morehops52
50 Cal.
I was an optician for 10 years. All RX lenses dispensed in the US must pass : The "drop ball" test determines the basic impact safety classification for lenses. In this test, a one-inch diameter steel ball is dropped onto the lens from a height of 50 inches. To pass, the lens must not crack, chip or break. All glass safety lenses must undergo this test. NOTE: this is for basic impact test. There is also a high-impact standard that I am not familiar with.
In addition most of these lenses will have UV protection built in , except CR-39 plastic. The vast majority of RX lenses made are polycarbonate which is the most impact resistant of the RX lens materials. The other common mat'l is high-index plastic which is for folks with stronger prescriptions. Very few RX's are filled with optical glass or CR-39 in my experience.
I wear my prescription eyeglasses for shooting but I do keep safety over-glasses around for when I want to protect my RX lenses. The choice is yours.
In addition most of these lenses will have UV protection built in , except CR-39 plastic. The vast majority of RX lenses made are polycarbonate which is the most impact resistant of the RX lens materials. The other common mat'l is high-index plastic which is for folks with stronger prescriptions. Very few RX's are filled with optical glass or CR-39 in my experience.
I wear my prescription eyeglasses for shooting but I do keep safety over-glasses around for when I want to protect my RX lenses. The choice is yours.