title: Evaluation of the magnetic properties of cosmetic contact lenses with a superconducting quantum interference device.
abstract: We evaluated the magnetization of 21 cosmetic contact lens samples that included various coloring materials with a superconducting quantum interference device with regard to magnetic resonance (MR) safety. We found 7 samples were ferromagnetic; two had both ferromagnetic and diamagnetic properties; and the rest were diamagnetic. The saturated magnetization of the most ferromagnetic sample was 15.0 µJ/T, which yielded a magnetically induced displacement force of 90.0 µN when the spatial gradient of the static magnetic field was 6.0 T/m. The force was less than one-third of the gravitational force.
authors.affiliation: Graduate School of Engineering, Tokai University.
authors.forename: Kagayaki
authors.initials: K
authors.lastname: Kuroda
authors.forename: Naoki
authors.initials: N
authors.lastname: Shirakawa
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Kazuya
authors.initials: K
authors.lastname: Tawara
authors.forename: Akihiro
authors.initials: A
authors.lastname: Kobayashi
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Nakai
mesh_terms: D003261:Contact Lenses; D004553:Electric Conductivity; D004574:Electromagnetic Fields; D008279:Magnetic Resonance Imaging / Q000295:instrumentation* / Q000379:methods*; D059346:Magnets / Q000737:chemistry*; D011789:Quantum Theory