Optical coherence tomography (OCT) is a non-invasive imaging tool used to diagnose and monitor the progression of retinal and optic nerve diseases, including glaucoma.

OCT uses beams of light to create high-resolution, three-dimensional maps of the optic nerve and measure retinal nerve fiber thickness. OCT also provides cross-sectional studies of the retinal structure, giving doctors precise and detailed images to aid in the discovery and treatment of ocular diseases, often in their earliest stages.