Farnsworth Lantern Test

The Farnsworth Lantern Test (FALANT) is one of the popular color vision tests developed for sailors to identify red-green deficiencies for completing their tasks requiring color vision, such as recognizing signal lights at night. The test was invented by Dr. Dean Farnsworth (Commander, United States Navy) in the Naval Submarine Research Laboratory in New London, Connecticut, during World War II. After its adoption by the United States Navy in 1954 as the standard color vision test for sailors aboard ships, it was also used to screen flying personnel.