What a brilliant idea - create glasses that have adjustable prescriptions through the use of a variable fluid membrane. Basically, you inject fluid, or take fluid to change the concavity or convexity of the lenses (and therefore the level of correction).
"They require very little training to dispense, can be dispensed by an organisation's volunteers in the field, they only need to be delivered once and can make a difference for years afterwards, and are inherently safer (and less valuable on the black market) than items such as prescription medications."
http://gizmodo.com/5463368/how-oil+filled-lenses-are-bringing-sight-to-those-in-need
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