"A retired Oxford University physics professor, he came up with the idea in
what he describes as a "glimpse of the obvious".
Working on the principle that thicker lenses are more powerful than thin ones, Prof Silver's spectacles can be adjusted by injecting tiny quantities of fluid.
The tough plastic glasses have thin sacs of liquid in the centre of each lens.
They come with small syringes attached to each arm with a dial for the wearer to add or remove fluid from the lens.
Once the lenses have been adjusted, the syringes are removed and the spectacles worn just like a prescription pair.
The invention will enable millions of people in poorer parts of the world, where opticians are in short supply, to get spectacles for the first time"
i do not see how this technology can produce negative lenses. what am i missing?
Posted by: William Wolfe | June 25, 2009 at 02:11 PM