The Glaucoma Laser Trial (GLT) and glaucoma laser trial follow-up study: 7. Results

J. Krug*, M. Chiavelli, G. Borawski, M. Devaney, D. Epstein, F. Berson, M. Latina, S. Melamed, I. Berry, C. Evans, E. Johnson, M. Joyner, R. Kittay, A. Lindenmeyer, R. McGee, D. Piva-Bowe, T. J. Smith, K. Stout, R. Way

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


PURPOSE: To determine differences between the two treatment groups of the Glaucoma Laser Trial with respect to intraocular pressure, visual fields, optic disk cupping, and therapy for primary open-angle glaucoma. METHODS: The Glaucoma Laser Trial was a multicenter, randomized clinical trial designed to assess the efficacy and safety of starting treatment for primary open-angle glaucoma with argon laser trabeculoplasty vs starting with topical medication. The Glaucoma Laser Trial Follow-up Study was a follow-up study of 203 of the 271 patients who enrolled in the Glaucoma Laser Trial. By the close of the Glaucoma Laser Trial Follow-up Study, median duration of follow- up since diagnosis of primary open-angle glaucoma was seven years (maximum, nine years). RESULTS: Over the course of the Glaucoma Laser Trial and Glaucoma Laser Trial Follow-up Study, the eyes treated initially with argon laser trabeculoplasty had lower intraocular pressure and better visual field and optic disk status than their fellow eyes treated initially with topical medication. As compared to eyes initially treated with medication, eyes initially treated with laser trabeculoplasty had 1.2 mm Hg greater reduction in intraocular pressure (P < .001) and 0.6 dB greater improvement in the visual field (P < .001) from entry into the Glaucoma Laser Trial. The overall difference between eyes with regard to change in ratio of optic cup area to optic disk area from entry into the Glaucoma Laser Trial was -0.01 (P = .005), which indicated slightly more deterioration for eyes initially treated with medication. CONCLUSIONS: Initial treatment with argon laser trabeculoplasty was at least as efficacious as initial treatment with topical medication.

Original languageEnglish
Pages (from-to)718-731
Number of pages14
JournalAmerican Journal of Ophthalmology
Issue number6
StatePublished - 1995
Externally publishedYes


FundersFunder number
National Eye InstituteU01EY004614, EY09152


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