Lasik will sometimes be detectable with the slit lamp examination. In my case, it isn't. Corneal topography, which tends not to form part of normal JAA med. exam. will detect Lasik and is used by US military to screen for lasik. Any optitian worth his or her salt will in many cases be alerted to Lasik or PRK having been carried out due to a correlation that exists between eyeball length and short/long sight.
If your vision is within the limits set down by the authorities you have nothing to lose by being up front about your eye surgery. If it's outside those limits or if for any reason you conceal information, you have everything to lose. It's quite possible the barriers may be lowered in the future and equally possible more advanced examination procedures may be introduced.