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Proceedings Paper

THC:YAG laser for sclerostomy in the management of glaucoma
Author(s): Andrew G. Iwach; H. Dunbar Hoskins
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Paper Abstract

A THC:YAG (thulium, holmium, chromium-doped YAG crystal) was used to create sclerostomies in 71 glaucomatous eyes of 67 patients, for a total of 83 procedures. 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 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 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. Patients ranged in age from 9 to 90 years. Success was defined as postoperative intraocular pressure <EQ 22 mmHg, or a >= 30% reduction in intraocular pressure if preoperative pressure was <EQ 22 mmHg. One retreatment was permitted if needed in the surgeon's judgment. Success rate was 65% at 12 months and 56% at 21 months. Mean intraocular pressure of successful cases was 13.0 mmHg at 12 months. Success and failure were analyzed relative to patient risk factors.

Paper Details

Date Published: 24 June 1993
PDF: 4 pages
Proc. SPIE 1877, Ophthalmic Technologies III, (24 June 1993); doi: 10.1117/12.147534
Show Author Affiliations
Andrew G. Iwach, Foundation for Glaucoma Research (United States)
H. Dunbar Hoskins, Foundation for Glaucoma Research (United States)

Published in SPIE Proceedings Vol. 1877:
Ophthalmic Technologies III
Jean-Marie A. Parel; Qiushi Ren, Editor(s)

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