IJG International Journal of Glaucoma 0000-0000 Open Access Pub United States IJG-20-3131 Clinical Case Image Open or Closed? Tala Kassm 1 Dylan Freeman 1 * Medical University of South Carolina Storm Eye Institute Correspondence: Dylan Freeman, Medical University of South Carolina, Storm Eye Institute, Charleston, SC, USA; Email: freemady@musc.edu.

The authors have declared that no competing interests exist.

 13 01 2020 1 1 1 1 17 12 2019 05 01 2020 13 01 2020 © 2020 Tala Kassm, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://openaccesspub.org/ijg/article/1243

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.

 silicone oil ahmed tube shunt clog tube Caption

74 year old male with a history of multiple retinal detachment repairs with silicone oil and subsequent Ahmed tube shunt placement for uncontrolled pressure now presents with recurrent uncontrolled pressure in the right eye (seen below).

Intraocular pressure is not controlled with maximum topical and oral medications. Is silicone oil blocking the tube? Would oil removal and tube flushing improve his eye pressure?