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Selective Laser Trabeculoplasty Reduces Intraocular Pressure Peak in Response to the Water Drinking Test

Kerr, Nathan M. MBChB, MD; Lew, Henry R. MBBS; Skalicky, Simon E. MBBS

doi: 10.1097/IJG.0000000000000512
Original Studies

Purpose: To determine the effect of selective laser trabeculoplasty (SLT) on intraocular pressure (IOP) peak and fluctuation induced by the water drinking test (WDT) in patients with open-angle glaucoma and ocular hypertension.

Methods: Patients with open-angle glaucoma or ocular hypertension underwent the WDT before and after SLT within a 12-month period. No other changes to therapeutic regimen were permitted. IOP was measured with a Goldmann applanation tonometer at baseline and every 15 minutes for 45 minutes following a fluid challenge of 800 mL over 15 minutes. Baseline, peak, and percentage fluctuation in IOP from baseline were compared using a repeated measures analysis of variance with Bonferroni adjustment.

Results: Twenty eyes from 20 patients were included in this study. The median patient age was 73±15 years (interquartile range) and 70% of patients were female. Ten eyes (50%) had a diagnosis of primary open-angle glaucoma and 10 eyes had ocular hypertension. Following SLT there was a statistically significant reduction in mean baseline IOP from 16.9±2.4 to 14.2±2.3 mm Hg (P<0.001), peak IOP from 21.9±3.7 to 16.9±3.1 mm Hg (P<0.001).

Conclusions: Patients with open-angle glaucoma and ocular hypertension treated with SLT have significantly reduced peak IOPs and fluctuation in IOP in response to the WDT.

*Royal Victorian Eye and Ear Hospital

Glaucoma Care, Melbourne

§University of Melbourne Department of Surgery, Royal Melbourne Hospital, Parkvilee, Vic.

Discipline of Ophthalmology, University of Sydney, Sydney, NSW, Australia

Disclosure: The authors declare no conflict of interest.

Reprints: Simon E. Skalicky, MBBS, Royal Victorian Eye and Ear Hospital, 32 Gisborne Street, East Melbourne, Vic. 3002, Australia (e-mail:

Received January 2, 2016

Accepted July 13, 2016

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