Different types of neurons are regularly dispersed on retina. For finding the mechanism of eye and retina formation, it is important to know how this regular pattern is formed during embryonic stage. It was claimed that multiple genes regulate the development of eye and retina. These genes regulate the development of tissues and differentiation of cells in different parts of the visual system during embryo development. Also, it was found that different tissues and differentiated cells cohere with each other both temporally and spatially to form the eye.