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Medical Definition of Nagel's test
1. A test for colour vision in which the observer determines the relative amounts of red and green necessary to match spectral yellow; an instrument called Nagel's anomaloscope is used. (05 Mar 2000)
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1. A test for colour vision in which the observer determines the relative amounts of red and green necessary to match spectral yellow; an instrument called Nagel's anomaloscope is used. (05 Mar 2000)