英语词汇“twenty-twenty vision”的翻译、意思、用法、释义-英汉汉英双解词典-爱贷网

词汇	twenty-twenty vision
释义	twenty-twenty vision ˌtwentiˌtwentiˈvɪʒn 短语¹¹⁴⁴⁶⁷⁺⁴ 基本词源 n.〈医〉正常视力来自视力测试公式 20/x vision,其中分子 20 即 20 英尺，约为 6 米，人与视力 E 图站立的距离，分母为字体大小鉴别力，如分母为 20，则除数为 1，即正常视力，如分母为 10，则除数为 2，视力好于正常视力的人一倍，如分母为 40，则除数为 0.5，较差视力。鉴于现代社会近视眼越来越多，所以由正常视力引申词义极好的视力。
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