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   SnellenChart
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| appearance as argument number 1 |
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| (documentation SnellenChart EnglishLanguage "A chart of letters, that appear random, used for measuring visual acuity.") | Medicine.kif 1700-1701 | |
| (subclass SnellenChart MeasuringDevice) | Medicine.kif 1699-1699 | SnellenChart 是 测量工具 的 subclass |
| appearance as argument number 2 |
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| (termFormat EnglishLanguage SnellenChart "Snellen chart") | Medicine.kif 1702-1702 |
| consequent |
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| (=> (visualAcuity ?H1 ?I1 ?I2) (exists (?S ?L) (and (instance ?S SnellenChart) (instance ?L Looking) (destination ?L ?S) (agent ?L ?H1)))) |
Medicine.kif 1726-1733 |
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