A wearable device for healthcare and method for using the device. More specifically, the wearable device is worn on a finger for measuring the health data of the user, selected from one or more of heart rate, blood oxygen saturation, heart rate variability. Based on the measured data, the sleep quality can be monitored and recorded. Disorders such as obstructive sleep apnea, can be detected. The wearable device may include an optical sensor coupled with or embedded in a main body including a visible light emitter, an IR light emitter and a light detector being arranged along a longitudinal direction of the finger. During operation of the wearable device, the heart rate is monitored based on a detected light signal.本發明揭示了一種用於健康護理的可穿戴設備及其方法。可穿戴設備佩戴於手指上以測量用戶的健康數據，可包括心率，血氧飽和度，心率變化率等。基於測量的數據，即可監測和記錄用戶的睡眠質素，從而能夠發現用戶存在的睡眠障礙問題。可穿戴設備可包括，耦合或嵌入於主體之光學感應器，其沿手指縱向方向安置的可見光發射器，紅外光發射器以及光學感應器。可穿戴設備還可包括匹配單元用於引導用戶正確佩戴可穿戴設備並減少其旋轉，此外，可穿戴設備的主體具有一個預設形狀用以當主體戴在手指上時可以在手指上產生一個朝向其側面區域的力。
