[tig] eye charts

Graham Collett grahamcollett
Tue Nov 23 19:48:09 GMT 2004

I also was having my eyes checked the other day ... Read everything
without problems down to 4k level and then got told I could use glasses
???  Was that a Snellen Wilcox chart ??

thanks to Cintel Inc. for support of the TIG.
waiting in the doctor's office the other day, I had the opportunity to
study the eye chart, in this case the Snellen Type plastic eye chart
also known as a Graham Field Chart.

I notice that certain letters are represented more than others, and
certain ones are left off completely.  You get the top "E" then "F P"
then "T O Z" then "L P E D", then 7 more lines, increasing on the 11th
line to 11 letters, which makes a total of 66 letters.  The letters not
represented are  A,B,G,H,I,J,K,M,N,Q,S,U,V,W,X,Y.  I wonder why
CDEFLOPRTZ are the only ones used?


Rob Lingelbach  
tig founder, coadmin
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