Different from a fat injection in both surgical technique and concept, a free fat graft uses fresh intact fat particles rather than liposuction cells, which are emplaced at multiple layers in the deep ocular depression site. Because the filling position is accurately controlled to avoid future fat displacementlocation, the physician needs to create an incision of approximately 1.5 cm at the upper eyelid, so it is generally conducted in conjunction with double eyelid surgery. Because fat particles used in autologous fat filling grafting are more intact than those in the fat injection, the overall viability rate is improved to above 60%. Besides, as each cell is examined under the naked eye by the physician for the internal structure before accurate filling, almost no fat lumps or unevenness and other rare complications are left after the operation. Fats are commonly harvested from the abdomen as the wound will be hidden near the umbilicus, leaving almost no scars. Likewise, a free fat graft is also used for the filling of the depression at the eye pouch and tear-through lacrimal grooves, which predominantly achieves prolonged and stable results.