Sunglasses, also known as sunglasses and sunglasses, are glasses designed to protect the eyes. The lenses are often black or dark to avoid irritating the eyes (especially ultraviolet rays). China had sunglasses in the Song Dynasty.
The oldest glasses in China are round monolithic mirrors made of crystal or transparent minerals.
In the Ming Dynasty, Western glasses were introduced into China through the Western Regions or Nanyang. Wu Kuan wrote a poem after the glasses were given by friends. The description in the poem is "The circle is the same as the English pod, the net and the mica are the same." Near eyelids, monocles are also known as "single photos", "single lighting has been, the old biography is the Western legacy." ("Suzhou Fuzhi")
Many car drivers often wear a pair of black glasses while driving. When driving a car in the sun or on a snowy day, this pair of black glasses protects the eyes from the long-term stimulation of glare. However, when the car suddenly sailed from the bright spot to the dark, wearing black glasses became a burden. It’s too inconvenient to wear it for a while and pick it up for a while. Is there any good way to relieve the driver's troubles? Yes, wear color-changing glasses. In the sun, it is a pair of black sunglasses, and the dark glass lens blocks the dazzling light. In a softly lit room, it becomes the same as ordinary glasses, transparent and colorless.