Peribulbar injection is given in: September 2009

Ans. C: Periorbital space Retrobulbar anesthesia (RBA), a regional ophthalmic anesthetic technique, has been used for decades and consists of injecting a small volume (3-4 ml) of local anesthetic into the muscle cone of the eye. Owing to the occurrence of a wide range of complications associated with RBA, anesthesiologists and ophthalmologists began to turn to peribulbar anesthesia (PBA), which consists of introducing a needle into the extraconal space, as a theoretically safer form of regional ocular anesthesia. Peribulbar anesthesia (PBA) was formally described in 1986 and is based on the "tissue compament principle." The latter refers to the phenomenon wherein a needle is inseed into a compament and the local anesthetic injected spreads by viue of its pressure and volume throughout the compament. With PBA a relatively large volume (8-12 ml) of local anesthetic is injected into the extraconal space; to provide adequate analgesia and akinesis of the globe, the extraconal local anesthetic must spread to the intraconal space