title: Double-mirror goniolens with dual viewing system for goniosurgery.
abstract: OBJECTIVE
  To compare the performance of the double-mirror goniolens with dual viewing system in goniosurgery, goniosynechialysis, and trabeculotomy ab externo with that of the conventional Swan-Jacob gonioprism (SJG).
  
  
  METHODS
  Prospective interventional case series.
  
  
  METHODS
  We treated 10 patients (10 eyes) with medically uncontrollable chronic angle-closure glaucoma by goniosynechialysis and another 10 eyes with open-angle glaucoma by trabeculotomy ab externo (TLO). The 20 patients were divided randomly into two equal groups and underwent operation with the double-mirror goniolens or SJG instrument.
  
  
  RESULTS
  There were no intraoperative complications, irrespective of the procedure or instrument that was used. Patients in the SJG group were required to tilt the head at a >30-degree angle to facilitate observation and manipulation of the quadrants. On the other hand, all structures could be observed and manipulated without head-tilting in the double-mirror goniolens group.
  
  
  CONCLUSIONS
  The double-mirror goniolens with dual viewing system is more suitable than the conventional SJG for goniosurgery.
authors.affiliation: Department of Ophthalmology, Kyoto Prefectural University of Medicine, Kawaramachi, Hirokoji, Kamigyoku, 602-0841 Kyoto, Japan. kmori@koto.kpu-m.ac.jp
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Mori
authors.forename: Toru
authors.initials: T
authors.lastname: Ikushima
authors.forename: Yoko
authors.initials: Y
authors.lastname: Ikeda
authors.forename: Shigeru
authors.initials: S
authors.lastname: Kinoshita
mesh_terms: D015812:Glaucoma, Angle-Closure / Q000601:surgery*; D005902:Glaucoma, Open-Angle / Q000601:surgery*; D006068:Gonioscopy / Q000295:instrumentation*; D006801:Humans; D007909:Lenses; D011446:Prospective Studies; D014129:Trabecular Meshwork / Q000601:surgery*; D014130:Trabeculectomy