الفهرس 
Anatomy and Physiology of MaculaOnly 14 pages are availabe for public view
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Abstract
Cystoid macular edema (CME) represents a common pathologic sequel of the retina and occurs in a variety of pathological conditions such as intraocular inflammation, central or branch retinal vein occlusion, diabetic retinopathy and most commonly following cataract extraction. Histological studies show that radially orientated cystoid spaces consisting of ophthalmoscopically clear fluid are often clinically detectable in the macular area. These cysts seem to be areas of retina in which the cells have been displaced.
The two most common imaging modalities utilized to detect CME due to various etiologies include fluorescein angiography (FA) and optical coherence tomography (OCT).
OCTA is a functional extension of structural OCT which performs repeated B-scans to detect motion contrast and visualize vasculature. Stationary objects won’t produce much of a change from one image to the next, while moving objects will. By looking for change over time, an image can be created that highlights movement. Since the only expected motion in the retina is blood flow in vessels, the net expected result is to visualize blood flow. As with any simplification to actual practice, implementation decisions have to be made which can lead to differences in function and performance. These implementation decisions include how flow is detected, what defines a difference between B-scans, how bulk eye motion not caused by blood flow is managed, and how results are displayed. Each of these in turn prompts a series of hardware and software decisions, each having some type of tradeoff in terms of performance, potential problems, or cost.
We aimed by this study to evaluate the role of optical coherence tomography angiography in the diagnosis of cystoid macular edema and we applied this study on thirty eyes which was divided into two equal groups: CME group (n=15 eyes) and Control group (n=15 eyes), with the same inclusion and exclusion criteria.
This study was applied on thirty eyes will be divided into two equal groups: CME group (n=15 eyes) and Control group (n=15 eyes), with the same inclusion and exclusion criteria. This study included thirty eyes of twenty four patients.