What is Optical Coherence Tomography (OCT)? - Glaucoma Glossary

OCT is a non-invasive imaging test that uses light waves to take cross-sectional pictures of the retina and optic nerve, allowing micron-level measurement of nerve layer thickness.

What it means for the patient

This is a completely painless scan that takes a highly detailed 3D map of the back of your eye. It allows your doctor to catch the very earliest signs of glaucoma damage, often years before you would notice any vision loss.

Clinical significance

OCT is the gold standard for structural glaucoma evaluation. Monitoring the Retinal Nerve Fiber Layer (RNFL) and Ganglion Cell Complex (GCC) thicknesses provides objective data to confirm disease progression independently of patient input.

How it is tracked

Raw OCT quantitative metrics are parsed directly into the Glaucoma One dashboard via AI OCR, aligning structural thinning side-by-side with functional VFI.