In one aspect, the invention provides vision prosthesis systems. Exemplary vision prosthesis systems of the invention comprise a light energy generator operably connected to a wearable head piece comprising a device for directing light energy produced by the light energy generator onto a mammalian retina, wherein the light energy generator is tuned to emit light energy of sufficient power to modulate neural activity in the retina. In another aspect, the invention provides methods for irradiating neurons in the retina of the mammalian eye by directing light energy produced by a light energy generator onto a mammalian retina. The methods of the invention may be used to directly modulate the activity of retinal neurons or to introduce molecules into retinal cells.

 
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