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Proceedings Paper

Subconjunctival THC:YAG (holmium) laser thermal sclerostomy ab externo
Author(s): Andrew G. Iwach; H. Dunbar Hoskins; Michael V. Drake
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Paper Abstract

A THC:YAG laser (thulium, holmium, chromium-doped YAG crystal) was used to create thermal sclerostomies in 35 glaucomatous eyes of 33 patients. The laser is a long-pulsed (300 microsecond(s) ec), compact, self-contained, solid state laser operating in the near infrared (2.1 (mu) ). A 1 mm conjunctival stab incision was made 12 mm away from the sclerostomy site to allow entry of a specially designed 22-gauge (712 (mu) ) optic probe that delivers energy at a right angle to the long axis of the fiber. Probe insertion produced minimal disturbance of the conjunctiva. Pulse energies of 80 mJ to 120 mJ were used with a repetition rate of 5 pulses/sec. Total energy levels to produce full-thickness sclerostomies ranged from 1.4 to 7.2 J. Subconjunctival 5-fluorouracil injections were administered in 32 eyes. Success rate was 66% at 6 months and 63% at 12 months. Mean intraocular pressure of successful cases was 14 mmHg at 6 months and 13 mmHg at 12 months. Ten cases failed within the initial six months, and one additional case failed by 12 months. Success and failure were analyzed relative to patient risk factors and clinical experience with the procedure.

Paper Details

Date Published: 14 August 1992
PDF: 6 pages
Proc. SPIE 1644, Ophthalmic Technologies II, (14 August 1992); doi: 10.1117/12.137436
Show Author Affiliations
Andrew G. Iwach, Foundation for Glaucoma Research (United States)
H. Dunbar Hoskins, Foundation for Glaucoma Research (United States)
Michael V. Drake, Foundation for Glaucoma Research (United States)

Published in SPIE Proceedings Vol. 1644:
Ophthalmic Technologies II
Jean-Marie Parel, Editor(s)

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