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To the Editor.
—Despite methodologic problems that were carefully detailed by the authors in the December Archives (1980;98:2163-2171), their article corroborates earlier analyses of major risk factors in glaucoma. Of special interest is the large number of participants followed up for development of glaucomatous field loss during long periods. The life-table analysis shows that the annual incidence of glaucomatous field loss among participants who have an initial intraocular pressure of greater than or equal to 20 mm Hg was 7/1,000 to 17/1,000 (mean, 13.6/1,000 ± 4/1,000) during the "first" five years of follow-up. Somewhat surprisingly, there was little consistent variation during this time. Although these results may be real, they may also reflect the small number of conversions (persons in whom field loss develops) encountered, or variations in the composition of the populations that constitute the annual "at risk" groups. It would be useful to know whether these populations were
Sommer A. Risk Factors for Visual Field Loss in Glaucoma. Arch Ophthalmol. 1981;99(5):908. doi:10.1001/archopht.1981.03930010908026
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