Inclusion Criteria:

• Hereditary retinal degeneration of the outer retinal layers with the retinal vessels still being perfused and pigments of mild to moderate density
• Blindness (at least monocular) or visual functions not appropriate for navigation/orientation
• Period of appropriate visual functions > 12 years / lifetime
• Visual acuity ≥ 0,05 in earlier life
• Electrically Evoked Phosphenes provide evidence of inner-retinal function.
• willing and able to give written informed consent

Exclusion Criteria:

• Any other ophthalmologic disease with relevant effect upon visual function (e.g. glaucoma, optic neuropathy, trauma, diabetic retinopathy, retinal detachment)
• Systemic disease that might imply considerable risk with regard to the surgical intervention and anesthesia (e.g. cardiovascular diseases, severe metabolic diseases)
• Neurological and/or psychiatric diseases (e.g. M. Parkinson, epilepsy, depression )
• Retina detected as too thin (< 100 µm) to expect required rest-functionality as shown via Optical Coherence Tomography (OCT).
• Women who are pregnant or nursing, or women of childbearing potential who are not willing to use a medically acceptable means of birth control for the duration of the study, or women unwilling to perform a pregnancy test before entering the study
• Participation in another clinical trial within the past 30 days