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.
If an anomaloscope is not available, the efficiency of a new test can be compared with that of a validated test.
The Nagel anomaloscope is a direct view spectroscope that presents a Rayleigh match (red + green = yellow).
d) The applicant must have normal colour vision as assessed by the anomaloscope
35) Abnormal tritan matches on the anomaloscope have also been linked to an increased risk of progression from ocular hypertension to glaucoma.
The anomaloscope is the definitive test for red-green colour vision deficiencies against which the results of other tests are compared.