Sub-Tenon's Anesthesia.

The sub-Tenon's anesthesia block was reintroduced into clinical practice in the early 1990s as a simple, effective, and safe alternative to needle blocks. The technique has remained simple and effective but has evolved. Although still very unusual, both sight- and life-threatening complications have occurred. To safely perform the block, detailed knowledge of anatomy and methods for administering anesthesia are essential.