Guo H, et al. - In patients with Posner–Schlossman syndrome (PSS), authors assessed the characteristics of intraocular pressure (IOP) dynamic change from episode to intermittent period. IOP crossover phenomenon in patients with typical PSS was confirmed by the dynamic observations of IOP in episodes and intermittent period and there is a probability of this observation to be important in the differential diagnosis of PSS. The IOP in the affected eye in episodes is higher than that of the contralateral eye statistically. In the intermittent period, the mean IOP, the peak, and the valley value of 24-hour IOP in the affected eye are statistically different with that of the contralateral eye.