Optical Coherence Tomography

Optical Coherence Tomography, or OCT, is a laser-based, noncontact, noninvasive imaging technique that is capable of obtaining high resolution images of the retina and its components.

OCT is analogous to ultrasound imaging except that light rather than sound waves are used, resulting in a much higher resolution of approximately 10µm in the retina. OCT provides direct, real-time, cross-sectional images of retinal tissue layers, allowing improved resolution and diagnostic capabilities of a variety of eye diseases.

NFL: Nerve Fiber Layer	RPE: Retinal Pigment Epithelium
ILM: Inner Limiting Membrane	CC: Choriocapillaris
GCL: Ganglion Cell Layer	IPL: Inner Plexiform Layer
IS/IOS: Inner & Outer Photoreceptor Segment Junction	OPL: Outer Plexiform Layer

OCT has the capability of measuring the retinal nerve fiber layer thickness in glaucoma, making it possible to detect glaucoma damage at an earlier stage than was previously possible. In addition, objective measurements can be monitored, aiding in better control of disease progression.

Retinal nerve fiber layer analysis can be compared to normative data in addition to data from successive visits to reveal damage and progression from glaucoma.

Macular thickness analysis can also reveal macular complications and provides the ability to track changes over time.

Optic nerve head analysis gives objective cross-sectional information on cupping and neuroretinal rim area.