[Review of researches on retinal model]. 
Retinal model is an essential part in the retinal prosthesis.  Based on the retinal physiology and the experimental data, the model is able to simulate the information processing in the retina, and can be used to investigate the relation between the input image and the neuron firing.  We can categorize the models into circuit realization and algorithm realization.  This article is a state-of-art review of different types of retinal models.