Definition of color zone
in some theories of vision
: one of the three concentric areas of the retina as distinguished on the basis of their color sense, the outer zone giving practically only the grays, the intermediate zone adding yellow and blue, and the central zone adding red and green so that only the central zone is sensitive to all colors
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“Color zone.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/color%20zone. Accessed 21 Jan. 2022.
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