Digital doublet lens

Abstract

The invention discloses a digital doublet lens. The lens is characterized by comprising an upper light area, a middle area and a lower light area, wherein the upper light area and the lower light areaare respectively provided with an optical center, the middle area is a gradient change zone, the lower light area is a near light area, and the upper light area is a far light area; the distance fromthe optical center of the upper light area to the geometric center is 4-8 mm, the effective light area is 120-160 degrees, the distance from the optical center of the lower light area to the geometric center is 12-16 mm, the width of the effective light area is 20-28 mm, the distance from the assembly cross of the lens to the geometric center is 2-4 mm, the lens is located in the upper light area, and the upper light area, the middle area and the lower light area are respectively symmetrical left and right. The invention has the advantages that: the long-distance use area of the doublet lensprovided by the invention can reach 120-160 degrees of wide view field; in the lens, the degree of near-use changes along with the change of the degree of far-use, and each degree of near-use has a corresponding convex lens value so as to reduce the degree of near-use and be more accurate, thereby solving the problem of eye adjustment lag caused by long-time near-use, relieving eye fatigue and relieving intraocular pressure.

Description

technical field [0001] The invention belongs to the field of glasses, and in particular relates to a digital twin lens. Background technique [0002] At present, there are many types of lenses for the prevention and control of students' myopia on the market, which can basically be summarized as: progressive multi-focal lenses, defocus lenses, ring focus (all-focus) lenses, etc.; these lenses have their own advantages and disadvantages. [0003] 1: Progressive multi-focal: the market and general use a fixed ADD value, and add a certain degree of ADD value to the light area under the lens, so as to relieve eye fatigue when using the eye at close range; [0004] But its disadvantage is that different far-sighted luminosities basically use one or two ADD values ​​(add150add175) to change the near-use power in order to achieve the effect of adjusting the near-use power. Degree of myopia (and different add values); [0005] At the same time, the width of the effective area of ​​...

AI Technical Summary

Problems solved by technology

[0008] 2: Defocus lens: The principle is that the optical center of the frame lens is imaged behind the retina, forcing the eye axis to extend backward. To solve this situation, a certain positive degree will be added to the periphery of the optical center of the lens to reduce its lens. The peripheral degree of the lens makes the light around the lens (the periphery of the optical center) enter the front or upper part of the retina; the defocus lens only solves the imaging problem around the lens. According to the cause of students' myopia, in addition to factors such as genetics, the main factor is long-term Excessive use of eyes at close range causes eye fatigue, and long-term eye fatigue forces myopia to further deepen; defocus lenses are essentially single-focal lenses; The angle of eye fatigue solves the problem of myopia deepening

[0009] 3: Ring focus (full focus) lens; from the perspective of optical design, it is only a single focus aspheric lens, and it is even more impossible to solve the problem of myopia and nearsightedness.

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