Free-form surface lens and preparation method thereof

Abstract

The invention discloses a free-form surface lens and a preparation method thereof, and the free-form surface lens comprises a first region which is located at the center of an ophthalmic lens; a first peripheral region continuously extending from the center, the first peripheral region having a refractive power different from a refractive power at the center; and a second peripheral region continuously extending from the first peripheral region and having a refractive power different from that of the first peripheral region, the continuous free-form surface power distribution having a visual efficacy substantially equivalent to that of a monocular lens, resulting in a curved surface equation F1 (X, Y, Z) = 0 of the lens body itself; obtaining a curved surface equation F2 (X, Y, Z) = 0 of the cornea surface; amplifying and superposing the curved surface F2 to the surface of the curved surface F1 to obtain a curved surface F3 (X, Y, Z) = 0; and according to the curved surface F3, 3D printing is adopted to obtain the lens. The lens prepared by the invention can correct personal low-order aberration and high-order aberration at the same time, so that the vision correction of a patient reaches an ideal state.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and in particular to a free-form surface lens and a preparation method thereof. Background Art

[0002] People's vision is prone to various problems, such as myopia, hyperopia and astigmatism. The most common method to correct patients' vision is optometry and glasses. At present, glasses such as myopia glasses and reading glasses have smooth curved surfaces and regular shapes, which can correct low-order aberrations of the eyes.

[0003] The aberrations of the eye include low-order aberrations and high-order aberrations. The myopia, hyperopia and astigmatism mentioned above are all low-order aberrations, which are the main aberrations that affect vision. High-order aberrations can also affect vision, especially in some patients, such as those after corneal transplantation and corneal trauma, whose corneal surface is not smooth but has an uneven characteristic. For example, one area may have 500 degrees of myopia, while another area may have 300 degrees of myopia. Conventional glasses cannot correct such refractive errors. Summary of the invention

[0004] The main purpose of the present invention is to provide a free-form surface lens and a preparation method thereof that can simultaneously correct an individual's low-order aberrations and high-order aberrations. Even if the patient has irregular aberrations, we can accurately obtain the parameters of the irregular aberrations and correct them, so that the patient's vision correction reaches an ideal state, which can solve the problems that ordinary glasses cannot solve clinically. In order to solve the above technical problems, the present invention discloses a free-form surface lens and a preparation method thereof, characterized in that it comprises: a first zone, the first zone is located at the center of the ophthalmic lens; a first peripheral area, the first peripheral area continuously extends from the center, and the first peripheral area has a refractive power different from the refractive power at the center; and a second peripheral area, the second peripheral area continuously extends from the first peripheral area and has a refractive power different from the refractive power of the first peripheral area, thereby providing a continuous method for slowing down, delaying or preventing the progression of myopia. Free-form surface power distribution, continuous free-form surface power distribution has visual efficacy that is basically equivalent to that of a single-vision lens, and has a focal depth and reduced retinal image quality sensitivity, the refractive power of the lens body itself is set to the refractive power of the eye, and the surface equation F1 (X, Y, Z) = 0 of the lens body itself is obtained; the surface equation F2 (X, Y, Z) = 0 of the corneal surface is obtained; the surface F2 is enlarged and superimposed on the surface of the surface F1, and the surface F3 (X, Y, Z) = 0 is obtained; based on the surface F3, the lens is obtained by 3D printing.

[0005] According to one embodiment of the present invention, the refractive power of the eye is obtained by traditional optometry means.

[0006] According to one embodiment of the present invention, the surface equation F2 of the corneal surface is obtained as follows: a longitudinal tomographic scan of the cornea is performed using corneal OCT, and the set of points obtained by the scan is fitted to the surface equation F2(X, Y, Z)=0.

[0007] According to one embodiment of the present invention, the surface equation F2 of the corneal surface obtained above is specifically: The cornea is scanned through corneal topography; the 3D model of the cornea is reconstructed based on the scanned image, thereby obtaining the surface function equation F2 of the corneal surface.

[0008] Compared with the prior art, the present application can obtain the following technical effects: 1) It can correct an individual’s low-order and high-order aberrations at the same time. Even if the patient has irregular aberrations, we can accurately obtain the parameters of the irregular aberrations and correct them, so that the patient’s vision correction reaches the ideal state, which can solve problems that ordinary glasses cannot solve clinically.

