Far and near dual-purpose multi-point out-of-focus prismatic lens combination lens for preventing and controlling progressive myopia

Abstract

The invention discloses a far and near dual-purpose multi-point out-of-focus prismatic lens combination lens for preventing and controlling progressive myopia. The lens combination lens comprises a multi-point focusing lens, a prismatic lens combination, a base top, a base and a multi-point out-of-focus area; according to the far and near dual-purpose multipoint out-of-focus prismatic lens combination lens capable of preventing and controlling progressive myopia, a multipoint out-of-focus lens and a prismatic lens combination lens are fused into a whole, and the lower half part is of a composite structure comprising a multipoint out-of-focus part, a lens part and a prism part, wherein the multi-point defocusing and the multi-point defocusing of the upper half part are a A mold for producing the lens the prismatic lens assembly in the lower half part is a mold B for producing the lens, the mold A and the mold B are combined through a production process of a combined mold, a substrate ofthe product is produced, and the myopia prevention and control product is formed and has the effects of preventing and controlling progressive myopia of school-age children and adolescents. Meanwhile, the prismatic lens combination of the lower half part can reduce the pressure of extraocular muscles on eyeball walls when a user looks close to the eyeball walls, so that eye axis lengthening is inhibited, and growth of axial myopia is prevented and controlled.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to a dual-purpose multi-point defocus prismatic combination lens for preventing and controlling progressive myopia. Background technique [0002] In 2018, eight departments including the Health and Health Commission of the Ministry of Education jointly issued the "Implementation Plan for Comprehensive Prevention and Control of Myopia in Children and Adolescents" and proposed that by 2023, the overall myopia rate of children and adolescents across the country should be reduced by more than 0.5 percentage points per year on the basis of 2018. High-incidence provinces will reduce by more than 1 percentage point each year. By 2030, the new myopia rate of children and adolescents will be significantly reduced, and the overall level of visual health will be significantly improved. The myopia rate of 6-year-old children will be controlled at about 3%, and the myopia rate of primary school stu...

AI Technical Summary

Problems solved by technology

[0002] In 2018, eight departments including the Health and Health Commission of the Ministry of Education jointly issued the "Implementation Plan for Comprehensive Prevention and Control of Myopia in Children and Adolescents" and proposed that by 2023, the overall myopia rate of children and adolescents across the country should be reduced by more than 0.5 percentage points per year on the basis of 2018. High-incidence provinces will reduce by more than 1 percentage point each year. By 2030, the new myopia rate of children and adolescents will be significantly reduced, and the overall level of visual health will be significantly improved. The myopia rate of 6-year-old children will be controlled at about 3%, and the myopia rate of primary school students will be reduced to below 38%. The myopia rate of junior high school students has dropped to less than 60%, and the myopia rate of high school students has dropped to less than 70%. According to the monitoring results of the National Health Commission in 2019, the overall myopia rate of children and adolescents nationwide in 2018 was 53.6%, of which 36.0% were primary school students. , 71.6% of junior high school students and 81.0% of high school students. At the same time, myopia is prominent in young age groups. In the White Paper on Myopia Management (2019), the population with rapid myopia progress and the amount of progress ≥ 0.75D / year is called progressive myopia, and The proportion of progressive myopia in children and adolescents with myopia in China is very high. It is imminent to protect the vision health of children and adolescents and prevent the occurrence and development of myopia. According to the characteristics of children and adolescents' study and life, the existing single focus lenses can only Children and adolescents with myopia see the blackboard in the distance clearly, and when reading near books, because the edge power of the single focus lens is higher than the center point power, it will stimulate the adjustment and concentration of the eyes to see near, which will lead to long-term reading and writing myopia deepening

[0003] The multi-point out-of-focus lenses in the prior art can only reduce the amount of adjustment of the eyes when looking far and near, but cannot reduce the pressure on the wall of the eyeball caused by the inner leaning of the extraocular muscles when looking close, and cannot effectively relieve progressive myopia The existing progressive multifocal lens can only reduce the adjustment power of children and adolescents from looking at the blackboard in the distance to looking at the books nearby by setting the ADD value of the lens, but it cannot reduce the inner alignment of the extraocular muscles when looking at close. The pressure generated by the eyeball wall, and most children and adolescents with myopia are accompanied by exophoria, which is not suitable for the existing progressive multifocal lenses. Therefore, a single progressive multifocal lens is not effective for the prevention and control of progressive myopia. Some single prism + lens combination lenses, although they can reduce the adjustment force and the pressure of the extraocular muscles on the wall of the eyeball, but they can only be used for near vision. This kind of lens cannot see the words on the blackboard clearly, and needs to be combined A pair of glasses for far-sightedness. Most children and adolescents with myopia are students. It is inconvenient to wear glasses in the process of life and study, which will affect the wearing effect.

Images