نتایج جستجو برای: abnormal retinal vessels

تعداد نتایج: 256742  

2016
Min-Kyung Kang Sin-Hye Park Yun-Ho Kim Eun-Jung Lee Lucia Dwi Antika Dong Yeon Kim Yean-Jung Choi Young-Hee Kang

Diabetic retinopathy (DR) develops in a significant proportion of patients with chronic diabetes, characterized by retinal macular edema and abnormal retinal vessel outgrowth leading to vision loss. Chrysin, a naturally-occurring flavonoid found in herb and honeycomb, has anti-inflammatory, antioxidant, and anti-cancer properties. This study sought to determine the protective effects of chrysin...

Journal: :Indian Journal of Ophthalmology 2019

2012
Jaspreet Kaur

Jaspreet Kaur, Dr. H.P.Sinha 1 Student, ECE, MMU, mullana University , Haryana, India, [email protected] 2 Associate Professor, ECE, MMU, mullana University , Haryana, India, [email protected] Abstract Ocular fundus image can provide information on pathological changes caused by local ocular diseases and early signs of certain systemic diseases. Automated analysis and interpretation of fund...

Diabetic retinopathy lesion detection such as exudate in fundus image of retina can lead to early diagnosis of the disease. Retinal image includes dark areas such as main blood vessels and retinal tissue and also bright areas such as optic disk, optical fibers and lesions e.g. exudate. In this paper, a multistage algorithm for the detection of exudate in foreground is proposed. The algorithm se...

Journal: :Circulation 1955
H O SIEKER J B HICKAM J F GIBSON

In hypertension and diabetes retinal vascular changes which are evident on fundiscopic examination are usually accompanied by renal vascular changes which are evident on microscopic examination. It has been found that the retinal vessels of most patients with hypertension or diabetes fail to constrict normally when the blood oxygen tension is elevated. This investigation evaluates the clinical ...

Journal: :Investigative ophthalmology & visual science 1980
R W Bellhorn M S Burns J V Benjamin

Phototoxic retinopathy in rats is characterized by a progressive loss of the outer retinal layers. During the neural degenerative phases, a sequence of vascular change occurs. Whole mounts of ink-injected retinal vessels and flat mounts of trypsin-digested retinal vessels show areas of capillary nonperfusion and acellularity and enlargement of retinal capillaries in the deep bed. When the photo...

2013
Akiko Okubo Munefumi Sameshima Taiji Sakamoto

It has been reported that pulsations in abnormal vessels are observed on indocyanine green (ICG) angiography in half of patients with polypoidal choroidal vasculopathy (PCV), although the mechanism of the pulsation is unknown. In this study, we report a case of PCV showing venous pulsations at an arterio-venous (A-V) crossing, and discuss a possible mechanism of polypoidal vessel formation and ...

2015
Eliana Costanzo Salomon Yves Cohen Alexandra Miere Giuseppe Querques Vittorio Capuano Oudy Semoun Ala'a El Ameen Hassiba Oubraham Eric H. Souied

Purpose. To analyze optical coherence tomography angiography (OCTA) findings in eyes with central serous chorioretinopathy (CSC) and to compare them with those obtained with multimodal imaging. Methods. A series of consecutive patients diagnosed with CSC, underwent OCTA and multimodal imaging, including spectral domain OCT, fluorescein, and indocyanine green angiography. OCTA images were perfor...

Journal: :Ophthalmic surgery, lasers & imaging retina 2014
Mariana R Thorell Qinqin Zhang Yanping Huang Lin An Mary K Durbin Michal Laron Utkarsh Sharma Paul F Stetson Giovanni Gregori Ruikang K Wang Philip J Rosenfeld

BACKGROUND AND OBJECTIVE To evaluate the central macular microvascular network in patients with macular telangiectasia type 2 (MacTel2) using optical coherence tomography (OCT)-based microangiography (OMAG). PATIENTS AND METHODS Prospective, observational study of patients with MacTel2 evaluated using a swept-source OCT (SS-OCT) prototype. OMAG was performed using a 3 mm × 3 mm central foveal...

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