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The test makes it possible to diagnose almost all anomalies of colour vision like deuteronopia, protonopia, tritanopia etc.
21,23) The involvement of the S-cones is also suggested by an increased zone of foveal tritanopia (a tritanopic defect present in normal central vision due to the absence of S-cones) found in some diabetic patients.
Dichromacy is further divided into protanopia, deuteranopia and tritanopia.
Reports of tritanomaly exist, but these were probably describing incomplete tritanopia rather than a distinct genetic disorder.