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There is a great deal of variation in individual's visual acuity and that is why you will see people reporting that they can't see rainbows while others can, and some people complain about screendoor while others don't. If you have 2 people looking at a screen and one sees screendoor and the other doesn't you can be sure that person who doesn't see screendoor will not be able to tell the difference between 1080P and 720P. With good vision you will see a very noticeable difference in image detail between 1080P and 720P. This is particulary noticeable when viewing closeups of people faces on a HDTV news broacast that is being broadcast live in 1080i. The limiting issue is the video source itself. All HDTV broadcast are not created equal and as the quality of the sources improve the 1080P advantage will be clearly visible to everyone except for those with poor eyesight.