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.
Light intensity is inversely proportional to the square of the distance. A light that’s only a few microns away from your cornea would look incredibly bright even with minimal power.