Hi Saintjoseph,
I don't want to be seen flogging a dead horse on this since I really have no personal stake in this whatsoever, but if it's true that several airforces have given a green light to eye surgery beyond the USN, then the CF's policy could be declared at best "extraordinarily conservative" in its estimation of the potential risk.
But as has already been noted on this thread, I suspect it may have less to do with science than convenience - if you can demand physical perfection in candidates, and still get a good number of applicants, then why not?
But I would go a step further and posit this radical proposition - I don't think it matters one iota if you wear glasses (assuming they're not coke bottles of course) as a pilot flying modern military aircraft including fighters (although I know my pilot friends may strongly disagree). My father eventually wore glasses while flying CF104s and it didn't impact his capabilities in the slightest (in fact he claimed to be able to see bogies well before his wingmen since he was corrected to better than 20/20, how's that for irony?).
Infantry guys, for example, are much more likely to get smacked around in the mud and ooze and they are allowed to have corrected vision. And although having the ability to see the Hun in the Sun is still a vital skill for for combat pilots a lot of visuals are right in front of your nose in the cockpit HUD.
Certainly in the commercial flying world it's no longer an issue (even though at one time Air Canada insisted on candidates having 20/20 IIRC) - and yes I realize that military flying has other physical demands.
I would sugges that the days of open cockpit flying are long over, and even though the air force insists on 20/20 - it could be described as a quaint holdover from the past, and - as a requirement in its pilot candidates - not much more justifiable than insisting on all candidates having a tailwheel endorsement or knowing how to handprop your machine.
I guess you can start flogging me now instead of that dead horse
cheers all, mdh