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One-piece contact lens for laser iridotomy at iris base by argon and Nd:YAG laser.

Laser iridotomies at the base of the iris provide a free shunt between the anterior and the posterior chamber remote from the capsule of the lens. Injury to the lens capsule by the Nd:YAG laser is avoided as the iris is not in close apposition. The heterocentric applanatic lens guides the laser beam under the limbal shelf toward the root of the iris. The combined use of a thermal and an ionizing laser is preferred.