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Arch Ophthalmol. 2006;124:1036-1037.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

Population studies of glaucoma provide information that is additive to what can be deduced from studies of persons being treated in clinical offices. For example, we learned from studies of randomly selected persons that half of those with open-angle glaucoma (OAG) have normal intraocular pressure.¹ Australian investigators identified 1700 possible OAG cases in Tasmania,² whose 500 000 inhabitants would be expected to have about 5000 cases of OAG (with OAG defined by reported criteria³). The method of case identification was systematic, but not random, selection. The Tasmanian study suggests that familial cases of glaucoma occur at an earlier age and patients are more severely affected than those with sporadic OAG.

One of the major challenges in the design and implementation of a large-scale study of OAG is the definition of OAG. Rather than use a standardized OAG definition, the Tasmanian study allowed community physicians to decide who had OAG without . . . [Full Text of this Article]

AUTHOR INFORMATION
Harry A. Quigley, MD

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