Oasis TEARS Lubricant Eye Drops coat, lubricate, and moisten delicate eye tissue. With each blink, a special substance in Oasis TEARS combines with the active ingredient, glycerin, to keep tears on the eye surface for a long time. This unique combination coats and recoats the surface of the eye for continued relief of dry, irritated eyes. The top cap of the vials twist off. To place the cap back onto the vial, insert the vial tip into the base of the cap and push it into circular hole until it snaps in place. This prevents contamiation. Each vial contains about 8 drops of tear solution.