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A member asked:
What is the farnsworth lantern test for?
A doctor has provided 1 answer
Color deficiency: This is a somewhat dated test designed to indicate whether the tested person can distinguish the reds and greens of standard navigation and rail signals. The viewer is shown the various signals and indicates his choice. This is still used in a few jurisdictions but has been superceded by better testing.
Answered 1/15/2013
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