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 commonly used in ophthalmology to diagnose and monitor conditions such as glaucoma, macular degeneration, and diabetic retinopathy. OCT can also be applied in other medical fields, including cardiology and dermatology, to visualize tissues and detect abnormalities. The procedure is quick, painless, and does not require any injections or dyes, making it a valuable tool for both patients and healthcare providers in assessing various health conditions.