Optical Coherence Tomography (OCT) is a non invasive tool used to image the retina. OCT lets the doctor evaluate the cross-sectional images of the retina. This is a revolutionary tool in evaluating and managing different retina problems including macular holes, degeneration, macular swelling, epiretinal membranes, vitreo-macular traction, and optic nerve damage. 

OCT has many clinical applications and is extremely useful  in detecting retinal and macular diseases even before these diseases are obvious by examination alone. It is also used to detect changes in retinal disease for e.g. quantitatively examining the thickness of the macula. Consequently, it is a crucial tool in detecting and treatment of retinal diseases like diabetic macular edema and macular degeneration.