This is a 64x64 pixel piece of the picture at the top of this page. The same full moon high in the sky at about midnight, taken with the same camera and lens. In these pictures, the high moon is definately larger. The eye may have optics like a camera, but seeing is not like looking at pixels. We see objects , not retinal images.
All sight involves insight .
The alternative oculomotor micropsia theory is available on the Web at The Moon Illusion Explained by Don McCready. The Pschology department at University of Massachusetts, Lowell has a nice online collection of classic optical illusions . Actually seeing the first crescent moon after the new moon is important for for the Islamic calendar. The Moon-sighting page has all the details. The Moon-sighting FAQ is quirky and interesting.