Mild/Moderate Dry Eye Soothing Comfort Sterile. Polyquad® is a safe and comfortable preservative, that s gentle enough for even sensitive eyes. Tears Naturale® II Polyquad® Lubricant Eye Drops is recommended by Doctors to help patients avoid Benzalkonium Chloride . Guaranteed to provide relief: Tears Naturale® II Polyquad® Lubricant Eye Drops is guaranteed to provide temporary relief of dry eye symptoms. Prove it to yourself at no risk. If Tears Naturale® II Polyquad® does not provide you with the relief you expect, you may return the unused portion with evidence of price paid to Alcon Laboratories, Inc., 6201 S. Freeway, Fort Worth, TX 76134, for an immediate and full refund.