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Schematic illustration of the (a) normal eye, (b) plateau iris eye, and (c) pupillary block eye | a) Normal eye. The blue arrow demonstrates the direction of aqueous outflow and the black arrowhead represents the structure of anterior chamber angle. b) Plateau iris eye. It shows convex iris contour and the structure of angle was occluded by the peripheral iris. c) Pupillary block eye. It shows the anterior positioning of the ciliary process and a narrow angle. | Chen, Y. Y., Chu, D., & Chou, P. (2015). Enhancing the early differential diagnosis of plateau iris and pupillary block using a-scan ultrasonography. PloS one, 10(2), e0118811. https://doi.org/10.1371/journal.pone.0118811