Olympic athletes know that to perform their best, they’ve got to be at their best—mentally and physically. And when we say “physically,” we don’t just mean an athlete’s strength or endurance: it can also mean factors like their eyesight.

Considering everything we know today about concussions and facial injuries, the fact that hockey players used to skate around without any kind of head protection seems like a piece of fiction. Concussions were just “getting your bell rung” and severe cuts to the face and head were badges of honor for goalies like Terry Sawchuk.

Whether it helps people see plays develop on the field or spot teammates to zip a pass to across the playing surface, vision has played a large part in the careers of several legends – no wonder more athletes today are getting LASIK than ever before. Check out these four famous athletes whose vision sets them apart from their peers.

Blurry vision can be a hindrance to several aspects of your life. It can keep you from adequately and safely seeing road signs when driving. It makes it harder to see an important notation made on a classroom blackboard or PowerPoint presentation at work. When it comes to athletic competition, blurred vision can be an absolute impediment to success on the field, court, or rink.