Objective to measure the volumetric changes of enophthalmos of orbital blowout fractures, and to study the relation between the change of the orbital volume and the degree of enophthalmos.

Such deviation generates volumetric change in the solid, which will result in mechanical stresses if the ionic solid is under mechanical constraints, or if the defect distribution is not uniform.

The measurement of volumetric flow rate will be errors when the parameters of the temperature and pressure change unceasingly.