Some disadvantages of optical eye tracking systems have increased the interest to EOG (Electrooculography) based Human\nComputer Interaction (HCI). However, text entry attempts using EOG have been slower than expected because the eyes should\nmove several times for entering a character. In order to improve the writing speed and accuracy of EOG based text entry, a new\nmethod based on the coding of eye movements has been suggested in this study. In addition, a real time EOG based HCI system\nhas developed to implement the method. In our method all characters have been encoded by single saccades in 8 directions and\ndifferent dwell time. In order to standardize dwell times and facilitate the coding process, computer assisted voice guidance was\nused. A number of experiments have been conducted to examine the effectiveness of the proposed method and system. At the\nend of the fifth trials, an experienced user was able to write at average 13.2 wpm (5 letters = 1 word) with 100% accuracy using the\ndeveloped system. The results of our experiments have shown that text entry with the eye can be done quickly and efficiently with\nthe proposed method and system.
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