Two-quadrant high-volume sub-Tenon's anaesthesia for vitrectomy: a randomised controlled trial.

Background: Total volume using a standard single inferonasal injection for sub-Tenon's anaesthesia is limited by an increase in intraocular pressure (IOP) and commonly requires the operating surgeon to top-up the block intraoperatively. This study compares the efficacy and safety of a two-quadrant technique that allows the use of a higher volume of local anaesthetic.

Methods: 54 patients undergoing vitrectomy were randomised into two groups.