An OCT, an optical coherence tomography, is an exam that uses an infrared laser to take high-quality images at incredible speed. OCT, therefore, allows early detection of eye pathologies.
There are many indications for OCT:
- At the retina level: it highlights the slightest anomalies in the fundus and allows you to see in-depth. The term tomography corresponds to this sectional view of the tissues of the fundus. Therefore, it is essential for the diagnosis and monitoring of AMD (age-related macular degeneration), vascular occlusions, diabetic retinopathies, and any abnormalities that disturb vision.
- At the optic nerve level: it is mainly used for monitoring glaucoma because it allows the thickness of nerve fibres to be measured. It, therefore, effectively complements the ophthalmological examination and that of the visual field.
- At the level of the cornea: it measures the thickness of the cornea to detect any thinning or thickening. It also checks its topography to detect the slightest anomaly.
How does an exam work with OCT?
For the patient, OCT is a simple, quick and painless examination. It does not require the instillation of drops. Unless your optometrist deems it necessary to do a fundus examination, drops to dilate your pupils will be instilled. You will be seated at the camera, your forehead and chin against a support, and you will stare at a point of light in the camera while the latter takes many pictures. The examination lasts between 30 seconds and two minutes and must be performed on both eyes to compare them.
Are there any risks?
OCT is completely safe, harmless, and painless.
Can I drive after an eye scan?
You will be able to drive without problem after an OCT unless your optometrist has dilated your pupils to do a fundus exam. In this case, it is recommended to wait for 2 to 4 hours before getting back behind the wheel.
What does this test show?
The OCT shows the state of the retina, the optic nerve and the cornea, depending on the pathologies sought.