They'd better be careful or we'll have to call in Doctor Freeman http://half-life.wikia.com/wiki/Resonance_Cascade

http://www.gizmag.com/visually-impaired-see-the-world-sound/12164/ Instead of using electric pulses that the person has to translate, sound pulses are used. I still think it'd be cool if they made a completely artificial eyeball or something like that because i seriously doubt translating signals like that is even close to the 1337nessof real eyesight.