2004 · 17 citations · 1 references
Life SciencesBiomedical EngineeringNeuroscienceElectrophysiologyVisual NeuroscienceVisual PerceptionAssistive Technology For Visual ImpairmentRetinal NeuroscienceRetinal Signal ProcessingVisual NeurophysiologyVisual PhysiologyVisual SystemDynamic RangeElectrical StimulationRetinal ImplantsRetinal PhysiologyRetinal ProsthesesRetinal ProstheticsRetinal StimulationVisual Prosthetics
A prototype electronic retinal prosthesis has been tested in two subjects. The system features an implanted retinal stimulator and an external system for image acquisition, processing, and telemetry. Subjects can perceive light when each of the 16 electrodes were activated. Stimulus thresholds ranged from 28 to 1417 /spl mu/A. Strength duration curves were obtained in all two subjects. Dynamic range for the brightness of the stimulus was demonstrated. Using the camera, the subjects were able to locate objects and determine the direction of movement.
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