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Main classification of spectacle lenses
Sep 11, 2017

Glass Lenses

Glass lenses, with other materials than the characteristics of the lens more resistant to scraping, but the relative weight is also heavier, the refractive index is relatively high: the common film is 1.523, the ultra-thin sheet is: 1.72 above, up to 2.0.

The main raw material of glass lenses is optical glass. The refractive index is higher than the resin lens, so the glass lens is thinner than the resin lens in the same degree. The transmittance and mechanical properties of glass lenses are good, with constant refractive index and stable physical and chemical properties. Lenses without color are called optical buttermilk (white), and the pink film in the colored film is called the Ryan Game Lens (Red film). Crocker's lenses absorb ultraviolet rays and have a slightly absorbing effect on strong light.

Glass optical properties Superior, not easy to delimit flowers, high refractive index. The higher the refractive index, the thinner the lens. But the glass piece is fragile, the material is biased.

Resin Lenses

Resin is a kind of hydrocarbon (hydrocarbon) secretion from many kinds of plants, especially conifers. Because of its special chemical structure and can be used for this latex paint and adhesives are valued. It is a mixture of multiple polymers, so there are different melting points. Resin can be divided into natural resin and synthetic resin two kinds. Resin species are very much, widely used in people's light industry and heavy industry, in the daily life is often seen, such as plastic, resin glasses, paint and so on. Resin lenses are used for the chemical processing of raw materials to synthesize polished lenses.

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