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sunglasses not only block ultraviolet rays, but also play a decorative role. it reflects your personality and fashion. it can reduce the adjustment burden of the ciliary muscle of the eye under strong light, and make the human eye habitually look at objects under natural light. block out the sun to reduce the fatigue caused by eye adjustment or the injury caused by strong light stimulation. it can be used as a haven for the eyes to prevent dust particles from entering the eyes in windy weather. with the same decorative effect, it is a smart choice to choose affordable products.syi