History of iridotomy : knife-needle vs. scissors - description of author's v-shaped method / by S. Lewis Ziegler.

  • S. Lewis Ziegler
Date:
1908
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Licence: In copyright

Credit: History of iridotomy : knife-needle vs. scissors - description of author's v-shaped method / by S. Lewis Ziegler. Source: Wellcome Collection.

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

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    Mackenzie,-^ in 1840, practiced Maunoir's operation with considerable success, but in certain cases found it necessary to employ a slight modification of this pro- cedure. He reversed Maunoir's incision by making the same divergent V across the radiating fibers of the iris instead of parallel with them (Fig. 22), thus securing a triangular pupil (Pig. 23), which Lawrence^ thought might succeed in some cases where Maunoir's method would not be available. Fig. 22. — Mackenzie's inci- sion in cornea and iris-mem- brane (Mackenzie). Fig. 23.—Resulting trian- gular pupil from Mackenzie's incision (Mackenzie). Bowman,-' in 1872, proposed a method which, though surgically difficult to execute, was quite ingenious, and may have l)een the initial suggestion that stimulated DeWecker to write his monograph in the following year. I will quote his description as follows: We make a double opening simultaneously on opposite sides of the cornea. It is more convenient, of course, to make these two openings in a horizontal than in a vertical direction. I then run a pair of scissors in two diverging lines (V) from each incision, thus enclosing between the incisions a large square or rhomboidal portion of the iridial region Fig 24.—rian of F i g. 25. — First Fig. 26. - Rliom- Bowman's first iris incision completed. boidal i)upil, result- incision. Divergent Plan o f second, ing from Bowman's V. showing double V. iridotom.v. including the pupil, and all the structures- there. You tlien withdraw the portion thus cut out. There is no drag on the ciliary region; whatever is withdrawn has been cut away from its connections beforehand (Figs. 24, 25 and 26). f.5 Mackenzie, William : Diseases of tlie Eye, 3rd. ed., London, 1840, p. 746, American edition, edited by Ilewson, riilladelphia, ■^^^6 Lawrence. Sir William: Diseases of the Eye, American edition, edited by Mays, rhiladelphla. 18.'-.4, p. 478. 27. Transactions, Fourth Uit-, Ophth. Cong., lH()n(^on, :8i2, p. lu,
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