Inner progressive is a lens production process, which refers to a progressive multifocal lens that uses free-form surface technology to process the progressive belt of progressive multifocal lens on the inner surface of lens through digital lathe processing equipment.
In the manufacturing of progressive lens glasses, the curvature of the front surface of the lens is continuously increased from the top to the bottom, which can change the diopter accordingly, that is, the diopter is gradually and continuously increased from the remote area at the upper part of the lens until the near area at the bottom of the lens reaches the required near diopter. In this way, the position of the lens from top to bottom corresponds to the luminosity of seeing far, right and near respectively, so that the vision at different distances such as far use and near use can be corrected on the same lens.
Classification of progressive film (by progressive band) according to the progressive photometric distribution position of progressive multifocal lens, progressive film can be divided into outer surface progressive, inner surface progressive and double-sided progressive. With regard to the inner progressive inner progressive lens, through the free-form surface lathe processing equipment, the photometric change of the lens is made on the inner surface of the lens, and the eyeball is closer to the channel of the lens, so as to expand the horizontal field of vision of the lens, reduce the shaking motion on both sides when the lens is worn, make the inner progressive lens easy to adapt and have a wide field of vision, and effectively solve the problem of the traditional outer progressive field of vision.
Generally speaking, SPH photometric stability inner progressive lens is manufactured by advanced free-form surface technology. The photometric design of the lens is reasonable, which can bring more stable visual effects and wearing experience to users. Easy to adapt inner progressive lens because it is closer to the eyeball, the shaking motion of both sides of the lens is smaller after wearing, which reduces the discomfort of the first wearer and makes it easier to adapt, so that users who have never worn glasses can quickly master the use method.
Intra application gradualism and intra adolescent gradualism are not only the patents of middle-aged and elderly people. Teenagers can also use gradualism tablets to correct vision and alleviate fatigue, so as to alleviate the development of myopia. While correcting the vision of teenagers, students’ reading and writing gradually reduce the adjustment of close eye use through adding light under the lens, alleviate the fatigue caused by long-time close eye use, and effectively slow down the deepening of myopia. At the same time, the progressive design of the inner surface provides students with a broader vision and more comfortable wearing.
Internal progression and anti fatigue anti fatigue internal progression is a functional lens specially designed for office people. The refractive characteristics of these people are that after a long time of close eye use, they will have various discomfort symptoms, such as visual fatigue, eye soreness and pain, head pain, etc. Through the special design of the lower part of the lens, the anti fatigue gradually reduces the eye fatigue caused by long-term close vision, alleviates various visual fatigue symptoms, and makes the indoor office easy and comfortable. Inner progressive and middle-aged and old-aged inner progressive adopt the latest free-form surface removal technology, which can not only correct the long-term vision of middle-aged and old people, but also improve the near-term vision, and provide a broader field of vision than ordinary progressive, which is easier to adapt, making it easier to wear progressive films.
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