Medicine already trusts light with your life: the clip on your finger reading oxygen, the scan reading tissue, the laser correcting vision. But sensing is only half the loop — light collects the signal, then hands it to slow, hot electronics somewhere else, and the answer arrives after the moment that mattered.
The tell is on every wrist: billions of wearables sold, yet most disease is still caught by appointment. Continuous sensing without continuous understanding is just a very expensive diary.
Inside: why the sense-to-diagnosis loop breaks at the processing layer; what the wearables boom reveals about where health value lands; how logic that runs on light — reading the body and understanding it in the same instant — changes what monitoring means; and who is positioned to own real-time medicine.

This isn't medical advice. It's an industry map for the decade health goes from episodic to continuous — written for builders who want to see it first.

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