Joshua Silver – a retired Oxford professor – has developed a kind of eyeglasses that can be easily ‘tuned’ for a particular individual in the field. This is possible because the glasses contain sacs of liquid silicone and have syringes attached, allowing fluid to be added or removed. Changing the quantity of fluid effectively adjusts the kind of correction provided by the lenses, allowing them to address any degree or short- or long-sightedness.
10,000 pairs have already been distributed in Ghana, and there are plans to distribute 1,000,000 in India in 2009. Silver ultimately aims to produce enough glasses for 100 million people a year.