Contributions to the physiology of vision.—Part II. On some remarkable, and hitherto unobserved, phænomena of binocular vision,—(continued)

Abstract

The first part of these researches was communicated to the Royal Society in 1838, and published in the Philosophical Transactions for that year. The second part, now presented, commences with an account of some remarkable illusions which occur when the usual relations which subsist between the magnitude of the pictures on the retinæ and the degree of inclination of the optic axes are disturbed. Under the ordinary circumstances of vision, when an object changes its distance from the observer, the magnitude of the pictures on the retinæ increases at the same time that the inclination of the optic axes becomes greater, and vice versâ, and the perceived magnitude of the object remains the same.