I can't believe we are debating the use of visors in the NHL again. Why would anyone care if NHL players wear visors, helmets or protective cups? If players want to risk the loss of an eye or another injury as a result of their own neglect so be it.
This isn't the same as the head shot issue. Playing without proper protection is a personal choice. But when someone tries to scramble your brains but slamming your head against the glass, that isn't a personal choice. Some else is making that decision.
Serious eye injuries are rare but they do happen. Manny Malhotra has a serious eye injury last season. Bryan Berard has one about 10 years ago and you only have to watch him on Battle of the Blades to see how gruesome of an outcome that can have. About 70% of the league players are wearing visors. The rest either believe a visor will affect their play or don't believe they will get injured. And that's fine with me.