Out-of-focus surface type myopia prevention and control lens

Abstract

The invention discloses an out-of-focus surface type myopia prevention and control lens which comprises a lens body with a refraction surface, and the lens body is provided with a horizontal meridianand a vertical meridian. An optical area of the lens body is divided into a central vision area and a peripheral defocusing vision area, the central vision area is an asymmetric optical focusing area,and the peripheral defocusing vision area is divided into an upper defocusing area and a lower defocusing area by a horizontal meridian. The upper defocusing area is symmetrically distributed about the vertical meridian, the lower defocusing area is an asymmetric optical defocusing area, and the defocusing amount changes of the left side and the right side are different. And the luminosity distribution changes of the horizontal meridian and the vertical meridian are different. The lens body is provided with the central visual area and the peripheral out-of-focus visual area, a clear visual field can be formed in the central fovea of the retina through the change of luminosity distribution, myopia out-of-focus is formed around the retina, and the progress of myopia can be delayed and controlled.

Description

technical field [0001] The present application belongs to the technical field of lenses, and in particular relates to a defocused surface type myopia prevention and control lens. Background technique [0002] With the development of science and the progress of society, the load of near-distance eye use continues to increase, and the incidence of myopia in adolescents and children is getting higher and higher. In the past 60 years, the prevalence of myopia among Chinese young people has grown from 10%-20% to 90%, of which about 19.5% are high myopia. High myopia can cause irreversible damage to retinal photoreceptors, resulting in loss of central vision and blindness. Therefore, correct vision correction has become a problem that cannot be ignored in the current society. [0003] Myopia is due to the axial length of the eyeball is too long or the cornea is too curved, the eye focuses the image of a distant object in front of the retina, resulting in blurred vision. The t...

AI Technical Summary

Problems solved by technology

The anti-fatigue lens is a specified power at 3mm up from one-half of the focal point of the optical center of the lens, and the luminosity of the lens decreases by about 50 to 75 degrees when one-half goes down. Peripheral hyperopic defocus, unable to counteract prismatic effects due to rim thickness

Progressive multifocal lens is an asymmetrical design concept. There is a vertical channel in the center of the lens, and the other end of t

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