millonario
Yes I only did the Ishihara Test for colour-blindness.
However, because my eyes have a substantial amount of myopia, the medical staff at Cathay want me to obtain a detailed report from an opthamologist (after passing flight grading), and my being offered a cadetship will depend on what the doctor says. Applying the same logic, if CX manages to detect a slight problem with your colour perception during your medical, they might let you continue to flight grading, but after grading you will probably need to visit an eye doctor for a report. Then depending on the situation, they would then decide whether or not to offer you the cadetship.
As far as I know, prospective cadets only do one medical examination throughout the selection process. I have the feeling that the Cathay medical exam is more stringent than the normal CAD Class 1 medical check-up. As such, passing the CX medical would mean that not only do you meet company standards, you also meet CAD standards as well.