Fig. 1From: Sulfur hexafluoride (SF6) versus perfluoropropane (C3F8) tamponade and short term face-down position for macular hole repair: a randomized prospective studyThe shape of the hole approximately resembles a truncated cone. To calculate the volume (V) of the macula hole we used the minor diameter (d), the major diameter (D) and the height (H) of the holeBack to article page