Before you get too excited about the technology's development, it should be noted that it has thus far only been tried in lab cells. But that does not mean it couldn't be tested in humans once proved safe.How does it work? The device identifies cellular byproducts in tears called exosomes that are thought to indicate tumor growth somewhere in the body.The lenses are equipped with an antibody that can spot and latch onto another antibody found on these exosomes. When these two antibodies come together, they turn red.

https://interestingengineering.com/innovation/scientists-contact-lenses-identify-tumors-from-tears

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