Using a bifocal design, there is no astigmatism, the upper area is used to see far, and the lower area is used to see close. While correcting the distant vision, the use of optical principles to change the geometric nature of the line of sight is the function of the prism, which makes the lower region look closer as if it were far away, thus relieving visual fatigue. As one of the leading optical lenses manufacturers, Crystal Optical offers OEM/ODM services. Order now for competitive myopia control lenses price.
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