Morand,[8] in his “Eulogy of Cheselden,” claims to have personally seen
him operate “on an eye in which the iris was closed by an accident,”
and gives a more detailed description which closely follows the
original method. He states that Cheselden presented him with one of
his knife-needles as a souvenir of the occasion. Although Morand does
not record the exact date of his visit to London, he does state that
it occurred during the year 1729. Huguier,[9] in his exhaustive thesis
on artificial pupil, also places the date of this visit in the year
1729. This fact is important, as some writers have declared that Morand
neither made the visit to London nor saw Cheselden operate, but only
quoted the original account given in the Philosophical Transactions.
The publication of Morand’s high encomiums in 1757 attracted renewed
interest to the subject of Cheselden’s operation among men of
scientific and medical attainments.
[8] Histoire et Mémoires de l’Académie Royale de Chirurgie, Paris,
1757, iii, p. 115.
[9] Huguier, Pierre Charles: Des Opérations de Pupille Artificielle,
Paris, 1841.
Sharpe,[4] in 1739, performed this operation in the same manner as
Cheselden, except that after he had entered the knife-needle through
the sclerotic he passed it through the iris and across the anterior
chamber, and then incised the iris-membrane from before backward.
Although he was Cheselden’s pupil, and dedicated his small volume on
surgery to him, he probably did his master more harm than good, as
all the objections to Cheselden’s method seemed to be based on the
deprecatory remarks of Sharpe. He says, “I once performed it with
tolerable success, and a few months after, the very orifice I had made
contracted and brought on blindness again.” He mentions the danger
of wounding the lens, the lack of success in paralytic iris with
affection of the retina, the danger of iridodialysis from traction of
the knife, and the possibility of failure because the incision would
not enlarge sufficiently. Thirty years later (1769) he published the
ninth edition of his book without recording a single additional case,
but added the thought that, since extraction of the crystalline lens
showed the cornea was not so vulnerable as had been believed, he would
“imagine” that a larger knife might be introduced perpendicularly
through the cornea and iris and a similar incision made. In his first
eight editions he pictures Cheselden’s iris-knife (Fig. 4, vide p.
25), but in his ninth edition he substitutes a broad lance-knife with
two edges which closely resembled the one Wenzel (vide Fig. 17) had
just introduced (1767), and which Sharpe suggests “can also be used for
the extraction of the cataract.” He evidently did not have a very clear
idea of the subject, and only succeeded in casting doubt and discredit
on the method of Cheselden, which, judging by his own statement, he had
tried but once.
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