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A number of existing vision-assistive devices or techniques operate by breaking binocular redundancy, though usually in the spatial rather than spectral domain. Examples include hemianopia (partial blindness in the left or right visual field) treatment using spectacles with a monocular sector prism that selectively relocates the visual field in one eye, leaving the other eye unaffected, and thus conferring an additional 20 of visual-field sensitivity for binocular vision13,14, and the treatment of presbyopia by correcting one eye for near vision and the other for distance vision15. Figure 2: Wearable passive multispectral device comprising two distinct transmission filters (a) Simplified schematic of an optical filter comprising several thin-film layers. (b) Measured transmission spectra of fabricated Filters 1 (black) and 2 (blue). (c) Magnified portion of the transmission spectrum from (b), including angle dependence with angle of incidence (AOI) from 0 to 15°. (d) Colors of an example metameric pair (1, 2) and D65 broadband white light (3), as perceived by a typical trichromat. The traces in each box are the underlying unfiltered spectra (arbitrary units), taken from our experiments, as described in Fig. 3. (e, f) Rendered monocular colors of the spectra in (d) after passing through Filter 1 and Filter 2, respectively. Note that e(1) and e(2), f(1) and f(2) are substantially distinct, while e(3) and f(3) are similar in color due to the white-balance constraint enforced in our design. 4PDF Image | Enhancing color vision by breaking binocular redundancy
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