Intended for use in Jesuit schools, Aguilon’s work was primarily a synthesis of classical and modern writings on optics; however, it also contained the first discussion of the stereographic process (which Aguilon named), one of the earliest presentations of the red-yellow-blue color system, an original theory of binocular vision and the first published description of Aguilon’s horopter.
“The horopter is the invention, or rather discovery, of Aguilon; he coined the term and showed how important the horopter is in explaining vision with two eyes; he even demonstrated the horopter in a simple device constructed by him and pictured by Rubens. . . . The theory of Aguilon on the horopter is a large step in the right direction, calling a halt to all previous deficient theories” (Ziggelaar, François Aguilon, 115; see also 53-133).
Aguilar’s theory of binocular vision was eventually superseded (despite claims to the contrary, he apparently knew nothing about Kepler’s ideas on the retina); nevertheless his ideas had some influence on the theorists of vision from Huygens to Newton to Helmholtz.
Production of Aguilon’s book fell to the Plantin-Moretus printing house, whose controllers were sympathetic to the Jesuits in Antwerp. The illustrations and allegorical title were prepared by painter, collector, and humanist scholar Peter Paul Rubens, a friend of Balthasar Moretus and himself deeply interested in the world of books.
“The designs for the frontispiece and six vignettes reveal Rubens’ knowledge of the actual text. . . . Rubens combined successfully Aguilonius’ references to ancient mythology and allegory into a coherent programme that also includes a connection with the science of optics, for all the various elements on the frontispiece have a direct relationship with the concept of vision” (Held, Rubens and the Book  52).
Hook & Norman, The Haskell F. Norman Library of Science and Medicine (1991) no. 25.