Possible to hit a vein or blood vessel in the chin which leads to the vision? Can I get blind?

This scenario would be extremely rare with an injection into the chin. I agree with the other answers there's always a risk to procedures. Best wishes, Dr. Aldo

First, the chin is considered to be a low-risk area of the face for injecting dermal fillers. While the risk of injecting into the vascular system increases when it comes to other areas of the face, this is not something that would be typical at all. An experienced plastic surgeon will know how to safely provide you with dermal filler injections while avoiding veins and blood vessels. In the rare event that some filler is injected into a vein, a surgeon can use dissolving agents or massage to minimize any risk of complications. 

There is always the potential risk for filler injection to cause an occlusion although it is extremely rare.  Best of luck.

Vascular occlusion leading to visual loss is extremely rare. The most common areas for this are the NLF, glabella, temples, nose, and under eye. The chin is not a common area for this rare event. It is almost impossible for a filler to cause visual loss from a chin injection because the length the filler needs to travel is much longer than the other areas mentioned. I use cannulas for this injection always and this will significantly decrease the risk of vascular occlusion.

A vessel may be encountered with any type of injection (unfortunately we can't see through the skin). Experienced injectors know to avoid the midline areas of the upper and midface - specific areas mentioned below by Dr. Weiner - because of the vascular networks communicating with the central retinal vascular pathways. Slowly injecting the filler avoids a bolus of material being pressured into a vessel and allows the injector to observe the color of the surrounding skin as the filler is injected. If blanching of the skin occurs, the injector stops the procedure and massages. Hyaluronidase is an option to break down the HA fillers if a vascular complication is suspected. Smoking, vascular disease, and other clotting abnormalities are more likely to cause blindness than having filler injections - still a very rare event. The chin is a low risk zone for vascular complications. Once the filler is safely in place, it's safe to say you don't have to live in fear of awakening without your vision. Best wishes.