Ad99999 07 018a/eng
Das Gesichts-Organ, erläutert durch das menschliche Auge
Beschreibungstext eng
Misc. Subj. CXLIII. Vol. VII. No. 16., THE ORGAN OF SIGHT ILLUSTRATED BY THE HUMAN EYE., This print exlnbits the whole structure of thè human eye, wbereof we see with us only the exterior part, as it were the window. Hère we behold very much magrnfied and in profile the exterior and anterior parts of this admirable structure, the more paiticular explication of which is contained in the commenta'ry. A.t présent we produce only ihe principal parts., Fig. 1. The Eye-hoïes or orbits of the eye, wherein the eyes are placed, over which are the eye-brovvs (Fig. . il.) together with the eye- lids (Fig. . 5.) tbat serve as a defence tö the eye. The eye itself is an oblong globe, composed of several membranes, which închuîe mQiiy humours. Behind is placed the optick nerve (Fig. . 13.) like a stalk. The exterior circumference of the eye is formed by the harcl membrane (Fig. . ifr.). To it.ç fore-aperture is adapted the transparent liomy tunicle (?\g. 20.). In the middle of the interior membrane is a hole (Fig. . 25.), calledthe Eye-ball or pupil. The most important and inmost membrane of the eye is the retina. (Fig. . 27.), the proper organ of sight., The humours contained in the Chambers of the eyes (Fig. . 32.33.) serve to.the first refraction of the incident rays, which, again refracted by the cristalline humour (Fig. . 30.) and by the vitreal one (Fig. . 29.) arrive at the retina (Fig. . 27.) upon which they cause the sensation of the object by way of vibration. The optick nerve transmits this sentiment to the brains, so that the soûl receives the idea of what we perceive.
