I'd be careful with this description. The occurence of blue eyes and occasionaly fair hair in Iran, Afghanistan and Pakistan have largely their origins from the Greek/Macedonians under Alexander the Great, who conquered the Persian empire, and intermarried with Persians and Baktrians.
While Persians are lighter skinned than i.e. Arabs, and often have green eyes, they are dark haired since ancient times.
I was, which is why I did not mention fair hair.
At the time of his conquests of these areas, Alexander's armies did not have a very large Greek contingent any more - his invasion of India was undertaken with a force consisting almost entirely of Asian-born troops.
Hence the carping about how he had "gone native" with his Persian dress, Asian troops, Bactrian wife, etc.
I don't buy into the theory that Alexander's Greek troops had a significant impact on the gene pool - there were many more of Alexander's troops stationed in Egypt than there were in India and Egyptians don't look like Punjabis.
Beg to differ on the connotation of “dark hair” etc. - while not generally blond, they acquired their dark side (so to speak) not their blue and green eyes from the Greeks whose Mediterranean darker skin and eyes “congtminated a very light skinned people with lots of blue eyes. For example the nomadic Bakhtiari tribes who avoided “pollution” have a huge number of blue eyed members.