What Is an OCT Eye Scan and Why Does Your Eye Doctor Use It?
Optical coherence tomography, or OCT, is a scan that shows the layers of your retina and optic nerve in cross-section. If a retinal photo is like looking at the surface of a lake, an OCT scan is like seeing a slice of the water from top to bottom. At Uptown Eye Boutique in Johns Creek, Dr. Brian Schultz uses OCT to find and track eye disease earlier than a standard exam can alone.
How an OCT scan works
OCT uses light waves to measure the thickness and structure of tissue at the back of the eye. The scan builds a detailed image of each retinal layer and measures the nerve fibers around the optic nerve. Nothing touches your eye, there is no radiation, and each scan takes only a few seconds.
What OCT can detect
Because OCT measures layers that can't be seen with a regular exam, it is especially helpful for conditions that change slowly and quietly:
Glaucoma: OCT measures the nerve fiber layer around the optic nerve, which can thin before you notice any change in vision
Macular degeneration: OCT can show fluid, swelling or thinning in the macula
Diabetic eye disease: OCT can detect swelling in the macula caused by leaking blood vessels
Macular holes and membranes: small tears or scar-like layers on the retina show up clearly
Changes over time: repeat scans can be compared to show whether a condition is stable or progressing
Why early detection matters
Many of these conditions cause no pain and no early symptoms. Glaucoma in particular usually affects side vision first, so people often don't notice anything until damage is advanced, and that damage can't be reversed. OCT lets Dr. Schultz see changes at the earliest stage, when treatment or closer monitoring can protect your sight.
What to expect during the scan
You sit at the machine, rest your chin and forehead, and look at a target light. The scan is quick and painless. Dr. Schultz reviews the results with you, often comparing them against your previous scans and a reference range for people your age.
OCT as part of a complete exam
OCT is one piece of a thorough eye health evaluation. It pairs naturally with retinal imaging, a visual field test and an eye pressure check. If you have risk factors for glaucoma, our glaucoma testing in Johns Creek brings these tests together. For a full overview of what's checked, see our comprehensive eye exams.
Frequently asked questions
Who should have an OCT scan?
OCT is especially helpful for people with a family history of glaucoma, diabetes, high myopia, macular degeneration or a suspicious finding on another test. Dr. Schultz will recommend it when it adds useful information.
Does an OCT scan hurt?
No. It is a non-contact scan that takes a few seconds per eye.
Do I need to be dilated for OCT?
Many OCT scans can be done without dilation, though dilation is sometimes recommended for the rest of the exam.
Is OCT covered by insurance?
When OCT is needed to diagnose or monitor a medical condition, it is often billed to medical insurance rather than a vision plan. Our team can help you understand your coverage; see the insurance plans we accept.
Uptown Eye Boutique is open Monday through Saturday in Johns Creek, GA. Comprehensive eye exams are provided by Dr. Brian Schultz, OD.
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