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Sigma KEE - SnellenChart
SnellenChart(Snellen chart)

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 Snellen chart is a subclass of measuring device

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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