Blind patients fitted with a retinal prosthesis system are able to accurately detect motion, according to a new report in the Archives of Ophthalmology. For 15 of 28 patients with blindness due to retinitis pigmentosa, the Argus II device (Second Sight Medical Products; Sylmar, California) significantly improved their ability to identify the direction of a high-contrast moving bar on a computer screen.To see more details visit, www.medscape.com