Ophthalmic and otic memoranda / By D.B.St. John Roosa ... and Edward T. Ely.

  • Ely, Edward T. (Edward Talbot), 1850-1885
Date:
[1885]
Catalogue details

Licence: Public Domain Mark

Credit: Ophthalmic and otic memoranda / By D.B.St. John Roosa ... and Edward T. Ely. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    of cornea, so that about half cornea is com- prised in flap. Capsule next opened by cys- totome. Then gentle pressure is made with finger or a curette against globe opposite flap, so as to tip edge of lens forward into wound through which it escapes. Graefe s modified linear extraction \Al- brecht Von Graefe, Berlin, died, 1870], it- self somewhat modified since he first proposed it, is the most common operation for hard cataract. The incision is smaller than in the flap-operation, and may be regulated by the size and hardness of the lens. The operation is usually performed somewhat as follows : The point of a narrow-bladed knife (a Graefe knife) is passed through the sclera just be- hind the edge of the cornea, and a little above its centre, carried across the anterior cham- ber and out at a corresponding point on the opposite side. The first puncture is made with the point of the knife directed down- ward toward the centre of the pupil, so that the inner lip of the wound maybe as large as possible. After completing the puncture and counter-puncture, the edge of the knife is turned obliquely upward and forward, and, by a sawing motion, made to cut its way out, emerging about at the upper sclero-corneal margin. A piece of iris is drawn out and excised. The capsule is divided by the cys- totome, preferably by a T-shaped incision or by an incision along the periphery. The lens