A method, and a related device, for obtaining the blood pressure of a person. The method comprising steps of providing a light source, and an optical sensor configured to detect light from the light source which has propagated through the wrist of a wearer of the device. The amount of light propagating through the wrist depends on the amount of blood in the wrist. Blood pressure is then observed by monitoring the difference in the amplitude of blood pulsation within the wrist when the wrist is lifted above heart level, and when the wrist is lowered below heart level.一種用於測量個體血壓的方法和相關的裝置。所述方法包括提供一光源以及一光源感測器;當將所述裝置穿戴於使用者手腕時,光源感測器用以偵測來自所述光源而傳播通過上述手腕的光線。光傳播通過手腕的量取決於手腕的血量。接著藉由監控當手抬到心臟上方時以及移到心臟下方時,血液搏動的振幅差異來測定血壓。100‧‧‧血壓監控器101‧‧‧光源103‧‧‧光學感測器105‧‧‧壓力感測器
