This is a complication that is extremely rare but there are over 100 cases of this occurring with all fillers, including fat, and not just Restylane. Minimizing this risk can be done:Experience injecting physicianUsing blunt tipped cannulas that are 25g or largerA constant movement of the cannulaSlow injection of fillerNo bolus of fillerI do this procedure about 5 times per day with cannulas and feel very comfortable doing this. You must seek out experienced physicians for this area. I get the most questions on Realself about bad outcomes from this injection, usually reversible.Unfortunately, blindness from this complication is not usually reversible.