Eye contact is very important as it tells the other person that you are interested in what they have to say, and that you are giving them your full attention. Eye contact can tell you if a person likes you, or if they are nervous around you. If they are nervous or do not like you, they will only look at you about 40% of the time. 60 to 70% eye contact is favorable, and indicates interest and attention.
When you are communicating your message, try to maintain a comfortable level of eye contact. This will give an impression of confidence and credibility to what you are saying. People who avoid eye contact are seen to have something to hide, having a lack of self confidence or self esteem.
If you have trouble maintaining eye contact because it makes you feel uncomfortable, you can focus on the skin between the eyebrows, just above the bridge of the nose. It will appear that you are looking directly into the person's eyes.
It is very important to maintain eye health as well. Your eyes are an important method of communication, so they should be bright, clean and healthy. Tired, yellow eyes can indicate poor circulation, liver problems or poor diet.
* source: www.eruptingmind.com