. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. infants,both during life and in the dead body; but the rule is, that we seenothing of the kind, although atrophy at a later period makes itsappearance, and though in all probability there was an hereditary ten-dency to it. This leads us, I think, to the conclusion, that in thesecases, the resistance at the outside of the optic nerve was originallyless than in the unpredisposed eye. Now, this predisposition has beenbrought into connexion with the history of the development of the e
. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. infants,both during life and in the dead body; but the rule is, that we seenothing of the kind, although atrophy at a later period makes itsappearance, and though in all probability there was an hereditary ten-dency to it. This leads us, I think, to the conclusion, that in thesecases, the resistance at the outside of the optic nerve was originallyless than in the unpredisposed eye. Now, this predisposition has beenbrought into connexion with the history of the development of the we look at the drawing given in the Archiv fur Ophthalmologic(Bd. IY. I. 39) by von Ammon, of the protu-herantia scleralis, described by him thirty-five Fig. 148. years previously, as existing at a certain periodof the fcetal eye, which is here reproduced asPig. 148, the form of staphyloma posticum isat once suggested to the mind. Yon Ammonstates, that in an early period of fcetal existencethe sclera is still open at the cerebral side; * Verhandl. der jihys. med. Gesellschaft, Bd. ix. s. liii, 1859. 25. 386 MYOPIA. that it then has the form of a cup, and is connected by an ovalopening with the anterior cerebral cell. This opening is closed by atissue proceeding from the margins, and as the eye becomes larger,the supplementary tissue forms the protuberance in question,which is, according to von Ammon, directed at first downwards,but subsequently backwards and outwards, as it is here repre-sented. Yon Ammon adds, that the different membranes closethe said opening nearly at the same time. In the first place,there is brought into connexion with this mode of developmentthe coloboma chorioidese, which as a defect of the chorioidea, pro-ceeding from the nerve-surface, extends inferiorly, whether over onlya small extent, or over the whole chorioidea, and may now uniteeven with coloboma iridis.* We have here, therefore, an ordinaryarrest of development. And as such Stellwag von Ca
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