Rare Blue

Why are blue eyes considered “rare” or a “birth-defect”?
I remember reading something saying that blue ares are actually a birth-defect and rare within America and North America.
Why is that?
Thanks
I do not believe blue eyes are a birth defect. They are a recessive gene. Meaning that brown is dominant gene over green, and green is dominant over blue. They are more rare because of the recessive gene.
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