[tig] eye charts
Mon Nov 22 22:33:53 GMT 2004
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?
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