This article summarizes the physics, technology and clinical application of ultrasound biomicroscopy (UBM) and optical coherence tomography (OCT) for assessment of the anterior segment in glaucoma. UBM systems use frequencies ranging from approximately 35 to 80 MHz, as compared with typical 10-MHz systems used for general-purpose ophthalmic imaging. OCT systems use lowcoherence, near-infrared light to provide detailed images of anterior segment structures at resolutions exceeding that of UBM. Both technologies allow visualization of the iridocorneal angle and, thus, can contribute to the diagnosis and management of glaucoma. OCT systems are advantageous, being noncontact proceedures and providing finer resolution than UBM, but UBM systems are superior for the visualization of retroiridal structures, including the ciliary body, posterior chamber and zonules, which can provide crucial diagnostic information for the assessment of glaucoma. †Author Glaucoma is a disease that is essentially an optic neuropathy. Great strides have been made in the last decade in imaging the retinal nerve fiber layer and the optic nerve using optical coherence tomography (OCT). OCT is a noninvasive technique allowing the visualization and measurement of these structures for the assessment of glaucoma progression [1][2][3][4][5]. While damage to the optic and retinal nerves is responsible for the degradation of vision, in most instances this damage is associated with elevated intraocular pressure (IOP). Elevation of IOP results from an imbalance between the production and drainage of aqueous fluid, specifically, increased outflow resistance. Thus, assessment of the anterior segment plays a major role in the diagnosis and treatment of glaucoma.The traditional tools for the assessment of the angle and anterior segment are the slit-lamp and gonioscopy, in combination with a Goldmann contact lens and classification using the system introduced by Shaffer [6]. Several newer technologies now exist for imaging of the anterior segment, including scanning Scheimpflug (e.g., Pentacam, Oculus, Inc., Lynnwood, WA, USA), and scanning slit-lamp systems (e.g., Orbscan, Orbtek Inc., Salt Lake City, UT, USA). The Pentacam can provide rapid and reproducible measurements of anterior chamber depth and angle width [7], but is limited to visualization of only the angle approach. Scheimpflug photography also does not display the retroiridal structures or the ciliary body, which are of great interest in glaucoma diagnosis [8]. The scanning peripheral anterior chamber depth analyzer is another optically based system. It has high reproducibility in screening for narrow angles, as with other systems using visible light, but may have difficulty in assessing the bottom of the angle, as can be accomplished by OCT and ultrasound biomicroscopy (UBM) [9]. While these visible light systems are undoubtedly useful, especially for screening for narrow angles, OCT (based on near-infrared light) and UBM systems allow imaging of the full-angle anatomy and, in the cas...