VisionScienceList: letter order in snellen test

From: julian ()
Date: Mon Jul 23 2001 - 05:15:46 PDT

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I am looking for information regarding the order of the letters in visual
acuity tests e.g snellen, sloan,etc.

Is there a particular reason or logic behind the order of the letters? and
could anyone point me to some literature on the subject?

thanks very much

julian weaver

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