In addition to waterpau's post, if youve had laser surgery....if your pre-op prescription is outside the initial requirements then the deviation is a long-term one, not short-term. So the UK aircraft restriction remains on your medical indefinately, and you need to separately plead with the other JAA authorities for their permission.
This is due to fineprint in the rules... With laser surgery the renewal limits dont apply, even if you're going for a renewal!
This isnt the case for you, invisible me, because you are within the initial limits. Just thought Id add this for anyone in this position.