Originally Posted by USMCFLYR

I honestly don't believe that deficient color vision had anything to do with the TLH mishap as a casual factor - but the defect was discovered during the investigation. I also think that if you can pass the Lantrin test that you most likely won't have a problem with the FAA's MFT/OCVT test - which will then cover you for your medicals.
There is a lot of information about that testing process and the procedures required on the forum.