Retinal Artery OcclusionRetinal ArteryFluorescein AngiographySneddon SyndromeOphthalmic ArteryBlindnessSusac SyndromeParacentesisRetinal VeinRetinal PerforationsOphthalmodynamometryOptic Neuropathy, IschemicVisual AcuityCiliary ArteriesFibrinolytic AgentsIntestinal PerforationFundus OculiRetinal DiseasesUltrasonography, Doppler, ColorArterial Occlusive DiseasesGlaucoma, NeovascularAmaurosis FugaxOrbitRetinal Vein OcclusionBlood Flow VelocityEsophageal PerforationRetinal Vessels