The reason is that an RGP lens is constucted from polymeric materials and don't contain water. Humidifiers put water in the air and clear out smoke. Regions like arms, hands, lower legs, sides of abdomen, cheeks, around up your eyes are prone to dryness. http://boguchar36.ru/redirect?url=https://Www.Opticaljournal.com/sjogrens-dry-eye-dry-mouth-and-knee-joint-pain-relief-by-theralife/