A selfie video might be all you need to find out your blood pressure, per a study by researchers in Canada and China. University of Toronto developmental psychologist Kang Lee and his postdoctoral researcher Paul Zheng developed a technology called transdermal optical imaging (TOI).

https://www.engadget.com/2019/08/07/blood-pressure-selfie-video-smartphone-research/?utm_campaign=fullarticle&utm_medium=referral&utm_source=inshorts