[wardedVibe]

I remember seeing some results from a group using OCT imaging[0] that was on-par with a CGM, just bulky and requiring multiple high-end GPUs to actually run. So it's in principle possible, if nowhere near practical currently

[0]: pretty sure it was this https://pubs.acs.org/doi/abs/10.1021/acsnano.1c00497

[Retric]

I presume you’re thinking of something else?

That approach seems to require injecting nanoparticles and was tested in a simulation of skin not actual skin. Getting bio monitoring tattoo’s is a promising approach, but it’s more involved than just selling a watch.