Don't want to rain on anyone's parade....
CASA are about to change the rules on color blindness, and have applied to be exempted from equal opportunity laws (on color blindness, and pregnancy), on safety grounds.
My (limited) understanding of the changes proposed for 1st May 2003 is that they include a tightening of color blindness standards, so that lantern is no longer recognised, and that ishihara is the standard- period.
I'm ready to be corrected, but that is the info I have. I understand that quite a few people are sweating on this.