Diagnostics·Diagnostics
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Optical coherence tomography (OCT) is a quick, painless eye scan that uses light waves to take detailed cross-section pictures of your retina — the light-sensitive layer at the back of your eye. It helps your eye doctor see the layers of your retina clearly, almost like a 'CAT scan' for your eye.
Key facts
Yes, OCT is a very common test used in eye clinics and hospitals worldwide. Many people have it as part of a routine eye exam or to monitor an eye condition.
Anyone can have an OCT scan. It is often recommended for people with eye symptoms, those at risk of certain eye diseases, and older adults who are more likely to develop age-related eye problems.
Your eye doctor will perform a comprehensive eye exam. If they suspect a retinal or optic nerve problem, they will likely recommend an OCT scan. The scan is done in the clinic using a machine that looks like a large camera.
You will sit in front of the OCT machine and rest your chin and forehead on supports. The technician will ask you to look at a target light while the machine scans your eye. You may see a bright light, but it should not hurt. The whole process takes about 5–10 minutes. Afterward, if you had dilating drops, your vision may be blurry for a few hours.
An OCT scan itself does not require treatment. It helps your doctor diagnose eye conditions. The treatment will depend on what the scan shows. Your doctor will discuss the results with you and recommend the best next steps.
If an eye condition is found, treatment may include prescription eye drops, laser therapy, injections into the eye, or oral medications. Your doctor will explain which approach is best for your specific situation. Always follow your doctor's instructions carefully.
If you have an eye condition detected by OCT, you may need to adapt your daily activities. Use good lighting, magnifiers for reading, and arrange your home to avoid tripping hazards. Most people continue with their normal routines with minor adjustments.
A diet rich in leafy green vegetables, colourful fruits, and fish high in omega-3 fatty acids may support eye health. Regular exercise helps control weight, blood pressure, and diabetes — all of which affect your eyes.
You cannot always prevent eye diseases, but early detection through regular eye exams — including OCT scans when recommended — gives you the best chance to preserve your vision. Managing overall health and protecting your eyes also help.
Routine eye exams are the best screening tool. Your doctor will let you know how often you need an OCT scan based on your age, risk factors, and any eye symptoms.
The outlook is generally good when eye conditions are caught early. Many people maintain useful vision for many years. OCT scans help doctors spot problems at an early stage, which often means simpler and more effective treatment.
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Always verify with your doctor
Health guidelines vary by country and region. The information in this article is based on international clinical guidelines but may not reflect the specific guidelines, medications, or practices in your country. Always discuss your health concerns with your own doctor or healthcare provider, and refer to your local national health guidelines where available.
Important notice This information is for educational purposes only. It does not replace professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. If you are experiencing a medical emergency, call your local emergency services immediately.
This article is educational and is prepared with reference to recognized health information and clinical guidance sources where available. Specific source links may vary by topic.
Last updated: July 9, 2026
Educational note: This information is for education only and is not a diagnosis.
Use it to support, not replace, advice from a licensed clinician.
If symptoms are severe, worsening, or urgent, call your local emergency number or seek emergency care.
For some conditions, such as a detached retina or advanced glaucoma, surgery may be needed. Your eye doctor will refer you to a specialist if surgery is an option.
Finding out you have an eye condition can be worrying. It is normal to feel anxious or sad. Talk to your doctor about your concerns. Many eye conditions can be managed, and support is available. If you feel overwhelmed, consider speaking with a counsellor.