Can Botox Migrate to the Retina if Injected on the Forehead and Cause a Blind Spot?

BOTOX is injected into muscles of facial expression and primarily affects the location it is injected.  A small amount of the agent can spread in the blood stream to cause systemic side effects.  These are minimal for cosmetic treatments.  There effects are primarily associated with injecting BOTOX for medical reasons.  Blindness is not a known side effect of this agent.  So rest assured that your treatment will not cause blindness.  However, there are a variety of reasons that you might experience sudden changes in your vision unrelated to BOTOX.  If you are experiencing a change in your vision you are advised to immediately seek assessment by an ophthalmologist.  If you can't arrange this, go to an emergency room.  They will assess you and have you seen by an ophthalmologist if this is warranted.

No. Botox will not affect the visual part of the retina. It works by preventing nerve communication with muscles that move. There are no moving muscles of the retina. Botox is not a thick liquid that could plug up a blood vessel and interfere with the retina's oxygen supply.

Embolization of Botox via the central retinal artery will not cause retinal injury. However, inadvertent injection of facial fillers into this artery can cause blindness. Rest assured that Botox is safe to inject into the forehead muscles and will not cause distal effects.