The human eye relies a lot on tears to supply lubrication and moisture so that you can maintain your vision and comfort. You might be surprised to learn that tears are a combination of quite a few elements: water, oil, mucus, antibodies and proteins. Once these essential components are gathered, the human eyes special glands begin to secrete it evenly across the eye. If there is an imbalance in your tear system, then you may begin to experience dry eye.