title: A light-emitting diode for use as a fixation device.
mesh_terms: D004566:Electrodes; D005403:Fixation, Ocular / Q000295:instrumentation*; D005451:Fluorescein Angiography / Q000295:instrumentation; D006068:Gonioscopy / Q000295:instrumentation; D006801:Humans; D008029:Lighting; D012666:Semiconductors