What is latern test?

The Lantern Test is a test used to determine the color vision of an individual, especially sailors and pilots who need to identify signal lights or other color-coded signals. The test involves showing the person a series of lights or color-coded symbols and asking them to identify each one. The test uses a lantern that emits a series of lights of different colors and intensities. The lantern test is also called the Farnsworth Lantern Test, which is a standard test for color vision deficiency and is recognized by the US Federal Aviation Administration.