Optical coherence tomography, also called OCT, is a method for imaging the various layers of the retina, the optic nerve head, and the anterior segment of the eye. Similar to ultrasound, individual layers of tissue are scanned without touching the eye and displayed as a cross-section. A completely safe light source is used. A typical example of an OCT image of the retina is shown below.

The examination lasts a few seconds, does not require the administration of drugs, and is totally painless.

OCT supports the eyecare professional in diagnosing a disease and monitoring change over time. The OCT is particularly useful for issues concerning fluid retention and swelling in the retina, which can occur, for example, with age-related macular degeneration (AMD) or diabetes. But very early signs of a pathological change can also be detected.