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and strength of the color vision defect.

The wavelengths of the three lights used for an anomaloscope are defined by the match of equation that the anomaloscope is defined to. There are four different matches:
* Rayleigh Match - a test light at 589 nm (yellow) and mixture lights at 545 nm (yellow-green) and 670 nm (red). This is used to characterize red-green deficiencies.
* Engelking-Trendelenburg Match - a test light at 490 nm (cyan) and mixture lights

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