During last week's World Cup's opening game between Saudi Arabia and host country Russia, people who have color blindness complained on Twitter that they had trouble identifying the teams, Mashable.com reports.
The reason? The teams wore red (Russia) and green (Saudi Arabia). Many color-blind people can't distinguish between red and green.
More than a few people were upset, and it's not a small problem, since CVD (color vision deficiency) affects approximately one in 12 men (8 percent) and one in 200 women worldwide.
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