I purchased an iPad 2 when it first came out, and shortly thereafter, my wife pretty much confiscated it for her own exclusive use. I find this funny as she gave me a lot of crap for spending $600 on something she was sure we didn't need. Anyhow, fast forward to present time, with me deciding to pick up an iPad 4 for my own exclusive use. Past history being what it was, I didn't want the wife using my iPad for fear she would want it (mainly due to the Retina screen). The first few weeks went fine, and then it happened, her iPad ran out of juice, and I noticed she seamlessly moved over to my iPad. Long story short, she could not tell the difference between the two screens. One would think I would be happy, but I was more incredulous and offended that she couldn't tell, to the point of me offering to pull up the same websites on both so she could see the difference. She was completely indifferent to my proposition and passed. So my question is, how common is it (or isn't it) that a person cannot tell the difference between a Retina and non-Retina iPad? In case anyone is wondering, my wife has had LASIK and has 20/20 vision.