Yea I can second NGs comments. Once you are in you're OK and will even get your bins paid for. But not the Raybans.
Same applies to Hayfever - no chance of passing selection if you suffer (or admit to it!), but once you are in the docs are quite happy to throw all sorts of medication your way should it need it.
I have been told the same also applies to venereal disease but never having done a Harrier det to Belize cannot independently corroborate that one!