Sunglasses, also known as sun mirror, for shading purposes. Who rely on regulation in the sun often pupil size to adjust the luminous flux, when the light intensity of more than ability to regulate the human eye, it will harm to the human eye. Therefore, in outdoor venues, particularly in the summer, many people are using to block the sun visor mirror, the eyes adjust to reduce glare caused by fatigue or injury caused by stimulation.
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