Optical Coherence Tomography (OCT) is a non-invasive imaging technique that uses light waves to capture detailed images of the internal structures of the eye. It works by measuring the time delay and intensity of reflected light from different layers of tissue, allowing for high-resolution cross-sectional images. This technology is particularly useful in diagnosing and monitoring conditions like glaucoma and macular degeneration. OCT is widely used in ophthalmology due to its ability to provide real-time imaging without the need for injections or surgery. The images produced help doctors assess the health of the retina and other eye structures, facilitating early detection and treatment of various eye diseases.