Elasticity, viscosity, and deformation of orbital fat.
OBJECTIVE
For development of a finite element analysis model of orbital mechanics, it was necessary to determine the material properties of orbital fat and its degree of deformation in eye rotation.


METHODS
Elasticity and viscosity of orbital fat of eight orbits of four calves and two orbits of one rhesus monkey were measured with a parallel-plate rheometer. The degree of deformation of orbital fat was studied in two human subjects by magnetic resonance imaging (MRI) through the optic nerve in seven (first subject) or fourteen positions of gaze from left to right. Bifurcations of veins in the fat were used as markers for displacement of the fat.


RESULTS
The elastic shear modulus (G') of calf orbital fat was between 250 Pa and 500 Pa, and of monkey orbital fat it was between 500 Pa and 900 Pa. The viscous shear modulus (G'') of calf orbital fat was between 80 Pa and 150 Pa, and for monkey orbital fat it was between 300 Pa and 500 Pa. In the MRI scans, it was found that markers in the fat, 1 to 5 mm posterior to the sclera, rotated with the eye for 36% to 53% of eye rotation; the remainder was accounted for by sliding of the eye within the Tenon capsule and within the orbital fat.


CONCLUSIONS
Elastic and viscous shear moduli of orbital fat are low. Little energy is dissipated in the fat. The required deformation of the fat during eye rotation is limited because the eye slides, to some extent, within the Tenon capsule.
Schoemaker
Ivo
I
Department of Biomechanical Engineering, Delft University of Technology, Delft, The Netherlands.
Hoefnagel
Pepijn P W
PP
Mastenbroek
Tom J
TJ
Kolff
Cornelis F
CF
Schutte
Sander
S
van der Helm
Frans C T
FC
Picken
Stephen J
SJ
Gerritsen
Anton F C
AF
Wielopolski
Piotr A
PA
Spekreijse
Henk
H
Simonsz
Huibert J
HJ
D000273:Adipose Tissue / Q000502:physiology*; D000328:Adult; D000818:Animals; D002417:Cattle; D004548:Elasticity; D005133:Eye Movements / Q000502:physiology; D005260:Female; D006801:Humans; D008253:Macaca mulatta; D008279:Magnetic Resonance Imaging; D008297:Male; D009915:Orbit / Q000502:physiology*; D014783:Viscosity