Cataract extraction / by H. Herbert.

  • Herbert, H.
Date:
1908
Catalogue details

Licence: In copyright

Credit: Cataract extraction / by H. Herbert. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

    367/412 (page 355)
    Technique.—The preliminaries are the same as for division with the narrow knife. The speculum is inserted and the operator stands behind the patient's head with a Bowman's stop-needle in each hand. The globe is fixed below by the assistant. If the membrane appears dense, the needles are inserted subconjunctivally at each end of the horizontal corneal meridian, or near it. Each needle is directed parallel with the surface of the iris toward the Fig. 87.—BowxMan's Stop-Needle with Cutting Sides. middle of the dilated pupil. The one at the nasal side of the eye is inserted first, the globe being rotated outwards to allow of this. Either needle is thrust through the thinnest part of the centre of the capsule, and followed b}- the other at the same point, or quite close to it. Since the angle at which each needle meets the capsule from the limbus puncture is very acute, the point naturally does not penetrate the membrane so easily as if it had entered nearer the centre of the cornea. One needle is therefore used to fix the tissue, while the opposing point is thrust through. If any difficulty is experienced in puncturing, a small central tear may be made by separating the points caught in the tissue. The points are then separated widely by bringing the handles of the instruments together in front. The wTdth of the capsular slit thus made is tested by allowing the points to come together again. Usually they Fig. 88.—Discission with Two Needles. 23—2