Results 21 to 30 of about 570,903 (309)

Long-term visual and microperimetry outcomes following autologous retinal pigment epithelium choroid graft for neovascular age-related macular degeneration [PDF]

open access: yes, 2009
To describe the 2- to 4-year visual and microperimetry outcomes of autologous retinal pigment epithelium (RPE)-choroid graft in patients with neovascular age-related macular degeneration (AMD).In this retrospective cohort study, 12 patients with ...
Coffey, PJ   +17 more
core   +1 more source

Retinal arterioles narrow with increasing duration of anti-retroviral therapy in HIV infection: a novel estimator of vascular risk in HIV? [PDF]

open access: yes, 2012
OBJECTIVES: HIV infection is associated with an increased risk of age-related morbidity mediated by immune dysfunction, atherosclerosis and inflammation.
Pathai, Sophia   +37 more
core   +1 more source

Interactive Blood Vessel Segmentation from Retinal Fundus Image Based on Canny Edge Detector

open access: yesSensors, 2021
Optometrists, ophthalmologists, orthoptists, and other trained medical professionals use fundus photography to monitor the progression of certain eye conditions or diseases. Segmentation of the vessel tree is an essential process of retinal analysis.
Alexander Ze Hwan Ooi   +8 more
doaj   +1 more source

Retinal oximetry [PDF]

open access: yesActa Ophthalmologica, 2013
Abstract.Purpose:Malfunction of retinal blood flow or oxygenation is believed to be involved in various diseases. Among them are retinal vessel occlusions, diabetic retinopathy and glaucoma. Reliable, non‐invasive technology for retinal oxygen measurements has been scarce and most of the knowledge on retinal oxygenation comes from animal studies.
openaire   +4 more sources

Uptake and metabolism of retinol (vitamin A) in the isolated perfused rat liver

open access: yesJournal of Lipid Research, 1965
The isolated perfused liver was employed to study various aspects of retinol-C14 metabolism. The rate of uptake of retinol, retinal, retinoic acid, and retinol acetate was rapid (first-order rate constant, k = 0.12–0.16 min−1) during the first 3–10 min ...
Richard D. Zachman, James Allen Olson
doaj   +1 more source

Retinal Fluorescein Leakage in Retinitis Pigmentosa

open access: yesAmerican Journal of Ophthalmology, 1986
Of 82 consecutive patients with retinitis pigmentosa, 78 underwent fluorescein angiography using standard and special, abbreviated photographic protocols. The stereoscopic angiograms disclosed alterations of the blood-retinal barrier, primarily at the level of the retinal pigment epithelium, in 60 patients.
PIERMAROCCHI, STEFANO   +2 more
openaire   +5 more sources

Impaired endothelial function of the retinal vasculature in hypertensive patients [PDF]

open access: yes, 2004
<p><b>Background and Purpose:</b> Arterial hypertension constitutes a central factor in the pathogenesis of stroke. We examined endothelial function of the retinal vasculature as a model of the cerebral circulation.</p> <p ...
Michelson, G.   +5 more
core   +1 more source

Retinal cell transplantation in retinitis pigmentosa

open access: yesTaiwan Journal of Ophthalmology, 2021
Retinitis pigmentosa is the most common hereditary retinal disease. Dietary supplements, neuroprotective agents, cytokines, and lately, prosthetic devices, gene therapy, and optogenetics have been employed to slow down the retinal degeneration or improve light perception.
Tongalp H Tezel, Adam Ruff
openaire   +4 more sources

Non-viral delivery and optimized optogenetic stimulation of retinal ganglion cells led to behavioral restoration of vision [PDF]

open access: yes, 2012
Stimulation of retinal neurons using optogenetics via use of chanelrhodopsin-2 (ChR2) has opened up a new direction for restoration of vision for treatment of retinitis pigmentosa (RP).
Shivaranjani Shivalingaiah   +4 more
core   +1 more source

Noninvasive, In Vivo Assessment of Mouse Retinal Structure Using Optical Coherence Tomography [PDF]

open access: yes, 2009
BACKGROUND: Optical coherence tomography (OCT) is a novel method of retinal in vivo imaging. In this study, we assessed the potential of OCT to yield histology-analogue sections in mouse models of retinal degeneration.
Gesine Huber   +68 more
core   +1 more source

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