Kassm Tala, Freeman Dylan, Open or Closed?, International Journal of Glaucoma, Volume 1, Issue 1, 2020, Pages 1-1, ISSN 0000-0000, https://doi.org/. (https://oapgroup.org/ijg/article/1243) Abstract: A brief educational piece clarifies open‑angle versus angle‑closure glaucoma mechanisms, risk factors, and screening considerations. It provides practical pointers for early detection and referral. Keywords: silicone oil; ahmed tube shunt; clog tube