Viscoelastic properties of the cornea are derived from an ophthalmicmeasurement signal representing velocity as a function of time of a contactproberebounded by the eye. The viscoelastic properties include a "Lost EnergyRatio"(LER), a "Time Shift" (TS), a damping parameter (a), and an elastic parameter(i).An improved method for determining intra-ocular pressure from the measurementsignal is also disclosed, wherein a first derivative of the measurement signalat amoment in time when velocity of the probe is zero due to contact of the probewiththe cornea is calculated and correlated to an intra-ocular pressure value.
