Dichromatism represents one of the more benign forms of colour vision deficiency, where an individual perceives only two of the primary colours, instead of three. Such a condition, in both a psychological and neurological sense, arises when one of the three cone photoreceptors (red, green, or blue) is either absent or not functioning. While it is not severely debilitating, it does affect one’s colour perception and may impact everyday tasks, like driving, or any design-related work. Understanding dichromatism assists psychologists in the analysis of more advanced forms of disorder relating to sensory processing and visual perception. For example, red-green dichromatism might explain the difficulty someone has when trying to distinguish red and brown objects.
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