First of all, air traffic controller is not an easy job. The process is as tough as being pilot but just a different process. I am a pilot. That's why i know a bit about ATC. I sometimes go to their tower and talk with them. Actually, it is comparily more difficult to be an ATC in hong kong than overseas. And even you got the licence, they may not hire you. They will post the job if there are vancancy. You can go to civil air department. They will have post there. You can go and check that out. For the ATC, it divided into 3 sections. VFR, IFR and flight services (FSS) I guess hong kong don't have much VFR controleer since there are not much VFR traffic and IFR controller can also handle that. and they required a catagory 1 medical. FSS gives and provide the weather and flight planning information to the pilot or airport. They required catagory 3 medical which is the same as PPL. If you want more information about being ATC, i can tell you some methods. Contact me at [email protected]
you need to obtain class C medical. (or B? can't remember clearly). again, you will need to undergo an eye-sight test. it's difficult to define "perfect eyesight".