Optic Nerve Head Evaluation Through Multimodal Blood Flow Analysis: a Prospective Observational, Multi-center Study

Inclusion Criteria: * Participant (or parents/legal representative/tutor for minors) is willing and able to give informed consent for participation in the study * patients affected by acute ONH edema (NAION, papilledema, optic neuritis) * patients affected by acute pseudoedema (LHON) * patients affected by chronic pseudoedema (LHON, ODD) * patients affected by chronic ONH neuropathies (NTG, DOA, WS) non- affected eyes in each optic neuropathy patient Exclusion Criteria: * any other ONH disease or neurological /retinal disease impairing the evaluation of the ONH; * evidence of media opacities affecting the quality of the vascular assessment; * patients affected Alzheimer/Parkinson disease will be considered separately