. Kirkes' handbook of physiology . Fig. 451.—Diagram of the Blood-vessels of the Human Retina. (Leber, after Jaeger.) ans,vns, Superior nasal artery and vein; ats, vts, superior temporal artery and vein; ani, vni, inferiornasal artery and vein; ati, vti, inferior temporal artery and vein; am, vm, macular artery and vein;ane, vnie, median artery and Fig. 452.—Blood-vessels of the Macula Lutea. The part that is totally free from vessels is the fovea centralis. THE OPTICAL APPARATUS. The optical apparatus may be supposed, for the sake of description, toconsist of several parts; 1, A system
. Kirkes' handbook of physiology . Fig. 451.—Diagram of the Blood-vessels of the Human Retina. (Leber, after Jaeger.) ans,vns, Superior nasal artery and vein; ats, vts, superior temporal artery and vein; ani, vni, inferiornasal artery and vein; ati, vti, inferior temporal artery and vein; am, vm, macular artery and vein;ane, vnie, median artery and Fig. 452.—Blood-vessels of the Macula Lutea. The part that is totally free from vessels is the fovea centralis. THE OPTICAL APPARATUS. The optical apparatus may be supposed, for the sake of description, toconsist of several parts; 1, A system of transparent refracting surfaces andmedia by means of which images of external objects are brought to a focusupon the back of the eye; 2, a sensitive screen, the retina, which is a special-ized sensory apparatus in connection with the terminations of the optic nerve,and capable of being stimulated by luminous objects, and of sending suchimpressions as to produce in the brain visual sensations. To these main REFRACTIVE MEDIA AND SURFACES 039 parts may be added, 3, an apparatus for focussing light from objects at differ-ent distances from the eye; and 4, since both eyes are usually employed invision, an arrangement by means of which the eyes may be turned in thesame direction so that binocular vision is possible. The arrangement ofthe optic ner
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