Hexalens glasses use unique filters that allow only some types of light to enter each eye. The filters in each eye are different, allowing each eye a unique trichromatic perception of the surroundings. This is called wavelength multiplexing. However, to reach hexachromacy, the images are fused in the brain by a process called binocular redundancy. This takes the unique trichromatic experiences from each eye and merges them into a full, hexachomatic experience.


Definitions:
Wavelength multiplexing - Wavelength multiplexing allows specific lenses to make unique images and represent visual data human eyes cannot discern in a way that makes it easy to see.
Hexachromacy - Hexachromacy is the condition of possessing six different types of cones (and six different opsin classes) that allows the discrimination of 281,474,976,710,656 unique colors and 281,474,959,933,440 colors that are completely different from trichromatic colors. Hexachromats are able to see three new primary colors and many new secondary colors.
Trichromacy - Trichromacy is the condition of possessing three different types of cones (and three different opsin classes). This is the type of vision that most humans have. This type of vision allows discrimination of 1,000,000 unique colors.
Binocular redundancy - A neural process that aids depth perception, but can be repurposed to deliver hexachromatic vision by fusing trichromatic colors in seemingly impossible ways. This phenomenon is known as "impossible color."
Opsin - Any photoreceptive pigment that allows certain wavelengths of light to be detected. Combined, they allow dichromatic, trichromatic, tetrachromatic and pentachromatic vision in the animal kingdom. No known animal is hexachromatic.
Wavelength - The frequency of a light wave.