Active clinical trials for "Retinal Vein Occlusion"

Obstructive sleep apnea is a common disorder linked to serious long-term adverse health consequences; such as hypertension, metabolic dysfunction, cardiovascular disease. Retinal vascular occlusion is related to many systemic illnesses especially hypertension. Obstructive sleep apnea is also related to vascular endothelial dysfunction and vascular endothelial growth factor elevation which causes vision threatening complications of retinal vascular occlusion. Therefore the relationship between obstructive sleep apnea and retinal vascular occlusion should be studied.

The administration of short courses of topical antibiotic drops before and/or after intravitreal injections is a common practice, but increasing evidence suggests this may not lower the risk of infectious endophthalmitis and could increase rates of antimicrobial resistance. The purpose of the present study is to determine the antimicrobial resistance profiles in patients who have received numerous (≥ 20) courses of antibiotics for intravitreal injection compared with untreated controls. This study compares 20 control patients without prior intravitreal injection to 20 patients who have undergone ≥ 20 prior intravitreal injections accompanied by a course of topical antibiotics for two days before and/or after the injection procedure. The lower, inner eyelid and nasal cavity were cultured and evaluated via disk diffusion method for antimicrobial sensitivity.

The authors investigated the consecutive change of retinal vessel's diameter in affected eye and fellow eye of Branch Retinal Vein Occlusion.

To conduct a precision study to assess the microperimetry function of the Spectral OCT/SLO. The study will assess variability across measurements taken by three different operator-device configuration across clinical sites, variability between subjects within a given operator-device configuration, and variability within a subject for a single operator-device configuration.

The purpose of the study is to test if oxygen saturation in retinal vessels is correlated with clinical parameters, such as visual acuity, central retinal thickness and presence of neovascularization. Retinal oximetry is performed with fundus camera based oximeters. The study will not entail change in treatment of the disease.

This retrospective data review study will evaluate anti-VEGF injections for retinal vein occlusion (RVO) or diabetic macular edema (DME).

Ranibizumab (Lucentis, Genentech) is an off-label drug used for the clinical treatment of central retinal vein occlusion, which is one of the most common retinal vascular disorders. Despite its clinical effectiveness, concerns remain regarding the systemic effects of the drug and previous studies have noted retinal arteriolar vasoconstriction following a ranibizumab injection. We aim to provide a physiological basis to these observations by assessing retinal blood flow before and after the ranibizumab injections. Specifically, we will assess the blood flow parameters (i.e. retinal vessel diameter, velocity & flow) immediately before the first injection and post-injection over a follow-up continued treatment period.

The difficulty to measure blood flow in humans is connected with the necessity of using not invasive, reliable and reproducible techniques. There is several quantitative approaches to study eye blood flow which do not answer all these specifications. The laser doppler velocimetry allows movement speed measures but not vessel diameter. Optical coherence tomography doppler allows a simultaneous diameter and speed of travel (movement) measures, but presents a limited spatial resolution and thereby not easily reproducible vessel diameter measures. The investigators propose development of a technique allowing a simultaneous diameter and velocity measure of these vessels.

to determine the effectivness of intravitreal avastin injection on visual acuity on people that suffer from central retinal vein occlusion

The retinal vein occlusion (RVO) is the second most common retinal disease after diabetic retinopathy, and is a common cause of unilateral visual loss. The risk factors that predispose to RVO are many and are generally the same as those found in vascular alterations involving other parts of the body, as in the case of stroke or coronary heart disease. Several authors have attempted to determine whether the pathogenesis of RVO can be of arterial type, considering the disease as consequent to atherosclerosis, rather than resulting from venous disease. Although less frequent than the other diseases RVO affects considerably on health care costs. Direct medical costs showed that in one year a patient with this disease has a higher than average cost for a patient with hypertension or glaucoma. Knowing the prevalence of the disease in Italy and identify modifiable risk factors, recognizing additional risk factors related to gender, genetic predisposition and especially the social-economic and cultural background in the pathogenesis of RVO, are the objectives that led to the planning of this study. In order to assess the prevalence of the disease and the current "clinical practice" we aim to create an online register between Italian specialist centers (ophthalmic emergency care and thrombosis centers) with immediate portability and usability of the data.