Eye color
Melanin Presence on Front Layer of Iris
Melanin Presence on Back Layer of Iris
Dominant Pigment Type
Brown
Heavy
Normal
Eumelanin
Blue
Light
Normal
Eumelanin
Gray
Even less than blue
Normal
Eumelanin
Green
More than blue eyes, less than brown
Normal
Pheomelanin
Hazel
More than green, less than brown
Normal
Pheomelanin and Eumelanin
Amber
Heavy
Normal
Pheomelanin
Red or Violet
None or extremely little
None or extremely little
n/a
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From @rozeliya