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Study: Standardized definition of ocular hypertension needed

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A literature review found that the criteria used to define ocular hypertension have varied widely in studies published over the past 10 years. This suggests a need for a standardized definition of ocular hypertension, the authors of the review said.

Ivan M. Tavares, MD, and colleagues conducted the literature review to determine the criteria used in defining ocular hypertension in 122 studies published between 1995 and 2005.

The researchers found that the IOP cutoff level used for diagnosis of ocular hypertension ranged from 18 mm Hg to 26 mm Hg, with a mode of 22 mm Hg (49.2%).

Only 13.1% of the articles reported central corneal thickness data, the authors found.

Visual field assessment was reported in 90.2% of the studies, but only 45% explained the criteria for defining a visual field as normal or glaucomatous. Similarly, of 57 studies that used optic disc assessment, only 37 described classification criteria, according to the study authors.

The study is published in the December issue of the Journal of Glaucoma.