After a brief introduction to vision, I will describe a system designed to study how the retina processes and encodes visual images. This system can simultaneously record the extracelluar electrical activity from hundreds of retinal output neurons as a dynamic visual image is focused on the input neurons. The retinal output signals detected can be correlated with the visual input to study the neural code used by the eye to send information about the outside visual world to the brain. This system is based on techniques and expertise acquired in the development of silicon microstrip detectors for high energy physics experiments.