An assembly of devices that uses a broad-bandwidth light beam aimed into the eye for in vivo tomographic imaging and measurement of the retina, the retinal nerve fibre layer (its thickness), and optic disk in order to diagnose and manage retinal diseases. Reflected light is picked up by a detector that converts it into electrical signals using a computer and dedicated software, providing cross-sectional images of the retina or three-dimensional (3-D) volume scans. Optical coherence tomography (OCT) is used for visualizing the area/location of retinal-thickness abnormalities, macular holes or oedema, atrophy associated with degenerative diseases, glaucoma, and other retinal pathologies.