Optical coherence tomography (OCT) allows your optician to identify subtle changes over time, such as changes in the vitreous (the jelly-like substance that fills the eye), the retina and the macula.

Working in a similar way to ultrasound, but using light waves instead of sound waves, OCT allows your optometrist to view the distinct layers of the retina.

By mapping and measuring the thickness of the retina’s layers, an OCT scan can detect the early signs of retinal eye conditions and diseases, earlier than standard examination techniques. That means it can diagnose eye health problems before you even notice symptoms.

Have you got questions about tests your optician might use?

Call the Macular Society Helpline on 0300 3030 111 or email help@macularsociety.org

Last review date: 02 2022

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