Heinz - just to clear up your worries about NATS, a CAA class one medical is just that, and as long as the certificate is valid with no restrictions, NATS have no authority whatsoever to query it.
At the moment, atco's are only covered by CAA medical regulations, not JAR, but JAR will encompass the CAA world in the future - when I don't know.
I think that JAR standards do now apply to pilots though, and that the corrected eyesight requirement is higher than currectly required by the CAA.
As an atco I have a class one medical certificate which covers me for atco duties, howecer I also have a FISO licence, for which I must have a Class 3 medical certificate
- I don't have a separate medical examination, when I go for the class one shake down, the AME gives me 2 certificates and charges the appropriate fee!
As for laser surgery, I'm not an expert in the field, but be very careful.
As I understand it, there is no guarantee with regard to long term stability and subsequent eyesight standards, which is why the CAA medical branch need to make regular checks.