optical coherence tomography
Also written as: OCT — Optical Coherence Tomography
High-resolution cross-sectional imaging technique that uses light waves to visualize retinal and optic nerve structure.
Full Definition
Optical coherence tomography (OCT) is a non-invasive imaging technology that creates high-resolution cross-sectional images of the retina and optic nerve using interferometry of reflected light. In neuro-ophthalmology, OCT is invaluable for detecting and monitoring structural changes in the retinal nerve fiber layer, ganglion cell complex, and optic disc. The technique can identify subtle thinning that precedes visual field defects and provides objective measurements for tracking disease progression. Modern spectral-domain OCT offers enhanced resolution and speed compared to earlier time-domain systems, enabling detailed analysis of individual retinal layers and precise measurement of tissue thickness.
Usage
Usage note: Commonly abbreviated as OCT; specify type (spectral-domain, swept-source) when relevant.
In Context
- "Optical coherence tomography demonstrated significant retinal nerve fiber layer thinning in both eyes." — Imaging findings
- "Serial OCT measurements showed progressive ganglion cell layer loss over 12 months." — Longitudinal monitoring