A gaze direction tracking system for an ophthalmic lens comprising an electronic system is described herein. The gaze direction tracking system is part of an electronic system incorporated into the ophthalmic lens. The electronic system includes one or more batteries or other power sources, power management circuitry, one or more sensors, clock generation circuitry, control algorithms and circuitry, and lens driver circuitry. The gaze direction tracking system is utilized to determine pupil position and use this information to control various aspects of the ophthalmic lens.本說明書中描述一種注視方向追蹤系統，其用於一包含一電子系統之眼用鏡片。該注視方向追蹤系統係為一併入該眼用鏡片中之電子系統的一部分。該電子系統包含一或多個電池或其他電源、電力管理電路系統、一或多個感測器、時鐘產生電路系統、控制演算法與電路系統以及鏡片驅動電路系統。該注視方向追蹤系統係用來測定瞳孔位置，並且使用此資訊來控制該眼用鏡片之各種態樣。
