A-scan ultrasonography image along the optical axis of an eye: Peaks correspond to cornea (C), anterior lens (AL) surface, posterior lens (PL) surface, and retina (R). Anterior chamber depth (ACD), lens thickness (LT) and axial length can be derived from A-scan ultrasonography. | 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

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