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The cells in the retina of the eye are extremely sensitive to oxygen levels. Most "passing out" (as opposed to chemically-induced unconsciousness) is related to lack of oxygen caused either by restriction of blood flow or momentary loss of blood pressure from standing too quickly, etc. We have three sets of cells that are sensitive to light that we would call red, yellow and blue-green. Together, they allow us to see colors. Whichever set stops working last would control the last color you see.
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∙ 14y ago
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∙ 16y agolack of oxygen and blood flow
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