Selection of spectacle lenses
1, according to the refractive index: the higher the refractive index of the lens, the thinner the lens, but the higher the price.
2, material selection:
Glass sheet: At present, the utilization rate is low, and the factory mainly makes high refractive index, such as refractive index 1.8 and 1.9.
Resin sheet: at present, it is still the most mainstream material, and the hardness is higher after surface strengthening. Definitely not as good as glass lenses.
PC film: The domestic maturity needs to be confirmed, but its lens is light, tough and unbreakable.
Guidance: Myopia below 300 degrees does not affect vision. Glasses are not recommended. Especially/kloc-children under 0/8 years old.
For more information about eye myopia, it is recommended to consult Beijing Meiermu Runshi Eye Hospital. Beijing Meiermu Hospital is a teaching base in peking university health science center, a member of the World Ophthalmology Foundation, a key discipline in Haidian District, a designated specialized hospital for medical insurance in Beijing, a designated hospital for new rural cooperative medical system in Haidian District, a cooperative unit of Beijing Red Cross, a designated hospital for "Bright Action of Beijing Red Cross", a public welfare partner of Lions Club of China and a designated hospital for cataract surgery of Lions Club of China.