I believe it's because if/when players get hurt the trainers need to look in their eyes to see if their pupils are dilated. With tinted masks it's impossible to do unless you remove the helmet. Removing the helmet of a player with a neck injury is not a good idea.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.