A treatise on the diseases of the eye . s Beers knife, [fig. 96,] is of triangular shape, straighton the back, with an oblique or slanting cutting edge, and gradually in-creasing in breadth as well as thickness, from the point to the handle. Inmy opinion it is the knife best adapted for the extraction of the is ground lancet-shaped at the point, by which means it enters the corneamore readily ; but it is blunt in the rest of the back. * Dr. F. Jaeger, of Vienna, has devised a new cornea knife, by which he proposesto obviate the inconveniences and dangers experienced in the ordinary
A treatise on the diseases of the eye . s Beers knife, [fig. 96,] is of triangular shape, straighton the back, with an oblique or slanting cutting edge, and gradually in-creasing in breadth as well as thickness, from the point to the handle. Inmy opinion it is the knife best adapted for the extraction of the is ground lancet-shaped at the point, by which means it enters the corneamore readily ; but it is blunt in the rest of the back. * Dr. F. Jaeger, of Vienna, has devised a new cornea knife, by which he proposesto obviate the inconveniences and dangers experienced in the ordinary mode of open-ing the cornea. The instrument is described and delineated by Dr. Lounoir, in aquarto pamphlet, entitled A short Inquiry into the principal Causes of the unsuccess-ful termination of Extraction by the Cornea, &c, 1826. The instrument consists of aBkbbs knife fixed to a handle, and of a smaller blade connected to the other by a but- EXTRACTION OF THE CATARACT. 637 Fig. 96. Fig. 97. Fig. 98. Fig. 99. Fig. 100. Fig. \ ton screw, so that it can be pushed forward upon it, or withdrawn. The knife is intro-duced, carried across the eye, and through the cornea on the opposite side, in the sameway as Beers. By pressing on the button with the thumb, the smaller blade is nowpushed forwards, so as to complete the section of the cornea, while the globe iskept steady by the fixed blade. From the contemplation of this double knife, Mr. Glthrie was led to constructanother of a blunt silver blade, and a lancet-shaped knife to slide along it. Hemakes an opening in the cornea with a large Wenzels knife; he then introduceshis double knife with the blunt silver blade towards the iris, and the cutting-bladeretracted ; he carries it across to the inside of the cornea, and then presses forwardsthe cutting-blade so as to complete the section of the cornea.—Lecture on the Ope-rative Surgery of the Eye, second edition, p. 344, plate 6. These instruments, which take up much room, ami
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Keywords: ., boo, bookcentury1800, bookdecade1840, booksubjecteye, bookyear1847
