A 68-year-old man developed strabismus after having sub-Tenon's anesthesia
for cataract extraction and intraocular lens implantation. An ipsilateral h
ypertropia with superior oblique muscle paresis developed in the operated e
ye. The hypertropia appeared 1 day after surgery and resolved 1 month later
. Although sub-Tenon's anesthesia is considered safer than other methods of
local anesthesia, strabismus may occur.