The Mechanical Properties of the Vitreous of Pig and Human Donor Eyes

Abstract

The influence of various external parameters on the mechanical properties of the vitreous of pig eyes as characterized by a spring constant D₀ and a friction constant r_z was investigated. For human donor eyes, D₀ turned out to be about 60% larger than in pig eyes, whereas the friction constant was increased by roughly 25%.

A New Method for the Determination of the Mechanical Properties of the Vitreous

“…However, the deviation for such a compli cated system as the vitreous body is not unexpected. More data obtained with spheres of different diameters will be presented in the subsequent paper [6] in which additional data derived from eyes of human donors are reported. The influence of extended storage in NaCl solution and in distilled water has also been investigated.…”

“…A better description is obtained with the assumption that the friction force increases with the square of the radius. Details will be given in the follow ing paper [6]. If one tries to define a viscosity according to Stokes law, one finds that the viscosity q is about 2 orders of magnitude larger than that of water and about 1 magnitude smaller than that of glycerine at room tem perature.…”

A finite element infant eye model to investigate retinal forces in shaken baby syndrome

“…The stiffest vitreous material, to approximately estimate an infant vitreous, that is measured and not based on an estimated guess [26][27][28], is from the work of Weber and Landwehr [39,55]. Other vitreous materials have critical issues with how the vitreous is handled, adversely compromising the stiffness, when measuring the viscosity [17].…”

Rheological properties of the vitreous and the role of hyaluronic acid

“…All specimens were tested between 3 and 48 h postmortem; storage as an intact globe for up to 60 h postmortem did not affect rheological results as observed previously (Weber et al, 1982). Eyes were gently dissected to remove the vitreous with minimal disruption.…”