Image from page 559 of "The principles of light and color: including among other things the harmonic laws of the universe, the etherio-atomic philosophy of force, chromo chemistry, chromo therapeutics, and the general philosophy of the fine forces, togeth
Title: The principles of light and color: including among other things the harmonic laws of the universe, the etherio-atomic philosophy of force, chromo chemistry, chromo therapeutics, and the general philosophy of the fine forces, together with numerous discoveries and practical applications ..
Year: 1878 (1870s)
Authors: Babbitt, Edwin D. (Edwin Dwight), 1828-1905
Subjects: Phototherapy Color Color
Publisher: New York, Babbitt & Co.
Contributing Library: Getty Research Institute
Digitizing Sponsor: Getty Research Institute
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is perforated by the optic nervebehind. It has grooves for the ciliary nerves, and the muscles ofthe eye-ball are inserted into it; 12, the choroid coat forms a back-ground for the retina, and being supplied with a black pigmentthere is no danger of a confused reflection of rays through theretina. The folds of the front margin of the choroid constitute theciliary processes which form a circle around the edge of the crystal-line lens behind the iris ; 13, the vitreous humor, a clear jelly likesubstance, which forms about four-fifths of the whole eye-ball.It is enclosed by the hyaloid or limiting membrane of the retina ;14, is a depression of the retina, sometimes called the yellow spotof Soemmering, or the fovea centralis, and is the point of mostdistinct vision. It will be described hereafter ; 15, is sometimescalled the punctum coecum, or blind spot of the eye, being theentrance of the optic nerve. This nerve in each eye enters onthe posterior part somewhat near the nose. 536 VISION.
Text Appearing After Image:
Fig. 198. The Iris, Ciliary Pro-cesses, etc. 3. Fig. 198 gives a transverse sectionof the front portion of the eye : I, beingthe divided edge of the sclerotic, choroidand retina; 2, the pupil; 3 the iris;4, the ciliary processes ; and 5, the scol-loped border of the retina. 4. The machinery of the eye is stillbetter seen in fig, 199, in which a con-siderable of the harder sclerotic coat iscut away so as to show the more interior choroid with its veins sweeping around in such curves andwhirls of form that they have been termed vasa vorticosa. Thisnet work of veins, forming as they do a bed upon which lies thegreat system of nerve fibres in the retina, must be attended with a play of vital ethers whichhave an animating effect uponthe retina itself. A small por-tion of the ciliary muscle isshown, together with some ofthe ciliary nerves which con-duct the vital electricity to it,and by causing it to contract,influence the shape of the crys-talline lens itself, which is amatter of immense
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