Fig. 10. Fluid-air exchange is performed with the cannulated extrusion needle in order to remove the infusion fluid anterior to the perfluoro-octane. (Freeman HM: Current management of giant retinal breaks and fellow eyes. In Glaser BM, Ryan SJ (eds): Surgical Retina, 2nd ed, pp 2313–2338. St. Louis, CV Mosby, 1994)