uk, nill errors
faa 7 errors or more fail,
the ishihara pass, in the normal world for 24 plates allows 13/15 for considered normal, as per instructions, there is a shorter version 14 plates, but from the same book, the person testing should present them in a random order to prevent memorizing
monty, did you have the plates presented in the box with a light source, or was it through a view finder, that is sometimes what the faa use, it only has 7-8 plates and no erros..