anomaloscope

(redirected from Nagel anomaloscope)
Also found in: Medical.

anomaloscope

[ə′näm·ə·lə‚skōp]
(optics)
An optical instrument for testing color vision, in which a yellow light whose intensity may be varied is matched against red and green lights whose intensity is fixed.
References in periodicals archive ?
The Nagel anomaloscope was recommended to confirm the identification of protan deficiency if required.
TABLE 1: Color Vision Deficient Groups Extent Selection Criteria Deutan Protan Mild anomalous Pass Farnsworth lantern, pass 5 5 trichromats Farnsworth-Munsell Panel D-15 Moderate anomalous Fail Farnsworth lantern, pass 5 5 trichromats Farnsworth-Munsell Panel D-15 Strong anomalous Fail Farnsworth-Munsell Panel 5 5 trichromats D-15 (but not dichromats or extreme anomalous trichromats (a)) Dichromats Match whole red-green range on 10 9 Nagel anomaloscope even after adaptation on Trendelenberg plate Note.
The spectral anomaloscope, such as the Nagel anomaloscope, is the accepted reference test for congenital red-green colour deficiency.