Optical glass is the most commonly used optical material, with mature manufacturing technology and complete varieties. Generally, optical glass can transmit various colors of light with a wavelength of 0.35~2.5μm, and light beyond this wavelength range will be strongly absorbed by the optical glass.

As the weather gets hotter and hotter, the sun gets stronger and stronger. People in the streets all wear sunglasses. So, do you know why so many people like to wear sunglasses? What are the characteristics of sunglasses? Xiangqi takes you to find out.

Once diagnosed with myopia, it must be corrected in time. It can be treated by wearing glasses or by surgery. Both can achieve the corrective effect. The specific choice depends on the actual situation of the patient. Can not choose blindly, so as not to affect the recovery of vision. In most cases,......

Yes.

15 days of vacation.

NO.