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For example, to see "stygian blue": staring at bright yellow causes a dark blue afterimage, then on looking at black, the blue is seen as blue against the black, also as dark as the black. The color is not possible to achieve through normal vision, because the lack of incident light (in the black) prevents saturation of the blue/yellow ...
Achromatopsia, also known as rod monochromacy, is a medical syndrome that exhibits symptoms relating to five conditions, most notably monochromacy.Historically, the name referred to monochromacy in general, but now typically refers only to an autosomal recessive congenital color vision condition.
Standing up suddenly (see orthostatic hypotension), especially if sick, hungover, or experiencing low blood pressure. Fatigue; Hyperventilation, paradoxically: self-induced hypocapnia, such as in the fainting game or in shallow water blackout. Overexertion; Panic attack; Recovery is usually rapid.
Tritans see short-wavelength colors (blue, indigo and spectral violet) as greenish and drastically dimmed, some of these colors even as black. Yellow and orange are indistinguishable from white and pink respectively, and purple colors are perceived as various shades of red .
Cats see "muted tones of blues, yellows, greens and grays." When perceiving reds and pinks, cats might mistake them for green, while purple could be seen as blue.
The regions marked A and B are the same shade of gray. A region of the same shade has been drawn connecting A and B. The checker shadow illusion is an optical illusion published by Edward H. Adelson , professor of vision science at MIT , in 1995.
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