Disability????
The widespread use of red/green colours to highlight important information is an arbitrary and needless impediment to civilian flying. There are plenty of other colours and visual effects available to show information on screen, and perhaps some manufacturers may respond to lobbying. A recent example: SkyDemon have augmented their awesome software with a weather guide, effectively using red and green as Safe/Unsafe.
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Worse case scenario, people that can't see any colour, will be able to distinguish different shades of grey. However we are not discussing at that level, we are talking about people that have mild to moderate issues distinguishing edge case lab scenarios.
Aviation is highly regulated so has multiple backup aid and information systems , thus provides colour as an aid and not as the primary source of information.
If they want to test one's ability then put them on a real case situation, not a lab.
CAD and other exams test for CVD, not ability to perform the job.