"Diabetics could one day be able to monitor their blood sugar levels
using bionic contact lenses, instead of having to resort to painful
finger pricks. Researchers have developed
a fuel cell that runs on tears, which they say could power lens-mounted glucose sensors," according to
Chemistry World. "The idea of using lenses for diabetic monitoring has been
around for years,
as glucose levels in tears track blood glucose levels. An electrical
glucose sensor in a lens would be in constant contact with tear fluid,
and could produce readings for an on-the-spot display that could be
easily read by the wearer. But such a sensor would need a power source,
and so far this has proven a major stumbling block."
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