Impact on Daily Life of Patients Using the Subretinal Implant RETINA IMPLANT Alpha AMS

Inclusion Criteria: 1. Age 18 to 78 2. Willing and able to give written informed consent 3. Hereditary retinal degeneration of the outer retinal layer i.e. photoreceptors (rods \& cones) 4. Pseudophakia or aphakia in the eye to be implanted 5. Retinal vessels with remaining perfusion, despite pathological condition 6. Layering of inner retina in the central region present, as shown by Optical Coherence Tomography (OCT) 7. Thickness of the retina sufficient for subretinal surgery as shown by OCT 8. Inner retina still functional (proven e.g. by light perception or electrically evoked phosphenes (EEP)) 9. Blindness in both eyes, (no light perception or light perception only) 10. Visual acuity sufficient for reading normal print in earlier life, optically corrected 11. Period of appropriate visual functions at least 12 years / lifetime 12. Willing and able to perform study assessments and training during the full time period of 12 months 13. Motivation to get the best possible results through training and realistic expectations about these as assessed in screening interview Exclusion Criteria: 1. OCT shows significant retina edema and/or scar tissue within target region for implant 2. Heavy clumped pigmentation at posterior pole or on the planned route of the implantation 3. atrophy of optic nerve or ganglion cells degeneration 4. Any other ophthalmologic disease with relevant effect upon visual function (e.g. glaucoma, optic neuropathies, trauma, diabetic retinopathy, retinal detachment) 5. Deep amblyopia reported earlier in life on eye to be implanted 6. Systemic conditions that might imply considerable risks with regard to the surgical interventions and anesthesia (e.g. cardiovascular/pulmonary diseases, severe metabolic diseases) 7. Acute and severe neurological and/or psychiatric diseases 8. Hyperthyroidism or hypersensitivity to iodine 9. Hypersensitivity to fluorescent dye 10. 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 11. Participation in another interventional clinical study within the past 30 days