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Most insects, when exposed for any length of time to strong light, fade or lose color, and the only way to prevent such achromatism is to exclude the light.

The state or quality of being achromatic; as, the achromatism of a lens; achromaticity.

Leonhard Euler in 1747 had suggested that achromatism might be obtained by the combination of glass and water lenses.

The perfect achromatism of a reflector is, of course, a great advantage, but the chromatic aberration of refractors is now so well corrected that their inferiority in that respect may be disregarded.

Thus examined, the departure of the eye from achromatism appears very gross indeed.