Shadoko
What are the minimum visual performances for AF pilots without corrective lenses?
To say it in simple terms, in France, an optical correction above 5 dioptres on one single eye is a no-go for obtaining a
*french* professional pilot license (more precisely, these 5 dioptres are not really a correction measured on your lenses, they result from a combined spherical/cylindrical measurement performed on your eyes with a special instrument using refractometry). However, once you are a happy PP, even if your visual capability degrades, you won't lose your license until the optical correction you need exceeds 8.0 dioptres. Other countries have more relaxed requirements (
AFAIK, in the US, you just need to have a 10/10 visual acuity
with your corrective lenses). Regarding usage of contact lenses vs. standard glasses, it seems this is left to the individual's appreciation.