Thank you; I have always found the story of the Virgin of Guadelupe to be fascinating. It helped convert millions.
Many millions. It is fascinating, and the image is still there. Below is a link to a youtube clip with Tonsmann describing his research and more about the eyes. It's in Spanish, but even if you don't understand the language, the video gives more visual information.
http://www.youtube.com/watch?v=9KC5oy00hk0&feature=player_embedded