Blood Flow VelocityRetinal VesselsRegional Blood FlowRetinal ArteryLaser-Doppler FlowmetryRetinal VeinCerebrovascular CirculationUltrasonography, Doppler, TranscranialBlood Circulation TimeDiabetic RetinopathyFluorescein AngiographyMiddle Cerebral ArteryDoppler EffectVision, EntopticBlood PressureHemodynamicsPulsatile FlowUltrasonography, DopplerChoroidCerebral ArteriesOphthalmic ArteryFlowmetersUltrasonography, Doppler, ColorMicrocirculationMicrospheresVascular ResistanceIntraocular PressureLight CoagulationUltrasonography, Doppler, PulsedCoronary CirculationArteriolesFourier AnalysisOxygenBlood CirculationOptic DiskVenulesHypocapniaRheologyVasodilationGanglionectomyRetinaCiliary ArteriesEchocardiography, DopplerEchoencephalographyCarbon DioxideUmbilical ArteriesDiabetes Mellitus, ExperimentalHyperventilationPolarographyHyperemiaRetinoscopesHeart RateReproducibility of ResultsInfusion Pumps, ImplantableVasodilator AgentsFlow CytometryLasersTomography, Optical CoherenceModels, CardiovascularArteriesReference ValuesDiastoleUltrasonography, PrenatalCross-Over StudiesUltrasonographyDogsAnterior Cerebral ArteryTime FactorsIntracranial PressureBrainAnalysis of VarianceHomeostasisDouble-Blind MethodXenon RadioisotopesSplanchnic CirculationHyperoxiaAcetazolamideVasoconstrictionPulmonary CirculationStreptozocinCollateral CirculationHeart Rate, FetalCapillariesSystoleSensitivity and SpecificityRenal CirculationCeliac ArteryCoronary VesselsOxygen ConsumptionGestational AgeImage Processing, Computer-AssistedPregnancyBlood VolumeMesenteric Artery, SuperiorPlacental CirculationSwineVasomotor SystemInfusions, IntravenousDiabetes Mellitus, Type 1Macaca fascicularis