Document Detail


Zero delay switch technique in optical coherence tomography for duo enhanced vitreoretinal and choroidoscleral imaging in highly myopic eyes.
MedLine Citation:
PMID:  23331376     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Posterior staphyloma is a concave depression of the posterior shell of the eye globe that is frequently observed in highly myopic eyes. As hallmark lesion, it is seen in 90% of patients with high myopia and increases in prevalence with age.1 Highly myopic eyes with posterior staphylomata have a higher probability of visual disturbances; the stretching of the posterior fundus results in various lesions such as chorioretinal atrophy, choroidal neovascularization, lacquer cracks, foveoschisis, macular holes and serous macular detachments. 2 It has been observed that with age, posterior staphylomata tend to deepen and their morphological characteristics can change accompanied by an increased risk of complications. Optical coherence tomography (OCT) is a valuable non-invasive tool in the monitoring and evaluation of these patients by providing detailed cross-sectional structural information of vitreo-retinal structures. Spectral domain OCT (SD-OCT) encodes depth information as different frequencies of the interference spectrum. With increasing depth, the interferometric signals have higher frequencies and occur further from the point of detection or the "zero-delay line", resulting in a decrease in resolution and signal strength. With zero delay normally located at the top portion of the OCT viewing screen, vitreoretinal structures can be visualised with optimal definition. Recently, Spaide described a technique where by advancing the camera closer to the eye so that the image became inverted, the choroidoscleral portion of the image was placed closer to the zero delay. This technique, also called enhanced-depth imaging (EDI) has now been incorporated into the OCT acquisition software so that the zero delay can be set to the bottom of the viewing screen to enhance definition of the deeper structures.(3).
Authors:
Mei H Tan; Fred K Chen
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Publication Detail:
Type:  LETTER     Date:  2013-1-21
Journal Detail:
Title:  Clinical & experimental ophthalmology     Volume:  -     ISSN:  1442-9071     ISO Abbreviation:  Clin. Experiment. Ophthalmol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100896531     Medline TA:  Clin Experiment Ophthalmol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 The Authors. Clinical and Experimental Ophthalmology © 2013 Royal Australian and New Zealand College of Ophthalmologists.
Affiliation:
Centre for Ophthalmology and Visual Science, The University of Western Australia, Perth, Western Australia, Australia; Department of Ophthalmology, Royal Perth Hospital, Perth, Western Australia, Australia.
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