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Optical coherence tomography

This camera optically produces an image showing a ‘slice’ of the retina, with the various layers having different colours. It is useful for detecting abnormal fluid at the back of the eye.

 

Fig4-4a    Fig4-4b

The OCT scan on your left shows a normal retina and that on your right shows macular oedema, with cystic fluid-filled spaces distorting the retinal structure and causing blurred vision.