When your eyes lose moisture, as well as feeling uncomfortable, they can often feel itchy and irritated. Dry eyes can be uncomfortable to live with. They can be caused by a number of factors including environmental factors such as central heating and air conditioning. In addition prolonged staring at computer screens, wearing contact lenses, and certain types of medication (such as the pill, diuretics and antihistamines) can cause dry eyes. These factors can leave your eyes feeling dry and irritated. Optrex ActiMist eye spray provides instant clinically proven relief for dry eyes, in an easy spray format.