Eye exams play a major role in maintaining eye health. Not only do they indicate whether you need glasses or a prescription change, but they also help detect eye conditions that can affect your vision. Optometrists use optical coherence tomography (OCT) to see the health of your eyes. OCT takes pictures to create a 3D scan of the back of your eye to help detect conditions such as diabetes, glaucoma and the earliest stages of age-related macular degeneration. At Specsavers, we include OCT scans with every standard eye exam.