The UV rays from the sun will damage our eyes. Too much exposure to sunlight will lead to macular degeneration and cataract. While children often play in the outside, so I think we can buy them a pair of sunglasses if they can promise that they won't damage them. During the development of the eyes, what does sunlight do to our eyes haven't been found yet. But I think a pair of sunglasses is good for children' eyes. So we'd better buy them as soon as possible.