How is myopia lens made?

Myopic lenses are usually made of resin and processed into a certain size and thickness. The size of the lens is generally fixed, but the thickness of the lens is determined by the degree of myopia.

Resin lens is an organic material, and its interior is a polymer chain structure, which is interconnected to form a three-dimensional network structure. The intermolecular structure is relatively relaxed, and there is room for relative displacement between molecular chains. The light transmittance is 84%-90%, and the optical resin lens has good light transmittance and strong impact resistance. Resin is a kind of hydrocarbon secretion from many plants, especially conifers. Because of its special chemical structure, it can be used as latex paint and adhesive. Because it is a mixture of various polymer compounds, its melting point is also different. Resin can be divided into natural resin and synthetic resin. There are many kinds of resins, which are widely used in light and heavy industries and can often be seen in daily life, such as plastic, plexiglass, paint and so on. Resin lens is a kind of lens which is chemically synthesized from resin and polished. In the visible region, the transmittance of resin lens is close to that of glass; Infrared region, slightly higher than glass; In the ultraviolet region, the transmittance decreases with the decrease of wavelength from 0.4um, and the light with wavelength less than 0.3um is almost completely absorbed, so the ultraviolet transmittance is poor.

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