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July 1964

Techniques for Discission of Congenital (or Soft) Cataracts and Secondary Membranes

Author Affiliations


Arch Ophthalmol. 1964;72(1):66-67. doi:10.1001/archopht.1964.00970020068016

A satisfactory operative procedure is one designed to prevent or minimize the complications inherent to it. The following paragraphs describe procedures which help to minimize the complications in discission of congenital cataracts and secondary membranes.

The length of the discission knife blade should be as short as possible and be entirely within the anterior chamber, ie, 4-7 mm, before turning from the horizontal position to the vertical (Fig 1, A and B).

The edge of the blade has to be sharp. Discission knives do not lend themselves well for resharpening because they become too narrow and will not make sufficiently large incisions to permit the shaft to follow.

The point of the blade is preferably curved or sickle-shaped to facilitate penetration. This is particularly important with dense membranous or secondary cataracts.

The pupil should be well dilated when operating a soft cataract. No dilatation before a discission of a

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