This particular color deficit is true color-blindness in that the person really has no ability to see any color.

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Monochromacy is the complete absence of color vision, also known as total color blindness. People with this type of color blindness only see shades of gray and have no ability to distinguish any colors. Deuteranopia and protanomaly are both types of red-green color blindness, where the person has difficulty distinguishing between shades of red and green. Dichromacy generally refers to any types of color blindness where the person is only able to see two primary colors, rather than the usual three.

This Particular Color Deficit Is True Color-Blindness in That the Person