anomaloscope

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anomaloscope

 [ah-nom´ah-lo-skōp″]
an apparatus used to detect anomalies of color vision.

a·nom·a·lo·scope

(ă-nom'ă-lō-skōp),
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. anōmalos, irregular, + skopeō, to examine]

anomaloscope

(ă-nom′ă-lŏ-skōp″) [ anomaly + -scope]
A device used to assess color perception (color blindness). The patient is asked to adjust red and green lights to match another color, e.g., a yellow light.

anomaloscope 

An instrument for testing colour vision in which the observer is required to match one-half of a circular field which is illuminated with yellow with a mixture of green and red in the other half. The yellow half can be varied in brightness, while the other may be varied continuously from red to green. A certain combination of the red and green mixture is considered normal, and variations from that mixture indicate anomalous colour vision. With this instrument one can distinguish between a protanope and a protanomal and between a deuteranope and a deuteranomal. Syn. Nagel anomaloscope. Some anomaloscopes also test for blue-yellow colour vision deficiencies, e.g. Pickford-Nicholson anomaloscope. See defective colour vision; Rayleigh equation.
References in periodicals archive ?
The Nagel anomaloscope was recommended to confirm the identification of protan deficiency if required.
The spectral anomaloscope, such as the Nagel anomaloscope, is the accepted reference test for congenital red-green colour deficiency.
12) The currently available Neitz OT and Oculus Heidelberg anomaloscopes are designed to perform in the same way as the original Nagel anomaloscope, which is no longer available.