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Read or Download 2011-2012 Basic and Clinical Science Course, Section 12: Retina and Vitreous (Basic & Clinical Science Course) PDF
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Extra resources for 2011-2012 Basic and Clinical Science Course, Section 12: Retina and Vitreous (Basic & Clinical Science Course)
Tissues with higher reflecti vity, such as the RPE, appear in brighter colors (red-white), and less dense structures, such as the vitreous and intraretinal fl uid, appear in da rker colors (blue-black). OCT is useful for differe ntiating lamellar fro m pseudo- and full-thickness macular holes, diagnOSing vitreomacular traction syndrome, differe ntiating traction-related diabetic 28 • Retina and Vit re ous A Figure 2-3 Optical coherence tomography. A, Normal subject. OCT scan showing normal foveal depression and retinal thickness.
1995; 1:3-7) 24 • Retina and Vitreous and is not visible. As fluorescein leaks into the space, the margins of the space trap the fluorescein and appear distinct, as seen, for example, in an RPE detachment in central serous chorioretinopathy (Fig 2-2D). As more flu orescein enters the space, the entire area fluoresces. A tra nsmission defect, or window defect, refers to a view of the normal choroidal fluo rescence through a defect in the pigment or loss of pigment in the RPE, such as shown in Figures 2-1A and 2·1 B.
Most electrophysiologic tests are evoked responses. A representation of the sequence of events along the visual pathway, from changes in the retinal pigment epithelium (RPE) to cortical potentials of the occipital lobes, can be made by adjustin g stimu lus co ndit ions and techniques of record ing. However, because an ab normality at a proximal source usually gives an abnormal signal fa rther along the vis ual path way, tes t results can be misleading if inte rpreted in isolation from the cl inical findin gs or tests specific to other areas of th e visual pat hway.