Scientists invent micrometers-thin battery charged by saline solution that could power smart contact lenses::Scientists from NTU Singapore have developed a flexible battery as thin as a human cornea, which stores electricity when it is immersed in saline solution, and which could one day power smart contact lenses.
Contacts? Don’t you need to see for them to help
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Even totally blind people can usually detect light as painful, slightly less dark darkness. That’s actually why so many wear dark sunglasses