| Description | For injecting anesthetics into the muscle cone. 23G x 1 1/2 in (.60 x 38mm) | For administering local anesthetic prior to ophthalmic surgery. 27G x 1 1/4 in (.40 x 32mm). May also be used for retrobulbar administration. | For administering anesthetic agents into the posterior sub-Tenon's space 20G x 1in (.90 x 25mm) |