I. Principles of prevention and control
Xinle Xue and Xing Fun Control belong to the latest generation of defocus lenses, that is, multi-point compound defocus, and they all use the same principle. Although the technical names are different, they are nothing more than to avoid patent restrictions, and there is no qualitative difference. All of them are aimed at solving the problem that different angles can have good myopia defocusing effect.
Second, the process comparison
The defocus of 396 spots around TAG Heuer Conservatory of Music is +3.50D, which belongs to the multi-point defocus area. The array of 396 microlenses is the defocus zone, which transmits the red light in the picture below and focuses on the B position in front of the retina. The lens except the 396 microlens array is a perfect area, which transmits the blue light in the picture below and focuses on the retina to form a clear vision.
Frame size requirements
Xinle Xue: The size of the frame is very demanding. When wearing, the pupil height should always be close to the optical center of the lens. Only in this way can the distribution of microlens and front area be 1: 1 at any angle, and the multi-point defocus plane can be used to the maximum extent.
Star fun control: the requirements for the size of the frame are not so harsh (the height of the frame can be 28~40mm). When wearing, as long as the pupil height is not too far from the optical center of the lens, the circular distribution of the star control can play a role and play a good role in prevention and control.
Suggestion: It is best to try on the physical frame in advance, and the pupil height should be close to the optical center of the lens (the horizontal line is higher, about 1/3 from the upper edge). If the pupil height deviates far, it is necessary to mark the pupil height position ("point pupil") on the frame bracket.