I remember when I had my one and only flight in a Lightning (T4). After he had done his pre takeoff checks at the holding point the pilot reached into his flying suit pocket, extracted a pair of aircrew specs and put them on. My illusions about "steely-eyed fighter pilots" were shattered! In all seriousness he had obviously started off training with uncorrected vision and the specs came along later. Don't know how it goes for WSOP these days, but from the outset as a nav I had prescription specs, which I have to admit I rarely wore as they were for distance work and I didn't need any help seeing the H2S screen a few feet in front of my nose.