Sure but oxygenation is strongly correlated with hemoglobin color, so it's very easy. Blood pressure, on the other hand, is very difficult to measure, and it f

Sure but oxygenation is strongly correlated with hemoglobin color, so it's very easy. Blood pressure, on the other hand, is very difficult to measure, and it fluctuates wildly based on a wide variety of confounding factors. It would be amazing if they figured out a way to get this information optically.