Can you go blind by piercing your earlobe?

My mom's boss told her that if you hit a vein in your earlobe when you get it pierced you can go blind. Is it true? I REALLY wanna get mine done, but my mom keeps saying i can't because you'd go blind, it's not a 100 % chance you'd go blind. I mean..probably millions of people do that, and they're not blind. Thats a stupid fact actually, I mean..she would've been lying, but all i want to know is if it it's true or not.