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Effect of brimonidine on anterior-chamber angle in patients with narrow angles .


Johanna Timoteo-Cervantes,
Joseph Anthony Tumbocon,
Ma. Margarita Lat-Luna

Related Institution

International Eye Institute - St. Luke's Medical Center

Publication Information

Publication Type
Publication Sub Type
Journal Article, Original
Philippine Journal of Ophthalmology
Publication Date
July-December 2011


Nine eyes with narrow angles were distributed to one of three treatment groups--single topical dose of 0.15% brimonidine tartrate, 0.5% timolol
maleate (positive control), or balanced salt solution (negative control)--in a prospective, single-masked, crossover, comparative trial. The primary outcome measure was anterior-chamber angle at baseline, and 2 and 4 hours after instillation of the treatment drug. Secondary outcome measures were pupil diameter, intraocular pressure (IOP), and anterior-chamber depth and volume. After a two-week washout period, eyes were crossed over to the other treatment modes. All baseline and posttreatment measurements were taken. Repeated analysis of variance (ANOVA) was used for statistical analysis.

Anterior-chamber angle, depth, and volume did not differ significantly for all treatment groups. Brimonidine caused a significant decrease in pupil
diameter, most notably 2 hours after instillation, from baseline of 2.36 ± 0.37 mm to 2.17 ± 0.35 mm. (p = 0.03). There was a significant decrease in IOP from baseline to hour 4 after treatment for both brimonidine (11.4 ± 2.2 to 9 ± 1.8 mm Hg, p < 0.001) and timolol (11.9 ± 2.3 to 9.4 ± 2.1 mm Hg, p = 0.003).

Brimonidine produced a miotic trend with no significant opening of the anterior-chamber angle in patients with narrow angles.


This study investigated the effect of brimonidine on the anterior-chamber angle in eyes with narrow angles using noncontact three-dimensional anterior-segment analyzer Pentacam.


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