I have ordered many pairs from Zenni Optical over the years. I have always been pleased with their glasses. I did order from other online retailers a few times and the glasses were never right. Most recently, my RX changed and it took about one day for my eyes to adjust to my Zenni glasses. Zenni makes the glasses correctly, I only had problems when two optometrists in my area did the examinations incorrectly. I ordered glasses each time and they were not right. On the third exam try, the RX was correct. I had to pay for three exams. Ye... read full review »