the absolute value of the diopter variation range from the regional center of the second refractive zone to the regional edge of the second refractive zone should be less than 3D.
[0009] The central diopter of the third refractive zone ranges from -10D to +10D, wherein the central diopter is located at the regional center of the third refractive zone, and the absolute value of the diopter variation range from the regional center of the third refractive zone to the regional edge of the third refractive zone should be less than 4D.
[0010] The first refractive zone occupies 10% to 50% of the entire lens area, the second refractive zone occupies 5% to 45% of the entire lens area, and the third refractive zone occupies 5% to 45% of the entire lens area.
[0011] The front optical surface is a surface away from the human eye, and the rear optical surface is a surface close to the human eye. The surface shapes of the front optical surface and the rear optical surface are aspherical surfaces or free-form surfaces.
[0012] Beneficial effects: The utility model can achieve multiple main focal lengths. The first refractive zone is used for sufficient vision correction and imaging is performed on the retina; the second refractive zone is used for imaging in the front and back positions of the retina; the third refractive zone is used for imaging in the front and back positions of the retina, and the imaging position is different from that of the second refractive zone; through the three main focal length zones, imaging forms an axial focus space distribution, which can correct hyperopic defocus and form a stretching of the front and back images of the retina, thereby better realizing the management of myopia by the lens without adding additional special microstructures. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a side view of the utility model;
[0014] Figure 2 It is the front view of the utility model;
[0015] Figure 3 This is a practical three-diopter focusing effect - in front and behind the retina;
[0016] Figure 4 This is a practical three diopter focusing effect - pre-retinal. DETAILED DESCRIPTION
[0017] The utility model will be further described below in conjunction with the accompanying drawings.
[0018] like Figure 1 and Figure 2 As shown, the trifocal functional lens of the present invention comprises a front optical surface 1 and a rear optical surface 2. The front optical surface 1 is a surface away from the human eye, and its surface shape can be an aspherical surface or a free-form surface. The rear optical surface 2 is a surface close to the human eye, and its surface shape can be an aspherical surface or a free-form surface.
[0019] The front optical surface 1 and the rear optical surface 2 are combined to form an optical refraction area, and the optical refraction area is provided with a plurality of main focal length areas. In this embodiment, three main focal length areas are provided, such as Figure 2 As shown, it includes a first refraction zone 3, a second refraction zone 4, and a third refraction zone 5. The first refraction zone 3, the second refraction zone 4, and the third refraction zone 5 are concentrically arranged from the inside to the outside. The first refraction zone 3 is a central refraction zone, the second refraction zone 4 is an intermediate refraction zone, and the third refraction zone 5 is an edge refraction zone. The first refraction zone 3 occupies 10% to 50% of the entire lens area, the second refraction zone 4 occupies 5% to 45% of the entire lens area, and the third refraction zone 5 occupies 5% to 45% of the entire lens area.
[0020] The central diopter of the first refraction zone 3 may be greater than or less than the central diopter of the second refraction zone 4 , and the central diopter of the third refraction zone 5 may be greater than or less than the central diopter of the second refraction zone 4 .
[0021] The central diopter of the first refractive zone 3 ranges from -10D to +10D, and the central diopter is located at the center of the first refractive zone 3. The absolute value of the diopter variation range from the center of the first refractive zone 3 to the edge of the first refractive zone 3 should be less than 0.1D. When light passes through the first refractive zone 3, it is focused on the retina 6. Figure 3 and Figure 4 shown.
[0022] The central diopter of the second refractive zone 4 ranges from -10D to +10D, and the central diopter is located at the center of the second refractive zone 4. This area makes the light not focus on the retina 6, but can focus in front of the retina 6 or behind the retina 6, such as Figure 3 and Figure 4 As shown, the absolute value of the diopter variation range from the center of the second refractive zone 4 to the edge of the second refractive zone 4 should be less than 3D.
[0023] The central diopter of the third refractive zone 5 ranges from -10D to +10D, and the central diopter is located at the center of the third refractive zone 5. This area makes the light not focus on the retina 6, but can focus in front of the retina 6 or behind the retina 6, and the focusing position is different from the focusing position of the second refractive zone 4. Figure 3 and Figure 4 As shown, the absolute value of the diopter variation range from the center of the third refraction zone 5 to the edge of the third refraction zone 5 should be less than 4D.
[0024] Example 1
[0025] like Figure 1 and Figure 2 As shown, the three-focal length functional lens of the utility model comprises a front optical surface 1 and a rear optical surface 2. The optical refractive zone is composed of three main focal length zones, namely the first refractive zone 3, the second refractive zone 4, and the third refractive zone 5. The central refractive power of the first refractive zone 3 is -3.0D, the central refractive power of the second refractive zone 4 is -2.0D, and the central refractive power of the third refractive zone 5 is +1.0D. The first refractive zone 3 occupies 40% of the entire lens area, the second refractive zone 4 occupies 30% of the entire lens area, and the third refractive zone 5 occupies 30% of the entire lens area. The absolute value of the refractive power variation range of the first refractive zone 3 from the center of the area to the edge of the area should be less than 0.1D. When light passes through the first refractive zone, it is focused on the retina 6. Figure 3 The absolute value of the diopter variation range of the second refractive zone 4 from the center of the area to the edge of the area is less than 1D, and the focus is in front of the retina 6, as shown in FIG. Figure 3 The absolute value of the diopter variation range of the third refractive zone 5 from the center of the area to the edge of the area is less than 2D, and the focus is behind the retina 6, as shown in FIG. Figure 3 The first refraction zone 3, the second refraction zone 4 and the third refraction zone 5 are concentrically distributed and are circular in shape.
