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Graefe's Archive for Clinical and Experimental Ophthalmology
Published in: Graefe's Archive for Clinical and Experimental Ophthalmology 3/2011

01-03-2011 | Glaucoma

The effect of caffeine on intraocular pressure: a systematic review and meta-analysis

Authors: Mao Li, Min Wang, Wenyi Guo, Jiajian Wang, Xinghuai Sun

Published in: Graefe's Archive for Clinical and Experimental Ophthalmology | Issue 3/2011

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Abstract

Background

Caffeine is widely consumed, and its effect on intraocular pressure (IOP) has been reported in conflicting data. The aim of this meta-analysis was to quantitatively summarize the effect of caffeine on IOP in normal individuals and in patients with glaucoma or ocular hypertension (OHT).

Methods

A comprehensive literature search was performed using the Cochrane Collaboration methodology to identify pertinent randomized controlled trials (RCTs) from the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed and EMBASE. A systematic review and meta-analysis was performed. IOP at 0.5 hour (h), 1 h and 1.5 h after caffeine ingestion was the main outcome measurement.

Results

Six RCTs (two parallel-designed and four crossover-designed) evaluating 144 participants fulfilled inclusion criteria. The risk of bias for these studies was uncertain. Among the participants, 103 were normal individuals and 41 were patients with glaucoma or OHT. In normal individuals, the IOPs measured at 0.5 h, 1 h and 1.5 h post-intervention were not affected by ingestion of caffeine. The weighted mean difference (WMD) with 95% confidence intervals (95%CI) for each measurement point were −0.740 (–2.454, 0.974), 0.522 (–0.568, 1.613) and 0.580 (–1.524, 2.684). However, in patients with glaucoma or OHT, IOP increased at each measurement point, with the WMD and 95%CI being 0.347 (0.078, 0.616), 2.395 (1.741,3.049) and 1.998 (1.522,2.474) respectively. No publication bias was detected by either Begg’s or Egger’s test.

Conclusion

Available evidences showed that caffeine had different effects on IOP in different groups of individuals. For normal individuals, IOP was not changed by ingestion of caffeine, while for patients with glaucoma or OHT, IOP increased significantly. More high-quality RCTs are warranted to confirm this. The mechanisms underlying this phenomenon and the clinical significance are to be explored.
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Metadata
Title
The effect of caffeine on intraocular pressure: a systematic review and meta-analysis
Authors
Mao Li
Min Wang
Wenyi Guo
Jiajian Wang
Xinghuai Sun
Publication date
01-03-2011
Publisher
Springer-Verlag
Published in
Graefe's Archive for Clinical and Experimental Ophthalmology / Issue 3/2011
Print ISSN: 0721-832X
Electronic ISSN: 1435-702X
DOI
https://doi.org/10.1007/s00417-010-1455-1

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