“In developing nations, where over half the population requires corrective lenses but often do not have the money to purchase them, Oxford Physics Professor Joshua Silver has a viable solution. Adaptive eyecare glasses are a liquid-filled alternative whose prescription can be altered at the time of fitting simply by adjusting the amount of injected liquid into the flexible membrane lens. By injecting more or less liquid using the attached syringes, the lenses become more convex (a stronger prescription) or concave (a weaker prescription). The patient, at the time of fitting, simply alters the amount of injected liquid while wearing the glasses, until they can see perfectly. The syringes are then removed, the lenses sealed, and the glasses are ready to wear. Each pair currently sells for just under $20 USD, though Joshua Silver, who is now director of the non-profit Centre for Vision in the Developing World at the University of Oxford, hopes to soon offer them for under $5.”
Not to mention they’re really stylish nowadays.
(via Athousandgreatideas)
