Either way, the impact on their vision is so similar that it's considered one disorder, red-green colorblindness, which is the most common single-gene disorder in humans, affecting 1 in 8 men and 1 in 230 women of Northern European descent world-wide (and slightly fewer in other racial groups).

WSJ: New Outlook for Colorblindness

Much of the violence and disorder in Kunduz, as elsewhere in Afghanistan, takes place beyond the vision of American soldiers and diplomats.

NEWYORKER: After America