Optical Coherence Tomography (OCT)

What is OCT and Why is it Done?

OCT (Optical Coherence Tomography) is a non-invasive diagnostic imaging test that uses light waves to capture detailed, high-resolution cross-sectional images of the retina and the optic nerve.

It plays a crucial role in the early detection, diagnosis, and monitoring of several vision-threatening eye conditions.

Why OCT is Important:

OCT for Retina Disorders

OCT is a standard procedure for retinal evaluation. It helps detect and manage conditions such as:

OCT scans provide a layer-by-layer view of the retina, helping retina specialists to identify fluid, swelling, or any abnormal tissue.

OCT for Glaucoma

OCT is one of the most advanced tools for the early detection and monitoring of glaucoma, a silent disease that causes damage to the optic nerve.

It is used to:

Regular OCT scans help preserve vision by catching glaucoma in its earliest stages.

While OCT is most commonly used for retina and glaucoma evaluations, it’s also extremely useful in other specialties, including:

Corneal Diseases – to check for keratoconus, dystrophies, or scars
Pre- and Post-Cataract Surgery – to ensure the retina and macula are healthy before surgery, or to explain blurry vision after surgery
Uveitis and Eye Inflammation – to assess internal eye structures and rule out complications
Neuro-Ophthalmology – for optic nerve issues due to stroke, inflammation, or unexplained vision loss

If your ophthalmologist needs a closer look inside your eye, OCT is often the first step.

What to Expect During Your OCT Test

No injections, no touching the eye, and no discomfort
You’ll sit at a machine and rest your chin for a few minutes
A scanning light moves across your eye (you may see a flash)
The entire process takes 5–10 minutes per eye
Results are ready immediately and explained by your doctor

In some cases, your pupils may need to be dilated for a clearer image.

Duration

The duration of the OCT (Optical Coherence Tomography) test will be 5 – 10 minutes.

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