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Aqueous Humor Dynamics in Exfoliation Syndrome
Thomas V. Johnson, BA;
Shan Fan, MD;
Carl B. Camras, MD;
Carol B. Toris, PhD
Arch Ophthalmol. 2008;126(7):914-920.
Objective To examine how aqueous humor dynamics are affected by exfoliation syndrome (XFS) with or without elevated intraocular pressure (IOP).
Methods Eighty participants were divided into 4 groups: (1) those with XFS and ocular normotension (n = 25), (2) controls with ocular normotension without XFS, age-matched to group 1 (n = 25), (3) those with XFS and ocular hypertension (n = 15), and (4) controls with ocular hypertension without XFS, age-matched to group 3 (n = 15). Following washout of glaucoma medications, assessments were made of IOP, episcleral venous pressure, aqueous flow, outflow facility, and uveoscleral outflow. Differences were analyzed by group mean comparisons and linear regression analyses.
Results Uveoscleral outflow was significantly decreased in individuals with XFS compared with age-matched controls and was independent of IOP. Patients with ocular hypertension (with or without XFS) exhibited decreased outflow facility compared with those with ocular normotension (with or without XFS). Aqueous flow was not affected by the level of IOP or the presence of XFS.
Conclusions Exfoliation syndrome in normotensive and hypertensive eyes is associated with a decrease in uveoscleral outflow, whereas in hypertensive but not normotensive eyes, it is associated with reduced outflow facility.
Author Affiliations: Department of Ophthalmology and Visual Sciences, University of Nebraska Medical Center, Omaha.
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