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people usually rely on adjusting the pupil size to adjust the luminous flux in the sun. when the light intensity exceeds the adjustment ability of the human eye, it will cause damage to the human eye. anti-ultraviolet rays: sunglasses can prevent ultraviolet rays from harming the eyes and make the eyes healthier sun protection, cooler wearing sunglasses not only protects from sun, it makes us look cooler for those who pursue quality and individuality, sunglasses are undoubtedly a good choice