The human species first appeared in what is now called Africa. They were dark-skinned, dark-haired and dark coloured eyes. But in the present times, we now have a range of different colours of skin, hair and eyes. Therefore, Blue eyes are basically a new allele = mutation. Blue eyes first appear in humans about 6,000 to 10,000 years ago.
It is a beneficial mutation because blue-eyed humans get the advantage of coping better with seasonal affective disorder. A disorder that occurs when there is less sunlight at certain times of the year.
It also has the advantage of seeing unmoving objects better than moving things. Blue-eyed humans can also see better in the dark because lighter pigment makes the iris more translucent meaning it lets get more light into the eye.
Bonus:
Blue eyes may have more advantages because based on societies' beauty standards blue eyes may appear more appealing and look attractive and fascinating than the common eye colours in the world today which is dark-brown.
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