Subretinal implants is a device which is implanted between the pigment epithelial layer and the outer layer of the retina. Many microelectrodes are placed onto a very thin plate which is then inserted under the retina. Light which falls on the retina activates a current resulting in a stimulation of sensory neurons from the retina. The information is sent directly then to the optic nerve exactly like a normal eye. This subretinal implant directly mimics the natural function of the retina, thus making this procedure better than the epiretinal implant. With the subretinal implant, the eye can function normally without any wires hanging around.
Subretinal implants have a promising future because they can fix the problem with the most efficency and ease.
http://www.opticsreport.com/content/article.php?article_id=1007
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