be seeing with both eyes. 19. Refraction of the eye. — The eye presents three re- fracting surfaces : the front of the cornea,1 the front of the lens, and the front of the vitreous ; and in the normally formed or emmetropic eye (E), with the accommodation relaxed, the principal focus (§ 11) of… … Visual angle and retinal image. Ob, object ; v, visual angle ; n, nodal point where the axial rays cross ; d, distance from n to the retina. The position of the retina in different states of refraction is shown by the three curved lines to the right, H being represented by the line nearest to, and…
Eye · Color blindness
Internet Archive · Yale University, Cushing/Whitney Medical Library · Public domain (published before 1931). Free to use for anything.
