Online Farnsworth Lantern Test (FALANT)
The Farnsworth Lantern Test, also known as FALANT, is a quick and reliable method to check for red-green color blindness.
HOW TO PERFORM THE TEST?
Our Farnsworth Lantern Test, which uses red, green, and yellow colors, is not a performance evaluation tool but a basic vision screening.
Please follow these guidelines before starting the test:
- Remove any glasses with colored lenses if you're wearing them.
- The test is meant to be taken with the naked eye only.
- Using color-correcting lenses or glasses may give misleading results and does not reflect true color vision ability.
- Taking the test to "prove" that such glasses work is a common misconception and will lead to inaccurate results.
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WHAT IS FARNSWORTH LANTERN TEST?
The Farnsworth Lantern Test, also known as FALANT, is a quick and reliable method to check for red-green color blindness. It was originally developed for the U.S. Navy and is still widely used in professions that require accurate color identification—like aviation, maritime, and railway services.
- The test uses a lantern device that shows pairs of vertically aligned lights.
- Each light can be red, green, or white.
- The person taking the test is shown multiple light pairs (e.g., red-white, green-red, etc.) for a few seconds each.
- They must identify the colors shown in each pair in order.
HOW DOES IT WORK?
Lantern Test shows a pair of vertically oriented lights consisting of red, green, or yellow-white combinations. The user is asked to identify the two colors (some of which are identical).
There are Nine color pairs are administered during the test, and It begins with a red/green color combination to allow the user to see these two colors pair before seeing a white light, which decreases testing errors.
The test shows colors for only two seconds, as color-deficient people can sometimes correctly identify the colors with prolonged exposure.
Yellow-white color, or one of the identical paired of yellow and white color made a 50% neutral grey filter to reduce luminance cues to the color-deficient patient.
Example1: Up - Red, Down - Green
Example2: Up - Yellow, Down - Red
DISCLAIMER
The information provided by this Farnsworth Lantern Test is intended for general informational use only. It is not a replacement for professional medical advice, diagnosis, or vision certification required for occupational purposes. If you need an official assessment, please consult a licensed eye care provider.
This test is a simplified version of the official Farnsworth Lantern Test used in occupational screening (e.g., aviation, maritime). Results may not be accurate due to screen limitations and viewing conditions. Use it only as a preliminary self-check.
