Another approach is to place the active implant under the transparent retina (sub-retinal) and combine the functions of both light detection and nerve stimulation4 within the implanted device. This later option removes the requirement to translate image information to a nerve stimulation pattern. In addition, with the sub-retinal mode, the image receiver moves with the eye so that visual capture is more natural.
The SUBRET project
The sub-retinal option for artificial retina development has been adopted by the SUBRET research consortium5 in Germany - based largely upon work undertaken at the Institute for Ophthalmic Research at the University of Tubingen. Figure 1 indicates the position of the SUBRET retinal implant at the position of the fovea and where a key design feature of the device is its thin profile.
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