![]() The choriocapillaris and choroid are highly reflective layers, because they are vascular and limit light penetration into the deeper layers. The posterior hyaloid usually is indistinguishable from the retinal surface except when the posterior vitreous is detached and appears as a weakly reflective band. The vitreous transmits light without reflecting it and is depicted in black in OCT images (Figure 1). Therefore, the image is not real but represents the true dimensions of the measured structures ( 1-10) It should be noted that the color shown in the images represents the optical properties of the tissues and not the tissues themselves. Tissues that moderately reflect light are shown as green or yellow. More concisely, tissues that reflect more light or disperse more light are shown in red and white, respectively, while the ones that reflect or disperse less light are shown in blue and black. The images are presented in a color (or gray) scale based on the different reflectivity of the tissue structures. These capabilities facilitate an understanding of the differences between the classic membranes, occult membranes, retinal angiomatous proliferation (RAP) and disciform scars in the natural course of the disease and assess the response to anti-vascular endothelial growth factor (VEGF) drugs. OCT provides important information on serous retinal detachments, hemorrhages and subretinal neovascular membranes that are components of exudative macular degeneration and allows a more precise and detailed analysis of anatomic structures and neovascular membrane lesions subtypes. ![]() These capabilities allow detection of newly emerging fluid and/or intraretinal or subretinal tissue and tissue below the retinal pigment epitheliumĬ. It permits to define the location and nature of the changes in the retina and adjacent structures and objectively evaluates the thickness of the retina and surrounding structures. Optical coherence tomography (OCT) technology allows the acquisition of cross-sectional images of the retina with semihistologic resolution. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |