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Optical coherence tomography (OCT) is an imaging technique that uses interferometry with short-coherence-length light to obtain micrometer-level depth resolution and uses transverse scanning of the light beam to form two- and three-dimensional images from light reflected from within biological tissue or other scattering media.
Optical coherence tomography angiography (OCTA) [1] [2] [3] ... OCTA has applications in several diseases, including leading causes of blindness such as glaucoma ...
Glaucoma is a group of eye diseases that ... anterior chamber angle assessment by optical coherence tomography, ... Results from a meta-analysis of 33,428 primary ...
The Heidelberg Retinal Tomography is a diagnostic procedure used in ophthalmology.The Heidelberg Retina Tomograph (HRT) is an ophthalmological confocal point scanning laser ophthalmoscope [1] for examining the cornea and certain areas of the retina using different diagnostic modules (HRT retina, HRT cornea, HRT glaucoma).
Used for macula, retinal and neuro-ophthalmic conditions and advanced glaucoma [4] 24-2: Measures 24 degrees temporally and 30 degrees nasally and tests 54 points. Used for neuro-ophthalmic conditions and general screening [5] as well as early detection of glaucoma [6] [7] 30-2: Measures 30 degrees temporally and nasally and tests 76 points.
A comprehensive database is essential for accurate glaucoma detection. In this instrument a database from 540 normal eyes is used. The subjects are multi-ethnic and 18–82 years old. The database also contains 262 glaucomatous eyes used by the NFI to discriminate between normal and glaucoma.
Scanning laser ophthalmoscopy developed as a method to view a distinct layer of the living eye at the microscopic level. The use of confocal methods to diminish extra light by focusing detected light through a small pinhole made possible the imaging of individual layers of the retina with greater distinction than ever before. [4]
The RNFL formed by the expansion of the fibers of the optic nerve; it is thickest near the optic disc, gradually diminishing toward the ora serrata.. As the nerve fibers pass through the lamina cribrosa sclerae they lose their medullary sheaths and are continued onward through the choroid and retina as simple axis-cylinders.
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