Fig. 3. The relationship between intraocular bubble volume and the extent of the retina–gas interface as determined by computed tomography in the human eye compared with a model eye. (From Hilton GF, Grizzard WS: Pneumatic retinopexy: A two-step outpatient operation without conjunctival incision. Ophthalmology 93:626, 1986. Published courtesy of Ophthalmology.)