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October 1967


Arch Ophthalmol. 1967;78(4):563. doi:10.1001/archopht.1967.00980030565024

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To the Editor.  —John M. McLean, MD, is to be complimented on his editorial "Cryosurgery in Ophthalmology" in the June 1967 issue of the Archives (77:715). The interest in cryosurgery is evidenced by the numerous reports and discussions at clinical meetings. In contrast to some writers who have magnified the dangers and difficulties of cryoextraction, Dr. McLean finds only minor objections. Two of the procedural modifications termed "drawbacks" in the editorial actually may be advantageous to the surgeon:

  1. Thus grasping the lens superiorly in cryoextraction allows this procedure to be performed under direct vision.

  2. Retracting the cornea more than usual causes less trauma than tucking the cornea against the cataract and instrument as required in the tumbling procedure. Striate keratitis rarely occurs after cryoextraction.

Admittedly the iris presents a problem particularly in round pupil cyroextractions. Iris freezing can be avoided by (1) adequate iris retraction, (2) careful placement of

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