VisualisierungvonRegenbogenfarben Eye tracking is becoming more and more popular and the result is its increasing usge in tremendous fields of research. Eye tracking studies allows to check the efficiency of a particular design or to check whether the users are concentrating on Content ,there by it gives a distribution of visual attention over time and how it is changing over a present stimulus. The data collected using eye tracking methods can be analysed either statistically or by using visualization techniques. The motivation for using eye tracking data in Visualization is related mainly to its completion time and accuracy. This paper is mainly concerned with the application on eye tracking on visualization and why it is important in the field of visualization .