Fig. 8. Perfluoro-octane (PFO) is injected through a blunt-tipped 25-gauge needle positioned 1 to 2 mm in front of the optic disc. (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)