Gislin Dagnelie, Ph.D., is an associate professor of ophthalmology at the Johns Hopkins University School of Medicine and the associate director of the Lions Vision Research and Rehabilitation Center at the Wilmer Eye Institute. His work over the last 20 years has been supported by grants from the National Institutes of Health, National Science Foundation and Foundation Fighting Blindness, among others. Dr. Dagnelie has been the principal investigator for clinical trials of the Optobionics Artificial Silicon Retina (2004-2007) and the Second Sight Argus™ II retinal implant (2007-present). In addition, he studies signals in the retina of retinal prosthesis patients and spearheads an effort to convert standard personal computers into precise tools for visual function measurement in the community and at home. Dr. Dagnelie is a native of the Netherlands, where he earned a Ph.D. in medical physics at the University of Amsterdam. In 1986, he came to the Wilmer Eye Institute for research in retinitis pigmentosa, an interest he continues to pursue.