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February 1997

The Incidence of Primary Angle-Closure Glaucoma in Olmsted County, Minnesota

Author Affiliations

From the Departments of Ophthalmology (Dr Erie) and Health Sciences Research (Mr Hodge and Dr Gray) and the Sections of Biostatistics (Mr Hodge) and Clinical Epidemiology (Dr Gray), Mayo Clinic and Mayo Foundation, Rochester, Minn.

Arch Ophthalmol. 1997;115(2):177-181. doi:10.1001/archopht.1997.01100150179005

Objectives:  To determine the incidence of primary angle-closure glaucoma (PACG) and to assess the visual out-comes of patients treated for PACG.

Design:  Population-based retrospective incidence study.

Setting and Patients:  Residents of Olmsted County, Minnesota, aged 40 years and older and diagnosed with PACG in the 13-year period between January 1, 1980, and December 31, 1992.

Main Outcome Measure:  Incident cases of PACG identified through the Medical Diagnostic Index of Mayo Clinic, Rochester, Minn, and the Rochester Epidemiology Project.

Results:  Thirty-six incident cases were identified. The mean annual age- and sex-adjusted incidence per 100000 people aged 40 years and older was 8.3 (95% confidence interval, 5.6-11.0). The probability of monocular blindness associated with PACG at the time of diagnosis was 14%. Among patients not monocularly blind at diagnosis, the 5-year probability of developing monocular blindness associated with PACG was 4%.

Conclusions:  Primary angle-closure glaucoma is an uncommon disease in our community. Most of the patients blinded by PACG were blind at the time the condition was diagnosed.