OCT is a noninvasive imaging technology used to obtain high-resolution cross-sectional images of the retina and optic nerve. This procedure is similar to ultrasound technology except the imaging is performed by light rather than sound. This enables the analysis of the retinal and nerve fiber layers for glaucoma, age related macular degeneration,  diabetic retinopathy, stroke, multiple sclerosis and many other conditions. At our office, we use a Zeiss Cirrus OCT because of the precision to detail it allows us. Zeiss OCT has algorithms for progression analysis software which allows for very early detection of disease processes.