BTW, I read that Israeli General Moshe Dayan earned his eyepatch while looking over a berm through binocs. The mulitple lenses slowed the Egyptian bullet down a lot, but not enough.
Probably a little more high speed then that.
During World War II Moshe Dayan served in the British army and was part of a Jewish advance unit sent to prevent the Vichy French from blowing up the bridges between Lebanon and Palestine, thus providing time for the British main force to take the offensive. It was during that campaign that he lost one eye; he was looking through binoculars when a bullet ricocheted off them.