Boulder Eye Surgeons
Drs. Donald Keller, Brian Nichols and Bradley Gustave

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.

optical coherence tomography

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.

oct normal anatomy

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 been shown to be clinically useful for imaging and directly visualizing selected macular diseases including macular holes, macular edema, age-related macular degeneration, central serous chorioretinopathy, epiretinal membranes, schisis cavities associated with optic disc pits, and retinal inflammatory diseases.

oct cysts
Analysis of diabetic macular edema reveals thickening of the neurosensory retina with nonreflective cystic spaces visible in the fovea. Macular thickness is quantified; intraretinal or subretinal fluid accumulation can be monitored after treatment.
oct diabetic cystoid macular edema
A macular hole can be detected even when otherwise unseen. Quantitative information aids in staging and in evaluating surgical intervention.
oct macular hole
In age-related macular degeneration, geographic atrophy and other pathologic changes can be directly viewed. Measurements of retinal thickness provide an objective means of monitoring edema and subretinal fluid.