Intraocular apparatus is provided that is shaped and sized to be implanted entirely in a subject's eye and configured for use with an extraocular imaging device. The intraocular apparatus includes an energy receiver configured to receive energy from outside the eye and to power the intraocular apparatus； a data receiver configured to receive image data from the extraocular imaging device； circuitry configured to process the data received by the data receiver into an image； an electronic display configured to emit light representing the image； and an eye-tracking sensor configured to sense a position of the subject's eye and to generate a signal in response thereto, the electronic display being configured to emit light representing a portion of the image corresponding to the position of the subject's eye sensed by the eye-tracking sensor. Other embodiments are also described.
