I-DROP PUR GEL is very popular now as many people are staring at computer screens now more than ever. When you stare at a screen your blinking decreases causing the eyes to become dry. I-DROP PUR GEL is preservative free. Some preservatives can cause allergic reactions further increasing the sensation of dryness. For the ultimate dry eye relief, I-DROP PUR GEL is available at Matador Eyeworks for $24.99 + tax.