<p>The combination of Polyethylene Glycol 400 &amp; Propylene Glycol is clinically proven to reduce both signs and symptoms of dry eye. The mechanism of action is thought to be due to its unique gelling and lubricating system formulated to adjust to each users individual tear pH. When the ingredients of this eye drops combine with natural tears, a soft gel forms a network of protection over the eye surface. Since it promotes a healthy environment in eye surfaces, damaged surface cells of eye can repair more easily.</p>