Hermie
It all depends on your existing condition, I believe for most short sighted operations the caa is fine with lasik correction as long as the condition hasnt deteriorated over a specific period.
For other conditions, e.g. astigmatism there has not been enough long term data for issue of class 1 medical, but its all down to the individual condition.
have a look at
http://www.srg.caa.co.uk/
my advice would be to drop them a mail and someone will get back to you quickly and discuss your situation, i wouldnt want to go through all the trouble to find out its unacceptable - like I nearly did!
Good luck