Optical Coherence Tomography
What is OCT ?
Optical Coherence Tomography (OCT) is a diagnostic test that images and
measures retinal thickness. It is used to detect swelling in the
retina or accumulation of fluid as a result of your condition.
OCT testing has become a standard of care for the assessment and
treatment of most retinal conditions. OCT uses rays of light to measure
retinal thickness. No radiation or X-rays are used in this test, and
it is a non invasive procedure. An OCT scan does not hurt and it is not
uncomfortable.
Why is an OCT scan so important?
It is the only way to 'look under the top layer of the retina' and
detect problems early before they affect your vision.
What does the scan involve?
The testing takes only a few minutes. You may need dilating drops so
that your eyes can be properly scanned. You will be seated for the
test, and you may have your face stabilized to ensure no movement during
the test. A special camera is used to take pictures of your inner eye.
The images are transmitted to a computer for the tester to view and
analyse. The results are immediately available, and you will either be
told the results, or they will be sent to your consultant to view
alongside the results of other tests you have had.
Who should have an OCT scan?
You may be given an OCT scan for a variety of reasons, including
monitoring of the progress of your disease, verifying or discounting
suspected swelling of the retina or checking OCT results against other
results to determine the effectiveness of the current medication regime.
Written by patients Rea Mattocks and Annie Folkard and medically checked
and verified by an Orthoptist. Published November 2009.
