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. 2022 Jun 9;9:906433. doi: 10.3389/fmed.2022.906433

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Copyright © 2022 Yang, Meng, Zhao, Chen and Luo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The determination of the concave and convex iris shape based on the anterior-segment optical coherence tomography (AS-OCT) or ultrasound biomicroscopy (UBM) images. (A,B) Concave shape iris: most part of iris locating behind angle-to-angle (ATA) with a concave shape of the iris pigment epithelium, referring to a “bowing” away from the cornea. And a wide sulcus could be detected in (B). (C,D) Convex shape iris: most part of iris locating before ATA with a convex shape of the iris pigment epithelium, referring to that the mid-peripheral iris pigment epithelium is “bowed” toward the cornea. Besides, convex shape iris with anteriorly positioned ciliary body was demonstrated in (D).