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 ?
In addition, Pickford Nicolson anomaloscope was used in the Tibetan study used to distinguish the type and the extent of defect of color vision.
The Pickford Nicolson Anomaloscope is a simple colorimeter based on the use of integrating boxes which has color chance's optical glass filters.
Pickford RW and LakowskiR: Anomaloscope Brit J Physiol Optics 1961; 17: 131.
Table 1: Summary of studies examining the prevalence of colour blindness Reference Colour vision test Sample size (Navjot et al 2009) Ishihara charts n = 2010 Pickford Nicolson Males = 1210 Anomaloscope Females = 800 (Citirik et al, 2005) Ishihara charts Males= 941 Turkish men Females = 0 (Chia et al.
The Nagel anomaloscope is a direct view spectroscope that presents a Rayleigh match (red + green = yellow).
2,3) Specificity is 100%, compared with the Nagel anomaloscope, if 'misreadings' are distinguished from errors on vanishing designs.
d) The applicant must have normal colour vision as assessed by the anomaloscope
d) They should have their colour vision retested with 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.
The anomaloscope allows evaluation of an individual's Rayleigh matches, ie the proportions of red and green light that need to be mixed to match a yellow.
A Rayleigh equation anomaloscope will therefore separate normals from colour deficient observers, protans from deutans and anomalous trichromats from dichromats.