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Here, we aim to simulate tetrachromatic (and possibly higher-dimensional) color vision in typical trichromatic humans by increasing the number of effective cone types in the visual system comprising the two eyes and a passive optical device. The term “effective” is used here to differentiate between true tetrachromatic vision, which would be defined by four distinct retinal photopigments that generate distinct neural responses. Our approach breaks the binocular redundancy of the two eyes, where the visual fields of each eye are overlapping, providing different spectral content to each eye via a wearable passive multispectral device comprising two optical transmission filters (Fig. 2). Figure 1: Compression of spectral information (a) A sample spectrum generated by a cathode ray tube (CRT) monitor displaying a purple color. The filled rectangle represents a single spectral bin, if the continuous spectrum is divided into N bins. (b) (i) Normalized spectral sensitivity of the cone types for a typical trichromatic observer (𝑀 = 3). (ii) Normalized spectral sensitivity of the effective cone types for a typical trichromatic observer enhanced using our device (𝑀 = 4). (c) A representation of the perceived color of the spectrum in (a). The case with 𝑀 = 4 cannot be displayed, but extra spectral information would be present compared to the 𝑀 = 3 case. 3PDF Image | Enhancing color vision by breaking binocular redundancy
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