Spectacle lenses can be divided into two major categories, namely glass lenses and optical resin lenses.
The glass lens includes an optical glass lens and a high refractive index lens (so-called ultra-thin film), which has high hardness and good wear resistance. Generally, the quality and various parameters do not change with time, but the resistance of the glass lens 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 sheets, but they have a lower surface hardness and are more susceptible to scratching. Resin lenses and coated lenses are soft because of their characteristics. Therefore, please be careful not to let the mirror directly touch the hard object. It is best to clean with water (or a small amount of detergent) before scrubbing, then use special test cloth or high quality cotton paper. Drain the water droplets on the lens. In addition, coated lenses should be used with caution in places with poor environmental conditions to avoid contamination with dirt.
When selecting the spectacle frame, in addition to the price and aesthetic standards, it is important to pay attention to the size of the selected frame as far as possible, because it directly affects the intrinsic optical quality and wearing comfort of the glasses.