Can a rattlesnake tail make you go blind?

Depends on what you are doing with the tail.

• If it's still attached to the snake, going blind is the least of your problems. I'm pretty sure the bite would be worse.
• If you poke yourself in the eye with it, Yes you could go blind.
• If you are just handling it (and it's detached from said snake) then no you won't go blind.