If contact wearing is comfortable, that layer of moisture keeps the contacts floating just above the surface of the eye.
As a consequence it is advised to wear lenses that have less water content. http://Winepricexchange.com/__media__/js/netsoltrademark.php?d=www.Opticaljournal.com%2Fwatery-dry-eye-how-to-stop-tear-over-production%2F