Optical coherence tomography (OCT) is a non-invasive imaging tests. They use light waves to take cross-section pictures of your retina.
With OCT, your ophthalmologist can see each of the retina’s distinctive layers. This allows your ophthalmologist to map and measure their thickness. These measurements help with diagnosis. They also guide treatment for glaucoma as well as retinal disease, like age-related macular degeneration (AMD) and diabetic eye disease.
Optical coherence tomography angiography (OCTA) takes pictures of the blood vessels in and under the retina. OCTA is like fluorescein angiography. But it is a much quicker test and does not use a dye.