they can both be used to see things, if they function properly.
Both are equally good foe seeing with.
The ability to see out of the eyes.
Both ar well known it depends on the majority and minority around you.
Brown eyes are more common.
no, that depends on where you live. in Europe, for example, blue eyes are more common/
I get your point, but I answered the question... Of the 5.5 billion on the plant, which is more common blue or brown. Let's just count the 1.3B Chinese and the 900M Indians... 97% do not have blue eyes.