Diode laser transscleral cyclophotocoagulation for refractory glaucoma

Purpose: To evaluate the efficacy of contact diode laser transscleral cyclophotocoagulation using different treatment parameters. Methods: All eyes undergoing contact diode laser transscleral cyclophotocoagulation between April 1991 and September 1997 at our two institutions were enrolled. Success was defined as an intraocular pressure less than or equal to 22 mm Hg or absence of pain for poorly sighted and blind eyes. Results: Two hundred six eyes of 204 patients (Salzburg, 117 eyes; New York, 89 eyes) were enrolled. Mean patient age was 65.8 ± 18.7 years (range, 4-96 years). Mean follow-up was 9.2 ± 11.2 months (range, 3-56 months). Mean preoperative and postoperative IOPs were 42.1 ± 11.0 mm Hg (range, 24-76 mm Hg) and 17.3 ± 10.9 mm Hg (P < 0.001) and 20.3 ± 13.2 mm Hg (P <0.001) at 12 and 24 months, respectively. The number of laser applications (mean, 18.6 ± 4.2; range, 10-40) and maximal laser power (mean, 2,352 ± 408.5 mW; range, 1,500-3,000) were not associated with a lower postoperative IOP. An IOP less than or equal to 22 mm Hg was achieved in 72.7% of eyes at the mean follow-up of 9 months. Thirty-three (16.0%) eyes required at least one retreatment. Phthisis occurred in four (1.9%) eyes. Conclusion: Contact diode laser transseleral cyclophotocoagulation is useful in eyes with refractory glaucoma in which the risks of outflow surgery are deemed unacceptable.