. Surgery, its principles and practice . performance the knife-needle shall cut and not drag upon the membrane. If either iritis oriridocyclitis should supervene, the treatment already described mustbe instituted. If glaucoma, evident by an increase in intraoculartension and steaminess of the cornea, should arise, myotics, eithereserin or pilocarpin (1 to 2 grains to the ounce), must be used, and ifthey fail, the tension must be reduced by an iridectomy or a sclero-tomy. If the cataract is a membranous one, or if the pupil has been closed byinflammatory deposits, the knife-needle operation can
. Surgery, its principles and practice . performance the knife-needle shall cut and not drag upon the membrane. If either iritis oriridocyclitis should supervene, the treatment already described mustbe instituted. If glaucoma, evident by an increase in intraoculartension and steaminess of the cornea, should arise, myotics, eithereserin or pilocarpin (1 to 2 grains to the ounce), must be used, and ifthey fail, the tension must be reduced by an iridectomy or a sclero-tomy. If the cataract is a membranous one, or if the pupil has been closed byinflammatory deposits, the knife-needle operation cannot be employed,and in its place some form of operation which approaches in its characteran iridectomy is necessary. The one often employed is that named byDe Wecker iritoectomy, in which a triangular knife is thrust through thecorneoscleral border and directly downward through the tense membranewhich closes the pupil. It is next withdrawn, and a pair of delicate scis-sors is introduced through the cut into the membrane in such a manner. Fig. 460.—Operation for After-cataract (after Haab). OPERATIONS ON THE EYEBALL. 875 that one blade lies behind this tissue and another one in front of it, andconverging cuts from each end of the original transverse incision are made,which meet at an apex at the bottom of the pupil. The piece of tissueincluded between these three incisions is removed with forceps, and ifsuccessful, a good triangular opening results. The operation is difficultand dangerous, and is often accompanied by loss of vitreous. Manymodifications of this operation have been designed, for which systematictreatises on ophthalmology must be consulted. Instead of using scissors,a Hays knife-needle may be employed to cut the flap, as advised andpractised by Lewis Ziegler. In place of excising the piece of capsule, theoperator may succeed by making a transverse cut through the thickenedmembrane, which, being elastic, retracts. This is an iridotomy—a namealso given to the mor
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