Anomaloscope
Anomaloscope
Anomaloscope (/əˈnɒmələˌskoʊp/) is a type of ophthalmic instrument used in the diagnosis and study of color blindness. The term is derived from the Greek words 'anomalos' meaning irregular and 'skopein' meaning to look or examine.
History
The anomaloscope was first developed in the early 20th century by the German ophthalmologist Richard Liebreich. It was later refined by other researchers, including the British ophthalmologist William de Wiveleslie Abney and the American psychologist Leo Hurvich.
Function
The anomaloscope is used to measure an individual's ability to match colors. It works by presenting the user with a split field of view. One half of the field is illuminated with a mixture of red and green light, while the other half is illuminated with yellow light. The user is then asked to adjust the intensity of the red and green light until it matches the yellow light. This test can help to determine the presence and severity of different types of color blindness, including protanopia, deuteranopia, and tritanopia.
Related Terms
- Color Vision: The ability of the eye to differentiate colors.
- Protanopia: A type of color blindness that results in a reduced sensitivity to red light.
- Deuteranopia: A type of color blindness that results in a reduced sensitivity to green light.
- Tritanopia: A type of color blindness that results in a reduced sensitivity to blue light.
- Ishihara Test: A color perception test for red-green color deficiencies, named after its designer, Dr. Shinobu Ishihara.
External links
- Medical encyclopedia article on Anomaloscope
- Wikipedia's article - Anomaloscope
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