Retinal Artery OcclusionRetinal ArteryRetinal VeinOphthalmic ArterySyndromeOphthalmodynamometryArteriesCiliary ArteriesSusac SyndromeFluorescein AngiographyRetinal VesselsUltrasonography, Doppler, ColorRetinal DiseasesPulmonary ArteryFundus OculiRetinal Vein OcclusionBlood Flow VelocityCarotid ArteriesOrbitRegional Blood FlowRenal ArteryCerebral ArteriesFemoral ArteryCarotid Artery DiseasesMesenteric ArteriesCarotid Artery, InternalBlindnessBasilar ArteryAmaurosis FugaxArterial Occlusive DiseasesCarotid Artery, ExternalIntraocular PressureLaser-Doppler FlowmetryDown SyndromeMetabolic Syndrome XCoronary Artery BypassVentricular Function, LeftGanglionectomyGlaucoma, NeovascularVisual AcuityVertebral ArteryIliac ArterySneddon SyndromeEyeOptic DiskBlood PressureMammary ArteriesRadial ArterySubclavian ArteryMyographyVasodilationVentricular Dysfunction, LeftParacentesisEye DiseasesTreatment OutcomeChoroidRetinal NeuronsCoronary VesselsEisenmenger ComplexRetinaProspective StudiesSplenic ArteryBrachial ArteryOptic Neuropathy, IschemicRetrospective StudiesVasoconstrictionFollow-Up StudiesCarotid Artery, CommonMethyldopaHepatic ArteryNephrotic SyndromeEmbolismMuscle, Smooth, VascularVasodilator AgentsRisk FactorsEndothelium, VascularSjogren's SyndromeCeliac ArteryNitroarginineMesenteric Artery, SuperiorHypertrophy, Left VentricularCoronary AngiographyCarotid StenosisTime FactorsUmbilical ArteriesMiddle Cerebral ArteryOphthalmoscopyRenal Artery ObstructionAcute DiseaseThoracic ArteriesGlaucoma, Open-AngleTomography, X-Ray ComputedGlaucomaFibrinolytic AgentsTemporal ArteriesAbnormalities, MultipleMuscle RelaxationBronchial ArteriesTurner SyndromeUlnar Artery