“I had used many name brand and prescription brand eye drops in the past. None worked. When I saw my optometrist he looked at a brand with "no preservatives" and lo and behold there was a small amount, an amount enough to irritate my eyes. He told me about I-Pur drops and carries them in the line of products he sells. Yes they are twice the price of over the counter, but so worth the price for the comfort and health of my eyes.”