Well, now I've heard of 1 person. My impression was that you are unlikely to pass it after failing the Ishihara test. I came from the discussion when I failed the test, but I wonder if there are any statistics.
The point I was trying to make is that the H-W lantern test seems to be quite difficult so isn't really much of an alternative for most people, but I don't have the actual statistics.
Last edited by Zulu Alpha; 16th Jun 2012 at 16:05.