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This work discusses the rheology of several vitreous humour (VH) substitutesused in eye surgery (perfluorocarbons and silicone oils) and their flowbehaviour when subjected to saccadic eye movements. Shear rheology experimentsrevealed that all fluids tested exhibit a constant shear viscosity, whileextensional rheological experiments showed that Siluron 2000 is the only fluidtested that exhibits a measurable elasticity. To characterise the dynamicsduring saccadic eye movements, numerical simulations of all the VH substitutesunder study were performed with the open source software OpenFOAM and comparedwith Vitreous Humour flow dynamics to assess their potential mechanicalperformance. Minor differences were found between the numerical results of aviscoelastic fluid reproducing the rheology of Siluron 2000 and a Newtonianmodel. Perfluorocarbon (PFLC) shows a distinct flow behaviour relative toSilicone Oils (SiO). None of the pharmacological fluids tested can adequatelymimic the rheological and consequently the flow behaviour of VH gel phase(Silva et al., 2020).

Rheological behaviour and flow dynamics of Vitreous Humour substitutes used in eye surgery during saccadic eye movements