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Three-dimensional quantification of the symmetry of normal facial movement
Susan E Coulson1, Glen R Croxson, Wendy L Gilleard
1Private Practice of Physiotherapy, Royal Prince Alfred Hospital, Sydney, Australia. slink@zeta.org.au
Objective:
This study examined the right to left symmetry of the displacement of three-dimensional movement of the human face.
Methods:
Displacement data on 42 subjects was collected and analyzed with the Expert Vision Motion Analysis System. Right and left three-dimensional facial displacements were quantified.
Results:
Significantly greater left than right three-dimensional displacement across the whole face was measured. The three-dimensional displacement difference ranged from 0.48 mm to 2.28 mm between the right and left sides of the face. The 2-cm inferior pupil markers during the nose wrinkle expression had significantly greater left than right displacement.
Conclusion:
The ranges of displacement differences, along with the mean three-dimensional displacement measures, must be accounted for in the creation of a baseline of the range of normal facial movement.