From what I've gathered: the Human eye percieves roughly 576 megapixels. [cite] The approximate field of view of an individual human eye is 95° away from the nose, 75° downward, 60° toward the nose, and 60° upward, allowing humans to have an almost 180-degree forward-facing horizontal field of view. With eyeball rotation of about 90° (head rotation excluded, peripheral vision included), horizontal field of view is as high as 270°. About 12–15° temporal and 1.5° below the horizontal is the optic nerve or blind spot which is roughly 7.5° high and 5.5° wide. [wiki] I, personally, am capable to produce a spherical images like this  resulting in about 48 megapixel. The largest spherical panoramic image made is 320 gigapixel of the London BT Tower . I'm curious but not great at the science & math to figure out what the megapixel/peta pixel of a spherical image needs to be to match that of the human eye. Thus I reach out to the collective brilliant minds of Kolor forum.