The pupil which is largest will see objects the largest. This is evident when we look at luminous bodies, and particularly at those in the sky. When the eye comes out of darkness and suddenly looks up at these bodies, they at first appear larger and then diminish; and if you were to look at those bodies through a small opening, you would see them smaller still, because a smaller part of the pupil would exercise its function.
[Footnote: 9. buso in the Lomb. dialect is the same as buco.]
Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.