a prosthetic vision system is provided with a lens implanted in an ocular socket to focus light onto a coherent fiberoptic bundle . the fiberoptic bundle conveys the received light to photovoltaic semiconductors mounted in a gate array . the gate array is mounted in the region of the calcarine fissure in the user &# 39 ; s cortex . the photovoltaic semiconductors stimulate the optic tract or visual cortex much in the manner done in a person having sight .