Brown is the only pigment present in the eye. Melanin in the iris of the eye and the various amounts present determines the eye color of the eye.
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‘Pigment melanin determines the color of the eye. Less melanin, lighter the eye color; more melanin, darker the eye color.’
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"Everyone has melanin in the iris of their eye and the amount that they have determines their eye colour," said Dr. Gary Heiting, a licensed optometrist and senior editor of the eye care website All About Vision. 
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"There’s really only brown type of pigment," says Dr. Heiting.
Dr. Heiting reported CNN that technically all eyes are brown. The melanocytes present varies from individual to individual.
The various shades of the eye is due to the presence of melanocytes in smaller amounts and hence, eyes are lighter in color.
“Those with less melanocytes can not absorb as much light, so more light is reflected back out of the eye,” quoted Dr. Heiting.
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