Sunglasses, also known as sun visors, for shade purposes. People in the sun usually rely on the adjustment of the pupil size to adjust the luminous flux, when the light intensity exceeds the human eye regulation ability, it will cause harm to the human eye. Therefore, in outdoor activities, especially in the summer, the need to use sunshade to block the sun, in order to reduce the eye caused by fatigue or light stimulation caused by injury.
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