The principles and practice of surgery: embracing minor and operative surgery : with a bibliographical index of American surgical writers from the year 1783 to 1860 : arranged for the use of students (Volume 2) . ter than a candle or lamp. Appearances of the Healthy Eye.—The interior of the healthy eye ofman is of a red or orange color, being more pink in the fair, and moreorange in the dark complexions, presenting throughout, in both, the colorof the choroidal vessels, with the branching vessels of the retina here andthere on the field. The vessels of the retina are to be seen emerging fromth
The principles and practice of surgery: embracing minor and operative surgery : with a bibliographical index of American surgical writers from the year 1783 to 1860 : arranged for the use of students (Volume 2) . ter than a candle or lamp. Appearances of the Healthy Eye.—The interior of the healthy eye ofman is of a red or orange color, being more pink in the fair, and moreorange in the dark complexions, presenting throughout, in both, the colorof the choroidal vessels, with the branching vessels of the retina here andthere on the field. The vessels of the retina are to be seen emerging fromthe entrance of the optic nerve, which is the yellow spot usually seen, thisbeing free from vessels. If the choroid is congested, the bright, blood-redcolor of the interior will be of a marked character. If the retina is dis-eased, its vessels will be enlarged and tortuous, or there may be spots ofextravasation of blood seen upon it in clots, or opaque spots of varied de-grees of extent and density. To appreciate these changes, the student mustcarefully examine, and become familiar with, the appearance of the healthyeye, and make allowance for the congestion caused by the examination. Fig. 393. Fiff. Fig. 393.—A representation of the normal condition of the retina, as shown by the Ophthalmoscope. On thecentre there is seen the papilla of the optic nerve, with the arteria and vena centralis retin»—which may bedistinguished by their color. (After Schauenberg and Von Trizt.) Fig. 394—Black spots upon the retina, probably the remains of effused blood, and resulting from injuryproduced by the iron point of a top, which perforated the iris and cornea. (After Von Trizt.) Abnormal conditions of the crystalline lens, as in commencing cataract,may also be thus readily recognized. According to Desmarres, there is noopacity of the crystalline body, however small and slight it may be, that can-not be detected by the aid of the ophthalmoscope. The importance of dis-criminating b
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