The teacher sent me home with a note for my mother that said I needed to visit the eye doctor because I failed the vision test.

老师送我回家，给我妈妈留了张便条，上面写着我需要去看眼科医生，因为我视力测试不及格。

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"You get the vision, then you test it with software, " Borakove said.

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He is now employing a vision test used by the US Air Force which checks the ability to discriminate between white, black and grey - the lack of which is another symptom often seen in chronic ciguatera.

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Next, the researchers had female subjects participate in what they thought was a vision test.

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