British inventor's spectacles revolution for Africa

"All users have to do is look at a reading chart and adjust the glasses
until they can see letters clearly," said Professor Joshua Silver, who
was last week shortlisted for a 2011 European inventor award at a
ceremony in Budapest. "Glasses like these are perfect for use in the
third world. We can send them to schools where teachers can direct
pupils to set their spectacles to suit each one's vision. It is as
simple as that."