. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. incipally to the outside of theentrance of the optic nerve. The surface of the optic nerve of thenormal emmetropic eye exhibits itself as a nearly round, rather stronglyreflecting, slightly reddish plane, from which the retinal vessels setout; often an impression is to be seen on it. This plane is distinctlybounded by the commencement of the pigment of the chorioidea, tothe inside of which we sometimes observe a thin, white, stronglyreflecting line (the so-called sclerotic-boundar
. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. incipally to the outside of theentrance of the optic nerve. The surface of the optic nerve of thenormal emmetropic eye exhibits itself as a nearly round, rather stronglyreflecting, slightly reddish plane, from which the retinal vessels setout; often an impression is to be seen on it. This plane is distinctlybounded by the commencement of the pigment of the chorioidea, tothe inside of which we sometimes observe a thin, white, stronglyreflecting line (the so-called sclerotic-boundary of Liebreich), towhich the faintly-defined nerve-substance then succeeds. To thispart of the fundus oculi we usually first direct the eye. At thefirst glance we recognise in it with tolerably great certainty the M(compare Fig. 129), distinguished by a crescentic, strongly re-flecting surface (c) between the outside of the nerve (n) and theboundary of the pigment of the chorioidea. That surface is OPHTHALMOSCOPIC APPEARANCES. 355 always poor in pigment. Still it may, if it be slender, when there is Fig. normal or even diminished fulness of the vessels, be proportionatelyred, but the colour is then also brighter than that of the rest of thefundus and approaches sometimes to orange; almost always, however,it soon acquires a whiter shade, on which at first the larger chorioidealvessels, extended in a horizontal or radiating direction, are visible,often even more distinctly than on the adjoining parts of the chorio-idea abounding in pigment. Between the straightened vessels theremaining pigment of the stroma is recognisable as oblong brownish-grey little spots. The chorio-capillaris in this place now seems no-longer to carry blood. At length all blood-carrying vessels maydisappear in the atrophied place, which now appears still grey ormarbled and, finally, perfectly white, reflecting still more stronglythan the nerve-surface itself, although the latter has also increasedin w
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Keywords: ., bookcentury1800, bookdecade1860, bookidonanomalieso, bookyear1864
