Optical Coherence Tomography (OCT) is a non-invasive imaging technology that uses light waves to capture high-resolution cross-sectional images of the retina and optic nerve. It is an essential tool in diagnosing and monitoring glaucoma.
How Does OCT Work?
OCT uses near-infrared light to create detailed cross-sectional images of the retinal layers, similar to how ultrasound uses sound waves. The scan is quick, painless, and non-contact — it takes only a few seconds per eye. The technology can measure the thickness of the retinal nerve fiber layer (RNFL) and the ganglion cell layer with micrometer precision.
What Does OCT Detect?
In glaucoma care, OCT is used to measure the thickness of the retinal nerve fiber layer around the optic nerve head and the ganglion cell-inner plexiform layer in the macula. Thinning of these layers indicates damage from glaucoma, often before any vision loss is noticed by the patient. OCT can detect structural damage years before functional changes appear on visual field tests.
OCT in Glaucoma Monitoring
Serial OCT scans taken over time allow your doctor to track disease progression precisely. Modern OCT software includes progression analysis tools that can detect small changes in nerve fiber thickness, helping to determine if treatment is effectively controlling the disease. Prof. Leshno uses the latest OCT technology to provide the most accurate and detailed imaging available.
What to Expect During the Test
The OCT exam is quick and comfortable. You will sit in front of the machine and look at a target light while the scan is performed. No drops or contact with the eye is required for most OCT scans. The entire process takes about 5–10 minutes for both eyes. Results are available immediately and will be reviewed with you during your appointment.