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Şişli Etfal Eğitim ve Araştırma Hastanesi 1. Göz Kliniği, İstanbul, Doç. Dr. Several research groups have different approaches for retinal prosthesis which are devices that receive environmental visual stimulus, process it and stimulate degenerated retinal area in order to produce a functionally efficient visual perception. These approaches can be classified as; epiretinal, subretinal, suprachoroidal and extraocular. In this paper, these approaches of several experienced international retinal prosthesis research groups and latest advances in their projects will be provided. Keywords : Retinitis pigmentosa, retinal implant, retinal prosthesis, electrical stimulation, epiretinal implant, subretinal implant