Research On The Visual Fatigue Of Stereo Video Caused By Contradiction Between Convergence And Focus Adjustment

In recent years, with the development of science technology and the improvement of the social civilization, people’s reqirements for the life qulity are improving gradully, the perception of things is becoming more and more real and concrete. The technology of the stereo is highly prompted based on this demand. It can bring the users strong sense of immerse and depth, and get out of the control of parallax, even provide people with stereo display in comprehensive directions of 360°. Thus this technology is widely used in the field of military, medical, engineering, entertainment, education, data visualization and other fields, and it has already introjected throughout all aspects of people’s lives.Nowadays, the mature developed technology in stereo is the stereo technology based on binocular diparity, whose principle is to make the viewers see the left images through only left eye and right images through only right eye with image processing and other functions of auxiliary equipments, and it applies the binocular convergence to imaging the space points, so that the objects can be out of the screen or inside it, and the deep feeling of space is established. However, a problem against the objective physiological factors is caused, that is because of the contradiction of convergence and focus adjustment, the focus of viewer’s eyes is adjusted to the display screen, while the convergence is focus on the space point, then two eyes will keep adjusting and adapting, finally visual fatigue symptoms will appear such as blurred vision, dry eyes, dizziness diplopia, shame light even nausea and vomiting and so on, and may cause permanent damage to human body. As those visual fatigue symptoms are caused by the original rational defects, which meas cannot be eliminated. Nonetheless series of measures can be obtained through research, so that the visual fatigue can be reduced to the range withstand as far as possible.This paper studies the stereo technology based on binocular disparity, in the basis of understanding the technology’s development present situation and its technical principles, and analyzes the basic principles of implementation and the cause of visual fatigue symptoms. Then experiment is designed to explore the parallax distance’s effect on the stereo feeling and visual fatigue when the parallax distance is negtive, and then put forward measures to improve the visual fatigue.