Optical Coherence Tomography (OCT) is a new imaging technology that allows for measurement of the thickness of the retina and visualization of the different retinal layers. The retina is located at the back of your eye. OCT takes cross-sectional pictures of the retina. It a fast non-contact and non-invasive procedure. OCT is used to diagnose certain eye conditions and diseases, such as age-related macular degeneration and macular puckers, macular edema, and macular holes.