Where should we start?
Let’s go with the lesser of the two issues here and start with eye safety. Whether you are shooting a bow, a handgun, a shotgun, or a flaming tennis ball gun (what is this thing anyway?) you should always wear shatterproof lenses.
Don’t risk your sight. Wear some shooting glasses.
The second them I’m going to point out is if you don’t lose your vision you just might lose your life. Don’t shoot an unsafe amount of tannerite or anything else that could go boom. You might just find yourself seriously wounded, maimed, or dead.