Earlier quoted context omitted.
"Don't only Caucasians have blue eyes?" No. More than you ever wanted to know about eyes: http://en.wikipedia.org/wiki/Eye_color Also, this is neat: A 2002 study found the prevalence of blue eye color among Caucasians in the United States to be 33.8 percent for those born from 1936 through 1951 compared with 57.4 percent for those born from 1899 through 1905.[10] Blue eyes have become increasingly rare among American…
From your wikipedia link: Blue eyes contain low amounts of melanin... Blue eyes are most common in Northern Europe and Central Europe and to a lesser degree in Southern Europe,North America and southern Central Asia; Afghanistan is a notable example.[30] They're also found in parts of North Africa,[31] West Asia, and South Asia[32], in particular the northern areas of India and Pakistan. It can rarely occur as far so…
Depends who you ask, as race is purely a social construct.. http://en.wikipedia.org/wiki/Craniofacial_anthropometry
Some mongoloids do have blue eyes, but yes this is a result of interbreeding with descendants of the common ancestor.