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. 2021 Jun 14;35(12):3202–3221. doi: 10.1038/s41433-021-01595-x

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a-1 The Ahmed^® Glaucoma Valve showing its components and valve mechanism, where Section A represents the larger inlet port of the integrated Venturi chamber, and Section B represents the smaller outlet port of the Venturi chamber [40]. a-2 Silicone models of the Ahmed® Glaucoma Valve: (2i) Ahmed^® Glaucoma Valve Model FP7; (2ii) Ahmed^® Glaucoma Valve Model FX1; (2iii) Ahmed^® Glaucoma Valve Model FP8; and (2iv) Ahmed^® Glaucoma Valve Model PC7—Ahmed^® FP7 with Pars Plana Clip [41]. b The Ahmed^® ClearPath Glaucoma Drainage Device: (i) model CP350; and (ii) model CP250 [60]. “SA” stands for surface area of the end plate.