Generally speaking, spectacle lenses can be divided into two categories, namely glass lenses and optical resin lenses.

Glass lenses include optical glass lenses and high-refractive-index lenses (commonly known as ultra-thin sheets), which have high hardness and good abrasion resistance. Generally, their quality and various parameters will not change with time, but the resistance of glass lenses Impact and weight are slightly inferior to resin lenses.

Resin lenses are generally much lighter than glass lenses and have better impact resistance than glass lenses, but their surface hardness is lower and they are more likely to be scratched. Resin lenses and coated lenses are soft because of their characteristics, so you should always be careful not to let the mirror surface directly contact hard objects. It is best to wash with water (or a small amount of detergent) before scrubbing, and then use a special test cloth or high-quality cotton paper. Dry up the water droplets on the ophthalmic lens. In addition, coated lenses should be used with caution in places with poor environmental conditions to prevent dirt from being difficult to clean.