Conal anaesthesia: a new approach to retrobulbar anaesthesia.

We have set out critically to assess the current percutaneous technique of retrobulbar anaesthesia. Access to the confined space within the muscle cone is limited by the globe itself and the medially directed lateral orbital wall. By approaching the retrobulbar muscle space with a curved needle through the inferior conjunctival sac these anatomical constraints are overcome. This technique is referred to as conal anaesthesia. A quantitative comparison of the two techniques demonstrates that the conal approach produces more reliable and effective muscle block with faster onset of action than conventional percutaneous anaesthesia. The conal approach is safe and offers advantages with its ease of application, excellent anaesthesia and akinesis and through its rapid and consistent results.