I have to change my glass three times here. At first they gave me a wrong prescription and told me it would take time to adjust. I wait for three months to adjust with my eyes with terrible headaches and blurry vision. Then wen for second time. no improve. Third time another doctor see me and told me there was some mistakes in my glass, and he will not charge me anything. this time he said none of your eyes can be 100% perfect after using glass. So, take it easy. I believed him. After seven months my vision goes worse. I went to University of Iowa. They said, the glass that Pearle vision made, right eye is overcorrected and left eye is undercorrected.