Sight. Visual primary mechanisms

95% of people choose to learn about the environment through the eye. Vision through distinguish surrounding objects, living and non-living body movements, graphics and color signals (letters, numbers, images, etc.), Is of great importance for all kinds of activities. We know the long and hard work is required in order to engage in a blind work. Mankind has been a great experience for many thousandths collects, takes place in science, art. The whole experience will be passed on to future generations of books, writing through the eyes perceive. It is important to keep in mind, it is most of the people conducting the rat techniques (PC, TV) and the need for vision care knowledge. We need to learn the structure of the eye, blurred vision, and their prevention. The paper presents the visual relevant information.