The silver rimmed lenses are fitted in medium thickness black
plastic frames. They are not as chunky as the really geeky ones
but what makes them unusual is the perfectly windows.
The glasses have been developed for those parts of the world
where
conventional spectacles are simply too expense for ordinary
people to afford. This invention makes it possible to issue
people with glasses without the need for sight test equipment, a
large stock of different lenses or the facilities fit them into
frames. The idea is that with a little help, people will be able
to adjust the glasses to their own requirements.
So far as I can tell, The lenses only adjust to + values, so the
invention possibly only helps the long sighted. The device has
recently been trialed in Ghana where the reaction of those who
tried the glasses was very positive. John Silver is now looking
for a commercial backer to fund full scale production. I can’t
help thinking that there must be many other applications for his
invention - but it may be a few more years until we see the
results.