| 单词 | snellen's chart test |
| 释义 | Snellen's chart testSnellen's chart testA standard vision-testing chart of letters of diminishing size, used at the standard distance of 6 m. The eyes are tested one at a time and the result recorded in terms of the lowest line that can be correctly read. (Hermann Snellen, 1834–1908, Dutch ophthalmologist). |
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