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. Author manuscript; available in PMC: 2022 Sep 1.
Published in final edited form as: Ophthalmol Glaucoma. 2021 Jan 30;4(5):463–471. doi: 10.1016/j.ogla.2021.01.004

Figure 4:

Figure 4:

Barplot of subconjunctival aqueous shunts placed ab externo and trabecular bypass shunts placed ab interno (iStent). The data from 1994 to 2011 were derived from a universe of Medicare claims data and the values from 2012-2017 from both Medicare claims and the CMS payment data to individual physicians. The approval of the iStent device is indicated by the highlighted background starting in 2012.