| 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 1688-1689 | |
| (subclass SnellenChart MeasuringDevice) | Medicine.kif 1687-1687 | Snellen chart is a subclass of measuring device |
| appearance as argument number 2 |
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| (termFormat EnglishLanguage SnellenChart "Snellen chart") | Medicine.kif 1690-1690 |
| 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 1714-1721 |
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Sigma version 3.0 is open source software produced by Articulate Software and its partners