Our most advanced formula - REFRESH OPTIVE Mega-3. Preservative-free, low blur formula fortifies and restores the lipid layer. Its unique blend of natural oils helps prevent tear evaporation. Treats Dry Eye signs and symptoms associated with Meibomian Gland Dysfunction (MGD). Nourishes all three layers of the tear film damaged by Dry Eye for immediate, long-lasting relief. This lipid-enhanced lubricant eye drop is clinically proven to treat the signs and symptoms of Dry Eye. Mega-3 does not require shaking prior to use, unlike Retaine MGD. REFRESH OPTIVE Mega-3 Preservative-Free Lubricant Eye Drops come in sterile, single-use vials you can take with you anywhere and are safe to use as often as needed.