The eye is a refractive system, when the eyes appear refractive error, that is, when there is farsightedness or myopia, Free Try On Glasses can be considered to improve vision. Glasses is a transparent refractive medium, which is divided into spherical lens, cylindrical lens and spherical lens. Convex lens is divided into convex lens and concave lens, convex Free Prescription Glasses lens is equivalent to farsightedness lens, can make parallel rays or scattered rays to a certain extent, after refraction to the center convergence. In hyperopia, the light is refracted in the back of the retina, so the convex lens can make the focus of the light move forward, just fall on the retina, and the object image can be clear.
A concave lens is a myopic Buy Lenses For Glasses. The refractive function of the concave lens is to make the parallel rays, or the scattered rays to a certain extent, disperse after passing through the concave lens. Myopia is because the parallel light after refractive refraction in front of the retina, through the refraction of a concave Eyeglass Lenses Online, the focus will move back to fall on the retina, that is, clear imaging.
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