This work presents a 128×128 multi-function CMOS vision sensor with motion direction detection (MDD) and simultaneous energy harvesting (EH) capability, featuring: 1) light weight template-based optical flow (OF) algorithm for on-chip MDD with high energy efficiency and small area overhead; and 2) independent imaging and energy harvesting (EH) operations using vertically stacked N+/PW and PW/DNW+DNW/PSUB junctions without photodiode reconfiguration. Fabricated in 0.18μm standard CMOS, this work demonstrates the first CMOS vision sensor featuring both MDD and EH modes within a compact pixel pitch of 4.75μm . With a power consumption of 10.5μW at 15fps in MDD mode, the chip prototype achieves a motion sensing figure-of-merit (MS-FoM) of 171 pJ/pixel ⋅ frame, which is 30% better than the state-of-the-art MDD sensors. The proposed EH configuration achieves continuous power generation at 267pW/lx/mm² irrespective of the imaging/MDD operation, demonstrating a 1.56× improvement over prior arts.