Arterial Spin Labeling MRI for Assessing Blood Perfusion in the Human Eye Repeatability Study and Clinical Application

This study uses a specialized MRI technique called Arterial Spin Labeling (ASL) to measure blood flow within the human eye, specifically in patients with optic neuropathies (diseases affecting the optic nerve). The goal is to validate this non-invasive imaging method as a reliable way to assess eye perfusion, which could improve how these conditions are diagnosed and monitored. You may be eligible if: - You are 18 years or older - You have one of the target optic neuropathies: thyroid eye disease optic neuropathy, inflammatory optic neuropathy, or ischemic optic neuropathy - You do not have cardiovascular risk factors or other eye diseases - You have no contraindications to MRI - You agree to follow the study protocol and sign informed consent You may NOT be eligible if: - You have a contraindication to MRI (such as a pacemaker, metal implants, or cochlear implant) - You have severe claustrophobia Talk to your doctor to see if this trial is right for you.