When looking for the best prescription shooting glasses, impact resistance and shatter proof is the most important feature you should consider. Having weak prescription sunglasses that damage easily when the bullet ricochets off the gun can bring serious injuries to your eye. That is why the government has set strict standard measures to protect every shooter.
The American National Standards Institute (ANSI) is an organization that is responsible for setting standards for manufacturing of products. In this case, the ANSI has also set standards for safety eyewear. If the lenses of any safety eye glasses are not impact resistant, then they cannot pass the 'drop-ball' test. Usually, in this test, a ball is dropped onto the lens of the shooting glasses from a significant distance. If the lens can withstand the impact, then it is fit to be used as shooting glasses. If the lens shatters, cracks, or breaks, then it cannot be used for safety glasses.