I had a kid who had to wear them, prescription, and his first pair were reflective and the other team said they were distracting. He had to get a pair of non-reflective flat colored sunglasses. Never had a problem after that other than umpires or coaches who would question it but when we showed them the note, important to keep, from doctor that they were required for his health no umpire threw them out. It is like the pitchers arm bands. I have had umpires who said they could not wear them on their arms, some said yes they could, some said on their belt some said on their belt but had to have plastic coating inside not outside. Some said not on them at all but could put them in their back pocket. There are a lot of rules that are not rules but if they are a rule in the umpire's mind they are a rule. The distracting aspect for pitchers is very interesting.