Redditor's Eye
The term you use when somebody sees every tiny thing in an image and has extremely good eyesight, such as an Ifunny watermark, or mematic water mark.
Person 1: I see a bird , its about 10 miles away, so you may not see it.
Person 2: Oh, so you have a redditor's eye.
Person 2: Oh, so you have a redditor's eye.