[0026] Example 2
[0027] like Figure 1 and Figure 2 The utility model has a three-focal length functional lens, comprising a front optical surface 1 and a rear optical surface 2. The optical refractive zone is composed of three main focal length zones, namely the first refractive zone 3, the second refractive zone 4, and the third refractive zone 5. The central refractive power of the first refractive zone 3 is -4.0D, the central refractive power of the second refractive zone 4 is -2.5D, and the central refractive power of the third refractive zone 5 is -1.0D. The first refractive zone 3 occupies 40% of the entire lens area, the second refractive zone 4 occupies 30% of the entire lens area, and the third refractive zone 5 occupies 30% of the entire lens area. The absolute value of the refractive power variation range of the first refractive zone 3 from the center of the area to the edge of the area should be less than 0.1D. When light passes through the first refractive zone, it is focused on the retina 6. Figure 4 The absolute value of the diopter variation range of the second refractive zone 4 from the center of the area to the edge of the area is less than 2D, and is focused in front of the retina 6, as shown in FIG. Figure 4 The absolute value of the diopter variation range of the third refractive zone 5 from the center of the area to the edge of the area is less than 1D, and it is focused in front of the retina 6, and the focusing position is different from the focusing position of the second refractive zone, as shown in FIG. Figure 4 The first refraction zone 3, the second refraction zone 4 and the third refraction zone 5 are concentrically distributed and have an elliptical shape.
[0028] The utility model proposes a three-focal length functional lens, which can achieve three main focal lengths (main diopters) distributions. The first refractive zone is used for full vision correction and imaging on the retina; the second refractive zone is used for imaging in the front and back positions of the retina; the third refractive zone is used for imaging in the front and back positions of the retina, and the imaging position is different from that of the second refractive zone. Through the three main focal length (diopters) zones, imaging forms an axial focus space distribution, which can not only correct hyperopic defocus, but also form a stretching of the front and back images of the retina, so as to better achieve the management of myopia by the lens.
Claims
1. A trifocal functional lens, characterized in that: The invention comprises a front optical surface and a back optical surface, wherein the front optical surface and the back optical surface constitute an optical refraction zone, wherein the optical refraction zone is provided with a plurality of main focal length zones, including a first refraction zone, a second refraction zone and a third refraction zone, wherein the first refraction zone, the second refraction zone and the third refraction zone are concentrically arranged from inside to outside, and when light passes through the first refraction zone, it is focused on the retina, and when light passes through the second refraction zone and the third refraction zone, it is focused in front of the retina or behind the retina, and the focusing position of the third refraction zone is different from the focusing position of the second refraction zone.
2. The trifocal functional lens according to claim 1, characterized in that: The central refractive power of the first refractive zone is greater than or less than the central refractive power of the second refractive zone.
3. The trifocal functional lens according to claim 2, characterized in that: The central refractive power of the third refractive zone is greater than or less than the central refractive power of the second refractive zone.
4. The trifocal functional lens according to claim 1, characterized in that: The central diopter of the first refractive zone ranges from -10D to +10D, wherein the central diopter is located at the center of the first refractive zone, and the absolute value of the diopter variation range from the center of the first refractive zone to the edge of the first refractive zone is less than 0.1D.
5. The trifocal functional lens according to claim 4, characterized in that: The central diopter of the second refractive zone ranges from -10D to +10D, wherein the central diopter is located at the regional center of the second refractive zone, and the absolute value of the diopter variation range from the regional center of the second refractive zone to the regional edge of the second refractive zone should be less than 3D.
6. The trifocal functional lens according to claim 5, characterized in that: The central diopter of the third refractive zone ranges from -10D to +10D, wherein the central diopter is located at the regional center of the third refractive zone, and the absolute value of the diopter variation range from the regional center of the third refractive zone to the regional edge of the third refractive zone should be less than 4D.
7. The trifocal functional lens according to claim 1, characterized in that: The first refractive zone occupies 10% to 50% of the entire lens area, the second refractive zone occupies 5% to 45% of the entire lens area, and the third refractive zone occupies 5% to 45% of the entire lens area.
8. The trifocal functional lens according to claim 1, characterized in that: The front optical surface is a surface away from the human eye, and the rear optical surface is a surface close to the human eye. The surface shapes of the front optical surface and the rear optical surface are aspherical surfaces or free-form surfaces.