Results 221 to 230 of about 83,492 (257)
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Retinal Vessels in Down's Syndrome
Archives of Ophthalmology, 1973The fundus vessels of 50 institutionalized mongols were compared with the fundus vessels of 50 sex-matched controls of similar age. Mongols appear to have significantly more retinal vessels crossing the margin of the optic nerve head. The high number of vessels is associated with an unusual, spoke-like appearance of the retinal vasculature and may be ...
E J, Williams +2 more
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Ultrastructure of retinal vessel in retinoblastoma
Experientia, 1970Les vaisseaux de la retine humaine dans la retinoblastoma contiennent les cellules endotheliales, les pericytes, et les membranes de la base. Quelques villosites poussent a la surface endotheliale vers le vaisseau du lumen. Les barres terminales se trouvent pres de la jonction endotheliale.
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Retinal Vessel Classification Technique
2017A retinal vessel classification procedure is proposed. From the image of thinned vessel network, landmarks are extracted and classified as branching, crossover and end points. Then a vascular graph is generated. Using a stratified graph edge labeling procedure the artery/vein map is built.
Florin Rotaru +5 more
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Retinal vessel oxygen saturation and vessel diameter in retinitis pigmentosa at various ages
Graefe's Archive for Clinical and Experimental Ophthalmology, 2015This study was conducted to determine whether oxygen saturation and retinal blood vessel diameter are affected by retinitis pigmentosa (RP) at various ages.Relative oxygen saturation was measured in retinal blood vessels in 68 RP patients and 136 normal subjects using the Oxymap T1 retinal oximeter.
Yao, Zong +8 more
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Objective Measurements of the Retinal Vessels
Annals of Internal Medicine, 1967Excerpt One of the many arts that together make up the "art of medicine" is the ability to base hard decisions on soft data.
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Light paths in retinal vessel oximetry
IEEE Transactions on Biomedical Engineering, 2001The oxygen utilization and, therefore, the metabolic state, of a distinctive area of the retina may be calculated from the diameter of the supplying artery and vein, the haemoglobin oxygenation, and the velocity of the blood. The first two parameters can be determined by imaging spectrometry at the patients ocular fundus.
Martin Hammer +3 more
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The visibility of retinal blood vessels
Vision Research, 1975Abstract The plexus of retinal blood vessels was made visible by moving the shadow across the retina in a controlled manner. Frequency of scanning, amplitude of shadow movement, illuminance, contrast and other parameters were varied while flicker was minimised. Reciprocity between diameter and frequency of scanning (to give a constant speed of shadow
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The architecture of the most peripheral retinal vessels
Albrecht von Graefes Archiv f�r Klinische und Experimentelle Ophthalmologie, 1977The vascular bed of the extreme periphery of the human retina is characterized by the occurrence of relatively wide arcades and bridging vessels connecting the peripheral portions of arteries and veins. These vessels differ from the more posterior capillaries not only by their larger diameter but also by the presence of a perivascular halo, which ...
M, Spitznas, N, Bornfeld
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The entoptic view of the retinal vessels
Acta Ophthalmologica, 2013Abstract.The first time the retinal vessels were seen in man in vivo was reported in 1819 by Purkinje as an entoptic view. This was understood to show the shadow of the vessels, an interpretation objected to in 1834 by Brewster. Müller in 1855 (Über die entoptische wahrnehmung der netzhautgefässe, insbesondere als beweismittel für die lichtperception ...
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