A type of Lantern (often abbreviated as FALANT); though this original model is no longer produced, it is still oft-used - even sought after - and used models can still cost as much as $5,000, when available. Modern versions like…

The FM-100 is an Arrangement Test comprising 88 colored tiles. It was invented in 1949. The Farnsworth D-15 is generally preferred by practitioners. Although the original test uses physical color tiles arranged in long wooden boxes, there are on-screen versions…

An inactive Color Code that describes color through symbology. A former competitor of the ColorADD System. Website https://www.youtube.com/watch?v=b_HJavHqCHY

A type of test that alternately flickers two alternating colors at a frequency below the Flicker-Fusion Frequency. It is used to measure different kinds of Contrast Sensitivity. It is an alternative to Gratings, which offset two colors spatially, instead of…

A theory describing the evolutionary pressure that caused the emergence of color vision. Maximov (2000) argued that ripples on water surface cause uneven diffraction and therefore animals living near under the water surface would experience a constant flickering of light.…

A fluorescent pigment/dye is one that absorbs light at one wavelength and emits it at another. This is the phenomenon used in blacklight illumination, which is simply a UV Illuminant that is invisible to the human eye when simply reflected…

The very center of the Macula, which itself is at the center of the Retina. The Fovea has a very high density of Cones compared to the rest of the Retina, which is dominated by Rods. Density of Rods and…

or Critical Flicker Frequency; The frequency of a Flicker Test above which the flickering is not noticeable. Most humans have a fusion frequency of about 60 Hz. At higher frequencies, the flickering colors merge into one constant color. Birds have…