Optical Coherence Tomography (OCT) is a non-invasive imaging device used in ophthalmology to obtain high-resolution cross-sectional images of the retina and other internal eye structures. It uses light waves to scan different retinal layers and detect abnormalities that may not be visible during routine eye examinations. OCT is widely used for diagnosing and monitoring eye diseases such as glaucoma, macular degeneration, and diabetic retinopathy. It also helps measure retinal thickness and track disease progression over time. The device is commonly used in ophthalmology clinics, hospitals, and specialized eye care centers and typically consists of an optical scanning unit, patient chin rest, display monitor, and electronic imaging system.