Page 58 - Advanced concepts in orbital wall fractures

Chapter 3
Table 2 Mean, standard deviation (SD), minimum, and maximum of left and right orbital cavity total volumes and volume differences by gender.
Men Women
Mean SD
Right orbital volume (mL) 28.82 3.12 Left orbital volume (mL) 28.74 3.22 Absolute volume difference (mL) 0.45 0.36 Volume difference (%) 1.58 1.25
Mean SD
26.29 2.56 26.27 2.52 0.42 0.25 1.61 0.94
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Orbital Contour
The absolute mean distance for the left and right orbital cavities was 0.82 mm (SD 0.23 mm). The 95th percentile absolute distance was 1.91 mm (SD 0.55 mm). The average of all distance maps showed differences on the entire surface of the orbital cavity and no specific site was prone to asymmetry (Fig. 4). The intensity of the colours in Fig. 4 illustrate that the differences were limited to −2 and +2 mm in a few areas. Over most of the contour area, the differences were limited to 1 mm. Based on visual inspection of the individual distance maps of the orbital cavities, what stands out most is that the contour of the apex usually had the largest deviations.
Figure 4 Lateral, medial, bottom, and top views of the average distance map of left-versus-right differences of the orbital contour (colour intensity illustrates the degree of average difference in millimetres).