Optical coherence tomography (OCT) is a non-invasive imaging test that captures detailed cross-sectional images of the retina and optic nerve. It is widely used to diagnose and monitor conditions such as glaucoma, macular degeneration, and diabetic eye disease. Before the scan, the eyes may be dilated to enhance image quality. The test itself is quick, painless, and does not involve physical contact with the eye. OCT provides high-resolution images that allow eye care specialists to detect subtle changes in retinal layers that may not be visible during a standard exam. These images are valuable for tracking disease progression and treatment response over time. OCT plays a critical role in early diagnosis and precise management of many retinal and optic nerve conditions.