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 This is still used in a few jurisdictions but has been superceded by better testing.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 This is still used in a few jurisdictions but has been superceded by better testing.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
Thank
Get help from a real doctor now
Dr. Tonga Nfor
Board Certified,
12 years in practice
507K people helped
Continue
107,000 doctors available
Read more answers from doctors