4 Editorial Commentary Page 1 of 4 Assessment of angle width using anterior segment optical coherence tomography Srinivasan Kavitha1, Nazlee Zebardast2, Rengaraj Venkatesh1 1Glaucoma Department, Aravind Eye Hospital, Pondicherry, India; 2Glaucoma Department, Mass Eye and Ear/Harvard Medical School, Boston, USA Correspondence to: Rengaraj Venkatesh, Chief Medical Officer, Aravind Eye Hospital, Pondicherry 605007, India. Email:
[email protected]. Comment on: Xu BY, Lifton J, Burkemper B, et al. Ocular Biometric Determinants of Anterior Chamber Angle Width in Chinese Americans: The Chinese American Eye Study. Am J Ophthalmol 2020;220:19-26. Received: 29 September 2020. Accepted: 25 October 2020; Published: 15 December 2020. doi: 10.21037/aes-20-129 View this article at: http://dx.doi.org/10.21037/aes-20-129 Introduction OCT). These imaging techniques help us to understand the pathophysiology of angle closure in a better way. Compared Primary angle closure glaucoma (PACG) accounts for to UBM, AS-OCT achieves higher resolution and does nearly half of glaucoma related blindness in the world with not require contact with the ocular surface. AS-OCT is a majority occurring in Asian populations (1,2). A range of noncontact, rapid imaging device that uses low-coherence phenotypes are recognized within the spectrum of primary interferometry to obtain cross-sectional images of the angle closure disease (PACD), namely primary angle closure anterior segment (4). The measurements obtained from AS- suspects (PACS, occludable angles with normal intraocular OCT are semi-automated, reproducible (5,6) and unlike pressure and optic disc), primary angle closure (PAC, gonioscopy these measurements are operator independent. occludable angles with features indicative of trabecular outflow obstruction or raised intraocular pressure but The swept source OCTs (SS-OCT), such as the Tomey absence of glaucomatous optic neuropathy) and finally CASIA SS-1000 (Tomey corporation, Nagoya, Japan), PACG (presence of glaucomatous optic neuropathy) (3).