Saddle-shaped microstructure array eyeglass based on contrast principle

In order to more intuitively judge the relationship between the myopia prevention and control effect of the myopia prevention and control frame glasses and the microstructure parameters of the glasses, this paper designs a saddle surface microstructure array glasses based on the contrast principle, and uses the relationship between the MTF value and the microstructure parameters to establish a quantitative model. The design results show that within the acceptable imaging signal range of the human eye, the saddle surface microstructure array lens can make the light passing through the microstructure unable to converge and image, which greatly reduces the imaging contrast of the retina. When a certain spatial frequency in the range of 0~43lp/mm is selected, the maximum vector height of the microlens is in the range of 0~10μm, and the maximum vector height of the microlens and the MTF value under the maximum off-axis field of view show a nonlinear negative correlation. Therefore, the empirical formula of the maximum vector height and MTF value of the microlens of the spectacle lens is established, and the quantitative analysis of the microstructure parameters and contrast signal of the spectacle lens is completed. This work helps the lens designer to control the contrast control of myopia prevention and control more accurately through the microstructure parameters. At the same time, through analysis, it is found that in the case of relatively small light loss, compared with the spherical microstructure, the saddle surface microstructure has a better effect on reducing the contrast, which is more helpful to reduce the visual quality and slow down the development of myopia.