If this layer dries out, the lens starts feeling like sand. Other tests may be needed locate whether an important illness will be the cause of your dry eyes. Usually the culprit is something you have fallen into contact with recently. http://Clb.southbankcentre.com/__media__/js/netsoltrademark.php?d=Www.theralife.com%2Fdry-eyes-with-contacts%2F