Critical closure of intraocular blood vessels.
D000818:Animals; D001775:Blood Circulation; D001808:Blood Vessels / Q000187:drug effects / Q000502:physiology*; D002415:Cats; D005123:Eye / Q000098:blood supply*; D007429:Intraocular Pressure; D009638:Norepinephrine / Q000494:pharmacology; D009880:Ophthalmic Artery; D010477:Perfusion; D011312:Pressure; D012039:Regional Blood Flow; D014655:Vascular Resistance
D009638:Norepinephrine