My Ophthalmological experience and knowledge is "modest."
York 310 is the ABer that will give you good advice.......
Here are my comments which I hope may be helpful.
It is extremely unlikely that the injection material did not go into the vitreous as this procedure is common in Ophthalmological practice and the doctor had done the procedure on many occasions and on this occasion, the only difference being in technique was one of a different type of retractor.
Again, in expert hands it is extremely unlikely that the material went onto the eye socket,as the needle would have to have missed the eye completely........extremely unlikely.
I do not think it necessary to experience"bubbles" or "flooding" to guarantee a successful site injection.
In the unlikely event of the injection not going into the vitreous, I am sure that the omission of one injection would not give the "green light" to the sudden abnormal growth of annoying blood vessels.
If it was my wife..........I wouldn't worry.
York310 will give a more professional appraisal to your question.