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Eight methods of non-invasive measurement of ICP at their respective positions on the eye. (ONSD = optic nerve sheath diameter, FVEP = flash visual evoked potentials, TDTD = two-depth transorbital Doppler ultrasonography, CRVP = central retinal venous pressure, OCT = optical coherence tomography, IOP = intraocular pressure measurement, A/V ratio = retinal arteriole and venule diameter ratio).
