Many color deficient persons have reasonably good signal light discrimination that cannot be detected with the Farnsworth D-15 Color Vision Test., therefore Gulden also provides the Farnsworth Lantern Test Flashlight. The Farnsworth Lantern Test Flashlight often enables the qualification of these individuals. The original Farnsworth Lantern Test device has long since stopped being manufactured and more modern equivalents are quite expensive for the limited usage they see in a typical optometrists office. The Farnsworth Lantern Test Flashlight is an accurate, inexpensive substitute for the original Farnsworth Lantern Test. This Farnsworth Lantern Test Flashlight uses nine interchangeable filters that recreate the chromaticity of the original Farnsworth Lantern Test.

The Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT) is the newest version of two popular color deficiency tests. To evaluate color confusions a small set of colors are used in the Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT). Large differences in color of adjacent caps in the Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT) evaluate major color confusions. Confusion lines for a given type of color defective connect various pairs of Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT) sample colors, causing patients with severe color deficiencies to make arrangement errors on their Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT).

Unique to the Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT) is the clever design of the plastic box in which the caps are housed. The Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT) design provides a quick and easy method to remove and replace the caps. When the lid is removed on the Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT), the side removes also. The caps all slide out of the Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT) in a random order with just the push of a finger. When the patient replaces the caps, the Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT) box is closed. Then the Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT) is turned over to reveal a transparent plastic bottom. This allows the numbers on the bottom of the caps to be in clear view on the bottom of the Farnsworth D-15 Color Vision Test form of the Farnsworth Lantern Test (FALANT) facilitating quick and accurate scoring of the caps.

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