Investigation On Animating Simulation Of Eyeball Movement Model

The health-consciousness of people becomes increasingly prominent with the development of economy and the elevating of people's living standard in our country. Human eyes, which are ranked as "window of the soul", will inevitably be widely concerned both as the main feeling organ of one's body (vision) and as a major factor which affects one's aesthetical appearance. Extraocular muscle diseases severely disturb one's vision and handsome-looking. However the correction amount of extraoclur muscle operation was mainly determined by the experience of the surgery doctors at present. This could result in some randomness, the negative influence on the accuracy of the correction amount and high requirement for the surgery doctor. The developed theories for calculating the correction amount were not complete and visible enough to be applied and popularized. In this paper a new accurate eyeball movement model was developed by improving the existing model. The visualization of it was achieved by computer 3D display technique.In order to get accurate three-dimensional data of extraocular muscles that can be used to build an acceptable static display model of the eye, the anatomic structure of the extraocular muscles was analyzed and the rough shape of the muscles had been grasped. Sequence pictures of the extraocular muscles along the coronal section of human body were acquired by means of the most advanced MRI system at present. The relationship between graphics resolution and soft tissues of human body was made clear by analyzing the principle ofMRI. A software was designed to process every picture and perform proper coordinate conversion. The three dimensional data of all the extraocular muscles and their relational Matrix (BOOL matrix) was also acquired with this software. 3D static display model of the eyeball and extraocular muscles were built up by means of Visual C++ programmer and Opengl three-dimensional graphical criterion.For the sake of animating the 3D static display model to simulate the real movement of human eyes, former eyeball movement models and microstructure and contraction mechanism of extraocular muscles were carefully studied. Then a more accurate eyeball movement model that could be applied to direct the treatment of extraocular muscle diseases was developed by introducing isometric contraction model of muscle. Numerical calculation method for the movement model was also briefly presented. Appling the results to the 3D static display model, the eyeball movement model was visualized with the aid of the double-buffer technique which was provided by Opengl.The eyeball movement model presented in this paper was calculated accurately and stably enough to provided an accurate and visual clinic aid for oculists. Therefore more accurate surgery of extraocular muscles can be expected. The Biomedical Simulation of Eyeball Movement Software (BSEMS) can be used as a visual aid for oculist-training and teaching students who majored in ophthalmology. This in return would quicken the steps of popularizing and applying the research results.Furthermore, the method of gathering organ's 3D shape data from living human body by mean of MRI and rebuilding it with computer in this paper is an important reference for those who are taking part in the undergoing "Digitized Human project" in our country.