Department of Ophthalmology Beijing Friendship Hospital Capital Medical University Beijing 100050 China;
Department of Ophthalmology Beijing Friendship Hospital Capital Medical University Beijing 100050 China;
Department of Ophthalmology Beijing Friendship Hospital Capital Medical University Beijing 100050 China;
internal carotid artery siphon; imageology; haemodynamics parameter; non-arteritic anterior ischaemic optic neuropathy;