anomaloscope ‎(plural anomaloscopes)

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  1. (ophthalmology) An instrument used to test for color blindness by measuring quantitative and qualitative anomalies in color perception.
    • 1981, Procedures for Testing Color Vision: Report of Working Group 41[1]:
      The anomaloscope contains a red-green scale from which may be read a number that is proportional to the amount of red in the mixture field, and a Y scale from which is read a number proportional to the luminance of the test color. In testing an observer, the examiner notes the scale values, which then are available for further transformation as noted for the Nagel anomaloscope.
    • 1982, G. Verriest, Colour Vision Deficiencies VI[2], page 169:
      For the differentiation between color vision defects of retinal origin and color defects as a result of optic nerve disease the determination of the neutral zone and anomaloscope examination are important.
    • 2014, HV Nema, Diagnostic Procedures in Ophthalmology[3], page 22:
      Anomoloscopes are much more difficult to administer than pseudoisochromatic plates and arrangement tests. The first anomaloscope was designed by Nagel and is based on the color match known as the Rayleigh equation, that is, R + G = Y.

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