Well, I do not think the sunburns are resulted in sunglasses directly. In contrast, wearing sunglasses can protect your eyes when you go out.
Eye is the most important sensory organ of human body. And it can get sunburned if exposed to excessive UVA and UVB rays, and cause ophthalmic diseases or damage.
There are some protective effects as wearing sunglasses in summer. But it is very important to choose a good pair of sunglasses, which can filter at least 96% UV. The fake one will not only without the function of UV-proof, but also increase the risk of your eyes.To get full of UV protection, it is absolutely necessary to wearing sunglasses in cloudy sky.
Do not forget to protect your skin at the same time. Those who sunburned their skin must ignore this.