actionman:
The Farnsworth Lantern (FALANT) Test is simply a series of exercises in which you're shown three lights - one each red, green and white - arranged is varying sequences over 9 trials. The examinee's task is to tell which light is which on each trial. It's been the test of choice in the US Navy for decades for one simple reason: it's widely regarded as the only color-perception test that is absolutely "cheat-proof"!
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Anybody out after 2 AM is either a turd, a cop or a pilot. Or any combination of the three!