They’ll issue you a few pairs that will fit underneath your helmet.So I’ve got 20/20 but a slight astigmatism. -0.50 in my left eye and -0.25 in my right eye. I only wear my glasses when driving/ flying at night. It’s not even on my license that I need them nor my aviation medical. I know I’m good when it comes to SNA limits but my question is. Does the navy issue you a new prescription/ glasses or can you rock your civilian ones lol