Sunglasses

Sunglasses, also known as sun visors, are used for shading. People usually rely on adjusting the size of their pupils to adjust their luminous flux when exposed to sunlight. When the intensity of light exceeds the eye's ability to regulate, it can cause harm to the human eye. So in outdoor activities, especially in summer, many people use sunshades to block out sunlight, in order to reduce eye fatigue or damage caused by strong light stimulation.