However, there is another unusual way to power the battery. "Tear solution also contains glucose. That means, while you're wearing the contact lens, your tears can also charge the battery," Lee said.

Of the 140 million contact wearers worldwide, 30%-50% suffer from CLIDE. The problem arises from the insufficient flow of tears from the contact lens's outer surface to the surface behind the lens.

Clearly, there’s more to tears than meets the eye. In a new study published in Clinical Proteomics, BYU professor of biochemistry Kenneth Christensen and former grad student Robert Roden detail a ...