arly in 1893, Neuber discovered the autologous fat grafting for unilateral facial atrophy. 1 Skin rejuvenation and soft tissue augmentation by cosmetic facial filler injection have gained more and more popularity. Fat has been used as filler in other body regions as well as the facial area. Some devastating complications following the facial filler injection, such as iatrogenic visual loss 2-4 and cerebral infarction, 5,6 have been reported. In 2014, a national survey of facial filler injection conducted by Korean Retina Society revealed a series of 44 patients who had diffuse or localized iatrogenic occlusion of the ophthalmic artery and/or its branches. Ophthalmic artery occlusion accounted for 38.6% of all the complications. 7 It is also notable that compared with artificial materials (hyaluronic acid, collagen, etc), use of autologous fat resulted in worse visual prognosis and higher incidence of combined brain infarction. 8 Autologous fat filling may cause blindness and brain lesion 9 ; however, the exact causative component of the fat tissue remains mysterious. Perhaps it is the fat lipid that eventually blocks the blood supply to the eyes and brain; alternatively, fat tissue as a whole or the fat granules could be the real causative factors resulting in complications. The explicit mechanism underlying the occurrence of ophthalmic complications is also under exploration; however, it is generally IMPORTANCE Complications caused by autologous fat filling have been reported. Comprehensive knowledge of the possible adverse effects of autologous fat filling is needed. OBJECTIVE To determine the association of autologous fat filling with ophthalmic function complications. DESIGN, SETTING, AND PARTICIPANTS Four adult New Zealand white rabbits were killed for a facial anatomy study. Sixty-four adult New Zealand white rabbits underwent fat harvest using the Coleman technique. Autologous fat was minced or digested with collagenase 1 and centrifuged to separate fat lipid and fat granules. Either 0.2 mL or 0.4 mL of minced fat, fat granules, fat lipid, or saline (control) was retrogradely injected into the facial artery of rabbit models. Electroretinography and ophthalmic fundoscopy were performed to measure the retina and fundus artery occlusions 2 weeks after surgery. MAIN OUTCOMES AND MEASURES Visual impairment, blindness, and death. RESULTS Injection of 0.2 mL of fat granules, fat lipid, and saline resulted in 100% (8 of 8), 62.5% (5 of 8), and 0 ophthalmic complications, respectively; and 0.4 mL resulted in 87.5% (7 of 8), 12.5% (1 of 8), and 0 ophthalmic complications, respectively. Injection of 0.2 mL and 0.4 mL minced fat led to 100% (8 of 8) ophthalmic complications and death, respectively. The mortality rates were 37.5% (3 of 8), 12.5% (1 of 8), and 0 for 0.2 mL emboli injection, and 100% (8 of 8), 50% (4 of 8), and 0 for 0.4 mL, respectively. CONCLUSIONS AND RELEVANCE In this study, minced fat injection was associated with more ophthalmic complications than injection of fat granules and fat lipid. Increasing...