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1 avoid damaging the retinathe sun contains a large amount of ultraviolet rays and excessive ultraviolet rays will directly damage the retina and cornea thus causing a series of eye diseases sunglasses can completely eliminate ultraviolet radiation thus protecting our eyes 2 avoid direct exposure to strong lightwhen the eyes receive too much light the iris will contract if the eyes contract too much it will cause serious damage and impact to the eyes at this time wearing sunglasses can effectively 3 avoid glarei believe everyone is familiar with the reflection of water light at this time choosing to wear sunglasses can better avoid some damage caused by glare 4 eliminate lightthe frequency of light that can be recognized by the human eye is limited some frequencies of light can not be clearly recognized by the human eye and even lead to vision loss wearing sunglasses can effectively avoid such problems 5 sunscreenit can well protect the fragile skin around the eyes so that it will not be sunburned or cause some melanin precipitation.syi