A CAPTCHA puzzle is one way to enforce that certain actions need to be carried out by a real person. However, CAPTCHAs are visual, depending not just on a person's seeing the image but also on a person's being able to recognize distorted letters and numbers. Suggest another method usable by those with limited vision
What will be an ideal response?
One
very
common
method
sites
use
to
address
this
problem
is
playing
a
spoken
word.
If
something
more
complicated
is
needed,
the
system
can
play
audio
of
a
simple
math
problem
that
any
real
user
could
solve.
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