1. A skilled endoscopist is essential, but the equipment can be as simple as a standard endoscope and an injection needle.

2. An injection device (1) is disclosed, into which an ampule (4) with a piston (5) and an injection needle (6) may be interchangeably set.

3. The anatomic relationship of an injection needle as traditionally placed in retrobulbar anesthesia to optic nerve, orbital vessels and eye muscles is demonstrated by computed tomography.