Berkeley's first important published work, An Essay Towards a New Theory of Vision (1709), was an influential contribution to the psychology of vision and also developed doctrines relevant to his idealist project.
Shortly after returning to London, Berkeley composed the Theory of Vision, Vindicated and Explained, a defense of his earlier work on vision, and the Analyst, an acute and influential critique of the foundations of Newton's calculus.
Euclid and Ptolemy advanced Empedocles' emission theory of vision, where light is emitted from the eye, thus enabling sight.
Berkeley replied with The Theory of Vision, or Visual Language…Vindicated and Explained (1733).
Among his other works are A Review of Berkeley's Theory of Vision (1842) and Letters on the Philosophy of the Human Mind, 3 vol. (1855 63).
The basic ideas are essentially included in Abbe's theory of vision in a microscope first published in 1873; the subsequent illustrative experiments of this theory, notably by Albert B. Porter in 1906, are certainly simple examples of optical processing.
Such preoccupations have led to Egoyan being pigeon-holed by some critics as a rarefied, cerebral film-maker, more interested in the theory of vision than narrative or character.
In the early 20th century, Arthur Marten Skeffington, an English optometrist generally considered the founding father of behavioral optometry, developed his theory of vision and described reading and other close work as "socially compulsive" and "biologically unacceptable".
In An Essay Towards a New Theory of Vision (1709), he examined visual distance, magnitude, position, and problems of sight and touch and concluded that "the proper (or real) objects of sight" are not without the mind, though "the contrary be supposed true of tangible objects".
This is the basis of the duplicity theory of vision, which postulates that when the light stimulus is weak and the eye has been dark-adapted, it is the rods that are utilized because, under these conditions, their threshold is much lower than that of the cones.
