 4. Have metal that would make an MRI scan unsafe such as: cardiac pacemaker, insulin infusion pump, implanted drug infusion devise, cochlear or ear implant, transdermal medication patch nitroglycerine, any metallic implants or objects, body piercing that cannot be removed, bone or joint pin, screw, nail, plate, wire sutures or surgical staples, shunts, cerebral aneurysms clips, shrapnel or other metal embedded such as from war wounds or accidents or previous work in metal fields or machines that may have left any metallic fragments in or near your eyes. 