First, check the big thread at the top of the page, it's not just similar, but identical.
Secondly, eyesight rules have recently changed so that the requirements for Pilot in the RAF are the same as Pilot in the RN, so it could be worth checking that out against your own prescription.
Ignore your Dad [well, to an extent]... If you want something, look into it and go for it.
Also check out
http://www.thestudentroom.co.uk 's Armed Forces forum for other pearls of wisdom.