Glaucoma is a group of many conditions sharing a final common pathway characterized by accelerated death of retinal ganglion cells and their retinal nerve fiber layer (RNFL) axons resulting in characteristic visual field defects and corresponding optic nerve head anatomical changes. Our review focuses on the Cirrus HD-OCT in diagnosing glaucoma and glaucoma progression.
#Stratus optical coherence tomography software#
Each machine has different glaucoma scan patterns, proprietary software segmentation algorithms, and display outputs. Ultrahigh speed swept source OCT, ultrahigh resolution OCT, polarization sensitive OCT, and adaptive optics OCT are all on the horizon.Ĭurrently, the most common four commercially available SD-OCT devices in the US are: Cirrus HD-OCT (Carl Zeiss Meditec, Dublin, CA, USA), RTVue-100 (Optovue Inc., Fremont, CA, USA), Spectralis OCT (Heidelberg Engineering, Heidelberg, Germany), and Topcon 3D-OCT 2000 (Topcon Corporation, Tokyo, Japan). Only four years later, several companies started to release the next generation technology, spectral-domain OCT (SD-OCT), AKA fourier-domain OCT, which improved upon TD-OCT by capturing more data in less time at a higher axial image resolution, around 5 µm.
OCT became widely popular in 2002 with the release of Stratus OCT, a time-domain technology (TD-OCT) that was well-studied and validated for use in glaucoma and retina and went on to become a standard structural imaging test. Automated software segmentation algorithms are able to outline the retinal nerve fiber layer with much precision, which is relevant in glaucoma since this layer is thinned as ganglion cells are lost. Optical coherence tomography (OCT), first described in 1991, is a noncontact, noninvasive imaging technique that can reveal layers of the retina by looking at the interference patterns of reflected laser light. It will provide a brief review of all modalities, but focus primarily on the Cirrus machine.
This is a review of the utility of spectral-domain optical coherence tomography in the diagnosis and management of glaucoma. 5.6 Correlation of OCT with Visual Field.5.1 Repeatability and Reproducibility of SD-OCT.5 Use of SD-OCT in Detection of Glaucomatous Progression.4 Use of SD-OCT in Diagnosis of Glaucoma.
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