Trial frame lens set 232

Lens, the lens is also called the center of the lens, which is the center of the drawing after being mounted, and is suitable for being clamped in the frame of the lens, so it is called the center of the lens. Its form can be horizontal or vertical, and it is a simple and convenient installation style. Lens: A piece of glass or other transparent materials with one or more curved surfaces, through which things can be observed to make things appear clear, larger or smaller. Product Advantages According to different materials, lenses can be divided into the following four types: Resin lens, special lens, space lens, glass lens, main classification, glass lens Glass lenses are more scratch-resistant than lenses of other materials, but their weight is relatively heavy, and their refractive index is relatively high: ordinary lenses are 1.523, ultra-thin lenses are: 1.72 or more, up to 2.0. The main raw material of glass lenses is optical glass. Its refractive index is higher than that of resin lenses, so under the same power, glass lenses are thinner than resin lenses. The light transmittance and mechanochemical properties of glass lenses are relatively good, with constant refractive index and stable physical and chemical properties. The colorless lens is called the optical white support (white film), and the pink film in the colored film is called the Croxel lens (red film). Croxel lenses can absorb ultraviolet light and have a slight absorption effect on strong light. The glass sheet has superior optical properties, is not easy to scratch, and has a high refractive index.