الفهرس 
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Abstract
SD-OCT is a high-speed, high resolution imaging modality for the retina, choroid, optic nerve, and anterior segment structures. With it, we can now image both anterior segment and posterior segment with one machine. It provides quantitative data which include measurements of the thicknesses of the retinal layers, and cornea also it provides topographic parameters of the retina, optic nerve head and optic disc. It also allows imaging of retinal and choroidal blood flow similar to Doppler ultrasound.
It has many advantages over the TD-OCT system, which include the ability of imaging through non dilated pupils, higher image quality due to the increased speed of image acquisition that minimize motion artifacts, and increased number of scans, improve the sensitivity and show small lesions that may be missed by the six radial scans of the TD-OCT system. The ability to perform three-dimensional imaging is an added advantage with image segmentation, tracking, and registration of OCT images with real fundus images.
It allows video imaging, by which we can analyze the scans without the patient’s presence. Follow up can also be done by the automated system protocol which allows comparison between the new and the previous scans.
It is important to note that SD-OCT measurements are based on different algorisms than those taken by the TD-OCT, hence cannot be used interchangeably for comparison or follow up.
SD-OCT enables clinical assessment of photoreceptor integrity which is of great help in understanding pathogenesis, follows up and detecting prognosis of many retinal diseases.
It is now a valuable tool in the early detection of glaucoma due to the quantitative, and reproducible images of the ONH and RNFL it provides, along with the added ability to detect ganglion cell complex losses.
Anterior segment SD-OCT proved to be important in the management of patients undergoing corneal refractive surgery, various corneal diseases and in closed angle glaucoma.
A Handheld version of SD-OCT has been recently developed for pediatric and intraoperative imaging in retinal, glaucoma and corneal surgeries. Also recently SD-OCT can be integrated onto the slit lamp which will facilitate examination.
Although SD-OCT may have many advantages but it has also some limitations to be resolved with further researches.