[0009] Of course, any product implementing the present invention does not necessarily need to achieve all of the above technical effects at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 It is a schematic diagram of a free-form surface lens according to an embodiment of the present application. DETAILED DESCRIPTION

[0011] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0012] Please refer to Figure 1 , Figure 1It is a schematic diagram of a free-form surface lens according to an embodiment of the present application. As shown in the figure, a free-form surface lens and a preparation method thereof are characterized in that they include: a first zone, the first zone is located at the center of the ophthalmic lens; a first peripheral area, the first peripheral area extends continuously from the center, and the first peripheral area has a refractive power different from the refractive power at the center; and a second peripheral area, the second peripheral area extends continuously from the first peripheral area and has a refractive power different from the refractive power of the first peripheral area, thereby providing a continuous free-form surface power distribution for slowing down, delaying or preventing the development of myopia, the continuous free-form surface power distribution has a visual effect that is substantially equivalent to that of a single-vision lens, and has a depth of focus and a reduced retinal image quality sensitivity, the refractive power of the lens body itself is set to the refractive power of the eye, and the surface equation F1 (X, Y, Z) = 0 of the lens body itself is obtained; the surface equation F2 (X, Y, Z) = 0 of the corneal surface is obtained; the surface F2 is enlarged and superimposed on the surface of the surface F1, and the surface F3 (X, Y, Z) = 0 is obtained; based on the surface F3, the lens is obtained by 3D printing.

[0013] Furthermore, the refractive power of the eye is obtained through traditional optometry means, and the surface equation F2 of the corneal surface is obtained as follows: the cornea is longitudinally tomographically scanned by corneal OCT, and the set of points obtained by the scan is fitted to the surface equation F2(X, Y, Z)=0.

[0014] Furthermore, the surface equation F2 of the corneal surface is obtained by: scanning the cornea through corneal topography; reconstructing the 3D model of the cornea according to the scanned image, thereby obtaining the surface function equation F2 of the corneal surface.

[0015] The lenses produced by the present invention can correct an individual's low-order aberrations and high-order aberrations at the same time. Even if the patient has irregular aberrations, we can accurately obtain the parameters of the irregular aberrations and correct them, so that the patient's vision correction reaches an ideal state, which can solve problems that ordinary glasses cannot solve clinically.

[0016] The above description shows and describes several preferred embodiments of the present application, but as before, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the present application through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present application, and shall be within the scope of protection of the claims attached to the present application.

Claims

1. A free-form surface lens and a method for preparing the same, characterized in that: include: a first zone located at a center of the ophthalmic lens; a first peripheral region extending continuously from the center, the first peripheral region having a different dioptric power than the dioptric power at the center; and a second peripheral area, which extends continuously from the first peripheral area and has a refractive power different from that of the first peripheral area, thereby providing a continuous free-form surface power distribution for slowing down, delaying or preventing the progression of myopia, wherein the continuous free-form surface power distribution has a visual effect substantially equivalent to that of a single-vision lens, and has a focal depth and reduced retinal image quality sensitivity, the refractive power of the lens body itself is set to the refractive power of the eye, and a surface equation F1 (X, Y, Z) = 0 of the lens body itself is obtained; a surface equation F2 (X, Y, Z) = 0 of the corneal surface is obtained; the surface F2 is enlarged and superimposed on the surface of the surface F1, and a surface F3 (X, Y, Z) = 0 is obtained; based on the surface F3, the lens is obtained by 3D printing.

2. The free-form surface lens and the method for preparing the same according to claim 1, wherein the refractive power of the eye is obtained by traditional optometry means.

3. The free-form surface lens and the method for preparing the same according to claim 1, wherein: The surface equation F2 of the corneal surface is obtained specifically as follows: a longitudinal tomographic scan of the cornea is performed by corneal OCT, and the point set obtained by the scan is fitted to the surface equation F2(X, Y, Z)=0.

4. The free-form surface lens and the method for preparing the same according to claim 1, wherein: The surface equation F2 of the corneal surface is specifically: The cornea is scanned through corneal topography; the 3D model of the cornea is reconstructed based on the scanned image, thereby obtaining the surface function equation F2 of the corneal surface.

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