Disclosed are head-mounted personal multimedia systems and visual assistance devices thereof, which are featured with a diopter adjustment unit to configurably provide various diopters for the user’s eye(s) to watch. In order to watch clearly the picture displayed by a fixed-range display surface, the user’s eyes can perform physiological accommodation movements in response to the diopters dynamically configured by the diopter adjustment unit, so that the eye fatigue could be prevented.揭露一種頭戴式個人多媒體系統與視覺輔助裝置，其中屈光度調整單元可調整地提供多種屈光度予使用者之眼睛以進行觀看。因應屈光度調整單元所動態提供的多種屈光度，使用者的眼睛皆可相應地進行生理調節運動，以清楚地觀看固定顯示面所顯示之畫面，而減緩眼睛疲勞。
