Figure 1.

The setup used to measure ocular compliance. (A) Schematic of the experimental setup, showing relevant components. (B) Lumped parameter (equivalent circuit) model of the setup, with blue shaded region indicating the eye. Parameters are defined as follows: P_a, applied pressure; P, measured pressure; Q, measured flow rate; Q_s, flow rate into the compliance of the system; Q_ϕ, flow rate into the compliance of the eye; Q_r, flow through the aqueous humour outflow pathway of the eye; R_q = 1/C_q, combined hydraulic resistance (inverse of hydraulic conductance, C_q) of the flow sensor and capillary in series; R_c, hydraulic resistance of the cannula; R = 1/C, hydraulic resistance of the outflow pathway (inverse of outflow facility, C); ϕ_s, compliance of the measurement system; ϕ, compliance of the eye. Note that ϕ and R are strongly pressure-dependent.