“…It is well known that staring at a computer screen for too long can cause eyestrain, blurry vision, trouble focusing at a distance, dry eyes, headaches, neck, back, and shoulder pain. E-learning [3,7,11,23,26,54] applications contain the plentiful learning materials namely courses, lessons, references and exercises. As a result, learners face the problem in selecting learning materials which are suitable for their learning levels from the potentially overwhelming number of alternatives.…”