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https://protectingsight.com/2020/09/25/protecting-sight-104-why-we-must-confront-hard-historical-truths-acute-retinal-necrosis-yag-pis-and-memories-of-president-lincoln-o-captain-my-captain/
Protecting Sight #104: Why we must confront hard historical truths. Acute retinal necrosis, Yag PIs, and Memories of President Lincoln: O Captain! My Captain!