#acromata

• Achromatic — An optical system or lens specially corrected to minimize chromatic aberration, allowing light rays of different colors to focus at the same point; in a medical sense, an individual affected by achromatopsia, characterized by the complete lack of color perception, seeing the world only in shades of gray, white, and black.
• Achromatic lens — The feminine form of the term achromat; describes a lens or optical structure capable of transmitting light without breaking it down into component colors at the edges. In medicine, it refers to a female individual affected by total achromatopsia or, in biology, to cells or tissues that do not bind standard histological dyes.