Optical Coherence Tomography (OCT) is a non-invasive imaging technique used in eye exams to capture detailed cross-sectional images of the retina, the light-sensitive tissue at the back of the eye. Similar to how ultrasound uses sound waves, OCT uses light waves to create high-resolution pictures that reveal the distinct layers of the retina, allowing eye care professionals to measure their thickness and detect abnormalities. This technology is particularly valuable for diagnosing and monitoring conditions like macular degeneration, diabetic retinopathy, glaucoma, and macular holes. The exam itself is quick and painless—typically taking just a few minutes—and doesn’t require direct contact with the eye. By providing such detailed structural information, OCT has become an essential tool in modern ophthalmology, enabling earlier detection of eye diseases and more precise tracking of treatment effectiveness over time.