O.C.T. stands for Optical Coherence Tomography, and also goes by the name "SCODI", which stands for Scanning Computerized Ophthalmic Diagnostic Imaging. O.C.T. allows us to see structures inside the eye as if they were cross-sectioned and under a microscope.

There are basically three things we can look at using this technology.
*Click on the thumbnails to view larger image.

Anterior Segment

The first picture is an OCT of the "anterior segment". We see the cornea, the iris (the color of the eye), and the pupil. The angle formed by the cornea and the iris is important because that's where the fluid circulating in the eye makes it's exit. If that angle becomes too narrow, fluid can't get out and the pressure builds. This is one form of glaucoma and can be devastating. Fortunately, this is treatable.

Early Macula Degeneration

The second picture here is an OCT of the macula; the part of the retina where your 20/20 vision comes from. It has the highest concentration of "cones" which are the receptors for the best acuity and also for color vision.
Shown in this picture is early Macula Degeneration.

Topographical Map

The third OCT is a topographical map showing the thickness of the nerve fiber layer in the retina. More specifically, this third image is a map of the fiber layer in the area surrounding the optic nerve head - which is where the optic nerve exits the eye.
This particular image is taken from a patient with glaucoma, which can cause thinning of the retinal nerve fiber layer in that area. This is important because sometimes people can have glaucoma even with normal, or even low eye pressure.
Conversely, you can have high eye pressures and not have glaucoma. This is one of several tests which can help make the distinction.

To see a demonstration of OCT, see this video from Good Morning America

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