The application of vacuum coating machine coating technology to optical lenses, the earliest lenses did not have optical coating, and some even did not have the matting inside the lens barrel and the blackening of the edge of the lens, and then a single-layer coating appeared, but this was mainly used In military telescopes, it is used to achieve lens extinction and reduce the possibility of being discovered by the enemy (for example, Zeiss Dingding’s T* coating was first developed for military use). In the field of civilian cameras, 1941 Kodak produced the first coated lens Camera Ektra, but the great development of coating technology should be counted from Pentax's SMC-coated too bad horse lens in the early 1970s.

         The coating on modern lenses can be divided into two types. One is called antireflection coating, which increases the light transmittance, while the other coating changes the color spectrum transmission characteristics of the lens, such as a lens. Although the refractive index and other indicators of the optical material used in a certain lens are very good, but there is a yellowish phenomenon, then coat it with a spectrum blocking film to correct the color cast back (the three Princesses of Pentax use high refractive Glass, so it is slightly yellowish), and now the development of coating technology can compensate for the shortcomings of some relatively cheap optical materials. The design of the lens no longer needs to use expensive special formula optical glass to complete as in the past, so the new In general, the lens of each lens has a multi-layer coating on the air contact surface, which also highlights the important role of the coating on the lens from another aspect. Nowadays, the application of coating machine on optical lens is generally called optical vacuum coating machine or optical lens coating machine.

         When many people wear glasses, they require a film on the lenses. There are two main types of optical coating machines for coating lenses: one is anti-reflection coating, that is, by coating the front surface of the lens with multiple layers of transparent materials with different refractive indices and different thicknesses, and using the principle of light interference to reduce the excess on the surface reflected light. After the anti-reflective film is added to the lens, the light permeability will increase, the wearer feels that the glare is reduced, and the vision is more real and bright. The other is hard coating, which is mainly used for resin lenses. It is generally added on the front surface of the lens to enhance the abrasion resistance of the resin lens and at the same time enhance the light permeability. When cleaning the hard-coated lens, the user should first wash the front and back surfaces of the lens with clean water, and then dry it with a clean soft cloth. Be careful not to wipe the lens when it is dry. If the ordinary lens can be seen clearly, there is no need to add a film. If you want to add, the resin lens can be added with an anti-reflective film or a hard film. The glass lens generally only has an anti-reflective film.