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    On a doctor's eye chart, why were those specific letters chosen?

    Question #47158. Asked by Buck540. (May 05 04 8:03 AM)


    fosse4

    		The letters are deliberately chosen but are randomly used.
    The shape of the letter determines whether you can see it clearly or not.

    eg, C can become an O, Z beomes an S, and M or N become H, etc. when you're guessing - you go by the shape of the letter, not what you are actually seeing.

    May 05 04, 10:03 AM
    gmackematix

    		And I believe they are called Snellen charts after a Dutch ophthalmologist.

    May 06 04, 7:19 PM

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