The Farnsworth D-15 Color Vision Test 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. Large differences in color of adjacent caps in the Farnsworth D-15 Color Vision Test evaluate major color confusions. Confusion lines for a given type of color defective connect various pairs of Farnsworth D-15 Color Vision Test sample colors, causing patients with severe color deficiencies to make arrangement errors on their Farnsworth D-15 Color Vision Test.

Unique to the Farnsworth D-15 Color Vision Test is the clever design of the plastic box in which the caps are housed. The Farnsworth D-15 Color Vision Test 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, the side removes also. The caps all slide out of the Farnsworth D-15 Color Vision Test in a random order with just the push of a finger. When the patient replaces the caps, the Farnsworth D-15 Color Vision Test box is closed. Then the Farnsworth D-15 Color Vision Test 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 facilitating quick and accurate scoring of the caps.

The Farnsworth D-15 Color Vision Test is designed to correctly identify all (congenital and acquired) color deficiencies, no matter how slight. A score sheet is enclosed with the Farnsworth D-15 Color Vision Test to represent the order of the patient's arrangement of the caps, with respect to their correct sequence around the color circle.

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 Flashlight Test uses nine interchangeable filters that recreate the chromaticity of the original Farnsworth Lantern Test.

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