About this procedure
OCT may be requested for changes in central vision, suspected macular problems or follow-up of certain optic nerve disorders. Different scan protocols focus on the macula, optic nerve or retinal nerve-fibre layer. A test ordered for one structure should not automatically be treated as an assessment of every eye problem.
Clinical features
The technique uses reflected light rather than X-rays and is usually performed without touching the eye. Depending on the clinical question, the pupil may or may not need to be dilated. Patients are asked to look at a target while the device captures the image.
Important differences and warning signs
OCT shows anatomy at a particular moment. The clinician compares the result with symptoms, ocular pressure, examination findings and, when available, previous images. An OCT scan does not replace clinical examination; an isolated colour-coded printout should not be interpreted as a diagnosis without checking image quality and clinical context.
Assessment and individual care
Bring earlier OCT reports and images if available. A clinician determines whether repeat scanning or another investigation will help. The clinic may have different pricing for different scan regions or protocols; verify the specific test and price rather than assuming a single universal OCT fee.
Related information: Glaucoma; Retina and macula.
Signs and symptoms
- Changed central vision, distorted lines or a suspected macular disorder.
- Need to assess the optic nerve or nerve-fibre layer in a glaucoma work-up.
- Monitoring of a previously established eye condition when clinically indicated.
Diagnosis and tests
The operator obtains cross-sectional images while the patient fixes on a target; the ophthalmologist interprets them with the rest of the examination.
Care and treatment approaches
OCT is a diagnostic test, not treatment. Follow-up intervals and additional procedures depend on the physician's assessment and the particular scan type.
When to seek urgent care
Sudden loss of vision, new numerous floaters, flashes with a dark curtain or severe eye pain requires immediate assessment; do not wait for a booked OCT scan. Call 103 for sudden major vision loss or serious injury.
Frequently asked questions
Does the OCT scanner touch the eye?
Usually no. It records optical images without physical contact with the surface of the eye.
Is one OCT price valid for every eye scan?
Not necessarily. Scan locations and examination protocols differ, so the scope and current fee should be confirmed when booking.
Can an OCT image alone diagnose glaucoma?
No. Optic nerve scans need to be considered with examination, eye pressure and functional visual-field results.
Information sources
Medical source links used when preparing this article.
Important information
A medical consultation is needed for diagnosis and treatment recommendations.
Self-treatment can be harmful to your health.
