OCT: Optical Coherence Tomography

An OCT scan is an extremely detailed scan of the front or back surface of the eye.  It produces a 2D or 3D image of various structures such as the macula, optic nerve and anterior chamber.  It can be used to detect conditions such as macular degeneration and nerve changes (e.g., glaucoma).

What is an OCT and how does it work? 

An OCT, or optical coherence tomography, is an extremely advanced and detailed scan of the front or back surface of the eye.  Similar to an ultrasound (which uses sound waves), an OCT uses light waves which are reflected from either the front or back surface of the eye. This in turn creates a highly detailed 2D or 3D image of various internal structures.

What does an OCT show?  The OCT machine not only photographs an area of the retina, but it also creates a cross-section of the structures and various layers which are not visible to the eye.  Unlike a photograph, which only shows superficial pathology, the OCT scan allows for early and easier detection of conditions such as macular degeneration or nerve changes found in glaucoma.  These images are digitally stored and can be viewed alongside each other in a timeline manner to detect even the most subtle changes.  

How is the scan taken? Having an OCT scan is a quick and easy process.  Nothing comes into contact with the eye and it is completely pain-free. You will be asked to look at a target and the scan will be taken in seconds, much like taking a photograph.

Who can have the scan?  This scan is available to and advised for all ages, including children. 

The cost of this scan is £20 and allows for unlimited types of OCT scans performed within the same appointment.