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OCT: The 'MRI' of the Retina Explained

Medically reviewed by Dr. Shantanu Kumar GuptaLast updated 15 Feb 2026· 5 min read
OCT: The 'MRI' of the Retina Explained

Overview

OCT is a non-contact scan that uses harmless light waves to produce a cross-section of the retina at 5-micron resolution. It is the single most powerful tool in medical retina practice.

Diagnosis

OCT is performed in under 5 minutes without dye or pain. Dilation is preferred for a wider view.

Treatment options

N/A — OCT is diagnostic.

When to see a doctor

OCT is recommended whenever the doctor suspects macular disease, glaucoma or optic-nerve pathology.

Frequently Asked

References

  • ISOPT OCT Consensus 2023
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Medical disclaimer

This article is for patient education. It is not a substitute for personalised medical advice, examination or diagnosis. If you have symptoms discussed here, please book an in-person consultation with a qualified ophthalmologist.

Dr. Shantanu Kumar Gupta
Written & medically reviewed by
Dr. Shantanu Kumar Gupta
MBBS, MS, DNB, FICO (Merit)

Consultant Ophthalmologist at Shantanu Netralaya Eye Hospital, Varanasi. New Delhi (MAMC / Guru Nanak Eye Centre) trained cataract, cornea and medical retina specialist. FICO (Merit).