If a physician uses how you want to acid to improve the appearance of somebody's nose, they must be familiar with the vascular anatomy of the nose. Since hyaluronic acid is a gel, not a liquid, it has the potential to block blood vessels. I believe the blindness is the result of inadvertent injection into the lumen of a vein that may drain into the retina. This is one of the many reasons we are advocates of permanent nonsurgical nose job treatments with microdroplet Silikon 1000. Silikon 1000 never leads to blindness, necrosis, embolus, infection, or stroke. This is simply because the size of a silicone 1000 molecule is smaller than a red blood cell. Thank you for your question. Sincerely, Dr. Joseph