3 doctors weighed in:

What is the farnsworth lantern test for?

3 doctors weighed in
Dr. Richard Bensinger
Ophthalmology
2 doctors agree

In brief: 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 This is still used in a few jurisdictions but has been superceded by better testing.

In brief: 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 This is still used in a few jurisdictions but has been superceded by better testing.
Dr. Richard Bensinger
Dr. Richard Bensinger
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