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1.uv protection: the main function of sunglasses is to prevent uv damage. most sunglasses have uv protection, which effectively filters out harmful ultraviolet rays and protects the eyes from uv damage. 2.eye protection function: sunglasses can effectively reduce the stimulation of sunlight, reduce eye fatigue and discomfort. it can filter out strong sunlight, making the visual experience more comfortable and making outdoor activities more relaxed. 3.visual clarity: the lenses of sunglasses can improve the clarity of the field of view and reduce glare and reflection by reducing the brightness and intensity of sunlight. they can filter out light of different colors, making the external environment appear more vivid and comfortable. 4.fashion style: sunglasses are often used as a fashion accessory to enhance the overall fashion and personality of the design. they have a variety of styles and designs to choose from, suitable for different styles and occasions. 5.eye protection: sunglasses provide some protection to the eyes, reducing the irritation and damage caused by dust, sandstorms, and foreign objects. they act as a barrier to protect the eyes from the external environment..syi