Abstract:  Anterior segment optical coherence tomography (AS-OCT)  is an imaging instrument developped after ultrasound biomicroscopy (UBM). Moreover, AS-OCT is a non-invasive and non-contact instrument with a higher resolution than UBM. AS-OCT offers anterior segment images of the cornea, anterior chamber, anterior chamber angle, iris and lens. In this article, the value of AS-OCT is evaluated in the diagnosis and treatment of primary angle closure glaucoma (PACG), including the application of AS-OCT in observing the differences between PACG and normal controls, the changes in anterior segment configuration after peripheral iridectomy/trabeculectomy/ cataract surgery in PACG, and the morphology of filtering blebs after trabeculectomy. The present study showed that AS-OCT  would play an important role in the diagnosis, treatment choice and pathogenesis study of PACG. (Ophthalmol CHN, 2013, 22: 1-5)