Preservative Free Artificial Tears. I-DROP® PUR GEL is highly effective at hydrating and lubricating the cornea. It provides superior and long-lasting relief for moderate to severe chronic dry eye disease. I-DROP® PUR GEL can be used in combination with lid massage and proper ocular hygiene to supplement additional lubrication. Instill one drop of I-DROP® PUR GEL in each eye 2-3 times per day, or as directed by your eye care professional.