Why shall we wear sunglasses?
Sunglasses also known as sunshades,are used to shade the sun. People usually adjust the light flux by adjusting the pupil size under the sun. When the light intensity exceeds the adjustment ability of the human eye, it will cause harm to the human eye. So in outdoor places, especially in the summer need to use a sunshade to block the sun. in order to reduce the eye adjustment caused by fatigue or damage caused by strong light stimulation.
