This product is a replacement of snellen projectors. It is used when
you read the letters on the chart. There are key letters that are
expected and others that are not allowed. Already the software must
go through some basic checks.
1. Certain letters must show up while others can not.
2. Letters are not allowed to repeat on a given line.
3. Lines must contain 5 letters (provided the given system can fit
that many)
4. Lines must be completely random to prevent memorization (whether
it is accidental or not)
5. New: no recognizable words can show up (bad or good)
I have found that using a large enough pre-done list that meets the
qualifications above will do the job nicely.
Mark, could you tie this into a spell checker's database? I presume
spell checkers know how to spell bad words as well as good ones, so you
could reject any word that is found in the database.
Sarah
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