英语词汇“snellen test type”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	snellen test type
释义	Snellen test type Snel·len test type (snel'ĕn test tīp) One of a series of square black symbols employed in testing the acuity of distant vision; the letters vary in size in such a way that each one subtends a visual angle of 5' at a particular distance.
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Snellen test type