Posterior segment OCT is high‑resolution imaging of the retina and optic nerve using optical coherence tomography. It provides micrometre‑level cross‑sections of retinal layers and the nerve head.
Retinal Imaging
Macular scans reveal the thickness and structure of each retinal layer.
- Conditions such as macular degeneration, diabetic macular oedema, macular holes, and epiretinal membranes are readily visualised.
- Fluid, cysts, and subretinal deposits can be detected and quantified.
- Serial scans track response to therapies such as intravitreal injections.
- Widefield protocols allow assessment of more peripheral pathology.
Optic Nerve and RNFL
OCT also images the optic nerve head and surrounding retinal nerve fibre layer.
- RNFL thickness maps assist in diagnosing and monitoring glaucoma.
- Changes associated with optic neuritis, compressive neuropathy, or hereditary optic neuropathies can be documented.
- Quantitative data complement visual field testing and optic disc photographs.
- The non‑contact nature of the test makes it suitable for repeated long‑term monitoring.
