RETAINE HPMC Lubricant Eye Drops Is A Preservative-Free Hypromellose Ophthalmic Solution (0. 3%) That Provides Immediate Relief To Soothe Dry, Irritated Eyes By Resembling Natural Tears. Utilizing A Proprietary Airless Application System That Prevents Harmful Bacteria From Entering The Bottle And Contaminating The Solution, RETAINE HPMC Enables Delivery Of Multiple Sterile Doses To The Eye Without Preservatives That Can Be Damaging To The Sensitive Ocular Surface.