Optician Q&A

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What is optical coherence tomography?


Optical coherence tomography (OCT) is a non-invasive imaging eye test. OCT uses light waves to take cross-section pictures of your retina.


With OCT, your ophthalmologist can see each of the retina’s layers. This allows your ophthalmologist to map them clearly and even measure their thickness. These measurements help with any possible diagnosis. They also provide treatment guidance for glaucoma and other diseases of the retina. 


To prepare you for an OCT exam, your ophthalmologist may put dilating eye drops in your eyes. These drops widen your pupil a little and make it easier to examine the retina.


Scanning your eye takes about 5 – 10 minutes. If your eyes were dilated by the drops, they may also stay a little sensitive to light for several hours after the exam.

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