Original ArticlesEpidemiology of angle-closure glaucoma: Prevalence, clinical types, and association with peripheral anterior chamber depth in the Egna-Neumarkt glaucoma study☆
Section snippets
Patients and methods
The entire population 40 years of age or older of the Egna-Neumarkt area in the South Tyrol Region, including 11 rural districts, was screened. The study was conducted in the town of Egna-Neumarkt at a specially equipped screening center by appropriately trained ophthalmologists.
The study was composed of three phases. At the first screening visit a specially designed questionnaire was administered along with an ophthalmologic examination consisting of the following tests:
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autorefractometry,
Results
One thousand eight hundred eighty-two men and 2415 women were examined out of a total population of 5816, with an overall participation rate of 73.9%. The composition of the sample together with the participation rates according to sex and age have been analyzed in detail in a previous article.14 The participation rates were high for the age brackets between 40 and 79 years of age (65.4%–78.2%) and lower in more elderly subjects (38.6%), and participation was greater for women (75.8%) than for
Discussion
According to Van Herick et al’s15 classic article, anterior chamber peripheral depths corresponding to grades 2–1 and 0 of their method can be regarded as carrying a risk of occlusion. In the 26 patients with PACG, we found that the Van Herick grades 2–1 and 0 correspond, to a fair degree of approximation, to the angle width grades indicated with the same ratings according to Shaffer’s gonioscopic method. However, the Van Herick method represents only an approximation of the angular
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This study was supported in part by Regione Trentino Alto Adige and Merck Sharp & Dohme Italy.