Fig. 22.—Mackenzie’s incision in cornea and iris-membrane (Mackenzie).
Fig. 23.—Resulting triangular pupil from Mackenzie’s incision (Mackenzie).
Bowman,[28] in 1872, proposed a method which, though surgically difficult to execute, was quite ingenious, and may have been 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 including the pupil, and all the structures there. You then 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 There is no drag on the ciliary region; whatever is withdrawn has been cut away from its connections beforehand” (Figs. 24, 25 and 26).
Fig 24.—Plan of Bowman’s first iris incision. Divergent V.
Fig. 25.—First incision completed. Plan of second, showing double V.
Fig. 26.—Rhomboidal pupil, resulting from Bowman’s iridotomy.