(ĭr-ĭ-dŏt'ō-mē )

[‵ + tome, incision]

A puncture made through the iris without removing any iris tissue, done for the purpose of making a new aperture in the iris when the pupil is closed. This allows free drainage of aqueous from the anterior to posterior chamber in narrow angles, chronic angle closure glaucoma, pupillary block, and aqueous misdirection syndrome

SYN: iritomy; irotomy.