Nagel anomaloscope
A device that used to determine degree of red or green color vision deficit. A dial on the anomaloscope is adjusted until the viewer (patient) believes that the green-red balance is appropriate compared with a standard yellow light whose intensity can also be varied. When a person with normal color vision views the “match” made by a patient with abnormal color vision, a deficit in either red or green color vision is readily apparent.
Related Links
[The Nagel anomaloscope in the diagnosis of eye diseases]. – PubMed – NCBI
(PDF) The Nagel anomaloscope: Its calibration and recommendations for diagnosis and research
RGB Anomaloscope ? Color Blindness Test — Colblindor
The Nagel anomaloscope and seasonal variation of colour vision — Nature
A low-power, LED-based, high-brightness anomaloscope – ScienceDirect
OSA — Comparison of the Nagel Anomaloscope and a Dichroic Filter Anomaloscope*
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How to use a nagel anomaloscope
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Color Vision Testing D-15 100-Hue Anomaloscope
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How to use a nagel anomaloscope