The simple solution is to purchase some Prescription Shooting Glasses. You shouldn't EVER shoot without eye protection and if you want to shoot with iron sights or a reflex sights seeing the sights clearly is a real advantage if you are shooting for precision. BTW, even a scope won't correct for Astigmatism, all it will so is provide for more magnification and when your eyes get tired you won't be able to see the reticle. Take it from an old fart who has learned these lessons with EXPERIENCE.