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Optical Coherence Tomography (OCT)Optical Coherence Tomography (OCT) is, perhaps, the most promising technology available to produce images of the eye. During the simple procedure, a laser quickly scans the dilated eye. Unlike other imaging methods, such as ICG and FA, which produce top views of the retina, the image produced is a cross-section of the layers of the retina. Each of the thin layers of photoreceptors, nerve cells, and pigment epithelial cells are clearly delineated.
A high-quality image will show where abnormalities have occurred, such as the formation of drusen or new blood vessels, or the detachment or breakage of any of the retinal layers. OCT is an important tool for the diagnosis and treatment of many retinal conditions.
Below is an OCT showing a cross-section of the retina, revealing pockets of fluid (the dark areas "sandwiched" between the green layers of retina) under the surface.