An injectable, self-opening and freestanding retinal prosthesis comprising: a curved or domed support; and a polymer-based optoelectronic interface bonded to the support, the optoelectronic interface comprising: an elastomeric substrate; and a plurality of discrete photovoltaic pixel elements disposed on top of the substrate, each pixel element facing away from the support and comprising: at least one active layer comprising a semiconducting polymer or polymer mixture, each pixel element being excitable by light to generate an electric signal via a photovoltaic process; an electrically conducting base layer disposed between the substrate and the active layer, the base layer preferably comprising at least one conducting polymer; and an electrically conducting contact layer on top of at least a portion of the active layer such that illumination of the pixel element causes a voltage to develop between the base layer and the contact layer, the contact layer being configured to provide electric contact between the pixel element and a target tissue when the retinal prosthesis is implanted. a curved or domed support; and a polymer-based optoelectronic interface bonded to the support, the optoelectronic interface comprising: an elastomeric substrate; and a plurality of discrete photovoltaic pixel elements disposed on top of the substrate, each pixel element facing away from the support and comprising: at least one active layer comprising a semiconducting polymer or polymer mixture, each pixel element being excitable by light to generate an electric signal via a photovoltaic process; an electrically conducting base layer disposed between the substrate and the active layer, the base layer preferably comprising at least one conducting polymer; and an electrically conducting contact layer on top of at least a portion of the active layer such that illumination of the pixel element causes a voltage to develop between the base layer and the contact layer, the contact layer being configured to provide electric contact between the pixel element and a target tissue when the retinal prosthesis is implanted. an elastomeric substrate; and a plurality of discrete photovoltaic pixel elements disposed on top of the substrate, each pixel element facing away from the support and comprising: at least one active layer comprising a semiconducting polymer or polymer mixture, each pixel element being excitable by light to generate an electric signal via a photovoltaic process; an electrically conducting base layer disposed between the substrate and the active layer, the base layer preferably comprising at least one conducting polymer; and an electrically conducting contact layer on top of at least a portion of the active layer such that illumination of the pixel element causes a voltage to develop between the base layer and the contact layer, the contact layer being configured to provide electric contact between the pixel element and a target tissue when the retinal prosthesis is implanted. at least one active layer comprising a semiconducting polymer or polymer mixture, each pixel element being excitable by light to generate an electric signal via a photovoltaic process; an electrically conducting base layer disposed between the substrate and the active layer, the base layer preferably comprising at least one conducting polymer; and an electrically conducting contact layer on top of at least a portion of the active layer such that illumination of the pixel element causes a voltage to develop between the base layer and the contact layer, the contact layer being configured to provide electric contact between the pixel element and a target tissue when the retinal prosthesis is implanted.