ABSTRACT
Anterior segment optical coherence tomographer (AS-OCT) is a less commonly performed aspect of OCT. It provides an anatomical cross section of the anterior segment. The application of AS-OCT is typical for cornea, iris and lens abnormalities, particularly changes in morphology. The technology used to capture AS-OCT is identical to that used in more common posterior segment OCT. There are fewer commercially available devices dedicated to AS-OCT; some provide the capability as a software/lens add-on to a posterior segment device. The anatomy imaged in an AS-OCT includes the limbus, ciliary body, iris, pupil, lens, anterior chamber, angle, and cornea with the following layers: air/tear interface, tear film, epithelium, stroma and endothelium. One characteristic unique to AS-OCT imaging can be helpful when imaging; when the image is centered on the apex of the cornea, there will be a reflection that will appear as a vertical line on the image called the corneal reflex.
