From the former expressing, we can find the eye could transmit and express the exquisite feeling of human. Studies show that an individual tends to make eye contact with others more frequently if they approve of their idea. In general, during conversation people look at each other between 30 and 60 percent of the time. If their eye contact lasts for more than 60 percent, they are probably more interested in each other. For an instance, if they are lovers or arguers.