Optical coherence tomography (OCT) is a non-invasive imaging technique that uses light waves to capture detailed images of the internal structures of the body, particularly in the eye. It works by measuring the time delay and intensity of reflected light from different layers of tissue, creating cross-sectional images that reveal the microstructure of the tissue. OCT is widely used in ophthalmology to diagnose and monitor conditions such as glaucoma, macular degeneration, and diabetic retinopathy. The technology provides high-resolution images, allowing healthcare professionals to assess the health of the retina and other ocular structures with precision, aiding in timely and effective treatment decisions.