Clothing, it seems, can make us colour blind, because whether we perceive someone as' white 'or' black 'depends not just on skin tone - but also how smartly they are dressed, according to researchers.

研究者声称，似乎，衣服能让我们变成色盲，因为我们不会仅仅依靠肤色来辨认一个认识黑人还是白人，而是他们穿了什么样的衣服。

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The boy wanted to BE a signalman on the railway, but could not BE a accepted for the post as he was colour blind and could not tell read from green.

这个男孩想在铁路当名信号员，但是没有录取因为他患有色盲，分不清红色和绿色。

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People who are colour blind are not allowed to become aircraft pilots.

患有色盲的人不能当飞行员。

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Lifeboat crews must be aged between 17 and 45, live or work in Cleethorpes, be physically fit and not colour blind.

BBC: Cleethorpes RNLI lifeboat crew seeks volunteers

Although the voters of Illinois now seem to want to turn her out, Democratic leaders are not yet that colour-blind.

ECONOMIST: Illinois politics

South Africa's brief experiment with colour-blind government died, and was not revived until Nelson Mandela's triumph in 1994.

ECONOMIST: South Africa