Optical Coherence Tomography
Optical coherence tomography (OCT) is a diagnostic imaging technique that is used to map and measure the thickness of the retina and optic nerve. It uses reflected light to generate cross-sectional images of the part of the eye of interest. OCT is a quick, non-invasive and non-contact procedure that can provide fine details of each layer of the retina and changes to the optic nerve.
The imaging can be performed with pupils undilated, but sometimes dilation is needed to obtain better quality images. A beam of light is passed on the eye from an OCT system. The system scans your eye for a few seconds. The light that is reflected is captured by detectors and produced into an image.
OCT is used in the diagnosis of diabetic retinopathy (damage of retina in diabetics), age-related macular degeneration (deterioration of the centre of the retina), macular oedema (accumulation of fluid within the retina), central serous retinopathy, macula hole, vitreomacular traction syndrome, other retinal disorders and glaucoma.