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Posterior vitreous detachment (PVD) in two patients. a, b Illustration and US image correlation showing a PVD. Note the undulating appearance of the posterior vitreous that is better identified on dynamic scanning (arrowheads). c Axial US in a 67-year-old man with blurred vision. Note the fine echoes in the retrohyaloid space (asterisk), consistent with retrohyaloid haemorrhage
