The lens is a disposable product. Once the processing is completed, it cannot be modified. In order to avoid preventable losses, the lens should be carefully considered when making the right choice.

　　The color of the lens

　　 High visual requirements for eyesight, color and distance and stable work, such as students, cars Drivers, surgeons, art workers, etc. should choose colorless and transparent lenses. If the driver of a car wears heavy-colored lenses, he is not sensitive to distance changes, and the distance judgment is inaccurate, which may cause accidents.

　　The shape of the lens

　　 After selecting the frame, the shape of the lens is selected.

　　Transmittance of lens

　　Optical lens The light transmittance of the aspherical ultra-thin optical spectacle lens is better.

　　The thickness of the lens

　　 is related to the size of the lens diopter , Is related to the refractive index of the lens, related to the size and shape of the frame, related to the size of the pupil distance and the amount of shift center, related to the astigmatism axis, and related to the nature of the lens (concave and convex).

　　The weight of the lens

　　 is related to the lens material, and the glass lens is heavier than the resin lens. For the same lens material, the larger specific gravity is heavier than the smaller specific gravity, and the larger volume is heavier than the smaller volume (related to the lens power and shape size).

　　Glass lenses are harder than resin optical lenses and are more wear-resistant.

　　 lens strength

　　 resin lens is better than glass lens High strength, impact resistance and not fragile.

　　Special functions of the lens

　　 such as anti-ultraviolet, anti-electromagnetic radiation, anti-infrared, high temperature resistance, oil resistance, acid resistance Alkali, anti-dispersion, anti-deformation (ultra-thin aspheric lens), anti-glare and other functions. Such as electric and gas welding lenses, computer lenses, underwater lenses, fishing lenses, etc. are different.

The maintenance principle of 　　 resin lens is to keep the lens bright and clean, free from oil stains, and avoid scratches. It is best to rinse the lenses with tap water before wiping them, or use neutral soap or a special focusing lens cleaner. After washing them with water, wipe them with special lenses. To clean the crevices between the frames, you can use a soft old toothbrush to gently scrub to remove dirt.

　　How to clean resin lens

　　 In daily life, try to avoid resin lens contact with high temperature, because high temperature will cause The thermal expansion and contraction of the film layer and the resin lens substrate are inconsistent, causing the film layer to be damaged or even fall off. In addition, avoid contacting the resin lens with strong organic solvents, such as acetone, ether and perfume, because these organic solvents will affect the surface finish of the resin lens. In addition, the way of placing the glasses should also develop a fixed habit. First wrap the resin lens with aspheric lens flannel, and then close the temples. To prevent the glasses from being stressed, the glasses can be placed in a hard glasses storage box.

　　1. When wearing glasses, do not touch the convex surface of the resin lens with hard objects. It is best to store them in a box.

　　2, the resin lens should be rinsed with water first, then cleaned with a special cleaning agent for the resin lens or a small amount of detergent, and finally wiped dry with a special lens cloth for the resin lens.

　　3. Use a special lens cloth for resin lens to wipe. Because ordinary lens cloth has loose fibers and is easy to be mixed with sand particles, it will wear the lens, so it is best to rinse the lens with clean water first. Then wipe it dry with a proprietary lens cloth.