Cell phone cameras used to detect pulse waves and impute blood pressure have not become a viable technology.

“you know there was a period of time where people were using a cell phone camera and you could press your finger on the camera and that it could basically detect the pulsation it could almost calculate a a you know a pulse wave and it could give you a sort of imputed systolic and diastolic blood pressure that never made it obviously we don't we're not seeing those around”