نتایج جستجو برای: retinal vessel occlusion
تعداد نتایج: 204184 فیلتر نتایج به سال:
Human retina consists of repeating pattern of arteries and veins. This repeating pattern is known as Fractals. Fractal Dimension is the quantity which is to be determined for analyzing disorder in retina using fractal analysis. There are two disorders of retina which leads to complete vision loss. They are Occlusion and Diabetic Retinopathy. Occlusion is due to arteries crossing over vein leadi...
This paper presents an automatic application that provides several retinal image analysis functionalities, namely vessel segmentation, vessel width estimation, artery/vein classification and optic disc segmentation. A pipeline of these methods allows the computation of important vessel related indexes, namely the Central Retinal Arteriolar Equivalent (CRAE), Central Retinal Venular Equivalent (...
Retinal blood flow quantification by retinal vessel segmentation with Doppler optical coherence angiography is presented. Vessel diameter, orientation, and position are determined in an en face vessel image and two representative cross-sectional flow images of the vessel. Absolute blood flow velocity is calculated with the help of the measured Doppler frequency shift and determined vessel angle...
A 31‐year‐old healthy man presented with sudden onset visual field defect in his left eye for 2 days. The best‐corrected visual acuity (BCVA) was 20/20 in the right eye and 20/40 in the left eye. Fundus examination of the left eye revealed a superior hemi‐central retinal artery occlusion [Figure 1a], sparing the fovea with a white embolus at the arterial bifurcation on the optic nerve head. The...
Increasing evidence from neuro and retinal imaging, neuropathology, epidemiology and experimental models suggests that the primary underlying initiating cause of cerebral small vessel disease is the derangement of the blood-brain barrier. This may start some years before the first symptoms, leads to the small vessel structural changes (vessel wall thickening, disorganisation and eventual breakd...
Acute monocular visual loss is an alarming symptom for the patient and the emergency physician. This article focuses on the presentation, diagnosis, and management of several causes of acute monocular visual loss with suggestions for when to emergently involve an ophthalmologist. Topics discussed include temporal arteritis, optic neuritis, retinal artery occlusion, retinal vein occlusion, retin...
BACKGROUND/AIMS A moderately elevated plasma concentration of the sulphur amino acid homocysteine is an independent risk factor for atherosclerotic vascular disease. Many of the risk factors associated with coronary, cerebral, and peripheral atherosclerotic vascular disease are common to retinal vascular occlusive disease but it is unclear whether elevated plasma concentrations of homocysteine ...
A 59-year-old woman with history of noninsulin dependent diabetes mellitus and systemic hypertension presented with decreased vision in her left eye since 2 months ago. Bestcorrected visual acuity (BCVA) was 20/20 and 20/400 in the right and left eyes respectively. Relative afferent pupillary defect was negative. Anterior segment examination was unremarkable except for mild posterior subcapsula...
Dear Editor, Retinal artery occlusion (RAO) is characterized by attenuated arterioles and ischemic retinal opacity, which suggest retinal infarction. Branch RAO (BRAO) has a more favorable prognosis than central RAO (CRAO). CRAO and BRAO can be differentiated based on the isch-emic retinal opacity area, location of the attenuated vessels , and a cherry-red spot [1]. However, we encountered a ca...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید