Double vision following
injection eye anesthesia is not at all rare. I have done research and published three scientific papers on the subject:
81. “Diplopia Cases After Peri-bulbar Anesthesia without Hyaluronidase”, Hagan III JC, Whittaker TJ, Byars SR Journal of Cataract & Refractive Surgery, 25:1560-61, 1999
82. “Diplopia and Ptosis Following Injection of local Anesthesia Without Hyaluronidase”, Jehan FS, Hagan III JC, Whittaker T, Subramanian M.