As far as I know, Cathay are vague about the requirements because they have no strict rules. Naturally, they prefer someone who has perfect vision. You are right in saying that they do not believe in laser surgery. It is not fully proven, and Cathay are being cautious. (Did you know that we have a one-eyed pilot!).
I believe the way it works, is that if you do not have perfect vision, you had better have other personal qualities that make up for it. Cathay are not overwhelmed by candidates that are perfect for the job. In fact, at times they find it difficult to find enough people. If you are suited to the job but don't quite have perfect sight, then that's ok. They will still give you a chance.