Seek help from Fleishman, if you wish it. It's entirely possible and reasonable that you might have to 'translate' a given passage into a more analyzable and assessable form. For instance, you might have to deal with rhetorical sentences, or with rhetoric. Every photograph is produced by means of a camera. So it was produced by means of a camera.
Every photograph is produced by a camera.
Cameras use light rays to deposit a representation of visible objects onto a surface. Therefore, the human eye is a camera and the image on the retina is a photograph. Some photographs are produced by a camera which uses light rays sent through a lens to deposit a representation of visible objects onto a surface. The image formed on the retina by the human eye is a photograph. Therefore, the image formed on the retina by the human eye is produced by a camera.