. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. ared absolutely immovable, somemobility was still seen, under strong incident light, in observationwith the ophthalmometer: the paralysis was therefore not complete,and we consequently desisted from an investigation which promisedno certain result. In a second case, in a lady aged 32, there wasabsolute paralysis of the whole right oculo-motor nerve, which hadset in gradually six weeks previously, after repeated complaints ofheadache for four years, often combined with erysipelas o
. On the anomalies of accommodation and refraction of the eye, witha preliminary essay on physiological dioptrics. ared absolutely immovable, somemobility was still seen, under strong incident light, in observationwith the ophthalmometer: the paralysis was therefore not complete,and we consequently desisted from an investigation which promisedno certain result. In a second case, in a lady aged 32, there wasabsolute paralysis of the whole right oculo-motor nerve, which hadset in gradually six weeks previously, after repeated complaints ofheadache for four years, often combined with erysipelas of the righthalf of the face; in this instance the strongest incident light on oneor both eyes gave no appearance of contraction on this side. TheCalabar employed (the extract), however, produced contraction,as strong as usual, as the subjoined figure (173) shows, and atthe same time somewhat increased refraction. Now, we were disap- ANTAGONISM OF ATROPIA AND CALABAR. 617 pointed in so far as this considerable contraction teaches nothingrespecting the influence of the sympathetic nerve; for evidently Fig. spasm of the sphincter muscle is at the same time in operation. Butsuch local spasm, where there is complete paralysis of the trunk ofthe oculo-motor nerve, is still an important phenomenon : in the firstplace, because it confirms the fact that the Calabar acts by directcontact; and in the second place, because this action cannot well beimagined to occur otherwise than by the intervention of a ganglionic-cell-containing centre in the eye.—Meanwhile it is, on other grounds,more than probable, that Calabar, if it does not paralyse, at leastlowers the action of the sympathetic nerve. When, in fact, by amoderate action of Calabar, the accommodation is brought at most byhalf into tonic tension, the pupil is already narrower than withintense light and strong accommodation; and this half takes placewithout the sphincter, which continues sensitive for reflex andaccommodative im
Size: 2241px × 1116px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookidonanomalieso, bookyear1864
