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Fractional excision of iris.

The operation of excising a part o the iris. I. is done to enlarge the pupil when the normal pupillury area is covered by an opacity or is otherwise rendered unfit for seeing (Optical i.); to diminish intra-ocular tension in glaucoma; and, in operating for cataract, to increase the space through which the lens has to pass. Hence, Iridectomise, to perform i. upon.

Excision of a slip of iris for artificial pupil.

Excision of a piece of the iris involving its entire breadth, from sphincter margin to peripheral attachment, thus forming an artificial pupil. [Lat.]