. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. es the apex lies farther from the axis of thecornea, and indeed in different directions, butespecially inwards, whereby it may coincide aboutwith the optic nerve. Sometimes the latter issaid to be here implanted as on a second dis-tention. I have never seen this ; but thererather occurs at the base of the optic nerve, fromyielding of its external fibrous sheath, a thick-ening to 8 mm. and more, which suggests theidea of a second distention of the sclerotic (compare Fig. 146).Yon J
. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. es the apex lies farther from the axis of thecornea, and indeed in different directions, butespecially inwards, whereby it may coincide aboutwith the optic nerve. Sometimes the latter issaid to be here implanted as on a second dis-tention. I have never seen this ; but thererather occurs at the base of the optic nerve, fromyielding of its external fibrous sheath, a thick-ening to 8 mm. and more, which suggests theidea of a second distention of the sclerotic (compare Fig. 146).Yon Jaeger says he has found the apex of the enlargement even to theinside of the optic nerve. In high degrees of staphyloma posticum the eye when taken outrapidly becomes soft and flaccid; and near the posterior pole themembranes are so thin and transparent, that there the well-known * Traite pratique cles maladies des yeux. Traduit par Leveille. Paris,chez Bertrand, 1807, Tome II., p. 190. f I. <?., p 262. X Compare also Dr. Josef Bitter von Hasner, Klinische Vortriu/e iiberAuyenheilhunde, Prag, 1860, p 19. 2. 372 MYOPIA. bluish appearance occurs which is peculiar to staphyloma sclerotica?anticum. Turning the distended part to the light, we see through thepupil the fundus oculi quite clearly illuminated. Even in life, whenthe cornea is strongly turned inwards, the bluish colour of the sta-phyloma posticum is sometimes visible; and a case occurred to me,in which the whole visible sclerotic had, through general attenuation,acquired a very disagreeable uniformly blue appearance. In order now to examine the eye further, we make, either in thefresh state or after hardening in a solution of chromic acid, a sectionin a plane passing through the middle of the cornea and of theoptic nerve, taking care that it does not pass the apex of thestaphyloma. It now appears that the sclerotic has everywherebecome thinner, and indeed increasingly so towards the posteriorpole; that it is in general
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