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Home Patients' Zone Patient Leaflets OCT Eye Scan

OCT Eye Scan

A quick, painless scan of the retina and optic nerve

Optical coherence tomography (OCT) uses harmless light to take detailed cross-section pictures of the retina, a little like an ultrasound but with light. It can show layers just a few thousandths of a millimetre thick, and it takes only a few seconds per eye.

What OCT is used for

  • Macula: fluid in wet AMD and diabetic macular oedema, macular holes, epiretinal membranes, central serous chorioretinopathy.
  • Glaucoma: measuring the nerve fibre layer and optic disc to detect damage early and track change.
  • Monitoring treatment: deciding when injections are needed, and checking for side effects of medicines such as hydroxychloroquine.
  • OCT angiography: showing blood flow without dye. See OCT angiography.

What to expect

  1. You sit at the machine with your chin on a rest and look at a target light.
  2. The scan takes a few seconds per eye. Nothing touches the eye.
  3. Dilating drops are sometimes used for a clearer picture.
  4. The doctor explains the images with you, often at the same visit.

Tips for a good scan

  • Blink just before each scan and then keep the eye still.
  • Tell the technician if your eyes are dry; a lubricant drop can help.
  • Bring previous scan reports so changes can be compared.

Frequently asked questions

Is an OCT scan safe?

Yes. It uses low-power light, no radiation, and nothing touches the eye.

How long does an OCT scan take?

A few minutes for both eyes, including positioning.

Do I need dilating drops for OCT?

Not always. Small pupils or cataract may need dilation for a clear image.

How often do I need OCT?

It depends on the condition: monthly during injection treatment, every 6 to 12 months in glaucoma.

Related: OCT Angiography for Early Diabetic Retinopathy, Glaucoma Clinic in Ahmedabad: Tests, Drops & Laser, Retina Treatment in Ahmedabad.

This leaflet gives general information and does not replace advice from your own eye doctor. Reviewed by Dr. Dhaval Patel, MD (Ophthalmology, AIIMS New Delhi), November 2026.

Questions about this?

Sadbhaav Eye & Dental Clinic, Motera, Ahmedabad. Dr. Dhaval Patel, MD (AIIMS New Delhi). Monday to Saturday, 10 am to 1 pm and 5 pm to 8 pm. For a serious eye injury outside clinic hours, go to the nearest eye hospital or emergency department.

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