Protan


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The “first” type of (before Deu​tan and Tritan‌‌‌​) that acts as an umbrella term for and . Protan is associated with the L-Cone and affects the (generally a weakening of the red stimulation).

Protan defects are almost always and arise from mutations of the for the , either by shifting the lower (creating an ), or by rendering it inoperable.

The for Protans are:

  • Red / Orange / Yellow / Green / Brown
  • / White
  • Blue / Purple
  • Dark Red / Black
  • Pink / Gray

A Protan is also an individual who has a Protan defect.