colour perception tests

Definition: Equipment or accessories used to evaluate or test an observer's colour vision. * Type of tests include (a) the identification of coloured samples: e.g. the Ishihara plates: observers with normal colour perception can see patterns which perception-deficient observers cannot (b) placing a series cards of varying hues but similar saturation and lightness into hue order e.g. Farnsworth-Munsell test (c) attempting -- e.g. using the Nagel anomaloscope -- to match yellow light using a mixture of red and green: observers colour-deficient vision obtain different results from those with normal vision.

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