The OCT scanner

What is OCT?

Ocular Coherence Tomography (OCT) is a non-invasive imaging test that uses light waves to take cross-section pictures of your retina. Our scanner takes 128 individual scans of the back of the eye that shows the structure of the back of the eye in incredibly fine detail.

scan from OCT

What Happens During the OCT?

When you are taken through for your pre-screening you will be seated in front of the OCT and rest your head on a support. One of our optical assistants will talk you through each scan, and where to look. There is usually a green square on the screen to focus on, which can be in different positions for each scan. The machine will scan your eye and there will be a bright flash of light. Each scan will be viewed by the optometrist and discussed with you in your consultation.

optometrist and patient looking at OCT results

Why We Include OCT In Our Eye Examinations

Whilst fundus photography takes images of the back of the eye, these do not show the finer details that the OCT can. We include the OCT scans in our eye examinations as they allow the optometrist to see each of the distinctive layers of the retina, mapping and measuring their thickness. The OCT can help to diagnose many eye conditions including:

  • Macular hole
  • Macular pucker
  • Macular oedema
  • Age-related macular degeneration
  • Glaucoma
  • Diabetic reinopathy

Each time you have an eye examination including OCT the optometrist will compare it to your previous visit to ensure there have been no changes, or to monitor an ongoing condition.