FWIW, I was issued 'cheaters' in flight school(USN) during my NAMI physical. My eyes were right around 20/40ish. This was in 1998. I personally think the medical standards for vision and use of glasses are 'relaxed' and 'tightened' as the needs of the Service dictate. I subsequently had PRK while on active duty. Seeing 20/15 in both eyes now.