Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Allegorical view: a peacock and a large bird of prey form the central motif; on the sides are scenes demonstrating the transmission of images (or light) through lenses in openings in caves and mountains.
Copyright:
The National Library of Medicine believes this item to be in the public domain. (More information)
Related Title(s):
Is part of: Oculus; hoc est, Fundamentum opitcum, in quo ... radius visualis eruitur.; (DNLM)2413011R