An instrument used to diagnose abnormalities of color perception in which one-half of a field of color is matched by mixing two other colors. [G. anomalos, irregular, + skopeo, to examine]
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anom·a·lo·scope ə-'näm-ə-lə-.skōp n an optical device designed to test color vision by matching a yellow light which may be varied in intensity with a combination of red and green lights of constant intensity
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n.
an instrument for testing colour discrimination. By adjusting the controls the subject has to produce a mixture of red and green light to match a yellow light. The matching is done on a brightly illuminated disc viewed down a telescope.
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anom·a·lo·scope (ə-nomґə-lo-skōp″) [anomalo- + -scope] an instrument used in testing for anomalies of color vision by having the subject match mixed spectral lines.Medical dictionary. 2011.