According to the researchers, globally, more than 70 percent of people have brown eyes, particularly across Africa, East Asia, and South Asia. Blue eyes are concentrated primarily in northern and eastern Europe, while green eyes occur in approximately 2 percent of the world population. Because absorption dominates over scattering, brown eyes appear consistently brown. Blue eyes are thought to trace back to a single genetic mutation that occurred between 6,000 and 10,000 years ago in Europe. Green eyes are rare because they require a narrow biological balance that occurs infrequently in human populations.

Source: The North Africa Journal December 29, 2025 12:02 UTC