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in narrow-angle glaucoma, the surgical removal of a minute portion of the iris at its root; in intracapsular extraction of cataract, removal of one or more minute sections near the peripheral border, leaving the pupillary margin intact.
Removal of peripheral tissue from the iris.
See also: iridectomy
excision of part of the iris.
the peripheral or basal portion is removed.
a sector, from pupillary margin to base, is removed.