Anatomic Variability of the Human Orbit.

Our data suggest that the average normal asymmetry between the right and left orbital volumes is 0.8 mL, which is 50 to 80% of the orbital volume increase implicated in traumatic enophthalmos. Of the skulls, 17 (14%) showed a right-to-left orbital volume asymmetry of 1.5 mL or greater and 25 (21%) showed an asymmetry of 1.0 mL or greater. The skull-to-skull orbital volume range approached 200%. Thus, this study provides surgeons with important information to consider when reconstructing a traumatized orbit using a computed tomography scan of the unaffected, contralateral orbit.