You need to pass one of the tests accceptable for the CAA during further investigation into colour perception.They
Holmes-Wright
Beynes
or Spectrolux
Any others simply won't do 'cos the JAA says so.
City Uni are devloping a test called the CVT and there is a link to it on this board somewhere...but that is not accepted as a pukka test yet althought it produces far more quantifiable results in an understandable format.
Good luck!