HemodilutionHematocritPlasma SubstitutesBlood ViscosityBlood SubstitutesBlood VolumeHydroxyethyl Starch DerivativesBloodlettingOxygenHemoglobinsDextransIsotonic SolutionsMesocricetusPlasma VolumeBlood Volume DeterminationErythrocyte VolumeExchange Transfusion, Whole BloodSpecific GravityCerebrovascular CirculationMicrocirculationBlood Transfusion, AutologousBlood TransfusionHemodynamicsHemorheologyHypovolemiaBlood Loss, SurgicalCardiac OutputCardiopulmonary BypassBlood Gas AnalysisColloidsHypotension, ControlledErythrocyte TransfusionRetinal Artery OcclusionRetinal ArteryOphthalmic ArteryRetinal VeinGiant Cell ArteritisFluorescein AngiographyOphthalmodynamometry