What's the name of the small round black sunglasses?

Prince of mirrors. Small black round sunglasses are often ridiculed as sunglasses worn by "fortune tellers", which is the form of sunglasses when they first appeared, also called prince mirror. Sunglasses, also known as sunglasses, are used for shading. People usually adjust the luminous flux by adjusting the pupil size in the sun. When the light intensity exceeds the adjustment ability of human eyes, it will do harm to human eyes.