One thing to keep in mind is sunglasses for eye protection. Any sunglasses will dilate pupils of eyes since they are dark. But the cheap sunglasses may not blo

One thing to keep in mind is sunglasses for eye protection. Any sunglasses will dilate pupils of eyes since they are dark. But the cheap sunglasses may not block all or any UV or allow it in from the sides. So you end up with dilated pupils allowing UV in when you were trying to prevent that.