The retina is part of the central nervous system. It is one of the very few, maybe the only, part of the central nervous system from which we know its input, its function, and its output. This system offers therefore the unique opportunity to perform an input/output analysis, and to ask questions dealing with neuronal coding and the efficiency of such coding. In this system, we can really study what the neural code is the brain uses. Although we know a lot about neuronal diseases, neuronal function, action potentials and synaptic transmission, real insight in neuronal coding is largely lacking. My research team tries to elucidate the coding schemes the retina uses.