I had New lens because of cataracts in each eye last summer. There was a two week interval between the two surgeries. I observed the color differences between each eye.. one original equipment to other the new improved version while waiting for the second upgrade . Very noticeable. I observed on target image on my Mac first through one eye then the other and created an adjustment layer that appeared to 'correct' so the images looked similar through each eye as I turned the layer on and off. I realize that is a completely bogus methodology, but it was interesting and fun. Craig Sutherland